Water affair system of gas turbine power plant

Abstract

The utility model relates to the technical field of water treatment, and discloses a water system of a gas turbine power plant, which comprises a raw water tank, a raw water pretreatment system, a first water tank, an ultrafiltration system, a second water tank, a primary reverse osmosis system, a secondary reverse osmosis system and a fresh water tank, the output end of the primary reverse osmosis system is connected with a concentrated water reverse osmosis system, and the output end of the concentrated water reverse osmosis system is respectively connected with an evaporation pond and a fresh water tank; the output end of the secondary reverse osmosis system is connected with a second water tank; the raw water pretreatment system, the ultrafiltration system, the first-stage reverse osmosis system and the second-stage reverse osmosis system are used for treating wastewater step by step, the first water tank, the second water tank and the fresh water tank are respectively used for storing different treated water, and the evaporation pond is used for storing tail-end wastewater; the tail end wastewater is naturally evaporated in the evaporation pond, remaining solid salt crystals are treated, the wastewater amount is reduced through the evaporation pond and the multiple filtering devices, the wastewater is treated through natural evaporation of the evaporation pond, and discharge of the wastewater is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a water system of a gas turbine power plant. Background Art

[0002] A gas turbine power plant, also known as a gas power plant, is a cycle system composed of a gas turbine, a generator, a waste heat boiler, and a steam turbine. It converts the high-temperature waste flue gas discharged from the gas turbine into steam through the waste heat boiler, and then injects the steam into the steam turbine for power generation. With the development of gas turbine technology, the change of the national energy structure, and the improvement of environmental protection requirements, the development of gas turbine power plants is bound to be greatly accelerated.

[0003] However, many problems have been encountered in the development process of gas turbine power plants, especially in terms of environmental protection. Due to the gradual improvement of current environmental protection requirements, the requirements for the water system of gas turbine power plants are also gradually increasing, especially the requirement of zero wastewater discharge, which poses higher requirements for the terminal wastewater treatment of gas turbine power plants. However, gas turbine power plants are different from traditional coal-fired power plants. The commonly used zero wastewater discharge processes in coal-fired power plants, such as flue gas evaporation, are very limited in the use of gas turbine power plants.

[0004] The current zero wastewater discharge process of gas turbine power plants is explored on the basis of learning from the zero wastewater discharge process at the end of coal-fired units, but there is still no good way to better meet the requirement of zero wastewater discharge. The wastewater treatment system of gas turbine power plants needs to be redesigned and planned to meet the standard of zero wastewater discharge. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: how to achieve zero wastewater discharge in gas turbine power plants. To solve the above technical problem, the utility model provides a water system of a gas turbine power plant, which includes a raw water tank, a raw water pretreatment system, a first water tank, an ultrafiltration system, a second water tank, a first-stage reverse osmosis system, a second-stage reverse osmosis system, and a fresh water tank connected in sequence;

[0006] The output end of the first-stage reverse osmosis system is also connected to a concentrated water reverse osmosis system, which is used to receive the concentrated water output by the first-stage reverse osmosis system. The output end of the concentrated water reverse osmosis system is respectively connected to an evaporation pond and the fresh water tank;

[0007] The output end of the second-stage reverse osmosis system is also connected to the second water tank;

[0008] Among them, the raw water pretreatment system, the ultrafiltration system, the first-stage reverse osmosis system, and the second-stage reverse osmosis system are used to treat wastewater step by step. The first water tank, the second water tank, and the fresh water tank are respectively used to store the treated water generated in different treatment processes of wastewater, and the evaporation pond is used to store the terminal wastewater.

[0009] Preferably, the output end of the fresh water tank is connected to an ED I device, and the output ends of the ED I device are respectively connected to a desalted water tank and the second water tank.

[0010] Preferably, the output end of the raw water pretreatment system is also connected to a sludge treatment system, and the output end of the sludge treatment system is respectively connected to a sludge transfer device and the raw water pretreatment system.

[0011] Preferably, it also includes an oily wastewater treatment system, the input end of the oily wastewater treatment system is used to receive oily wastewater, and the output end of the oily wastewater treatment system is respectively connected to the raw water pretreatment system and the evaporation pond.

[0012] Preferably, the output end of the evaporation pond is connected to an external treatment device, and the input end of the evaporation pond is also connected to a laboratory wastewater output device.

[0013] Preferably, the output end of the first water tank is also connected to an industrial fire-fighting water device.

[0014] Preferably, the input end of the raw water tank is connected to a raw water output device, a boiler drainage output device and an iron removal filter backwash water output device, wherein the iron removal filter is used to process boiler condensate;

[0015] A first water supply pump is provided at the output end of the raw water pool, and the output end of the first water supply pump is connected to the raw water pretreatment system.

[0016] Preferably, a second water supply pump is provided between the first water tank and the ultrafiltration system, and a third water supply pump is provided between the second water tank and the primary reverse osmosis system.

[0017] Compared with the prior art, the water system of a gas turbine power plant provided in the embodiment of the utility model has the following beneficial effects:

[0018] In the present invention, raw water and recyclable waste water are processed together by a raw water pretreatment system, and then are subjected to multiple filtration treatments by an ultrafiltration system, a primary reverse osmosis system and a secondary reverse osmosis system, wherein the concentrated water produced in the primary reverse osmosis system is discharged into the concentrated water reverse osmosis system for further filtration treatment, and the treated water produced by the concentrated water reverse osmosis system and the secondary reverse osmosis system is collected in a fresh water tank for use or further treatment, and the concentrated water discharged from the concentrated water reverse osmosis system is transported to an evaporation pond for natural evaporation, and a large amount of salt substances remaining after the terminal waste water in the evaporation pond is evaporated are transported out for unified treatment. The present invention reduces the amount of waste water by setting up an evaporation pond and multiple filtration devices, and also utilizes the natural evaporation of the evaporation pond to convert the waste water into solid salt crystal waste, thereby avoiding the discharge of waste water. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the system flow of the present utility model.

[0020] In the figure: 1, raw water tank; 11, raw water output device; 12, boiler drainage output device; 13, backwash water output device of the iron removal filter; 14, first feed water pump;

[0021] 2, raw water pretreatment system; 21, sludge treatment system; 211, sludge transfer device; 22, first water tank; 221, industrial fire fighting water device; 23, second feed water pump;

[0022] 3, ultrafiltration system; 31, second water tank; 32, third feed water pump;

[0023] 4, first-stage reverse osmosis system; 5, second-stage reverse osmosis system;

[0024] 6, fresh water tank; 61, EDI device; 62, demineralized water tank;

[0025] 7, concentrated water reverse osmosis system;

[0026] 8, evaporation pond; 81, external treatment device; 82, laboratory wastewater output device;

[0027] 9, oily wastewater treatment system. Detailed Embodiments

[0028] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0029] As Figure 1 shown, the preferred embodiment of the present utility model provides a water treatment system for a gas turbine power plant, which includes a raw water tank 1, a raw water pretreatment system 2, a first water tank 22, an ultrafiltration system 3, a second water tank 31, a first-stage reverse osmosis system 4, a second-stage reverse osmosis system 5, and a fresh water tank 6 connected in sequence according to the output direction;

[0030] The output end of the first-stage reverse osmosis system 4 is also connected to a concentrated water reverse osmosis system 7. The concentrated water reverse osmosis system 7 is used to receive the concentrated water output by the first-stage reverse osmosis system 4. The output end of the concentrated water reverse osmosis system 7 is respectively connected to an evaporation pond 8 and a fresh water tank 6;

[0031] The output end of the second-stage reverse osmosis system 5 is also connected to the second water tank 31;

[0032] Among them, the raw water pretreatment system 2, the ultrafiltration system 3, the first-stage reverse osmosis system 4 and the second-stage reverse osmosis system 5 are used to treat the wastewater step by step. The first water tank 22, the second water tank 31 and the fresh water tank 6 are respectively used to store the treated water generated during different treatment processes of the wastewater, and the evaporation pond 8 is used to store the end wastewater.

[0033] Specifically, in the present utility model, the raw water tank 1 can receive and store the raw water and various recyclable wastewater. The raw water and wastewater stored in the raw water tank 1 can be transported to the raw water pretreatment system 2. The raw water pretreatment system 2 can preliminarily treat the mixed water of the wastewater and the raw water, remove the suspended solids and colloids in the mixed water, and also reduce the hardness of the water body. The treated water after being treated by the raw water pretreatment system 2 is transported to the first water tank 22 for storage. The ultrafiltration system 3 can obtain the treated water stored in the first water tank 22 and perform filtration treatment. The treated water after being treated by the ultrafiltration system 3 is output to the second water tank 31. The treated water in the second water tank 31 can be transported to the first-stage reverse osmosis system 4 for filtration treatment. The first-stage reverse osmosis system 4 transports the treated water to the second-stage reverse osmosis system 5 and inputs the concentrated water obtained after treatment into the concentrated water reverse osmosis system 7. The second-stage reverse osmosis system 5 further filters the treated water transported by the first-stage reverse osmosis system 4 and inputs the filtered treated water into the fresh water tank 6. The concentrated water reverse osmosis system 7 further filters the concentrated water output by the first-stage reverse osmosis system 4, inputs the generated treated water into the fresh water tank 6 for subsequent treatment or use, and outputs the concentrated water generated after further filtering the concentrated water to the evaporation pond 8. The evaporation pond 8 collects and stores the end wastewater after being filtered and concentrated multiple times. The wastewater evaporates in the natural environment, leaving solid salt crystals. Subsequently, the solid salt crystals are uniformly transported away for treatment, thus realizing zero discharge of the wastewater.

[0034] The output end of the secondary reverse osmosis system 5 is also connected to the second water tank 31. After the secondary reverse osmosis system 5 processes the treated water transported by the primary reverse osmosis system 4, on the one hand, it will produce new treated water and output it into the fresh water tank 6. On the other hand, it will also produce concentrated water. In this utility model, this part of the concentrated water is transported into the second water tank 31, mixed with the treated water in the second water tank 31, and then filtered again by the primary reverse osmosis system 4. Through the cyclic filtration among the second water tank 31, the primary reverse osmosis system 4, and the secondary reverse osmosis system 5, the concentration of various ions and pollutants in the concentrated water can be further increased, the efficiency of wastewater treatment can be improved, the output of wastewater can be reduced, the treatment pressure on the evaporation pond 8 can be avoided from being too large, and the wastewater in the evaporation pond 8 can be quickly evaporated to form solid salt crystal waste. In some other embodiments, the output end of the secondary reverse osmosis system 5 can be connected to a concentrated water reverse osmosis system 7, and then the concentrated water produced by the secondary reverse osmosis system 5 is directly input into the concentrated water reverse osmosis system 7 for further filtration treatment.

[0035] In some embodiments, the output end of the fresh water tank 6 is connected to an EDI device 61, and the output end of the EDI device 61 is respectively connected to a demineralized water tank 62 and the second water tank 31.

[0036] Specifically, the treated water in the fresh water tank 6 still cannot be used in some scenarios and needs to be further treated. In this embodiment, the output end of the fresh water tank 6 is connected to an EDI device 61 (continuous electrodeionization device 61). The EDI device 61 can further desalt the treated water in the fresh water tank 6. The treated fresh water is then input into the demineralized water tank 62, and the produced concentrated water is input into the second water tank 31 for re-treatment by the primary reverse osmosis system 4, and is transported into the concentrated water reverse osmosis system 7, and finally enters the evaporation pond 8 to form solid salt crystals and be treated.

[0037] In some embodiments, the output end of the raw water pretreatment system 2 is also connected to a sludge treatment system 21, and the output end of the sludge treatment system 21 is respectively connected to a sludge transfer device 211 and the raw water pretreatment system 2.

[0038] Specifically, in the raw water pretreatment system 2, different water purification processes can be adopted according to the different impurities contained in the raw water and wastewater. Among them, the sludge method can be used to treat the mixed wastewater in the raw water tank 1, and the muddy water generated during the treatment process is discharged by the raw water pretreatment system 2 into the sludge treatment system 21 for treatment. The sludge treatment system 21 can treat the sludge water into relatively clear treated water, and then the treated water is transported back to the raw water pretreatment system 2 to continue participating in the treatment of wastewater. The sludge and the like carry a lot of impurity particles and various ions in the raw water and wastewater and are discharged to the sludge transfer device 211, and are transferred to a specific treatment location for treatment through the sludge transfer device 211. The sludge transfer device 211 can be a transfer vehicle or a transfer pipeline.

[0039] In some embodiments, an oily wastewater treatment system 9 is further included. The input end of the oily wastewater treatment system 9 is used to receive oily wastewater, and the output end of the oily wastewater treatment system 9 is respectively connected to the raw water pretreatment system 2 and the evaporation pond 8.

[0040] Specifically, during the operation of a gas turbine power plant, wastewater containing oil is often generated. Before this part of the wastewater is recycled and reused, the oil in it needs to be removed first. Therefore, an oily wastewater treatment system 9 is set up to separate the oil from the wastewater. The treated water generated is transported to the raw water pretreatment system 2 for unified treatment, and the concentrated oily wastewater generated is input into the evaporation pond 8. After the water evaporates, the oil and the solid salt crystals are treated together, achieving zero discharge of oily wastewater.

[0041] In some embodiments, the output end of the evaporation pond 8 is connected to an external transportation treatment device 81, and the input end of the evaporation pond 8 is also connected to a laboratory wastewater output device 82.

[0042] Specifically, during the operation of a gas turbine power plant, other difficult-to-treat wastewater will also be generated, such as acid-base waste liquid generated in the laboratory. The amount of this difficult-to-treat wastewater is small, so it is not necessary to treat it through the raw water pretreatment system 2 and a series of subsequent filtration systems. Instead, it is directly input into the evaporation pond 8. After the water evaporates, the remaining impurities are treated together with the oil and solid salt crystals. After the water in the evaporation pond 8 has completely evaporated, the remaining solid pollutants are transferred through the external transportation treatment device 81, and after being transferred to a specific place, they are separated and re-treated or buried together. The external transportation treatment device 81 can be a transport vehicle or pipeline transportation, etc. The laboratory wastewater output device 82 can also be a transfer trolley or directly transport the laboratory wastewater to the evaporation pond 8 through structures such as pipelines.

[0043] In some embodiments, the output end of the first water tank 22 is further connected to an industrial fire-fighting water device 221. Specifically, the water produced in the raw water pretreatment system 2 is conveyed to the first water tank 22 for temporary storage. The water in the first water tank 22 can meet the requirements of fire-fighting water after preliminary treatment. Therefore, the output end of the first water tank 22 is connected to the industrial fire-fighting water device 221 through a pipeline.

[0044] In some embodiments, the input end of the raw water tank 1 is connected to a raw water output device 11, a boiler drain output device 12, and an iron removal filter backwash water output device 13. The iron removal filter is used to treat boiler condensate.

[0045] A first feed pump 14 is provided at the output end of the raw water tank 1, and the output end of the first feed pump 14 is connected to the raw water pretreatment system 2.

[0046] Specifically, in the present utility model, the raw water tank 1 is no longer a conventional raw water storage system, but also serves as a storage system for the recyclable wastewater of the whole plant. In addition to storing raw water, it also receives the boiler drain and the backwash water of the iron removal filter. The raw water tank 1 is connected to the boiler drain pipeline and the iron removal filter through pipelines. The iron removal filter is set because the waste heat boiler systems in gas turbine power plants are all steam drum boilers. The water quality requirements of steam drum boilers are relatively broad, and steam drum boilers also have a blowdown function. Therefore, the necessity of setting a fine treatment and desalination system for their condensate is reduced. So, setting an iron removal filter can eliminate most of the generation of acid-base wastewater.

[0047] In some embodiments, a second feed pump 23 is provided between the first water tank 22 and the ultrafiltration system 3, and a third feed pump 32 is provided between the second water tank 31 and the first-stage reverse osmosis system 4. Specifically, the settings of the second feed pump 23 and the third feed pump 32 can quickly and stably pump the treated water in the first water tank 22 into the ultrafiltration system 3, and pump the water in the second water tank 31 into the first-stage reverse osmosis system 4, ensuring the stability and high efficiency of the entire wastewater filtration and treatment process.

[0048] In summary, the embodiment of the utility model provides a water system for a gas turbine power plant. In the utility model, the raw water pool 1 is optimized, and all the recyclable wastewater is collected in the raw water pool 1, and then enters the raw water pretreatment system 2, the ultrafiltration system 3, the primary reverse osmosis system 4, the secondary reverse osmosis system 5 and the EDI device 61 for purification treatment to obtain relatively clean water that can be directly used, and the concentrated water finally produced is discharged to the evaporation pond 8 through the concentrated water reverse osmosis system 7, thereby avoiding the discharge of wastewater; and the oily wastewater is first treated by the oily wastewater treatment system 9, and the produced treated water is discharged into the raw water pretreatment system 2 for unified treatment, and the concentrated oily wastewater produced is directly discharged into the evaporation pond 8. In addition, some small batches of wastewater that are difficult to treat generated by other processes in the plant area, including laboratories, are directly discharged into the evaporation pond 8. After the water in the evaporation pond 8 is evaporated, the residual oil and solid salt crystals in the evaporation pond 8 are uniformly transported to a specific place for treatment, or buried on the spot or classified for further treatment.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A water system for a gas turbine power plant, characterized in that: It includes a raw water pool, a raw water pretreatment system, a first water tank, an ultrafiltration system, a second water tank, a primary reverse osmosis system, a secondary reverse osmosis system and a fresh water tank connected in sequence; The output end of the primary reverse osmosis system is also connected to a concentrated water reverse osmosis system, the concentrated water reverse osmosis system is used to receive concentrated water output by the primary reverse osmosis system, and the output end of the concentrated water reverse osmosis system is respectively connected to an evaporation pond and the fresh water tank; The output end of the secondary reverse osmosis system is also connected to the second water tank; Among them, the raw water pretreatment system, ultrafiltration system, primary reverse osmosis system and secondary reverse osmosis system are used to treat wastewater step by step, the first water tank, the second water tank and the fresh water tank are respectively used to store treated water generated in different wastewater treatment processes, and the evaporation pond is used to store terminal wastewater.

2. The water system of a gas turbine power plant according to claim 1, characterized in that: The output end of the fresh water tank is connected to an EDI device, and the output ends of the EDI device are respectively connected to a desalted water tank and the second water tank.

3. The water system of a gas turbine power plant according to claim 1, characterized in that: The output end of the raw water pretreatment system is also connected to a sludge treatment system, and the output end of the sludge treatment system is respectively connected to a sludge transfer device and the raw water pretreatment system.

4. The water system of a gas turbine power plant according to claim 1, characterized in that: It also includes an oily wastewater treatment system, the input end of which is used to receive oily wastewater, and the output end of which is respectively connected to the raw water pretreatment system and the evaporation pond.

5. The water system of a gas turbine power plant according to claim 4, characterized in that: The output end of the evaporation pond is connected to an external transport treatment device, and the input end of the evaporation pond is also connected to a laboratory wastewater output device.

6. The water system of a gas turbine power plant according to claim 1, characterized in that: The output end of the first water tank is also connected to an industrial fire-fighting water device.

7. The water system of a gas turbine power plant according to claim 1, characterized in that: The input end of the raw water tank is connected to a raw water output device, a boiler drainage output device and an iron removal filter backwash water output device, wherein the iron removal filter is used to process boiler condensate; A first water supply pump is provided at the output end of the raw water pool, and the output end of the first water supply pump is connected to the raw water pretreatment system.

8. The water system of a gas turbine power plant according to claim 1, characterized in that: A second water supply pump is provided between the first water tank and the ultrafiltration system, and a third water supply pump is provided between the second water tank and the primary reverse osmosis system.

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