Condensate water conveying system

Abstract

The invention provides a condensate water conveying system which comprises a pump shell and a titanium dioxide baking tray, a condensate water inlet of the pump shell is communicated with a condensate water collecting tank, a condensate water outlet of the pump shell is communicated with a boiler room, an exhaust port of the pump shell is connected with a first pneumatic valve, a power medium air inlet of the pump shell is connected with a second pneumatic valve, and a PLC is electrically connected with the first pneumatic valve and the second pneumatic valve; the second liquid level sensor is located on the upper portion of the pump shell and electrically connected with the PLC. The first pneumatic valve is communicated with the condensate water collecting tank through a first pipeline; a first exhaust pipe is arranged at the top of the condensate water collecting tank and connected with the titanium dioxide baking tray. The liquid level in the pump shell is monitored through the liquid level meter, and a signal is transmitted to the PLC in real time; the PLC controls the opening and closing states of the first pneumatic valve and the second pneumatic valve, opening and closing of the exhaust port and the power medium air inlet are achieved, the problem that in the prior art, due to floating ball clamping stagnation and liquid level stiffness, a pump body stops running is solved, and the running reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyamide polymer condensate water conveying, and particularly relates to a condensate water conveying system. BACKGROUND

[0002] In the field of polymer production, a large amount of condensate water is generated after steam is exchanged by heat, and the condensate water is generally reused, collected and conveyed to a boiler water supply system. The condensate water conveying needs to provide a power energy, and a pump such as a centrifugal pump or a mechanical pump is generally used for conveying. The centrifugal pump has high power consumption and is not energy-saving, the condensate water has high gas content, and cavitation and other phenomena are easily generated, so that the maintenance cost of the centrifugal pump is also high. The mechanical pump is more energy-saving than the centrifugal pump. The mechanical pump is composed of a pump body, a floating ball mechanism, a spring pressing mechanism, a power medium inlet valve and an exhaust valve. The pump body is provided with a condensate water inlet and a condensate water outlet. When the condensate water is injected into the pump body, the exhaust valve is in an open state to exhaust the steam generated by the condensate water from the pump body, so as to avoid the problem of excessive back pressure.

[0003] With the injection of the condensate water, the floating ball mechanism gradually rises. When the floating ball mechanism reaches the highest position, the spring pressing device is triggered to open the power medium inlet valve, and at the same time, the exhaust valve is closed, so that the condensate water is pressed out of the pump body by the power medium.

[0004] The mechanical parts of the mechanical pump are abraded more severely under frequent action, and need to be replaced regularly. During the operation of the mechanical pump, there is a relatively strict back pressure requirement. If the back pressure exceeds the limit value, the internal floating ball does not move due to the stagnation of the liquid level in the pump, and the mechanical pump stops running. Therefore, in order to ensure the continuous action of the mechanical pump, the back pressure steam needs to be discharged and released, which causes waste of steam. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a condensate water conveying system, which can improve the operation reliability of the condensate water conveying system and increase the utilization rate of steam.

[0006] The present application is implemented as follows: The present application provides a condensate water conveying system, which comprises a pump shell, the pump shell is provided with a condensate water inlet, a condensate water outlet, a power medium inlet, an exhaust port and a PLC, the condensate water inlet is communicated with a condensate water collecting tank, the condensate water outlet is communicated with a boiler room, the exhaust port is connected with a first pneumatic valve, the power medium inlet is connected with a second pneumatic valve, and the PLC is electrically connected with the first pneumatic valve and the second pneumatic valve. The pump shell is further connected with a liquid level meter, the liquid level meter at least comprises a second liquid level sensor, the second liquid level sensor is located at the upper part of the pump shell, and the second liquid level sensor is electrically connected with the PLC. The first pneumatic valve is communicated with the condensate water collecting tank through a first pipeline, and is used for returning steam to the condensate water collecting tank. The system further comprises a titanium dioxide baking tray. A first exhaust pipe is arranged on the top of the condensate water collecting tank, and a ninth gate valve is arranged on the first exhaust pipe.

[0007] Further, the liquid level meter further comprises a first liquid level sensor, which is arranged on the lower part of the pump shell and is electrically connected with the PLC.

[0008] Further, the top of the condensate water collecting tank is further connected with a second exhaust pipe, the second exhaust pipe is connected with a jet pump, the jet pump is connected with a high-pressure steam conveying pipe and a mixed steam conveying pipe, the mixed steam conveying pipe is connected with a second pipeline, and the second pipeline is communicated with a second pneumatic valve.

[0009] Further, a pressure reducing valve and a third gate valve are arranged on the second pipeline.

[0010] Further, a fourth gate valve is arranged between the second pneumatic valve and the pressure reducing valve.

[0011] Further, a high-pressure steam flow meter is arranged on the high-pressure steam conveying pipe, and a mixed steam flow meter is arranged on the mixed steam conveying pipe.

[0012] Further, the condensate water collecting tank is connected with a flash tank through a third pipeline, and a fifth gate valve and a third trap are arranged on the third pipeline.

[0013] Further, a branch pipe is connected with the first exhaust pipe, a first gate valve and a first trap are arranged on the branch pipe, and a second gate valve and a second trap are further connected with the titanium dioxide baking tray away from the first exhaust pipe.

[0014] The present application has the advantages that: the liquid level in the pump shell is monitored by the liquid level meter, and the signal is transmitted to the PLC in real time; the PLC automatically controls the opening and closing states of the first pneumatic valve and the second pneumatic valve according to the preset logic, realizes the opening and closing of the exhaust port and the power medium inlet, and avoids the problem that the pump body stops running due to the floating ball jamming and the liquid level stagnation in the prior art, thereby improving the reliability of operation.

[0015] The steam in the condensate water collecting tank is used for steam waste heat baking through the titanium dioxide baking tray, so as to recycle the titanium dioxide in the production waste liquid, and the low-pressure steam can be reused, thereby avoiding the waste of steam. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below with reference to the embodiments and the accompanying drawings.

[0017] Figure 1 Fig. 1 is a schematic view of a condensate water conveying system according to the present application.

[0018] Reference signs in the figures: 1, pump shell; 2, fourth pipeline; 3, low-pressure condensate water conveying pipe; 4, condensate water collecting tank; 5, fifth pipeline; 51, second check valve; 52, seventh gate valve; 6, first pneumatic valve; 7, second pneumatic valve; 8, PLC; 9, first liquid level sensor; 10, second liquid level sensor; 11, first pipeline; 111, eighth gate valve; 12, titanium dioxide baking tray; 13, first exhaust pipe; 14, branch pipe; 141, first gate valve; 142, first trap; 15, second gate valve; 16, second trap; 17, second exhaust pipe; 18, jet pump; 19, high-pressure steam conveying pipe; 20, mixed steam conveying pipe; 21, second pipeline; 22, pressure reducing valve; 23, third gate valve; 24, fourth gate valve; 25, high-pressure steam flow meter; 26, mixed steam flow meter; 27, flash tank; 28, fifth gate valve; 29, third trap; 30, first check valve; 31, sixth gate valve; 32, ninth gate valve. DETAILED DESCRIPTION

[0019] Referring to Figure 1 The present application provides a condensate water conveying system, comprising a pump shell 1, wherein the pump shell 1 is provided with a condensate water inlet, a condensate water outlet, a power medium inlet, an exhaust port and a PLC 8, the condensate water inlet is communicated with a condensate water collecting tank 4 through a fourth pipeline 2, the fourth pipeline 2 is provided with a first check valve 30 and a sixth gate valve 31, the condensate water collecting tank 4 is connected with a low-pressure condensate water conveying pipe 3, and low-pressure condensate water is conveyed into the condensate water collecting tank 4 through the low-pressure condensate water conveying pipe 3. The condensate water outlet is communicated with a boiler room through a fifth pipeline 5, the fifth pipeline 5 is provided with a second check valve 51 and a seventh gate valve 52, The exhaust port is connected with a first pneumatic valve 6, the power medium inlet is connected with a second pneumatic valve 7, and the PLC 8 is electrically connected with the first pneumatic valve 6 and the second pneumatic valve 7.

[0020] The pump shell 1 is further connected with a liquid level meter, wherein the liquid level meter comprises at least a second liquid level sensor 10, the second liquid level sensor 10 is located at the upper portion of the pump shell 1, and the second liquid level sensor 10 is electrically connected with the PLC 8. The system further comprises a condensed water collecting tank 4 and a titanium dioxide baking tray 12; the top of the condensed water collecting tank 4 is provided with a first exhaust pipe 13, and the first exhaust pipe 13 is further provided with a ninth gate valve 32; the first exhaust pipe 13 is connected with the titanium dioxide baking tray 12; the first exhaust pipe 13 is connected with a branch pipe 14; the branch pipe 14 is provided with a first gate valve 141 and a first trap valve 142; the titanium dioxide baking tray 12 is further connected with a second gate valve 15 and a second trap valve 16 on the side away from the first exhaust pipe 13.

[0021] Specifically, the liquid level meter further comprises a first liquid level sensor 9, which is located at the lower part of the pump shell 1 and electrically connected with the PLC 8.

[0022] Specifically, the top of the condensed water collecting tank 4 is further connected with a second exhaust pipe 17; the second exhaust pipe 17 is connected with a jet pump 18; the jet pump 18 is connected with a high-pressure steam conveying pipe 19 and a mixed steam conveying pipe 20; the mixed steam conveying pipe 20 is connected with a second pipeline 21, which is communicated with the second pneumatic valve 7.

[0023] Specifically, the second pipeline 21 is provided with a pressure reducing valve 22 and a third gate valve 23; the pressure of the mixed steam after pressure reduction is 0.35-0.4 Mpa.

[0024] Specifically, the second pneumatic valve 7 and the pressure reducing valve 22 are further provided with a fourth gate valve 24.

[0025] Specifically, the high-pressure steam conveying pipe 19 is provided with a high-pressure steam flow meter 25; the mixed steam conveying pipe 20 is provided with a mixed steam flow meter 26.

[0026] Specifically, the condensed water collecting tank 4 is connected with a flash tank 27 through a third pipeline; the third pipeline is provided with a fifth gate valve 28 and a third trap valve 29; the flash tank 27 receives medium-pressure steam condensed water; part of the condensed water in the flash tank 27 is rapidly vaporized to generate low-pressure steam, which is conveyed to the condensed water collecting tank 4 through the third pipeline.

[0027] One specific application of the present application is: During the polymeric production of polyamide fiber, steam is used for heat exchange to generate condensed water, which is conveyed to the condensed water collecting tank 4 through the low-pressure condensed water conveying pipe 3.

[0028] Condensate water is transported to the pump shell 1 through the fourth pipeline 2, and when the liquid level of the condensate water in the pump shell 1 rises to a set second liquid level (such as the A2 point in the figure), the second liquid level sensor 10 feeds back to the PLC 8, and the PLC 8 controls the first pneumatic valve 6 to close and the second pneumatic valve 7 to open. Through the instantaneous release of the mixed steam after pressure reduction into the pump shell 1 full of condensate water, the pressure energy of the mixed steam is transmitted to the condensate water, and is converted into the kinetic energy of the condensate water. After the condensate water obtains the kinetic energy, it flows out of the pump shell 1 at high speed, enters the fifth pipeline 5, and is transported to the boiler water replenishing and deoxidizing system through the fifth pipeline 5. When the liquid level in the pump shell 1 drops to a set first liquid level (such as the A1 point in the figure), the PLC 8 controls the second pneumatic valve 7 to close, opens the first pneumatic valve 6, and opens the exhaust passage of the pump shell 1, so that the condensate water is replenished into the pump shell 1 again. This is repeated continuously, so that the condensate water is pumped to the boiler room.

[0029] Considering that the first liquid level sensor 9 is always in the condensate water coverage area and has a high temperature, the working reliability of the first sensor is affected and sometimes does not work, the information transmission is interrupted, and the running reliability of the pump is reduced. Therefore, to solve this problem, the first liquid level sensor 9 can also be cancelled, and a command mode is set for the PLC 8, that is, after the second liquid level sensor 10 is triggered, after a certain number of seconds (such as 16 seconds, and the specific time is the time required for normal exhaust of the condensate water in the pump), the PLC 8 automatically simulates the signal of the first liquid level sensor 9 to control the second pneumatic valve 7 to close and the first pneumatic valve 6 to open. This mode can greatly improve the running reliability of the delivery pump.

[0030] Considering that the second liquid level sensor 10 may also fail or occasionally be insensitive, in actual use, the second liquid level sensor 10 works well, but occasionally fails once or twice. That is, when the liquid level reaches the A2 point, no signal is sent to the PLC 8, which causes the system to stop running. Therefore, the signal transmission of the second liquid level sensor 10 can be further improved. When the first liquid level sensor 9 simulates the signal sending, the pump shell 1 starts to replenish the liquid level, and the PLC 8 is set to receive the signal from the second liquid level sensor 10 after 20 seconds + 5 seconds, that is, 25 seconds. If no signal is received, the PLC 8 automatically simulates the signal receiving to complete the action of closing the first pneumatic valve 6 and opening the second pneumatic valve 7. The 20 seconds is the time for normal replenishment of the liquid level in the pump, and the 5 seconds is the lag time (the specific time can also be set according to the needs).

[0031] After the first pneumatic valve 6 is opened, the steam in the pump shell 1 is discharged to the condensate collecting tank 4 through the first pipeline 11, the low-pressure steam in the condensate collecting tank 4 is partly delivered to the titanium dioxide baking tray through the first exhaust pipe 13, and is partly delivered to the jet pump 18 through the second exhaust pipe 17, and after being mixed with high-pressure steam, mixed steam is formed, and the mixed steam is partly delivered to the workshop through the pipeline to reuse the steam, and the mixed steam is partly connected with the second pneumatic valve 7 through the second pipeline 21 to serve as a power medium.

[0032] By delivering part of the steam originally required to be discharged to the titanium dioxide baking tray 12 to perform steam waste heat baking, the titanium dioxide in the production waste liquid is recycled, and the other part is mixed with high-pressure steam to form mixed steam, so that the utilization rate of steam is improved.

[0033] The liquid level in the pump shell is monitored by the liquid level meter, and the signal is transmitted to the PLC in real time; the PLC automatically controls the opening and closing states of the first pneumatic valve and the second pneumatic valve according to the preset logic, realizes the opening and closing of the exhaust port and the power medium inlet, and avoids the problem that the pump body stops running due to the floating ball jamming and the liquid level stagnation in the prior art, and improves the reliability of operation.

[0034] By delivering the steam in the condensate collecting tank to the titanium dioxide baking tray to perform steam waste heat baking, the titanium dioxide in the production waste liquid is recycled, the low-pressure steam can be reused, and the waste of steam is avoided.

[0035] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific examples described are only illustrative, and are not intended to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A condensate delivery system, characterized in that: The pump includes a pump housing, which is provided with a condensate inlet, a condensate outlet, a power medium inlet, an exhaust port, and a PLC. The condensate inlet is connected to a condensate collection tank, the condensate outlet is connected to a boiler room, the exhaust port is connected to a first pneumatic valve, the power medium inlet is connected to a second pneumatic valve, and the PLC is electrically connected to the first and second pneumatic valves. The pump housing is also connected to a level gauge, which includes at least one second level sensor. The second level sensor is located at the upper part of the pump housing and is electrically connected to the PLC. The first pneumatic valve is connected to the condensate collection tank through the first pipe and is used to send steam back to the condensate collection tank; The system also includes a titanium dioxide baking pan; The top of the condensate collection tank is provided with a first exhaust pipe, and the first exhaust pipe is provided with a ninth gate valve. The first exhaust pipe is connected to the titanium dioxide baking pan.

2. The condensate delivery system as described in claim 1, characterized in that: The level gauge also includes a first level sensor, which is located at the lower part of the pump housing and is electrically connected to the PLC.

3. A condensate delivery system as described in claim 1, characterized in that: The top of the condensate collection tank is also connected to a second exhaust pipe, which is connected to a jet pump. The jet pump is connected to a high-pressure steam delivery pipe and a mixed steam delivery pipe. The mixed steam delivery pipe is connected to a second pipe, which is connected to a second pneumatic valve.

4. A condensate delivery system as described in claim 3, characterized in that: The second pipeline is equipped with a pressure reducing valve and a third gate valve.

5. A condensate delivery system as described in claim 4, characterized in that: A fourth gate valve is also provided between the second pneumatic valve and the pressure reducing valve.

6. A condensate delivery system as described in claim 3, characterized in that: The high-pressure steam conveying pipe is equipped with a high-pressure steam flow meter; the mixed steam conveying pipe is equipped with a mixed steam flow meter.

7. A condensate delivery system as described in claim 1, characterized in that: The condensate collection tank is connected to a flash tank via a third pipe, and the third pipe is equipped with a fifth gate valve and a third steam trap.

8. A condensate delivery system as described in claim 1, characterized in that: The first exhaust pipe is connected to a branch pipe, and the branch pipe is equipped with a first gate valve and a first drain valve. The titanium dioxide baking pan is also connected to a second gate valve and a second drain valve on the side away from the first exhaust pipe.

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