Water vapor sampling and water recycling system for thermal power plant

Abstract

The utility model provides a kind of thermal power plant water vapor sampling sample water recycling system, including water vapor pipe end group, water vapor pipe end group is sequentially connected with filter heat exchange group, water taking monitoring group, recovery water storage group and acid-base neutralization group, acid-base neutralization group is finally connected with circulating water distribution group, circulating water distribution group is used to distribute water meeting circulation to water using unit, the output information of monitoring table in water taking monitoring group is finally sent to DCS system by electric signal, monitoring personnel controls all monitoring table by DCS system, steam water sampling device sample water is recovered to condenser hot water well, using sample water recovery device, for the artificial sampling of remaining each sample water and the unified collection of on-line instrument drainage to sample water recovery tank, and after recovery, water quality is re-neutralized, and the water after neutralization is directly recycled in circulating water distribution system, to achieve the purpose of energy saving and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of water reuse, and in particular to a water reuse system for water vapor sampling in thermal power plants. Background Technology

[0002] This project aims to study how to recover water samples from steam-water sampling devices in power plants and return them to the condenser, instead of discharging them to wastewater treatment equipment as is the conventional design. This will achieve the goal of water resource recycling and reuse, reduce enterprise costs, lower overall plant water consumption, and achieve energy conservation and environmental protection.

[0003] The water sample from the steam and water sampling device is recycled to the hot water well of the condenser and implemented according to the principle of classified utilization. The drainage from the online silicon meter and the online sodium meter is led out separately. At the same time, a water sample recovery device is used to collect the manual sampling of the remaining water samples and the drainage from the online instruments into the water sample recovery tank. After recovery, the water quality is re-neutralized, and the neutralized water enters the circulating water distribution system for direct recycling. Therefore, a system is needed that can sample water vapor from thermal power plants and reuse the sampled water. Utility Model Content

[0004] The main objective of this invention is to provide a water sampling and reuse system for thermal power plants, which enables the neutralization and reuse of water samples in existing water sampling and reuse systems.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a water and steam sampling and water reuse system for thermal power plants, including a water and steam pipe end group, which is sequentially connected to a filtration and heat exchange group, a water intake monitoring group, a water recovery and storage group, and an acid-base neutralization group. The acid-base neutralization group is finally connected to a circulating water distribution group. The circulating water distribution group is used to distribute water that meets the requirements of circulation to water-using units. The output information of the monitoring meters in the water intake monitoring group is finally transmitted to the DCS system through electrical signals. The monitoring personnel monitor all monitoring meters through the DCS system. The filter heat exchanger is equipped with a cooling water outlet pipe and a cooling water inlet pipe on one side. The cooling water outlet pipe and the cooling water inlet pipe are used to circulate condensate. A thermostat is also provided on one side of the cooling water outlet pipe and the cooling water inlet pipe. The thermostat outlet pipe of the thermostat is connected to the cooling water inlet pipe, and the thermostat inlet pipe of the thermostat is connected to the cooling water inlet pipe. The thermostat is used to maintain the temperature of the circulating condensate.

[0006] In the preferred embodiment, the filtration and heat exchange group includes a filter group and a heat exchanger group. The filter group includes multiple filters, and a valve is provided between the filter and the cooling water outlet pipe. The valve is used to control the passage between the filter and the cooling water outlet pipe.

[0007] In the preferred embodiment, the cooling water outlet pipe is also equipped with a branch pipe to distribute the water to the first water storage tank, which is used to share the circulating water pressure of the cooling water outlet pipe.

[0008] In the preferred embodiment, the heat exchanger group is used to reduce the temperature of the water vapor passing through the filter, and multiple pressure detection groups are also provided after the heat exchanger group; The pressure detection group includes a pressure gauge, and a second valve is installed in front of the pressure gauge. The second valve is a manual pressure reducing valve.

[0009] In the preferred embodiment, valves three and four are respectively installed on the cooling water outlet pipe and the cooling water inlet pipe. When both valves three and four are closed, the thermostatic device directly circulates the condensate to keep the circulating condensate at a constant temperature.

[0010] In the preferred embodiment, the water intake monitoring group includes a spillway protection group and a temperature detection group. The spillway protection group includes a safety valve, and the outlet pipe of the safety valve is connected to the second water storage tank. The second water storage tank is used to hold the water overflowing from the safety valve.

[0011] In the preferred embodiment, the temperature detection group includes multiple temperature detectors, a temperature controller is provided on one side of each temperature detector, and a constant temperature device is provided between the temperature detectors.

[0012] In the preferred embodiment, temperature detectors are distributed at the inlet and outlet of the thermostat. The temperature detectors are used to detect whether the water flowing through the thermostat in the main pipe reaches the preset temperature. If the temperature is not reached, the preset temperature of the thermostat is adjusted in real time by the temperature controller.

[0013] In the preferred embodiment, the water recovery storage group includes a water recovery tank, a level gauge is provided on one side of the water recovery tank, and an overflow pipe is provided on the other side of the water recovery tank, which is connected to the overflow pool.

[0014] In the preferred embodiment, a valve five is also provided on one side of the bottom of the recycling water tank. The valve five is used to manually lower the liquid level in the recycling water tank. A water meter is provided on the other side of the recycling water tank. The water meter is used to monitor the water flow rate sent out by the recycling water tank. An acid-base neutralization group is also provided on one side of the water meter. The output end of the acid-base neutralization group is connected to the circulating water distribution system. This utility model provides a water sampling and water reuse system for thermal power plants, which has the following beneficial effects: 1. This utility model recovers the sample water from the steam and water sampling device to the condenser hot water well, and is implemented according to the principle of classified utilization. The drainage from the online silicon meter and the online sodium meter is led out separately. At the same time, a sample water recovery device is used to collect the manual sampling of the remaining sample water and the drainage from the online instruments into the sample water recovery tank. After recovery, the water quality is re-neutralized. The neutralized water enters the circulating water distribution system for direct recycling, thereby achieving the purpose of energy saving and environmental protection.

[0015] 2. The neutralization tank has branch pipes arranged from top to bottom on its side wall. Together with the mixing motor at the top, it drives the stirring section to ensure that the sample water and neutralizing agent are fully mixed, ensuring uniform neutralization and avoiding local acid-base imbalance. The components are connected in sequence to form a complete treatment process. The sample water is filtered, heat exchanged, monitored, and then precisely neutralized. Finally, it is discharged or recycled in a reasonable manner through the circulating water distribution group, taking into account both treatment effect and environmental protection requirements, and improving the practicality and reliability of sample water recycling and treatment after water and steam sampling in power plants. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a pipeline diagram of the water vapor pipe end assembly for water reuse in this utility model. Figure 2 This is a pipeline diagram of the water sampling and monitoring group for water reuse in this utility model. Figure 3 This is a piping diagram of the filter assembly of this utility model; Figure 4 This is the piping diagram of the heat exchanger assembly of this utility model; Figure 5 This is the piping diagram of the leakage protection assembly of this utility model; Figure 6 This is a schematic diagram of the layout of the water sampling sensor of this utility model; Figure 7 This is a pipeline diagram of the water recovery and storage unit of this utility model.

[0017] In the diagram: Steam pipe end group 1; Condensate outlet 101; Fine treatment chemical dosing outlet 102; Deaerator outlet 103; Economizer outlet 104; Main steam outlet 105; Reheat steam outlet 106; Start-up separator side outlet 107; Start-up separator outlet 108; High-pressure heater condensate outlet 109; Air heater outlet 110; Auxiliary machine cooling outlet 111; Low-pressure heater condensate outlet 112; Generator outlet 113; Filtration heat exchange group 2; Filter group 201; Filter 2011; Valve 1 2012; Water storage tank 1 202; Cooling water outlet pipe 2021; Cooling water inlet pipe 2022; Heat exchanger group 203; Pressure detection group 204; Valve 2041; Pressure gauge 2042; Valve 3 205; Valve 4 206; Water intake monitoring group 3; Leakage protection group 301; Safety valve 3011; Temperature detection group 302; Temperature monitor 3021; ​​Temperature controller 3022; Flow monitor 3023; Thermostatic device 303; Thermostatic inlet pipe 3031; Thermostatic outlet pipe 3032; Sampling pipeline 30; Specific conductivity meter 31; Dissolved oxygen meter 32; Hydrogen conductivity meter 33; pH meter 34; Silicon meter 35; Sodium meter 36; Water storage tank 2 304; Recycled water storage group 4; Recycled water tank 401; Overflow tank 402; Valve 5 403; Liquid level gauge 404; Water meter 405; Overflow pipe 406; Acid-base neutralization group 5. Detailed Implementation

[0018] Example 1 like Figure 1-7 As shown, a water sampling and reuse system for a thermal power plant includes a water pipe end group 1, which is sequentially connected to a filtration and heat exchange group 2, a water intake monitoring group 3, a water recovery and storage group 4, and an acid-base neutralization group 5. The acid-base neutralization group 5 is finally connected to a circulating water distribution group 6, which is used to distribute water that meets the requirements of circulation to water-using units. The output information of the monitoring meters in the water intake monitoring group 3 is finally transmitted to the DCS system via electrical signals, and the monitoring personnel monitor all monitoring meters through the DCS system. The filter heat exchange group 2 is provided with a cooling water outlet pipe 2022 and a cooling water inlet pipe 2021 on one side. The cooling water outlet pipe 2022 and the cooling water inlet pipe 2021 are used to circulate condensate. A thermostatic device 303 is also provided on one side of the cooling water outlet pipe 2022 and the cooling water inlet pipe 2021. The thermostatic outlet pipe 3032 of the thermostatic device 303 is connected to the cooling water inlet pipe 2021, and the thermostatic inlet pipe 3031 of the thermostatic device 303 is connected to the cooling water inlet pipe 2022. The thermostatic device 303 is used to maintain the temperature of the circulating condensate.

[0019] In the preferred embodiment, the filtration heat exchange group 2 includes a filter group 201 and a heat exchanger group 203. The filter group 201 includes multiple filters 2011. A valve 2012 is also provided between the filter 2011 and the cooling water outlet pipe 2022. The valve 2012 is used to control the passage between the filter 2011 and the cooling water outlet pipe 2022.

[0020] In the preferred embodiment, the cooling water outlet pipe 2022 is also provided with a branch pipe to the water storage tank 202, which is used to share the circulating water pressure of the cooling water outlet pipe 2022.

[0021] In the preferred embodiment, the heat exchanger group 203 is used to reduce the temperature of water vapor passing through the filter 2011, and multiple pressure detection groups 204 are also provided after the heat exchanger group 203. The pressure detection group 204 includes a pressure gauge 204, and a valve 2041 is installed in front of the pressure gauge 204. The valve 2041 is a manual pressure reducing valve.

[0022] In the preferred embodiment, valve 205 (three) and valve 206 (four) are respectively installed on the cooling water outlet pipe 2022 and the cooling water inlet pipe 2021. When valves 205 (three) and 206 (four) are closed, the thermostatic device 303 directly circulates the condensate to keep the circulating condensate at a constant temperature.

[0023] In the preferred embodiment, the water intake monitoring group 3 includes a spillway protection group 301 and a temperature detection group 302. The spillway protection group 301 includes a safety valve 3011. The outlet pipe of the safety valve 3011 is connected to the second water storage tank 304. The second water storage tank 304 is used to carry the water overflowing from the safety valve 3011.

[0024] In the preferred embodiment, the temperature detection group 302 includes multiple temperature detectors 3021, a temperature controller 3022 is provided on one side of the temperature detectors 3021, and a constant temperature device 303 is provided between the temperature detectors 3021.

[0025] In the preferred embodiment, temperature detectors 3021 are distributed at the inlet and outlet of the thermostat 303. Temperature detectors 3021 are used to detect whether the water in the main pipe reaches the preset temperature when it flows through the thermostat 303. If the temperature is not reached, the preset temperature of the thermostat 303 is adjusted in real time by the temperature controller 3022.

[0026] In the preferred embodiment, the water recovery storage group 4 includes a water recovery tank 401, a level gauge 404 is provided on one side of the water recovery tank 401, and an overflow pipe 406 is provided on the other side of the water recovery tank 401, which is connected to the overflow pool 402.

[0027] In the preferred embodiment, a valve 403 is provided on one side below the recovery water tank 401. The valve 403 is used to manually lower the liquid level in the recovery water tank 401. A water meter 405 is provided on the other side of the recovery water tank 401. The water meter is used to monitor the water flow rate sent out by the recovery water tank 401. An acid-base neutralization group 5 is also provided on one side of the water meter 405. The output end of the acid-base neutralization group 5 is connected to the circulating water distribution system 6.

[0028] Example 2 Further explanation based on Example 1: The steam-water pipe end assembly 1 includes a condensate outlet 101, a fine treatment chemical dosing outlet 102, a deaerator outlet 103, an economizer outlet 104, a main steam outlet 105, a reheat steam outlet 106, a start-up separator side outlet 107, a start-up separator outlet 108, a high-pressure heater drain outlet 109, a heater outlet 110, an auxiliary machine cooling outlet 111, a low-pressure heater drain outlet 112, and a generator outlet 113. The sample water instruments corresponding to each water vapor pipe end are shown in the table below:

[0029] As shown in the diagram above, high-temperature, high-pressure water and steam samples pass through water-steam pipe end group 1 to the filtration and heat exchange group 2. After cooling, the water sample becomes 25°C. It then passes through the constant temperature device (25±0.1°C) in the water sampling and monitoring group 3 before entering online instruments such as sodium meters, silicon meters, conductivity meters, dissolved oxygen meters, and pH meters (meters with values ​​30 to 36) for online monitoring. After the water sample is measured by the online instruments, it finally reaches the recovery and storage group 4 and is discharged into the [unclear - possibly a specific water source]. Figure 6 In the collection tank shown.

[0030] The process leads to a manual sampling point for easy manual sampling and analysis. Each manual sample is approximately 500ml, with 6-12 samples collected daily over 24 hours. The remaining water samples are discharged into the drainage ditch. Water samples are continuously supplied at a flow rate of 500-700ml / min. Online instruments continuously monitor and display boiler steam and water quality. Manual sampling is compared with online instrument readings to ensure the accuracy of the online instruments and to provide supplementary monitoring in case of instrument malfunction.

[0031] However, regardless of whether the water samples are taken manually or supplied to instruments, most thermal power plants do not classify and recycle the water samples from the steam and water sampling devices. This results in a large amount of high-quality water with low salt content being discharged into the wastewater collection system along with cooling water and sewage. Ultimately, this water is treated as industrial wastewater, which increases the load on wastewater treatment equipment and the amount of chemicals required. This wastes money and is not conducive to energy conservation, emission reduction, and environmental protection.

[0032] In this scheme, the sampled water with good water quality and low salt content, along with the cooling water and sewage, are collected again into the recycling water storage group 4. After acid and alkali neutralization, the water is returned to the circulating water distribution system 7 and reused for irrigation or toilet use.

[0033] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A water sampling and reuse system for steam and water in a thermal power plant, characterized in that: It includes a water vapor pipe end group (1), which is connected in sequence to a filtration heat exchange group (2), a water intake monitoring group (3), a water recovery storage group (4), and an acid-base neutralization group (5). The acid-base neutralization group (5) is finally connected to a circulating water distribution group (6). The circulating water distribution group (6) is used to distribute water that meets the requirements of circulation to water-using units. The output information of the monitoring meter in the water intake monitoring group (3) is finally transmitted to the DCS system through an electrical signal. The monitoring personnel monitor all monitoring meters through the DCS system. The filter heat exchange group (2) is provided with a cooling water outlet pipe (2021) and a cooling water inlet pipe (2022) on one side. The cooling water outlet pipe (2021) and the cooling water inlet pipe (2022) are used to circulate condensate. A thermostat (303) is also provided on one side of the cooling water outlet pipe (2021) and the cooling water inlet pipe (2022). The thermostat outlet pipe (3032) of the thermostat (303) is connected to the cooling water inlet pipe (2022), and the thermostat inlet pipe (3031) of the thermostat (303) is connected to the cooling water inlet pipe (2022). The thermostat (303) is used to maintain the temperature of the circulating condensate.

2. The water sampling and reuse system for steam and water in a thermal power plant according to claim 1, characterized in that: The filtration and heat exchange group (2) includes a filter group (201) and a heat exchanger group (203). The filter group (201) includes multiple filters (2011). A valve (2012) is also provided between the filter (2011) and the cooling water outlet pipe (2021). The valve (2012) is used to control the passage between the filter (2011) and the cooling water outlet pipe (2021).

3. The water sampling and reuse system for steam and water in a thermal power plant according to claim 2, characterized in that: cooling water... The outlet pipe (2021) is also equipped with a branch pipe to distribute the water to the first water storage tank (202), which is used to share the circulating water pressure of the cooling water outlet pipe (2021).

4. A water sampling and reuse system for steam and water in a thermal power plant according to claim 2, characterized in that: a heat exchanger Group (203) is used to reduce the temperature of water vapor passing through filter (2011), and multiple pressure detection groups (204) are provided after heat exchanger group (203). The pressure detection group (204) includes a pressure gauge (2042), and a valve two (2041) is provided in front of the pressure gauge (2042). The valve two (2041) is a manual pressure reducing valve.

5. The water sampling and reuse system for steam and water in a thermal power plant according to claim 1, characterized in that: The cooling water outlet pipe (2021) and cooling water inlet pipe (2022) are also equipped with valve three (205) and valve four (206) respectively. When valve three (205) and valve four (206) are closed, the thermostatic device (303) directly circulates the condensate to keep the circulating condensate at a constant temperature.

6. The water sampling and reuse system for steam and water in a thermal power plant according to claim 1, characterized in that: The water intake monitoring group (3) includes a spillway protection group (301) and a temperature detection group (302). The spillway protection group (301) includes a safety valve (3011). The outlet pipe of the safety valve (3011) is connected to the second water storage tank (304). The second water storage tank (304) is used to carry the water overflowing from the safety valve (3011).

7. A water sampling and reuse system for steam and water in a thermal power plant according to claim 6, characterized in that: The temperature detection group (302) includes multiple temperature detectors (3021), a temperature controller (3022) is provided on one side of the temperature detectors (3021), and a constant temperature device (303) is provided between the temperature detectors (3021).

8. The water sampling and reuse system for steam and water in a thermal power plant according to claim 1, characterized in that: Temperature detectors (3021) are distributed at the inlet and outlet of the thermostat (303). The temperature detectors (3021) are used to detect whether the water in the main pipe reaches the preset temperature when it passes through the thermostat (303). If the temperature is not reached, the preset temperature of the thermostat (303) is adjusted in real time by the temperature controller (3022).

9. A water sampling and reuse system for steam and water in a thermal power plant according to claim 1, characterized in that: The water recovery storage group (4) includes a water recovery tank (401), a level gauge (404) is provided on one side of the water recovery tank (401), and an overflow pipe (406) is provided on the other side of the water recovery tank (401). The overflow pipe (406) is connected to the overflow pool (402).

10. A water sampling and reuse system for steam and water in a thermal power plant according to claim 9, characterized in that: A valve five (403) is also provided on one side below the recycling water tank (401). The valve five (403) is used to manually lower the liquid level in the recycling water tank (401). A water meter (405) is provided on the other side of the recycling water tank (401). The water meter is used to monitor the water flow rate sent out by the recycling water tank (401). An acid-base neutralization group (5) is also provided on one side of the water meter (405). The output end of the acid-base neutralization group (5) is connected to the circulating water distribution group (6).

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