JP5644239B2 - Industrial heating system - Google Patents

Description

  The present invention relates to an industrial heating system.

  As an industrial heating system, a configuration in which heat of steam generated by a boiler is transmitted to an object is generally known (for example, see Patent Document 1). In addition, a configuration is known in which heat from a heat pump or refrigerator medium is transmitted to an object.

JP-A-6-249450

  An object of the present invention is to provide an industrial heating system with high energy efficiency.

According to an aspect of the present invention, a heating chamber in which an object is arranged, a compressor that compresses a gas supplied to the heating chamber, and a power recovery machine that recovers power from the gas discharged from the heating chamber A circulation path in which at least a part of the gas from the power recovery machine flows toward the compressor, the dehumidification system that dehumidifies the gas flowing in the circulation path , or the gas compressed by the compressor And a control device that controls a circulation rate that is circulated through the circulation path according to the state of the object in the heating chamber, and the control device is connected to the circulation path through an exhaust port. the amount of the gas discharged to the outside, and industrial heating systems, characterized that you control the amount of the gas that is newly introduced into the circulation path through the air inlet is provided.

  According to this heating system, the object can be heated by the high-temperature gas obtained along with the compression. In addition, the exhaust power from the heating chamber is recovered by a power recovery machine, and the energy efficiency is improved by circulating and using the gas.

It is the schematic which shows one Embodiment. It is the schematic which shows another embodiment. It is the schematic which shows another embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
Drawing 1 is a schematic diagram showing heating system S1 concerning one embodiment.

  As shown in FIG. 1, the heating system S <b> 1 includes a heating chamber (heating device) 12, a compressor (air compressor) 14, a power recovery machine 16, and a control device 70. If necessary, the heating system S1 may further include a dehumidification system 18. The control device 70 comprehensively controls the entire system. The configuration of the heating system S1 can be variously changed according to design requirements.

  In the present embodiment, the heating object is an industrial part or an industrial material. For example, in the heating chamber 12, at least a part of industrial parts or industrial materials is dried. Alternatively, in the heating chamber 12, at least a part of the industrial part or the industrial material is subjected to heat treatment (for example, thermosetting treatment). Sludge, paper, wood, resin, chemicals, chemicals, sand, household waste, industrial waste, crafts, craft materials, electrical parts, electrical equipment, paints, industrial clothing, machine parts, mechanical products, food, foodstuffs Various objects such as food products can be heated.

  In the present embodiment, the heating chamber 12 includes a heating chamber main body 122, an air supply path 124, and an air discharge path 126. A heating object is disposed in the heating chamber main body 122. Air from the compressor 14 flows through the air supply path 124 and enters the heating chamber body 122. The air from the heating chamber main body 122 flows through the air discharge path 126 and enters the power recovery machine 16. The heating chamber body 122 is provided with an inlet 125 fluidly connected to the air supply path 124 and an outlet 127 fluidly connected to the air discharge path 126. The number of inlets 125 and outlets 127, installation positions, shapes, and the like can be arbitrarily set.

  The heating chamber 12 has a transfer device (not shown) as necessary. In one example, the transfer device can have various forms such as a conveyor, a transport vehicle, and a transport robot. The object to be heated is put into the heating chamber 12 and taken out from the heating chamber 12 by the transfer device. Alternatively or additionally, the heating chamber 12 may include an output unit having a gate type, a swivel type, or the like for outputting an object after heating. The output part of the heated object can have a mechanism for performing a predetermined process such as a chemical process on the heated object as necessary.

  In the present embodiment, the transfer device can move the object to be heated in the heating chamber 12 as necessary. The heating chamber 12 further includes a dehydrating device (not shown) as needed, and thereby the object can be dehydrated. During the dehydration, a flocculant can be added to the object as necessary. Various forms such as a centrifugal type, a pressure type, a pressure type, and a vibration type can be applied to the dehydration depending on the object. Dehydration reduces the volume of the object. Moreover, the heating chamber 12 can further have a preheating chamber for applying heat to the object before entering the heating chamber 12 as necessary.

  In the present embodiment, the compressor 14 compresses the air supplied to the heating chamber 12. The air temperature increases with compression. Of the various compressors such as a centrifugal compressor, an axial compressor, a reciprocating compressor, and a rotary compressor, a compressor suitable for air compression is preferably applied. Power is supplied to the compressor 14. The compression ratio (pressure ratio) of the compressor 14 is appropriately set according to the specifications of the heating system S1.

  Hot air from the compressor 14 is supplied to the heating chamber 12. In the heating chamber 12, heat from the air is transmitted to the object.

  In this embodiment, in the heating chamber 12, heat from the air compressed by the compressor 14 is directly or indirectly transmitted to the object. For example, in the heating chamber 12, heated air can directly contact the object. Alternatively, another substance can be interposed between the heated air and the object in the heating chamber 12.

  In the present embodiment, the power recovery machine 16 is a turbine generator. A turbine compressor that is suitable for air flow, such as a blade type or a screw type, is preferably used. In other embodiments, the power recovery machine 16 may employ a configuration other than the turbine generator.

  The power recovery machine 16 applies the air discharged from the heating chamber 12 to the impeller, converts the energy of the air into a rotational motion, and recovers the power. The power recovered by the power recovery machine 16 can be used by the compressor 14, for example. The exhaust gas from the power recovery machine 16 is discharged to the outside through the exhaust pipe 162, or at least a part thereof is reused in the heating system S1. The exhaust pipe 162 may include a fluid drive unit such as a pump, a flow rate control unit (not shown) such as a valve, and an exhaust gas processing device such as a filter, as necessary.

  Thus, in the heating system S1 of the present embodiment, high-temperature air is obtained by compression in the compressor 14. In the present embodiment, the temperature of the air supplied to the heating chamber 12 is, for example, about 90, 100, 110, 120, 130, 140, 150, 160, 170, or 180 ° C. or higher.

  Directly heating the air supplied to the heating chamber 12 leads to a decrease in heat transfer points, which is advantageous for suppressing heat loss. Further, in the heating system S1, the use of the refrigerant can be avoided (refrigerant-free) or reduced, which is advantageous for reducing the load on the global environment. Further, in the heating system S <b> 1, energy efficiency is improved by recovering the exhaust power from the heating chamber 12 by the power recovery machine 16.

  The COP (Coefficient of Performance, coefficient of performance) calculated for the heating system S1 of the present embodiment was 3.48 (power base) and 3.13 (electric base). That is, with respect to the heating system S1, the COP in the high temperature range can be improved. Here, in the trial calculation, the air inlet temperature was 20 ° C., the inflow air temperature to the heating chamber 12 was 173 ° C., the outflow air temperature from the heating chamber 12 was 150 ° C., and the exhaust temperature from the power recovery machine 16 was 41 ° C. It was. In the trial calculation, the efficiency of the compressor 14 was 85%, and the efficiency of the power recovery machine 16 was 85%.

  In the present embodiment, the dehumidifying system 18 is installed in the air supply path 124 of the heating chamber 12 as necessary. In the present embodiment, the dehumidification system 18 has a heat pump cycle. That is, the dehumidification system 18 has a circuit that transfers heat between a plurality of objects by using a change in the state of the working fluid by a cycle including evaporation, compression, condensation, and expansion processes. A heat pump cycle generally has the advantage of being relatively energy efficient. Note that the dehumidification system 18 can use at least a part of the power recovered by the power recovery machine 16.

  Specifically, the dehumidification system 18 has a heat absorption part 181, a compression part 182, a heat radiation part 183, and an expansion part 184, which are connected via a conduit. In the heat absorption unit 181, the working fluid in the cycle absorbs the heat of the heat source outside the cycle, that is, the heat of the air flowing through the air supply path 124 (air from the compressor 14 toward the heating chamber 12). At least a portion of the moisture contained in the air deprived of heat condenses and flows through a discharge path (not shown). In the heat radiating unit 183, heat of the working fluid in the cycle is given to an object outside the cycle, that is, dehumidified air flowing through the air supply path 124 (air dehumidified by the heat absorbing unit 181 toward the heating chamber 12). Note that the liquid recovered by the dehumidification system 18 may be input to the power recovery machine 16 (such as a turbine inlet).

  In the present embodiment, the relative humidity of the air increases with compression by the compressor 14. Dehumidification by the dehumidification system 18 reduces moisture in the air. This is advantageous, for example, in improving the processing capacity when performing a drying process in the heating chamber 12.

  FIG. 2 is a schematic diagram showing a heating system S2 according to another embodiment. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In the present embodiment, the heating system S2 includes a heating chamber (heating device) 12, a compressor (air compressor) 14, a power recovery machine 16, and a control device 70, as shown in FIG. Furthermore, the heating system S <b> 2 includes a dehumidifier 188 as a dehumidifying system 18 and a circulation path (exhaust heat recovery path) 19. The control device 70 comprehensively controls the entire system. The configuration of the heating system S2 can be variously changed according to design requirements.

  In the present embodiment, the power recovery machine 16 and the compressor 14 are fluidly connected. One end of the circulation path 19 is connected to the outlet (exhaust port) 163 of the power recovery machine 16, and the other end is connected to the inlet (suction port) 142 of the compressor 14. In the vicinity of the outlet 163 of the power recovery machine 16, an exhaust port 192 through which a part of the exhaust from the power recovery machine 16 can be discharged is provided in the circulation path 19. An intake port 194 for taking in air is provided in the circulation path 19 in the vicinity of the inlet portion 142 of the compressor 14. 1, the heating chamber 12 includes a heating chamber main body 122, an air supply path 124, and an air discharge path 126. If necessary, a fluid drive unit such as a pump, a flow rate control unit (not shown) such as a valve, and a gas processing device such as a filter are provided on the pipe.

  In the present embodiment, a heating object is disposed in the heating chamber main body 122. Air from the inlet 194 enters the compressor 14. The air from the compressor 14 flows through the air supply path 124 and enters the heating chamber main body 122. In the present embodiment, the compressor 14 compresses the air supplied to the heating chamber 12. Power is supplied to the compressor 14 (power is transmitted electrically). The air temperature increases with compression. Hot air from the compressor 14 is supplied to the heating chamber 12. In the heating chamber 12, heat from the air is transmitted to the object.

  In this embodiment, in the heating chamber 12, heat from the air compressed by the compressor 14 is directly or indirectly transmitted to the object. For example, in the heating chamber 12, heated air can directly contact the object. Alternatively, another substance can be interposed between the heated air and the object in the heating chamber 12.

  The air from the heating chamber main body 122 flows through the air discharge path 126 and enters the power recovery machine 16. In the present embodiment, the power recovery machine 16 is a turbine generator. In other embodiments, the power recovery machine 16 may employ a configuration other than the turbine generator. For example, the power recovery machine 16 applies air discharged from the heating chamber 12 to the impeller and converts the energy of the air into a rotational motion to recover the power. The power recovered by the power recovery machine 16 can be used by the compressor 14, for example.

  Air (exhaust gas) from the power recovery machine 16 flows through the circulation path 19. In the present embodiment, at least a part of the fluid to be heated (heated air) can be circulated. A part of the air in the circulation path 19 can be discharged from the exhaust port 192 to the outside. Air flowing through the circulation path 19 is supplied to the compressor 14 (reused). Before being charged into the compressor 14, fresh air is charged into the circulating air. Circulating air and fresh air merge at the junction 196 of the circulation path 19. The merged air enters the compressor 14. In addition, the structure which heats (preheats) the air supplied to the compressor 14 using the heat | fever (exhaust heat) which the exhaust_gas | exhaustion from the motive power recovery machine 16 has can be employ | adopted.

  Thus, in the heating system S2 of the present embodiment, high-temperature air is obtained by compression in the compressor 14. In the present embodiment, the temperature of the air supplied to the heating chamber 12 is, for example, about 90, 100, 110, 120, 130, 140, 150, 160, 170, or 180 ° C. or higher.

  Similarly to the embodiment of FIG. 1, directly heating the air supplied to the heating chamber 12 leads to a decrease in heat transfer locations, which is advantageous for suppressing heat loss. Moreover, in heating system S2, use of a refrigerant | coolant can be avoided (refrigerant free) or can be reduced, and it is advantageous to the reduction | restoration of the load to global environment. Further, in the heating system S <b> 1, energy efficiency is improved by recovering the exhaust power from the heating chamber 12 by the power recovery machine 16.

  In the present embodiment, the compressor 14 and the power recovery machine 16 are arranged relatively close to each other. In one example, the inlet portion (suction port) 142 of the compressor 14 is disposed close to the power recovery device 16, and the outlet portion (exhaust port) 163 of the power recovery device 16 is disposed close to the compressor 14. By the close arrangement, the piping length of the circulation path 19 can be shortened (the piping space can be reduced). This is advantageous for suppressing heat loss. Further, the proximity arrangement makes it relatively easy to mechanically transmit the power recovered by the power recovery machine 16 to the compressor 14. The mechanical transmission of the recovery power is advantageous for reducing the loss. In the configuration for mechanically transmitting power, the compressor 14 and the power recovery machine 16 may be arranged coaxially or non-coaxially. The coaxial arrangement can suppress mechanical loss.

  In this embodiment, the energy efficiency is further improved by circulating and using air. The control device 70 can control the circulation rate (heat recovery rate) circulated through the circulation path 19. In one example, a device (such as an open / close controller, a flow rate controller, or a flow direction controller) that controls the amount of gas (exhaust gas) discharged from the circulation path 19 to the outside via the exhaust port 192 is provided, and the control device 70 controls this device. In one example, a device (such as an open / close controller, a flow rate controller, or a flow direction controller) that controls the amount of fresh air introduced into the circulation path 19 via the intake port 194 is provided. Control this equipment.

  In one embodiment, the controller 70 can include (1) a circulation mode, (2) a non-circulation mode, and (3) a partial circulation mode.

  In the circulation mode, most of the exhaust gas from the power recovery machine 16 is allocated to the circulation path 19. The air discharged from the heating chamber 12 is returned to the heating chamber 12 through the circulation path 19.

  In the non-circulation mode, almost all the exhaust gas from the heating chamber 12 is discharged to the outside. In the non-circulation mode, substantially only fresh air introduced through the air inlet 194 enters the heating chamber 12.

  In the partial circulation mode, a part of the exhaust gas (air) from the heating chamber 12 is assigned to the circulation path 19 and another part of the exhaust gas (air) from the heating chamber 12 is discharged to the outside.

  By switching the mode, the air supply amount and / or the air temperature can be changed, and an appropriate heat treatment can be executed according to the treatment situation in the heating chamber 12. For example, the control device 70 can switch modes according to the temperature in the heating chamber 12 and the state of the object in the heating chamber 12 (dry state, cured state, etc.).

  The mode can be switched based on, for example, the measurement result of the temperature of the heating air and / or the measurement result of the flow rate at a predetermined location. Alternatively or additionally, mode switching can be performed based on heating time.

  Regarding the heating system S2 of the present embodiment, the estimated COP (Coefficient of Performance, coefficient of performance) is 3.54 when the circulation rate (heat recovery rate) is 80%, and the circulation rate (heat recovery rate) is 0. % (No heat recovery) was 2.75. In the trial calculation, the efficiency of the compressor 14 was 80%, and the efficiency of the power recovery machine 16 was 80%.

  In the present embodiment, the dehumidifier 188 dehumidifies the gas flowing in the circulation path 19 or the gas compressed by the compressor 14. That is, the dehumidifier 188 is (1) between the end portion on the power recovery machine 16 side in the circulation path 19 and the merge section 196, and (2) the merge section 196 in the circulation path 19 and the inlet section (suction port) of the compressor 14. 142) and / or (3) in the air supply path 124.

  In the present embodiment, the relative humidity of the air increases with compression by the compressor 14. Dehumidification by the dehumidification system 18 reduces moisture in the air. This is advantageous, for example, in improving the processing capacity when performing a drying process in the heating chamber 12.

  FIG. 3 is a schematic diagram showing a heating system S3 according to another embodiment. In the following description, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In the present embodiment, the compressor 14 and the power recovery machine 16 are arranged relatively close to each other. Due to the proximity arrangement, the power recovered by the power recovery machine 16 can be mechanically transmitted to the compressor 14 relatively easily. The mechanical transmission of the recovery power is advantageous for reducing the loss. In the configuration for mechanically transmitting power, the compressor 14 and the power recovery machine 16 may be arranged coaxially or non-coaxially.

  Further, the close arrangement of the compressor 14 and the power recovery machine 16 is advantageous in reducing the piping space in the configuration in which the exhaust gas from the power recovery machine 16 is reused by the compressor 14. In addition, the structure which heats (preheats) the air supplied to the compressor 14 using the heat | fever (exhaust heat) which the exhaust_gas | exhaustion from the motive power recovery machine 16 has can be employ | adopted.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment. The numerical value used in the above description is an example, and the present invention is not limited to this. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the appended claims.

  S1, S2, S3: heating system, 12: heating chamber (heating device), 14: compressor (air compressor), 16: power recovery machine, 19: circulation path (exhaust heat recovery path), 70: control device, 18: Dehumidification system, 122: Heating chamber body, 124: Air supply path, 126: Air discharge path, 188: Dehumidifier.

Claims (4)

A heating chamber in which the object is placed;
A compressor for compressing the gas supplied to the heating chamber;
A power recovery machine that recovers power from the gas discharged from the heating chamber;
A circulation path in which at least a part of the gas from the power recovery machine flows toward the compressor;
A dehumidification system for dehumidifying the gas flowing in the circulation path or the gas compressed by the compressor;
A control device for controlling a circulation rate circulated through the circulation path according to a state of the object in the heating chamber ,
The control device that controls the amount of the gas that is newly introduced into the circulation path through the amount of gas, and the intake port is discharged to the outside from the circulation path via the exhaust port
Industrial heating system characterized by that. The industrial heating system according to claim 1 , wherein the dehumidifying system is provided in the circulation path . The industrial heating system according to claim 1 , wherein the dehumidifying system is provided in the gas supply path between the compressor and the heating chamber . The industrial heating system according to any one of claims 1 to 3, wherein a liquid recovered from the gas by the dehumidifying system is input to the power recovery machine .

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