JPS6029850B2 - Heat exchange type contaminated air heating-combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange contaminated air heating and combustion apparatus.

BACKGROUND OF THE INVENTION Equipment necessary for drying materials fed to moving spans or the like is known in the prior art.

For example, multipart color printing presses use heated air to dry the ink applied to the paper during the printing operation.
Inks used in printing operations include solvent types such as toluene, isopropyl acetate, inpropyl alcohol, methyl ethyl ketone, and ethyl acetate. During the drying operation, these solvents are carried away as contaminants by the drying air. Obviously, devices of this type require an energy source to heat the drying air. Furthermore, contaminated air must be removed from the printing press. If this contaminated air is released into the atmosphere without further treatment, it will pollute the atmosphere. The invention provides a heat exchange contaminated air heating-combustion device which is particularly suitable for use in installations where dry air must be heated and where contaminated air must be rejected.

The device does not require a separate heat source to heat the dry air. This device uses the combustion heat of pollutants to heat the air heating medium. The device is extremely efficient in terms of the results obtained. The object of the present invention is to control the air flow sent to the incinerator so that in each dryer unit, i.e. the printing section, the air flow is reduced when little solvent evaporates, but at the lower limit of the explosion limit set. The aim is to maintain the incinerator volume at a precise level so as to maintain the set lower explosion limit and to avoid wasting fuel by handling or heating large volumes of air.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchange contaminated air heating-combustion device particularly suitable for use in installations where dry air must be heated and where contaminated air must be disposed of. I'm trying.

Another object of the present invention is to provide a heat exchange type pollutant-containing air heating and combustion device that exhausts pollutant-containing air without polluting the atmosphere.

It is a further object of the present invention to provide a heat exchange contaminated air heating-combustion device that does not require a separate energy source to heat the air for drying oil, e.g. in each color printing press section. .

Another object of the present invention is to provide a heat exchange type contaminant-containing air heating/combustion device that is extremely efficient in terms of the results obtained. Generally, in accordance with the present invention, contaminant-laden air from a printing press or the like is discharged into a combustion chamber of an incinerator that raises the air temperature to a temperature at which the contaminants burn and become harmless products, and then the air is is discharged to the atmosphere through a heat exchanger, and this heat exchanger places this air in a heat exchange relationship with the oil that circulates from the heat exchanger to the internal air heating device and back to the heat exchanger. is obtained.

This equipment has several safety measures in place to prevent damage to the actuator and minimize danger to the operator. Embodiments of the heat exchange type contaminant-containing air heating and combustion apparatus of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1, 2 and 3, the apparatus is particularly suited for use in a multicolor printing press 10 (FIG. 2) supported on a factory floor 12.

Printing machine 10, which may be a photolithographic printing machine, includes multiple parts. Of these parts there are four parts 14, 16,
There are 18 and 20. It is clear that such a nose printing machine has about nine parts or locations in which printing operations are carried out. Additionally, each of these sections may be equipped with any suitable heat exchanger (not shown), as is well known to those skilled in the art.
This provides dry air that is heated by the printer to carry away volatile solvents used in printing inks as contaminants. Such solvents are, for example, toluene, isopropyl acetate, inpropyl alcohol, methyl ethyl ketone or ethyl acetate. Each section 14 is configured to confine contaminant-laden air.
, 16, 18, 2 rivers, 22. These shields are all connected to a common return duct 24. This device includes, for example, a smoke incinerator (hereinafter simply referred to as an incinerator) 2 supported on the roof 28 of a factory housing printing equipment.
It is equipped with 6.

The incinerator 26 may be housed in a rooftop shed 30 located on the roof 28. The incinerator 26 includes a blower inlet duct 32 that receives smoke from the common return duct 24. A blower 34 , driven by a blower motor 36 , conveys contaminant-laden air through the inlet duct 32 to a directional duct section 38 .
The duct section 38 leads through four transfer sections provided with swivel vanes 42 . The transfer section 4 leads to a horizontal duct section 44. The last two parts of section 44 are connected to each inlet duct 4
The duct burner feeding sections 501 are connected by 6 and 48. 2 of section 44 connecting each inlet duct 46, 48
A low volume damper 52 is arranged between the sections.

Damper 52 is operated as described below to reduce the amount of contaminated air sent to incinerator 26 as desired. A manual damper 53 is preferably provided between the outlet of the blower 34 and the duct section 38. The incinerator 26 is equipped with two burners 54 to raise the temperature of the contaminated air to a temperature at which the contaminants burn into harmless by-products.

Each burner 54 has a maximum rating of 16,500,000 eaves tu/
It is preferable to select it so as to produce hr. Further, each burner 54 has a turndown ratio, that is, a combustion amount change ratio of 2G seal 1. When contaminant-laden air passes by burner 54,
This air enters the incineration chamber 56 of the incinerator 26. The chamber 56 is provided with walls 58 constructed of an insulating material such as refractory brick to withstand the high temperatures generated. The outer shell of wall 58 is manufactured by IJ Public Steel Corporation (Rep., Cleveland, Ohio) for a high-strength, low-alloy mesh that is highly resistant to atmospheric corrosion.
steelCorp. Republic, a registered trademark of ).
It is formed from Corten (Rep skin cCor-n). The wall 58 is provided with a skin 60 of aluminum coated steel that covers the outside of the incinerator 26. A blower 62 , driven by an electric motor 64 , pressurizes the space between the skin 60 and the incineration chamber 56 to a pressure slightly higher than the pressure present within the incinerator 26 . The outer skin 60' forming this pressurized space also provides an extremely good insulation effect. The skin 60 prevents hot air from escaping through pinholes that may be present in the welds used to secure the plates to the exterior wall. Air containing harmless creations of combustion of contaminants in the area below birch 54 passes by baffle plate 66 in chamber 56 .

This air then flows upwardly through the exhaust road or main chimney 68 which extends upwardly through the rooftop roof.
A damper device 70 is provided at the entrance of the chimney 68. The apparatus is also provided with an auxiliary chimney 72 that communicates from the top of the incineration chamber 56 to the atmosphere through the roof of the rooftop shed. Incineration chamber 56
An auxiliary chimney damper device 74 is provided between the auxiliary chimney 72 and the auxiliary chimney 72 . The common actuating member 76 is driven as described below to actuate each damper device 70, 74, and the main chimney 68 is actuated as desired.
It is designed to be bypassed. A heat exchanger 78 is positioned within the main chimney 68 so that the hot air carrying by-products and rising within the main chimney 68 is in a heat exchange relationship with the dry air that heats the oil circulating in the printing press as described below. let

Heat exchanger 78 is 4,620 to 397 gallons/min.
,00 eaves tu/hr waste heat recovery coil is formed. An inlet tube 80 directs oil into the coil, while an outlet tube 82 returns the oil to the press. FIG. 4 illustrates the heating oil circulation system of the heat exchange type contaminant-containing air heating and combustion apparatus of the present invention.

A suitable tank 86 is adapted to hold a supply of oil for use as a heating medium for heating the drying air in each section, such as section 14, of printing press 10. For the sake of simplicity, only the heating oil circulation device associated with part 14 is illustrated in detail in FIG. A transfer pump 94, which may be a rotary gear type driven by a 2-press, 120-pm electric motor, transfers heated oil from the tank 86 to 1.
This oil is drawn through a pair of gate valves 88 and 90 into a pipe 100.
It is sent out through the swinging check valve 96 and the gate valve 98.

The circulation device includes an inlet or feed line 104 and a return line 106. Pipe line 10 River joint 10
8 is connected to the return pipe 106. Feed pipe line 10
4 and a return line 106 is provided with a manual gate valve 102 which can be opened as desired to bypass portions of the printing press. Each gate valve 110
, 112 connect the tubes 82, 80 to the respective conduits 104, 106. Gate valve 114 is configured to bypass pump 94. The first gate valve 115 opens to allow the pipe 80 to
Nine valves leading to a pump 94 are connected.
The second gate valve 116 is activated when the circulation system is to be evacuated. The conduit 10 is connected to an expansion tank 118.

Each gate valve 1-20, 122 connects a level gauge 124 across the expansion tank 118. The waist valve 126 is connected to the conduit 10
4 is connected to the tank 118. A flow control valve 128 and a pressure regulator 130 connect a tank 132 containing a pressurized gas, such as nitrogen, to an expansion tank 118.
Connect to. A combined pump control and low level safety device 134 is coupled across tank 118. A pressure responsive switch 136 is connected to a source of pressurized gas by line 138.
It is adapted to open in response to a predetermined pressure drop. A length of capillary tube 142 leads from the expansion tank 118 to any suitable type of thermometer 14 well known in the art. A first probe 144 associated with tube 82 is adapted to actuate an oil high temperature limit switch 146 . tube 82
A second probe 148 , which cooperates with the temperature controller 150 , drives a temperature controller 150 . Temperature controller 150 controls the operation of each damper device 70, 74 in main chimney 68 and auxiliary chimney 72 of incinerator 26. Each vent valve 152, 154, 156 and connecting pipe 82
The line 104 to the expansion tank 118 and the vent line 158 is provided with a fitting 160 that leads to a leak-tight aerator. Cooperative safety valves 162 and 164 are provided in the tube 82 and the expansion tank 118, respectively.

Line 166 connects tube 82 to the circulator's high limit oil pressure switch 168. Gate valve 170, main circulation pump 1
72 and ball valve 174 are arranged in series within conduit 106.

Gate valve 176, auxiliary pump 178, and ball valve 180 allow the main pump system to be bypassed if the main pump system fails for any reason. Each swing check valve 18
2,184 connects the outlet of each pump 172,178 to a line 186 leading to a high limit oil pressure switch 168. This circulation device includes a bypass ring 188 consisting of a gate valve 190, a normally closed bypass valve 192, and a gate valve 193 connected in series between each of the pipes 104, 106.

Flow element 195 in conduit 106 is connected to differential pressure cell transducer 1
94, the flow rate controller 196 is actuated, the valve 192 is operated, and the normal bypass ring 188 is cut off. This oil circulation system operates with a constant oil flow rate. Therefore, if each unit of the printing press is not working or throttled, the controller 196
92 is opened to form an oil bypass and keep the oil at a constant flow rate. The air heater for each printing surface section, such as section 14, includes a coiled tube 200 through which heating oil passes to heat the drying air in this section.

A filter 202 , a gate valve 204 , a control valve 206 and a second gate valve 208 connect the upper end of the coiled tube 200 to the feed line 104 . The gate valve 210 and the swing check valve 212 return the lower end of the coiled pipe 200 to the pipe line 1.
Connect to 06. Coiled tube 2001 Cooperative probe 21
4 drives a temperature controller 216 that controls the operation of the valve 206 and adjusts the flow rate of oil to the coiled tube 200 in response to the temperature detected by the probe 214. As shown in FIG. 6, the pneumatic control system for the heat exchange contaminant air heating and combustion apparatus of the present invention includes a source line 215 carrying compressed air at a minimum of about 50 psi.

Pipe line 2 provided with filter 218 and pressure regulator 220
16 connects the source line 215 to the inlet of the differential pressure cell converter 194. Outlet line 222 connects the outlet of transducer 194 to the control inlet of flow controller 196. Phil evening 22
4. Conduit 2 with flow regulator 226 and meter 228
Pressure is sent from the three-way source conduit 215 to the inlet end of the controller 196. In response to the pressure in line 222 , controller 196 supplies pressurized air to the drive element of flow control valve 192 via line 232 and opens valve 192 in response to a predetermined change in pressure across flow element 195 . A bypass ring 188 is formed. Line 240 with filter 234, regulator 236, and gauge 238 generates inlet air pressure to temperature controller 150.

As described above, the probe 148 guides the oil to the temperature controller 15 and operates the controller 150 so that the air pressure in the outflow pipe 242 becomes a measure of the temperature of the oil. Conduit 242 is connected to actuator 244 . Actuating device 244 is lever piece 24
6 to operate the common link device 76 of each damper device 70, 74. When the temperature of the oil exceeds a predetermined value, the controller 1501 adjusts the pressure in the conduit 242 so that the damper device 70 closes and the damper device 74 opens. This pneumatic control device includes a static pressure controller 248 connected to the inlet of the conduit 240'.

The mouth 250 of the inlet duct 32 leading to the blower 34 is connected to a control end of the controller 248 . In response to this pressure, controller 248 provides outlet pressure to line 254 and actuator 2
56. Actuator 256 positions lever piece 258 to actuate crank 260 coupled to inlet vortex damper 262 of blower 34 . The duct section 38 also includes an inlet 2 that leads to an exhaust blower air flow rate switch, which will be described later.
64 are provided. As shown in FIG. 5, the air line 266 leading from the source line 215 of FIG. A solenoid operated pilot valve 260 is provided. Valve 218 by pressure gauge 270
The outlet pressure can be adjusted. regulator 280'
The mixture of burner gas and air is tested at test cock 286.
A safety valve 284 is introduced. A vent line 288 connected to the outlet of valve 284 is normally closed from the stop valve 29. A low gas pressure switch 282 is connected to the outlet of regulator 280. The blocking valve 292 is mainly connected to the valve 284 and the blocking valve 29
Connect to 6. A test cock 294 is provided between each valve 292,296. High gas pressure switch 298 is valve 2
It is connected to the exit of 96. Each modulating valve 304, 305 is connected to each other by a common linkage 306 and is driven by a medium torque actuator 3001 to the burner section 54.
Fuel is supplied to ports a and 54b. Each pressure gauge 308, 309 is connected to a burner section inlet. A solenoid operated block valve normally prevents fuel flow to valve 305. An example electrical circuit shown in FIGS. 7A and 7B can be used to control the heat exchange contaminated air heating and combustion apparatus of the present invention.

A suitable source 310 of three-phase power is contact piece IMR-2, IM
From Old-3, IMR-41, contact piece 2M Old-2 is connected to the discharge motor 36 shown as M-1 in Figure 7A.
, 2M-3, 2MR-4 connect the pressure blower mine motor 64 shown as M-2 in FIG. 7A to the source 3101.

Normally open switch contact piece 3M town-2, 3M old-3,3
MR-4 is an electric motor M that is closed and cooperates with the main oil pump 172.
-3 is connected to source 310. Each contact piece 5
MR-2,5M old-3,5MR-4 is closed so that electric motor M-5 associated with transfer pump 94 is connected to source 31. A transformer 312 connects the two phases of source 310 to the contactors of manual normally open interlocking switches IS, 2S.

Each switch IS, 2S has a control circuit conductor 314, 316
All you have to do is drive it so that it supplies power to the When setting the device for operation, close the pushbutton switch PBI and pass the winding I through the normally closed stop pushbutton switch PB2.
Activate MR. When the winding IMR is energized, the contact piece IMR
-1 is closed to form a holding circuit for the winding IM and bypass the push button switch PBI. At the same time, switch contacts IMR-2, IMR-3, and IMR-4 close to energize motor M-1. Additionally, switch contact IMR-5 in the blower flow circuit closes in response to the energization of winding LMR. Next, the normally open pushbutton switch PB3 is closed and the winding 2MR is energized via the normally closed stop pushbutton switch PB4. The switch contact piece 2MR- bypasses the push button switch PB-3 by the biasing of the winding 2MR.
By closing 1, a holding circuit is formed independently. The switch contact pieces 2M old 1 2, 2MR-3, 2MR-4 are closed to energize the electric motor M-2, thereby turning on the pressurized blower 62.
and switch contact piece 2 in the blower flow circuit.
M crotch-5 is closed. If the exhaust blower is working properly,
Air flow closes the exhaust airflow switch FSI and lights up the lamp LI to indicate that exhaust air is coming out.

Furthermore, in this case, the winding ICR used for the printing equipment in which the device is moved aside is energized. Since the auxiliary equipment itself is not part of the present invention, a detailed description thereof will be omitted. When exhaust air flow occurs, switch FS2 closes and lights lamp L2 to indicate that a flow of pressurized air is being generated. At the same time, one contact of the low gas pressure switch LOPS, shown as switch 282 in FIG. 5, is energized. If the gas pressure is above a predetermined low pressure, the switch LOPS is closed. Unless the gas pressure is above a predetermined high pressure, the gas high pressure switch HGPS, shown as switch 298 in FIG.
remains closed. Under these conditions, when switches FS1 and FS2 close, the gas pressure indicator lamp L
3 lights up. The generation of exhaust air flow and pressurized air flow creates a circulating oil flow.

Close the normally open pushbutton switch PB5, and switch 1 to the normally closed stop pushbutton switch PB6 and switch 1 in FIG.
Normally closed oil high pressure switch OHPS shown as 68
The circuit for relay winding 3MR is closed via . Winding wire 3M
R closes its own holding circuit via contact piece 3MR-1. Contact piece 3MR-1 bypasses pushbutton switch PB5. When energizing winding 3MR, lamp L4
lights up to indicate that the oil circulation pump motor is working. Due to the bias of the winding 3MR, the contact pieces 3MR-2, 3
M old-3, 3MR-4 is closed and electric motor M-3 cooperating with pump 172 is energized. Winding 3MR also closes the normally open switch contact 3Mold-5 of the oil pressure indicating circuit.
When a flow of oil is generated, an oil pressure switch OPS, shown as switch 136 in FIG. 4, closes the circuit of the closing lamp L5, indicating that a flow of oil has occurred. Main oil pump 1
If 72 does not operate for some reason, the auxiliary pump 17
8 is activated by closing switch PB7 and winding 4M
Stop R push button switch PB8 and oil high pressure switch O
The lamp L6 is turned on while being energized through the HPS to indicate that the auxiliary pump motor is energized.

Winding 4MR closes its own holding circuit via contact piece 4MR-1, contact piece 4M old-2, 4MR-3, 4MR-4
is closed to energize electric motor M-4 that cooperates with pump 178. Also, when oil circulation occurs, switch OPS closes and switches lamp L5 to switch 4MR- which cooperates with relay winding 4MR.
5, it is energized and indicates that oil pressure is being generated. Energizing lamp L5, as described above, closes the circuit to conductor 318, energizing the ignition control circuit of the device, which is surrounded by dashed lines in FIG. 7A.

Circuit 310 may be of any suitable type well known in the art capable of performing the functions described below. An example of such a circuit is manufactured by Protection Controls Inc. of Skokie, Illinois, USA, and sold under the trade name PROECTFJ.
It is commercially available as re). When circuit 3201 is powered as described above, transformer primary winding 322 is energized and powers two transformer secondary windings 324 and 326.
The cam switch CS-1 normally occupying the position shown, the normally closed relay switch 3CR-1, the resistor 328, the secondary winding 326, the bimetallic piece 330, and the bimetallic piece 33.
Switch piece 332 and relay winding 3CR are connected in series between conductors 318 and 316. Therefore, when the circuit 320' is powered, the winding 3
CR is activated. In this case, the normally open switch contact piece 3CR-1 is closed, creating a circuit that closes via the bimetallic piece 330 when the switch CS-2 is closed. At the same time, normally open switch contact pieces 3CR-2, 3CR-
3 closes The circuit of the timing motor TM is closed via the normally closed switch contact 2CR-2 which cooperates with the relay winding 2CR. When the timing electric motor TM starts to drive, the electric motor TM first moves the switch CS-1 from the position shown to another position to close the circuit of the electric motor M at the same time and closes the switch contact piece 3CR-2.
, 3CR-3, 2CR-2.

However, the switch contact piece 3CR-2 connects the holding circuit of the winding 3CR to the bimetal part 3 via the switch contact piece 3CR-2.
30 and switch piece 332. At the end of the scavenging cycle, for example, for one minute, sufficiently to clean the incinerator 26 of steam, switch CS-2 is closed from the timing motor T.
Bimetal piece 330 and switch 3CR-1, CS
-2 closes the circuit across secondary winding 326 to ensure current flow through thermostat 330.
Then the timing motor TM closes the switch CS3 and the valve 268
energizes the supply valve solenoid SI that cooperates with the pilot burner 1 to start flowing fuel to the pilot burner 1.

At the same time, power is supplied to the ignition transformer IT to drive the spark device 336 and ignite the pilot burner. When a flame occurs,
Flame detection device 338 connects winding 2CR via secondary winding 314.
close the circuit. When winding 2CR is energized, contact piece 2CR-1 of the safety verification circuit opens. When the contact piece 2CR-2 of the motor starting circuit returns to the zero position, it opens to stop the motor. At this zero position, the cam switch CSI is at No. 7A.
Contact the upper contact piece shown in the figure. When the winding 2CR is energized as described above, the contact piece 2CR-3 opens, cutting off the ignition circuit, and the contact piece 2CR-4 closes, bypassing the cam switch CR3 and energizing the solenoid S-1. Hold. Finally, contact piece 2CR-5 closes and energizes lamp L7, indicating that the pilot burner has been ignited. At the same time, control power is applied to conductor 340'. Each conductor 3
A high temperature limit switch device 342, which receives power from 14,316, connects a conductor 340 to a control input terminal of the limit switch device 342 as long as the temperature of a thermocouple 344 in the chimney is below a predetermined temperature, as shown in FIG. The circuit of relay winding 4CR is maintained as long as the high oil temperature limit switch OHTS connected between the two terminals remains closed.

The high temperature limit switch device 342 may be of any suitable type well known in the art, such as a Barber-Coleman Compa.
A model 281-L high temperature limit switch commercially available from NY) may be used. Winding 4CR closes switch contact pieces 4CR-1 and 4CR-2 when energized. Next, close the push button switch PB-9 and close the push button switch P.
Winding 5C via BIO and switch contact piece 4CR-1
Close the R circuit.

When energized, winding 5CR closes contact piece 5CR-1, forming a holding circuit that bypasses switch PB9. Furthermore, the switch contact piece 5CR-2 closes to supply power to the winding S2 of the safety shutoff valve 284 shown in FIG. Interlocking double-pole double-throw switches VS1, VS2 are provided which cooperate with the winding S2. The movable acid contact of switch VSI normally energizes the lower of the two contacts shown, energizing alarm 346 via normally closed switch contact 6CR-1. Energizing winding S2 moves movable contact switch VSI to interrupt the circuit of alarm 346 and establish a circuit for lamp L8 via switch contact 4CR-2, instructing burner operation. A normally open pushbutton switch PBII connected in series with relay winding 6CR between the lower contact piece of switch VSI and conductor 316 is actuated to energize winding 6CR and open contact piece 6CR-1, causing the alarm to energize. Stop 346 and contact piece 6
CR-2 is closed and lamp L9 is turned on to indicate a failure. This condition occurs if the alarm 346 does not automatically shut off after a certain period of time during operation of the device. Winding 7C between the upper contact piece of switch VS2 and conductor 306
A strong flame selection switch HFS is connected in series to R.

When a strong flame is desired, switch HFS is closed and winding 7CR is energized when the movable contact of switch VS2 engages the top of the fixed contact shown. In this case, a lamp LIO connected in parallel to winding 7CR lights up to indicate that a strong flame has occurred. A temperature control device 348 of any suitable type well known in the art has input terminals connected to the leads 314,316.

The thermocouple 350 located in the exhaust chimney is connected to the control device 348.
Send a control input signal to. Temperature control device 348 may be, for example, a Barber-Coleman model 533H-1 temperature controller. The Type 53-1 controller accepts the output of a standard thermocouple and provides an output signal to any suitable controller.

In this device, the output windings 352 and 35 from the control device 348
6 produces a signal adapted to drive a suitable drive, such as a Barber-Coleman 65 model intermediate controller. This intermediate control device receives a 2 to 2 ma input and provides proportional contact closure with an output relay that positions the appropriate actuator. Since the structure of this intermediate control device itself is outside the scope of the present invention, a detailed explanation will be omitted. In the illustrated embodiment of the control circuit, intermediate controller 356 includes gas valve actuator 300, which may be a Barber-Coleman intermediate torque actuator, such as that described in Barber-Coleman Manual 1321/IN-1-5. It is designed to drive.

As described in the above instructions, the intermediate torque actuator is a heavy duty reversible shaded pole.
ole) Equipped with an electric motor.

This actuator also has a built-in potentiometer. The diper arm of this potentiometer is driven by the output shaft and sends a feedback signal to intermediate controller 356. The limits of the actuator 300 are determined by the cam actuator switch. The structure of the actuating device is outside the scope of the present invention and will not be described in detail. Intermediate controller 356 and actuator 30 both receive power from conductors 341 and 316.

The relay winding 7CR, which is energized when the strong flame selection switch HFS is closed and the switch VS2 is closed, switches the normally open switch contact pieces 7CR-1 and 7CR-3 to open the closed switch contact piece 7CR-2. It is set as. Contact piece 7CR-2 normally sets actuator 300 to drive to the lower control limit. This lower control limit provides the lowest amount of gas to the burner under low flame conditions. When selecting a strong flame to energize winding 7CR, use contact piece 7CR.
-2 opens and contact pieces 7CR-1 and 7CR-3 close, applying a control output current from the control device 356 to the actuator 30 so that the actuator 300 can operate in two directions in response to the control device 30. Conductor 358 carries a feedback signal from actuator 300 to intermediate controller 356 . Temperature control device 3
Relay winding 8CR associated with 48 energizes winding 8CR under strong flame conditions and normally closed switch contact piece 8C.
It remains deenergized until R-1 is opened.

Under these conditions, winding 9CR is normally energized to open normally closed contact piece 9CR-1, causing damper actuator 360
'Close the normally open contact piece 9CR-2 that cooperates with this. Damper actuator 360 may be a Barber-Coleman actuator of the same type as actuator 300. Actuator 360 is at one limit of motion under low flame conditions and at the other limit under strong flame conditions. When actuator 360 receives power from conductors 314, 316, contact piece 9CR-
1 sets the control device 348 to be driven to the minimum level. When winding 9CR is deenergized under strong flame conditions, contact piece 9CR-1 opens and contact piece 9CR-2 closes driving control 360 to its maximum limit. A limit switch 362 is provided in the exhaust blower inflow vortex chamber and lights up the lamp LII to indicate the fully open position. FIG. 8 continues with the explosion lower limit control system which cooperates with the heat exchange type contaminant air heating and combustion apparatus of the present invention.

6 standard dryers, 1 extended dryer and 1 2
In a standard press line consisting of a sectional reprinting and drying chamber, any combination of dryers can be operated at any time.

Furthermore, very light ink fountains can be provided in any part of the printing press. Under either or both of the above two conditions, the heat exchange type contaminated air heating-combustion device of the present invention is controlled so as not to waste fuel by heating excess air in the incinerator. is desirable. The apparatus shown in FIG. 8 is provided to avoid waste of fuel due to excessive air heating when little or no solvent evaporates in one or more printing surface sections.

In FIG. 8, which shows only four of the nine dryers in a standard printing press line, each printing platen 4, 16, 18, and 20 has a cover and 22, and each dryer is equipped with a wall plate 366. Sugaro 364
is connected to a common conduit 24 by.

Also associated with each printing surface is a device 368 of a type well known in the art. Device 368 is connected to conduit 364
A sample of the air flowing through is collected and the amount of solvent in this air is measured. This type of device is Eibion. Instrument Company (AvionlnstrmmentCom)
pany) and Mine Safety Equipment. Power/f Ni (MineSa planning ty equipment
tCompany). In response to the amount of vapor in the sampled air, device 368 connects line 372.
sends a pneumatic signal to. This signal is sent to drive 374 to position arm 376 as a measure of the amount of solvent in the sampled air. The arm piece 376 is the link device 3
78 is connected to the cutting board 366, and the printing press is
If a relatively large amount of solvent is present in the air removed from the air, the baffle plate 366 opens. Conduit 24 is coupled to a static pressure control system that is responsive to the static pressure within conduit 24 and provides a pneumatic signal to drive system 382 . The drive device 382 drives the arm pieces 384 connected by the link mechanism 386 to drive the baffle plate 388 in the conduit 24 to control the volume of air sucked by the blower 34. In operation of the explosion lower limit controller illustrated in FIG. 8, the controller 380 is first set to a pressure of approximately 2n water columns at the full blower volume with the damper 388 open and all dampers 366 open.

Dryer damper 366 is then closed. In this case, each damper passes through its cooperating dryer to approximately 60 ft3/min.
cause a flow of When the dryer damper 366 is closed in this manner, the static current in the main duct is, for example, -5 inches of water since the blower is running at a constant speed. In this way, when the static pressure exceeds the set static pressure of the control device 380, air is sent to the drive device 382 or the air prime mover that cooperates with the blower damper 388, and the damper 388 is closed to reduce the static pressure.
Reduce the blower volume by returning to 2 inches of water column. When the solvent concentration in any particular unit rises to the set point of the associated controller 368, for example 40%, the controller 368 sends an air signal through its line 372 to the drive 374 or air prime mover to cause the damper 366 to Move from closed position to open position.

This action draws more air out of the dryer to maintain the set lower explosion limit. When the dryer damper 366 begins to open as described above, the static pressure in the common duct 24 drops to, for example, one liter of water, and the controller 380 causes the damper 388 to
is turned to its open position to a set point static pressure of -2n water columns, allowing the blower 34 to draw more volume from the dryer.

In this way, the air flow sent to the incinerator is controlled so that in each dryer unit, i.e., the printing section, the air flow is reduced when the solvent is hardly evaporated, but the air flow is reduced at the lower limit of the set explosion limit, i.e., the set explosion. To maintain the lower limit, the incinerator volume can be maintained at a precise level to avoid consumption of fuel by handling or heating large volumes of air. It is clear that the above static pressure value and solvent value of 10 powder per cent are merely examples and will vary depending on the equipment. The operation of the heat exchange type contaminated air heating and combustion apparatus of the present invention is clear from the foregoing description.

To operate the heat exchange type contaminated air heating and combustion apparatus of the present invention, the line switches IS and 2S are closed and power is supplied to the control circuit. Next, drive the push button switch PBI and winding IM.
Activate R and connect the exhaust blower mine motive MI to the power supply. Close the push button switch PB3 and energize the winding 2MR to start the pressure blower mine motor. If both of these blowers are operating properly, the lamps L1 and L2 will light up. Next, when the oil pump electric motor M3 is started, the lamp L6 lights up while the oil pressure is in a satisfactory state. Further, when the pilot lamp lights up, power is supplied to the ignition control circuit to light up the lamp L7, and control power is sent to the rest of this circuit. When power is supplied to this circuit, the alarm 3
46 is energized and remains in this energized state.

The recovery device normally operates under low flame conditions. When strong flame conditions are desired, switch HFS is closed and winding 7CR is energized, allowing actuator 300 to operate in both directions. At the same time, the damper actuator 360 is set to a strong flame condition. The contaminants drawn into the combustion chamber of the incinerator 26 are combusted and the resulting harmless products ascend through the chimney 68.

At the same time, the oil circulation device circulates oil from the printing surface through the heat exchange coil tube in the heat exchanger 78. Chimney 68
The harmless combustion products that rise through the process heat the oil which is then returned to each print surface. In these printing sand sections, this oil is subjected to a heat exchange relationship with the fresh incoming air to heat this air for the drying process required in each printing sand section. As mentioned above, this recovery device is equipped with various safety measures to prevent damage to equipment and injury to personnel. As is clear from the above description, each aspect of the present invention can be achieved in this manner. The invention also provides an incinerator hot oil recovery system that is particularly suitable for use in equipment where dry air must be heated and contaminated air must be rejected. This incinerator high-temperature oil recovery device discards pollutant-laden air without polluting the atmosphere. The recovery system does not require a separate energy source to heat air-dried oil in equipment that requires dry air, such as color printing presses. This recovery device is extremely efficient in terms of the results obtained. Although the present invention has been described in detail above, specific examples of the configuration of the present invention can be summarized as follows.

m. The circulation means is provided with a circulation line extending between the first heat exchanger and the second heat exchanger, and the heat exchange type contaminant-containing air heating-combustion device is provided with a heat transfer medium. Said second
a normally closed line adapted to be opened to bypass the heat exchanger of the circuit; and opening means for opening said normally closed line in response to the pressure of the heat transfer medium in said circulation line. A heat exchange type contaminant-containing air heating-combustion apparatus according to claim 1, further comprising:

[2- The circulation means includes a common feed pipe leading from the first heat exchanger to the equipment, a common return pipe leading from the equipment to the first heat exchanger, and these feed pipes. a normally closed bypass pipe connecting a return pipe and maintaining a substantially constant flow of heat transfer medium through the first heat exchanger in response to the flow of heat transfer medium through the return pipe; A heat exchange type contaminant-containing air heating-combustion apparatus according to claim 1, further comprising an opening means for opening said bypass pipe.

'3' The heat exchange type contaminant-containing air heating and combustion apparatus according to claim 1, wherein each dryer unit is provided with an adjusting means for adjusting the temperature of the dry air.

[4- The regulating means includes sensing means for sensing the temperature of the drying air in one of the dryer units, and in response to the sensing means heat transfer from the first heat exchanger to the equipment. The previous item [
3}'The heat exchange type contaminant-containing air heating-combustion device described herein. [5} The incinerator is provided with a main exhaust passage for hot uncontaminated air and an auxiliary exhaust passage for hot uncontaminated air, and the first heat exchanger is connected to the main exhaust passage. regulating means disposed within the passageway and in the circulation means for regulating the relative amounts of hot, uncontaminated air flowing through the main discharge passageway and the auxiliary discharge passageway in response to the temperature of the heat transfer medium; A heat exchange contaminant-containing air heating-combustion device according to claim 1, further comprising:

■ The incinerator has a high thermal state and a low thermal state, and the contaminant-containing heat exchange heat-combustion device is configured to transfer contamination from the equipment to the incinerator in response to the thermal state of the incinerator. A heat exchange contaminant air heating and combustion apparatus according to claim 1, further comprising means for controlling the flow of contaminant-laden air. It goes without saying that the present invention can be modified in various ways without departing from its spirit.

[Brief explanation of the drawing]

FIG. 1 is a front view of the incinerator and heat exchange part of one embodiment of the heat exchange type contaminant-containing air heating and combustion apparatus of the present invention, and FIG. 2 is a diagrammatic illustration of the apparatus part shown in FIG. 1. FIG. 3 is a plan view showing the relationship with equipment such as a printing press, and FIG. 3 is an end view of the apparatus shown in FIG. Figure 4 is a front view of the high-temperature oil heating device of the heat exchange type contaminant-containing air heating-combustion device shown in Figure 1, and Figure 5 is the air piping of the heat exchange type contaminant-containing air heating-combustion device shown in Figure 1. Part of the piping diagram, Figure 6 is the heat exchange type contaminant-containing air heating shown in Figure I.
FIG. 3 is a piping diagram of another air piping section of the combustion device. Figure 7A is a wiring diagram of a part of the control electric circuit used for the heat exchange type contaminant air heating and combustion device shown in Figure 1, and Figure 7B is the heat exchange type contaminant air heating and combustion device shown in Figure 1. FIG. 8 is a wiring diagram of the remaining control electrical circuit portions used to control the operation of the apparatus. FIG. 8 is a layout diagram of the high explosion limit control system used in the heat exchange contaminated air heating and combustion apparatus of the present invention. 14, 16, 18,
20...Printing section (equipment section using recovery device)
, 24... Return duct, 26... Incinerator, 3
2...Inlet duct, 34...Blower,
52... Damper, 54... Burner, 56.
...Incineration chamber (combustion chamber), 68...Main chimney (exhaust passage)
, 70, 74... damper device (adjusting device), 76.
... Working part, 78 ... Heat exchanger, 80
...Inflow pipe, 82...Outflow pipe, 94...
...Transfer pump, 100, 104, 106...
'Pipeline, 150...Controller, 200...
・Coil tube (heat exchanger), 248...Controller. r↓YO1 -F Sunshiro Self r↓q3 SunF m Nikkei L m E 1F Yofu A -F Possible "Fuhi"

Claims (1)

[Claims] 1. Equipped with a plurality of individual dryer units 14, 16...,
In a heat exchange contaminated air heating-combustion device for use with equipment adapted to heat dry air in each of these dryer units and to remove contaminated air from each of said dryer units, (b) an incinerator 26 for burning the pollutants in the supplied air so as to convert the pollutants into harmless by-products in the relatively uncontaminated air; (c) a first heat exchanger 78 which brings the heat transfer medium into a heat exchange relationship with the hot uncontaminated air so as to heat the heat transfer medium; (d) a plurality of second heat exchangers 200 that bring the heat transfer medium into a heat exchange relationship with dry air in each of the dryer units; (e) a common air duct 24 leading from the equipment to the incinerator; and (f) each dryer unit leading to the common air duct. (g) through these individual air ducts to draw contaminant-laden air from each of said dryer units into said common air duct and from said common air duct to said incineration; (h) each air blower 34 that is routed through each individual air duct to said common air duct in response to the level of contaminants in the air in each of said individual air ducts; (i) regulating means 380 for regulating the air flow from the common air duct to the incinerator in response to air pressure in the common air duct; , 388.