JPS607174B2 - Drain removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drain removal device that collects and removes drains from boilers, paper machine dryers, and other steam equipment.

Generally, in drain recovery, steam supplied from a steam generation source radiates heat within the equipment, then the drain is released into the atmosphere using a steam trap, etc., and the high-temperature drain water is returned to the boiler using a pump or reduction equipment for recovery. This method is known, but since the steam is discarded in this open-to-atmosphere method, there is a limit to heat recovery, making it a small contribution to energy conservation, and there is also a problem with the pollution caused by the steam emitted.

For this reason, a nozzle is installed in the circulation path equipped with a conventional pump,
Drain removal involves sucking the drain using the negative pressure generated by the jet from the nozzle, passing the sucked drain through the air-cooled pipe in the circulation path, condensing it, and discharging it from the outlet provided in the middle of the circulation path. Attempts have been made to use devices that allow drains to be collected directly and achieve significantly more effective results, but the equipment that generates the drains is located low and the drain piping slopes upward toward the drain removal device. In such cases, this drain removal device has the inconvenience of not exhibiting satisfactory performance, and moreover, the drain removal function may be affected due to fluctuations in the drain pressure generated by the drain generator or differences in drain pressure between multiple drain generators. There was a drawback that it became unstable when driving. The present invention aims to provide a device with a simple configuration and low cost that can accurately eliminate these drawbacks, realize high performance of a drain removal device, and significantly improve and stabilize the drain removal ability of steam equipment. .

Another object of the present invention is to provide a high-performance drain removal device that is compact and capable of reducing the load without reducing thermal efficiency, has a large cooling effect, and has a large suction capacity. . The present invention provides a jet nozzle section between the intake port and the discharge port of the drain, and includes a pump and a circulation path for jetting water from the jet nozzle section, and the negative pressure generated by the jet flow from the jet nozzle section. It has a mechanism for suctioning and condensing the drain using the drain intake port, and the drain piping passing through the drain intake port is once raised and then lowered to form a drain reservoir, and the drain is sucked through the drain reservoir. A cooling mechanism for cooling the drain is equipped, and a pressure or temperature detector is provided in communication with a control valve provided in the cooling mechanism so as to keep the pressure or temperature in the drain reservoir constant. That is.

An embodiment of the present invention will be described with reference to the drawings. The outlet of the nozzle 2 is faced into the nozzle chamber 1, and a jet receiving port 3 which also serves as a venturi is formed opposite to the outlet of the nozzle 2. The suction port 6 of the pump 5 communicates with the nozzle 2 through a return waterway, and the discharge port 7 of the pump 5 communicates with the nozzle 2 to form a circulation path.

A drain inflow pipe 9 is connected to the nozzle chamber 1, and a drain outflow pipe 10 is connected to the return waterway 8 near the pump discharge port 7.
is connected. The drain inlet pipe 9 forms a drain reservoir in the riser pipe section 11, and this drain reservoir is equipped with a cooling mechanism for cooling the drain, such as an inlet 12 and an outlet 13 for a cooling liquid such as cooling water or cold soot. A heat exchange or flash tank 1 consisting of a coolant chamber 14 having
5 or a soft water source 1 via a soft water injection pipe 16
A mechanism for injecting soft water by contacting 7 is provided. And a detector that detects the temperature or pressure so as to maintain a constant pressure (temperature) in the riser pipe part 11 in order to adjust the drain pressure or temperature in the riser pipe part 11 which becomes the drain reservoir and to perform the drain removal function. 31 is provided in the drain inflow pipe 9, and a control valve 30 provided in the coolant pipe to the coolant chamber 14 can be operated.

In this case, a detector 306 and a drain outflow pipe 10' may be provided to detect the pressure difference between the suction side and the discharge side, and the control valve 30 can be operated by a controller 32 such as a calculator. In the specific example shown in FIG. 2, in order to enhance the cooling effect, the cooling liquid chamber 14, the flash tank 15 and/or the soft water injection pipe 16, and the soft water source 17 that constitute the cooling mechanism are used.
It is equipped with a combination of , but you can choose one or choose two or more and combine them as needed.

In this case, the soft water injection mechanisms 16 and 17 may utilize the soft water used in the boiler, or the drain may be purged and stored in a tank for use as soft water. In any case, the temperature or pressure is detected to maintain a constant pressure (temperature) in the riser pipe section 11, and an appropriate amount of soft water can be injected manually or automatically from the control valve 30' installed from the soft water inlet. be. Note that it is also effective to use a warning buzzer or a warning lamp in addition to or in place of the detector 31.

In the figure, radiating fins 19 formed in the return waterway are provided at the intake portion of the drain inlet pipe 9 as a strainer.

A 20' separate tank is interposed in the drain outflow pipe 10.

21 is a gas separator, 22 is a boiler, 23 is a flow rate control valve,
24 is a check valve, 25 is a discharge valve, 26 is a dryer, 2
7 is a steam valve, 28 is a pump motor, 29 is a cooling liquid source,
33 is a bypass pipe, 34 and 35 are valves, and 36 is a water injection pipe.

When the pump 5 is operated, water is injected as a jet from the nozzle 2 into the nozzle chamber 1 through the discharge port 7 and the return channel 8, enters the suction channel 4 from the jet receiver □3, and enters the suction port 6. However, as a high-speed jet is ejected from the outlet of the nozzle 2, the pressure inside the nozzle chamber 1 decreases, and due to this reduced pressure, drain is sucked from a drain source such as the dryer 26 through the drain inlet pipe 9, and flows into the nozzle chamber 1. It enters the circulation path together with the jet from the inlet jet socket 3.

Then, the drain is temporarily stored in the riser pipe section 11 which becomes a drain reservoir of the drain inflow pipe 9, and the cooling mechanism 1
4, etc., the water vapor of the drain water condenses, becomes a jet, and circulates through the return channel 8 together with the water that entered from the jet receiving port 3. On the other hand, since the circulation path operates in a full state at all times, the drain is sucked in from the drain inflow pipe 9 and condenses in the circulation path, increasing the amount of water, and this excess water is discharged from the drain outflow pipe 10 and drains. It is possible to easily and accurately collect the materials directly.
In addition, the above-mentioned start-up detector detects changes in temperature or pressure and adjusts the function of the cooling mechanism to maintain a constant pressure or temperature, and the drain removal function can be properly performed. It is easy to follow and drive. The present invention provides a jet nozzle section between the intake port and the discharge port of the drain, and includes a pump and a circulation path for jetting water from the jet nozzle section, and the negative pressure generated by the jet flow from the jet nozzle section. In a device that utilizes a drain to suction and condense recovery, a drain reservoir is formed in the drain piping that fits into the drain intake port, and a cooling mechanism is provided to cool the drain sucked through the drain reservoir. A pressure or temperature detector is provided in communication with a control valve provided in the cooling mechanism so as to keep the pressure or temperature in the drain reservoir constant, thereby increasing the drain removal function and increasing the drain removal function in the drain generator. It can be quickly sucked and collected without leaving any residue, and the drain removal device can always operate at high performance in good condition without reducing the thermal efficiency of the equipment.It also has a large cooling effect and can easily adjust the drain temperature or pressure. It is easy to use, the amount of drain suction is large, the drain discharge capacity is improved, equipment performance is improved, and steam traps can be omitted, making the equipment very compact, which has great advantages in terms of installation and maintenance. In addition, the drain discharge pressure can be increased, making it easier to transport the drain, which helps in heat recovery, makes adjustment more effective, and simplifies the process.Furthermore, it can be applied to drain recovery from a wide range of steam-using equipment. Since it can be used as a closed system, it is easy to improve heat management and save energy by recovering heat from the drain, contributing to economical operation. This has the effect of making it possible to operate the vehicle more efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a system explanatory diagram and FIG. 2 being a system explanatory diagram of another embodiment. 1... Nozzle chamber, 2... Nozzle, 3... Jet socket,
4...Suction waterway, 5...Pump, 6...
・...Suction port, 7...Discharge port, 8...
Return waterway, 9...Drain inflow pipe, 10...
...Drain outflow pipe, 11...Rise pipe section, 12...Inlet, 13...Outlet,
14...Cooling liquid chamber, 15...Flash tank, 16...Soft water injection piping, 17...
... Soft water source, 18 ... Radiation fin, 19 ...
...Strainer, 20...Separate tank,
21... Gas separator, 22... Boiler, 23.
...Flow control valve, 24...Check valve, 25
...Release valve, 26...Dryer, 27...
・Steam valve, 28...Pump motor, 29...
...Cooling water source, 30...Control valve, 31...
Detector, 32... Controller, 33... Bypass pipe, 34, 35... Valve, 36... Water injection pipe. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A jet nozzle section is provided between the intake port and the discharge port of the drain, and a pump and a circulation path are provided for jetting water from the jet nozzle section, and the negative water generated by the jet flow from the jet nozzle section is provided. In devices that use pressure to suction drain and condense recovery, a cooling mechanism is installed that forms a drain reservoir in the drain piping that communicates with the drain intake and cools the drain that is sucked through the drain reservoir. . A drain removal device, characterized in that a pressure or temperature detector is disposed in communication with a control valve provided in the cooling mechanism so as to keep the pressure or temperature in the drain reservoir constant. 2. The drain removal device according to claim 1, wherein the cooling mechanism is a heat exchanger, and is connected to a cooling water source by a pipe having a control valve. 3. The drain removal device according to claim 1, wherein the cooling mechanism is a soft water injector, and is connected to a soft water source through a pipe having a control valve. 4. Claim 1, wherein the drain reservoir is a raised part where the drain pipe is raised once and then lowered.
3. Drain removal device according to item 1, 2 or 3. 5. The drain removal device according to claim 2, 3, or 4, wherein the detector is provided on the drain suction pipe side. 6. Drain removal according to claim 3, 4, or 5, wherein the cooling mechanism is a soft water injector, and the pipes are connected so that soft water is injected into the drain suction side. Device. 7. The drain removal device according to claim 6, wherein the detector is provided on the suction side and the discharge side and detects a pressure difference between the two.