A blowdown device and method for a steam and water sampling apparatus

Abstract

The application discloses a kind of steam water sampling equipment and method for discharging device, sampling device blowdown pipeline is communicated with the blowdown water inlet of buffer water tank by primary blowdown electric valve, secondary blowdown electric valve and pressure balance tank, blowdown pressure transmitter is communicated on the pipeline between primary blowdown electric valve and secondary blowdown electric valve, buffer pressure transmitter is communicated on the pipeline between secondary blowdown electric valve and pressure balance tank, desalted water pipeline is communicated with the water supplement port of buffer water tank by water inlet electric valve, the outlet of buffer water tank is communicated with pressure balance tank by frequency conversion balance booster pump and booster pump outlet check valve, the blowdown port of buffer water tank is communicated with final waste water discharge point by blowdown end control electric valve, during blowdown process, the start-stop and operating frequency of frequency conversion balance booster pump are controlled, the difference between blowdown pressure and buffer pressure of buffer water tank is maintained within rated range, the device and method can avoid frequent replacement of high-temperature and high-pressure blowdown valve, and safety is higher.

Description

Technical Field

[0001] This invention belongs to the field of steam and water sampling technology in thermal power plant furnaces, and relates to a sewage discharge device and method for steam and water sampling equipment. Background Technology

[0002] To ensure the safe and stable operation of thermal power units, it is necessary to monitor and analyze the water samples at various points in the boiler's steam-water system using steam-water sampling equipment, so as to keep track of the steam-water quality of the boiler's steam-water system in real time.

[0003] During the sampling process, the pipelines along the route and the internal components of the sampling equipment may contaminate the sample water, affecting the monitoring and analysis results. To ensure the accuracy of the sample water measurement, it is necessary to periodically drain the high-temperature sample water through the high-temperature and high-pressure drain valve on the high-temperature rack of the sampling equipment.

[0004] The temperature and pressure at various sampling points inside the furnace of thermal power plants are generally high. Some sample water temperatures can reach over 400℃ and pressures can reach over 30MPa. When the drain valve is opened to discharge sewage, the high-temperature and high-pressure sample water will cause severe high-temperature and high-pressure erosion on the valve tip, seriously damaging the internal structure of the high-temperature and high-pressure valve. This leads to frequent failures of the high-temperature and high-pressure valve, which cannot close normally, resulting in leakage of high-temperature and high-pressure sample water and thus creating a relatively serious safety hazard.

[0005] To address the frequent damage to high-temperature and high-pressure valves, a common practice is to install a dual-valve series structure on the wastewater discharge pipeline of the steam-water sampling equipment. The first-stage valve acts as a shut-off valve, while the second-stage valve serves as a sacrificial valve. During discharge, the first-stage valve is fully opened first. Since the second-stage valve is closed at this time, the high-temperature and high-pressure sample water will not cause high-temperature and high-pressure erosion to the first-stage valve. Then, the second-stage sacrificial valve is opened. At the moment of opening, the high-temperature and high-pressure sample water erodes the valve tip of the sacrificial valve. After discharge, the sacrificial valve is closed first to reduce the flow rate of the high-temperature and high-pressure sample water before the first-stage shut-off valve is closed, thus protecting the shut-off valve and ensuring its long-term reliable operation.

[0006] In this method, thermal power plant operators need to frequently replace the second-stage high-temperature and high-pressure drain valve, which serves as a sacrificial valve. On the one hand, the high-temperature and high-pressure valve is connected by welding, making replacement time-consuming and laborious; on the other hand, there is high-temperature and high-pressure sample water in the surrounding area during the operation, posing a serious safety hazard. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sewage discharge device and method for a soda sampling device. This device and method can avoid frequent replacement of high-temperature and high-pressure sewage discharge valves and has high safety.

[0008] To achieve the above objectives, the present invention discloses a wastewater discharge device for a soda sampling equipment, comprising a wastewater discharge pipe for the sampling device, a buffer water tank, a demineralized water pipe, a wastewater discharge endpoint control electric valve, and a final wastewater discharge point;

[0009] The sampling device's sewage discharge pipeline is connected to the sewage inlet of the buffer tank via a primary sewage discharge electric valve, a secondary sewage discharge electric valve, and a pressure balancing tank. A sewage discharge pressure transmitter is connected to the pipeline between the primary and secondary sewage discharge electric valves, and a buffer pressure transmitter is connected to the pipeline between the secondary sewage discharge electric valve and the pressure balancing tank. The demineralized water pipeline is connected to the water supply port of the buffer tank via an inlet electric valve. The outlet of the buffer tank is connected to the pressure balancing tank via a variable frequency balanced booster pump and a booster pump outlet check valve. The sewage discharge port of the buffer tank is connected to the final wastewater discharge point via a sewage discharge endpoint control electric valve. During the sewage discharge process, the start-up, shutdown, and operating frequency of the variable frequency balanced booster pump are controlled to maintain the difference between the sewage discharge pressure and the buffer pressure within the rated range.

[0010] The buffer tank is equipped with a level gauge on its side wall.

[0011] It also includes an automatic control system. The input end of the automatic control system is connected to the level gauge, the sewage pressure transmitter and the buffer pressure transmitter. The output end of the automatic control system is connected to the primary sewage electric valve, the secondary sewage electric valve, the inlet electric valve, the sewage discharge endpoint control electric valve and the variable frequency balance booster pump.

[0012] The wastewater discharge method for the carbonated beverage sampling equipment of the present invention includes the following steps:

[0013] When the sampling equipment starts discharging wastewater, the primary discharge electric valve is opened first. The discharge pressure transmitter displays the discharge pressure of the buffer tank. The variable frequency balance booster pump is started. The demineralized water in the buffer tank flows back to the buffer tank through the booster pump outlet check valve and pressure balance tank. The operating frequency of the variable frequency balance booster pump is adjusted to control the flow rate of the variable frequency balance booster pump, thereby controlling the buffer pressure measured by the buffer pressure transmitter. When the buffer pressure measured by the buffer pressure transmitter is lower than the discharge pressure measured by the discharge pressure transmitter by the rated range, the secondary discharge electric valve is opened. At this time, the wastewater discharged from the sampling equipment flows back to the buffer tank together with the demineralized water through the pressure balance tank. The discharge endpoint control electric valve is opened to discharge the wastewater from the sampling equipment to the final wastewater discharge point.

[0014] The buffer tank is equipped with a level gauge on its side wall.

[0015] Also includes:

[0016] Before the sampling equipment starts discharging sewage, it determines whether the liquid level of the buffer tank measured by the level gauge is within the allowable operating liquid level range. When the liquid level of the buffer tank is lower than the allowable operating liquid level range, the inlet electric valve is opened to inject water into the buffer tank, so that the liquid level in the buffer tank reaches the allowable operating liquid level range, and then the inlet electric valve is automatically closed.

[0017] When the sampling equipment finishes discharging sewage, close the secondary sewage discharge electric valve, then close the sewage discharge endpoint control electric valve and the primary sewage discharge electric valve in sequence, and then stop the operation of the variable frequency balance booster pump.

[0018] The rated range is 0.1-0.3 MPa.

[0019] The present invention has the following beneficial effects:

[0020] In specific operation, the wastewater discharge device and method for the steam and water sampling equipment described in this invention involves a wastewater pressure transmitter connected to the pipeline between the primary and secondary wastewater electric valves, and a buffer pressure transmitter connected to the pipeline between the secondary wastewater electric valve and the pressure balance tank. During the wastewater discharge process of the steam and water sampling equipment, the operating frequency of the variable frequency balance booster pump is automatically adjusted to control the difference between the wastewater discharge pressure and the buffer pressure within the rated range, completely avoiding high-temperature and high-pressure erosion of the wastewater discharge valve, thereby improving the operational reliability of the steam and water sampling equipment. Simultaneously, the final wastewater discharge after water distribution through the buffer tank also avoids potential safety hazards caused by excessively high sample water temperature during the wastewater discharge process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Among them, 1 is the primary sewage discharge electric valve, 2 is the sewage discharge pressure transmitter, 3 is the secondary sewage discharge electric valve, 4 is the buffer pressure transmitter, 5 is the pressure balancing tank, 6 is the sewage discharge endpoint control electric valve, 7 is the buffer water tank, 8 is the level gauge, 9 is the variable frequency balancing booster pump, 10 is the water inlet electric valve, 11 is the booster pump outlet check valve, and 12 is the automatic control system. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0024] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0025] refer to Figure 1 The wastewater sampling device of the present invention includes a wastewater discharge pipe for the sampling device, a primary wastewater discharge electric valve 1, a wastewater discharge pressure transmitter 2, a secondary wastewater discharge electric valve 3, a buffer pressure transmitter 4, a pressure balancing tank 5, a wastewater discharge endpoint control electric valve 6, a buffer water tank 7, a level gauge 8, a frequency conversion balancing booster pump 9, a water inlet electric valve 10, a booster pump outlet check valve 11, and an automatic control system 12.

[0026] The sewage discharge pipeline of the sampling device is connected to the sewage inlet of the buffer tank 7 via a primary sewage discharge electric valve 1, a secondary sewage discharge electric valve 3, and a pressure balancing tank 5. A sewage discharge pressure transmitter 2 is connected to the pipeline between the primary sewage discharge electric valve 1 and the secondary sewage discharge electric valve 3. A buffer pressure transmitter 4 is connected to the pipeline between the secondary sewage discharge electric valve 3 and the pressure balancing tank 5. The demineralized water pipeline is connected to the water supply port of the buffer tank 7 via an inlet electric valve 10. A level gauge 8 is installed on the side wall of the buffer tank 7. The outlet of the buffer tank 7 is connected to the pressure balancing tank 5 via a frequency conversion balancing booster pump 9 and a booster pump outlet check valve 11. The sewage discharge port of the buffer tank 7 is connected to the final wastewater discharge point via a sewage discharge endpoint control electric valve 6.

[0027] In this embodiment, an automatic control system 12 is also included. The input end of the automatic control system 12 is connected to the level gauge 8, the sewage pressure transmitter 2, and the buffer pressure transmitter 4. The output end of the automatic control system 12 is connected to the primary sewage electric valve 1, the secondary sewage electric valve 3, the water inlet electric valve 10, the sewage discharge endpoint control electric valve 6, and the variable frequency balance booster pump 9. By monitoring the signals measured by the level gauge 8, the sewage pressure transmitter 2, and the buffer pressure transmitter 4, the system controls the opening and closing of the primary sewage electric valve 1, the secondary sewage electric valve 3, the water inlet electric valve 10, and the sewage discharge endpoint control electric valve 6, as well as the start, stop, and frequency of the variable frequency balance booster pump 9, ultimately realizing the automatic and safe sewage discharge of the sewage discharge device for the steam and water sampling equipment.

[0028] refer to Figure 1 The wastewater discharge method for the carbonated beverage sampling device of the present invention includes the following steps:

[0029] 1) Before the sampling equipment starts discharging sewage, it first determines whether the liquid level of the buffer tank 7 measured by the level gauge 8 is within the allowable operating liquid level range. When the liquid level of the buffer tank 7 is lower than the allowable operating liquid level range, the inlet electric valve 10 is opened to inject water into the buffer tank 7 so that the liquid level in the buffer tank 7 reaches the allowable operating liquid level range, and then the inlet electric valve 10 is automatically closed.

[0030] 2) When the sampling equipment starts discharging wastewater, first open the primary discharge electric valve 1. The discharge pressure transmitter 2 displays the current discharge pressure. Start the variable frequency balance booster pump 9. The demineralized water in the buffer tank 7 flows back to the buffer tank 7 through the variable frequency balance booster pump 9, the booster pump outlet check valve 11, and the pressure balance tank 5. Adjust the operating frequency of the variable frequency balance booster pump 9 to control its flow rate, thereby controlling the buffer pressure measured by the buffer pressure transmitter 4. When the buffer pressure measured by the buffer pressure transmitter 4 is 0.1-0.3 MPa lower than the discharge pressure measured by the discharge pressure transmitter 2, control the secondary discharge electric valve 3 to open. At this time, the wastewater discharged from the sampling equipment flows back to the buffer tank 7 together with the demineralized water through the pressure balance tank 5. Open the discharge endpoint control electric valve 6 to discharge the wastewater from the sampling equipment to the final wastewater discharge point.

[0031] 3) When the sampling equipment finishes discharging sewage, close the secondary sewage discharge electric valve 3, then close the sewage discharge endpoint control electric valve 6 and the primary sewage discharge electric valve 1 in sequence, and then stop the operation of the variable frequency balance booster pump 9. The automatic sewage discharge process of the sampling equipment ends.

[0032] During the automatic sewage discharge process of the sampling equipment, the automatic control system 12 acquires the measured values ​​of the sewage discharge pressure transmitter 2 and the buffer pressure transmitter 4 in real time. By automatically adjusting the operating frequency of the variable frequency balance booster pump 9, the difference between the sewage discharge pressure and the buffer pressure is controlled within the range of 0.1-0.3 MPa, thereby ensuring that the flow rate of the sewage discharged from the sampling equipment is within a safe range. This completely avoids the high temperature and high pressure erosion of the sewage discharge valve during the sewage discharge process of the steam and water sampling equipment, thereby improving the operational reliability of the steam and water sampling equipment and eliminating the safety hazards that may be caused by frequent replacement of the sewage discharge valve of the steam and water sampling equipment.

[0033] The automatic control system 12 monitors the liquid level information measured by the level gauge 8. When the liquid level in the buffer tank 7 is low, it opens the inlet electric valve 10 to automatically replenish the buffer tank 7. During the sewage discharge process, it controls the start-up, shutdown, and operating frequency of the variable frequency balance booster pump 9 to maintain the difference between the sewage discharge pressure and the buffer pressure in the buffer tank 7 within the rated range. Based on the system operation, it controls the opening and closing of the primary sewage discharge electric valve 1, the secondary sewage discharge electric valve 3, and the sewage discharge endpoint control electric valve 6 to automatically discharge sewage from the steam and water sampling equipment.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A wastewater discharge device for a soft drink sampling apparatus, characterized in that, Includes the sampling device sewage pipe, buffer water tank (7), demineralized water pipe, sewage discharge endpoint control electric valve (6) and final wastewater discharge point; The sewage discharge pipeline of the sampling device is connected to the sewage inlet of the buffer tank (7) via a primary sewage discharge electric valve (1), a secondary sewage discharge electric valve (3), and a pressure balancing tank (5). A sewage discharge pressure transmitter (2) is connected to the pipeline between the primary sewage discharge electric valve (1) and the secondary sewage discharge electric valve (3). A buffer pressure transmitter (4) is connected to the pipeline between the secondary sewage discharge electric valve (3) and the pressure balancing tank (5). The demineralized water pipeline is connected to the buffer tank (7) via an inlet electric valve (10). The outlet of the buffer tank (7) is connected to the pressure balance tank (5) via the variable frequency balance booster pump (9) and the booster pump outlet check valve (11). The sewage outlet of the buffer tank (7) is connected to the final wastewater discharge point via the sewage discharge endpoint control electric valve (6). During the sewage discharge process, the start-up and shutdown and operating frequency of the variable frequency balance booster pump (9) are controlled to maintain the difference between the sewage discharge pressure measured by the sewage discharge pressure transmitter (2) and the buffer pressure measured by the buffer pressure transmitter (4) within the rated range.

2. The wastewater discharge device for the carbonated beverage sampling equipment according to claim 1, characterized in that, The side wall of the buffer tank (7) is equipped with a level gauge (8).

3. The wastewater discharge device for the soda sampling equipment according to claim 2, characterized in that, It also includes an automatic control system (12), the input end of which is connected to a level gauge (8), a sewage discharge pressure transmitter (2) and a buffer pressure transmitter (4), respectively, and the output end of the automatic control system (12) is connected to a primary sewage discharge electric valve (1), a secondary sewage discharge electric valve (3), an inlet water electric valve (10), a sewage discharge endpoint control electric valve (6) and a variable frequency balance booster pump (9).

4. A wastewater discharge method for a soft drink sampling device, characterized in that, The wastewater discharge device for the soda sampling equipment according to claim 1 includes the following steps: When the sampling equipment starts to discharge sewage, the primary sewage discharge electric valve (1) is opened first. The sewage discharge pressure transmitter (2) displays the sewage discharge pressure of the buffer tank (7). The variable frequency balance booster pump (9) is started. The demineralized water in the buffer tank (7) flows back to the buffer tank (7) through the variable frequency balance booster pump (9) via the booster pump outlet check valve (11) and the pressure balance tank (5). The operating frequency of the variable frequency balance booster pump (9) is adjusted to control the flow rate of the variable frequency balance booster pump (9), thereby controlling the buffer pressure measured by the buffer pressure transmitter (4). When the difference between the buffer pressure measured by the buffer pressure transmitter (4) and the sewage discharge pressure measured by the sewage discharge pressure transmitter (2) is within the rated range, the secondary sewage discharge electric valve (3) is opened. At this time, the sewage discharged from the sampling equipment flows back to the buffer tank (7) together with the demineralized water through the pressure balance tank (5). The sewage discharge endpoint control electric valve (6) is opened to discharge the sewage discharged from the sampling equipment to the final wastewater discharge point.

5. The wastewater discharge method for the carbonated beverage sampling equipment according to claim 4, characterized in that, The side wall of the buffer tank (7) is equipped with a level gauge (8).

6. The wastewater discharge method for the carbonated beverage sampling equipment according to claim 5, characterized in that, Also includes: Before the sampling equipment starts discharging sewage, it determines whether the liquid level of the buffer tank (7) measured by the level gauge (8) is within the allowable operating liquid level range. When the liquid level of the buffer tank (7) is lower than the allowable operating liquid level range, the inlet electric valve (10) is opened to inject water into the buffer tank (7) so that the liquid level in the buffer tank (7) reaches the allowable operating liquid level range, and then the inlet electric valve (10) is automatically closed.

7. The wastewater discharge method for the carbonated beverage sampling equipment according to claim 4, characterized in that, When the sampling equipment finishes discharging sewage, close the secondary sewage discharge electric valve (3), then close the sewage discharge endpoint control electric valve (6) and the primary sewage discharge electric valve (1) in sequence, and then stop the operation of the variable frequency balance booster pump (9).

8. The wastewater discharge method for the carbonated beverage sampling equipment according to claim 4, characterized in that, The rated range is 0.1-0.3 MPa.

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