Drainage water recycling system
By designing a drainage water recycling system, the problems of pipeline damage and reduced heat exchange efficiency caused by steam pipeline condensate were solved by using spray cooling and purification treatment, thus achieving efficient recycling of drainage water and energy conservation and emission reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-04-14
AI Technical Summary
In existing technologies, condensate forms in long 0.5MPa steam pipelines, leading to pipeline damage and reduced heat exchange efficiency. Furthermore, the treatment of drainage water increases wastewater treatment costs and is not conducive to energy conservation and emission reduction.
Design a drainage water recycling system, including a plant-wide drainage water pipeline network, condensate tank, spray cooling device and demineralized water pipeline network, to achieve drainage water recycling through spray cooling and purification treatment.
It effectively cools and drains water, avoids pipe damage, improves heat exchange efficiency, reduces sewage treatment costs, and achieves energy conservation and emission reduction.
Smart Images
Figure CN224113324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drainage water recycling technology, and in particular to a drainage water recycling system. Background Technology
[0002] The plant's 0.5MPa steam mainly originates from the extraction steam from the thermal power turbine, the 1.5MPa-to-0.5MPa desuperheating and pressure reducing device, the gasification waste heat boiler, the conversion waste heat recovery unit, and the gas-water separation waste heat recovery unit. It is primarily used in thermal power air heaters, heat exchange stations, plant-wide heat tracing, deaerators, low-temperature methanol washing, refrigeration stations, phenol recovery, wastewater treatment, and flue gas desulfurization equipment. Due to the large number of equipment and devices involved in its production and use, the pipeline layout is complex and the pipelines are long. When the pipelines transporting 0.5MPa steam are long, condensate will form inside the pipelines. This condensate accumulates in the transport pipelines, forming water hammer and damaging pipelines, valves, and equipment. If the condensate (referred to by those skilled in the art as plant-wide drain water) enters the heat exchange equipment, it will affect the heat exchange efficiency of the heat exchangers. In existing technologies, a certain number of drains and steam traps are installed along a certain distance along the steam pipeline to discharge the condensate into the ditch. This method not only increases the cost of wastewater treatment but is also not conducive to energy conservation and emission reduction. Utility Model Content
[0003] The purpose of this invention is to provide a drainage water recycling system to solve the above-mentioned problems in the prior art.
[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0005] A drainage water recycling system includes a plant-wide drainage water network and a condensate tank connected to the plant-wide drainage water network via connecting pipes. The connecting pipes are equipped with a nozzle and a first valve in sequence. The system also includes a condensate network. A water pump is installed at the bottom of the condensate tank, and the outlet of the water pump is connected to the condensate network. A spray cooling device is connected to the top of the condensate tank.
[0006] The beneficial effects of this utility model are as follows: Before opening the first valve, the nozzle is opened to observe whether there are any foreign objects in the drain water, and a sample is taken for testing. If the test is qualified, the nozzle is closed, the first valve is opened, and the drain water enters the condensate tank. The condensate is sprayed by the spray cooling device to cool the drain water, and then it is transported to the condensate pipeline network. The condensate is purified according to actual needs to achieve the purpose of drain water recycling.
[0007] Based on the above technical solution, the present invention can be further improved as follows.
[0008] Furthermore, the spray cooling device includes a spray nozzle and a spray water pipe connected to the nozzle, as well as a demineralized water pipe network. The other end of the spray water pipe is connected to the demineralized water pipe network, and the spray nozzle is installed on the top of the condensate tank.
[0009] The further beneficial effect of the above is that by using demineralized water to cool the effluent, the condensate formed can be fed into the demineralized water station, where it can be simply treated to obtain high-quality demineralized water.
[0010] Furthermore, the spray nozzles are round shower heads.
[0011] The further beneficial effects of adopting the above are: the drainage water contains a large amount of steam, and using a round shower head can improve the cooling effect on the steam, which can effectively prevent the high-temperature steam from causing the pressure inside the condensate tank to rise rapidly.
[0012] Furthermore, a second valve is installed on the connecting pipeline, located upstream of the nozzle.
[0013] The further beneficial effects of adopting the above are: the second valve allows for precise control of the flow rate, facilitates observation of the water quality of the discharged water sprayed through the nozzle, and makes sampling and testing convenient.
[0014] Furthermore, a one-way valve is installed on the connecting pipeline, which is located between the nozzle and the first valve.
[0015] The further beneficial effect of adopting the above is that the drain water contains a large amount of steam, which can effectively prevent some of the drain water entering the condensate tank from flowing back into the connecting pipeline when the pressure inside the condensate tank is too high.
[0016] Furthermore, a T-junction is installed between the plant's drainage network and the connecting pipelines. The first port of the T-junction is connected to the connecting pipeline, the second port is connected to the plant's drainage network through the first pipeline, the first pipeline is equipped with a drainage high-point air vent valve, and the third port is connected to the plant's drainage network through the second pipeline, the second pipeline is equipped with a drainage inlet valve.
[0017] The further beneficial effects of adopting the above are: the high-point exhaust valve and the drain water inlet valve are connected in parallel, which can discharge the gas in the pipeline, ensure the smooth flow of fluid in the pipeline, avoid the problem of reduced flow and increased energy consumption caused by gas blockage, and thus improve the operating efficiency of the entire system. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a drainage water recycling system according to the present invention.
[0019] The attached diagram lists the components represented by each number as follows:
[0020] 1. Plant-wide drainage network; 11. Connecting pipes; 111. Sprayer head; 112. First valve; 113. Second valve; 114. Check valve; 12. T-pipe; 13. First pipeline; 131. High-point vent valve; 14. Second pipeline; 141. Drainage inlet valve; 15. Low-point condensate drain valve; 2. Condensate tank; 21. Water pump; 23. Spray cooling device; 231. Spray nozzle; 232. Spray water pipe; 3. Condensate network; 4. Demineralized water network. Detailed Implementation
[0021] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0022] Example 1
[0023] like Figure 1 As shown, a drainage water recycling system includes a plant-wide drainage water network 1 and a condensate tank 2 connected to the plant-wide drainage water network 1 via a connecting pipe 11. The connecting pipe 11 is sequentially equipped with a nozzle 111 and a first valve 112. It also includes a condensate water network 3. A water pump 21 is provided at the bottom of the condensate tank 2, and the outlet of the water pump 21 is connected to the condensate water network 3. A spray cooling device 23 is connected to the top of the condensate tank 2.
[0024] Before opening the first valve 112, open the nozzle 111 to observe whether there are any foreign objects in the drain water and take a sample for testing. If the test is qualified, close the nozzle 111 and open the first valve 112. The drain water enters the condensate tank 12 and is cooled by spraying condensate through the spray cooling device 23. Then it is transported to the condensate pipeline 3. The condensate is purified according to actual needs to achieve the purpose of drain water recycling.
[0025] Example 2
[0026] This embodiment is a further improvement on embodiment 1, as detailed below:
[0027] The spray cooling device 23 includes a spray nozzle 231, a spray water pipe 232 connected to the spray nozzle 231, and a demineralized water pipe network 4. The other end of the spray water pipe 232 is connected to the demineralized water pipe network 4, and the spray nozzle 231 is installed on the top of the condensate tank 2.
[0028] The condensate formed by cooling the discharged water with demineralized water enters the demineralized water station, where it only requires simple treatment to obtain high-quality demineralized water.
[0029] Spray head 231 is a round shower head; the drain water contains a large amount of steam, and using a round shower head can improve the cooling effect of the steam, which can effectively prevent the pressure in the condensate tank 2 from rising rapidly due to high temperature steam.
[0030] Example 3
[0031] This embodiment is a further improvement on embodiment 2, as detailed below:
[0032] A second valve 113 is also installed on the connecting pipeline, located upstream of the nozzle 111. The second valve 113 allows for precise flow control, facilitates observation of the water quality of the drained water sprayed through the nozzle 111, and enables convenient sampling and testing. A one-way valve 114 is also installed on the connecting pipeline, located between the nozzle and the first valve. The drained water contains a large amount of steam; when the pressure inside the condensate tank 2 is too high, this valve effectively prevents some of the drained water entering the condensate tank 2 from flowing back into the connecting pipeline 11.
[0033] Example 4
[0034] This embodiment is a further improvement on any one of embodiments 1 to 3, as detailed below:
[0035] A tee pipe 12 is provided between the plant's drainage network 1 and the connecting pipe 11. The first port of the tee pipe 12 is connected to the connecting pipe 11, and the second port is connected to the plant's drainage network 1 through the first pipe 13. A drainage high-point air vent valve 131 is provided on the first pipe 13. The third port is connected to the plant's drainage network 1 through the second pipe 14. A drainage inlet valve 141 is provided on the second pipe 14.
[0036] The high-point exhaust valve 131 is connected in parallel with the drain water inlet valve 141, which can discharge the gas in the pipeline, ensure the smooth flow of fluid in the pipeline, avoid the problem of reduced flow and increased energy consumption caused by gas blockage, and thus improve the operating efficiency of the entire system.
[0037] A low-point condensate drain valve 15 is installed at the lowest point of the plant's drainage network 1. Residual drainage water in the plant's drainage network 1 is periodically discharged.
[0038] The condensate piping network 3, connecting pipe 11, first pipe 13, and second pipe 14 all use DN200 spiral steel pipes. The use of DN200 spiral steel pipes has high strength and good toughness, and the material of DN200 spiral steel pipes is Q235B, which is easy to weld, reducing the risk of water leakage and effectively reducing the maintenance cost of the pipeline.
[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A drain water recycling system characterized by, It includes a whole plant drainage network (1) and a condensate tank (2) connected to the whole plant drainage network (1) via a connecting pipe (11). The connecting pipe (11) is provided with a nozzle (111) and a first valve (112) in sequence. It also includes a condensate network (3). A water pump (21) is provided at the bottom of the condensate tank (2). The outlet of the water pump (21) is connected to the condensate network (3). A spray cooling device (23) is connected to the top of the condensate tank (2).
2. The drain water recycling system of claim 1, wherein The spray cooling device (23) includes a spray nozzle (231), a spray water pipe (232) connected to the spray nozzle (231), and a demineralized water pipe network (4). The other end of the spray water pipe (232) is connected to the demineralized water pipe network (4). The spray nozzle (231) is installed on the top of the condensate tank (2).
3. The drain water recycling system of claim 2, wherein, The spray nozzle (231) is a circular shower head.
4. The drain water recycling system of claim 3, wherein The connecting pipe (11) is also provided with a second valve (113), which is located upstream of the nozzle (111).
5. The drain water recycling system of claim 4, wherein, The connecting pipe (11) is provided with a one-way valve (114), which is located between the nozzle (111) and the first valve (112).
6. The drain water recycling system according to any one of claims 1 to 5, wherein A three-way pipe (12) is provided between the plant drainage network (1) and the connecting pipe (11). The first interface of the three-way pipe (12) is connected to the connecting pipe (11), and the second interface is connected to the plant drainage network (1) through the first pipe (13). A drainage high-point air vent valve (131) is provided on the first pipe (13), and the third interface is connected to the plant drainage network (1) through the second pipe (14). A drainage inlet valve (141) is provided on the second pipe (14).
7. The drain water recycling system of claim 6, wherein, The lowest point of the plant’s drainage network (1) is equipped with a low-point condensate drain valve (15).
8. The drain water recycling system of claim 6, wherein, The condensate pipeline (3), the connecting pipeline (11), the first pipeline (13) and the second pipeline (14) are all made of DN200 spiral steel pipe.