CN217763385U

CN217763385U - Power plant heating power steam-water circulation system

Info

Publication number: CN217763385U
Application number: CN202221161347.0U
Authority: CN
Inventors: 唐莉萍; 宫恩蒙
Original assignee: Shaanxi Energy Linbei Power Generation Co ltd
Current assignee: Shaanxi Energy Linbei Power Generation Co ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-11-08
Anticipated expiration: 2032-05-13

Abstract

The utility model discloses a power plant's heating power steam-water circulation system, including condenser and turboset, condenser storage demineralized water and provide drive turbine work effect demineralized water steam to the turboset through the pipeline, the demineralized water steam returns the condenser and is retrieved and recycled after the turboset does work, mixed ion exchanger has set gradually along the demineralized water flow direction on the pipeline between condenser and turboset, the oxygen-eliminating device, catch water and over heater, still be equipped with the pump package on the pipeline between condenser and turboset, a heating equipment, the oxygen addition point, add ammonia point and fill nitrogen point, the oxygen-eliminating water sampling pipe is connected to the soda sample frame, the pipeline is connected with the sample water collecting box on the soda sample frame, the sample water collecting box collects the sample water and carries the sample water after collecting to the condenser through the pipeline. The system avoids the waste of high-quality sample water used in auxiliary machine cooling water, ash residue humidification, desulfurization and other systems, and saves the cost.

Description

Power plant heating power steam-water circulation system

Technical Field

The utility model relates to a power plant's heating power steam-water circulation system.

Background

A steam-water sampling device of a 350MW unit is provided with 17 sampling pipelines, condensed water, a deaerator is arranged in front of the deaerator, a deaerator is arranged behind the deaerator, water is supplied, a separator water side is started, a separator steam side is started, a superheater, a reheater, a high-pressure heater, a low-pressure heater, closed cooling water, inner cooling water, indirect cooling water, auxiliary steam, starting drainage, air heater drainage and heat supply network drainage, and each set of sampling pipeline requires 400-700ML/min stable long flow. If about 0.5 cubic meter of water sample flows out of one sampling pipeline per hour according to the average 500ML/min, the two machine centralized sampling frames can lose 24 cubic meters of demineralized water sample from the heat system every day.

At present, sampling wastewater of a large number of power plants is finally discharged into a unit drainage groove through a water collecting groove drain pipe of a sampling room or directly enters an industrial wastewater pipeline, then is mixed with wastewater in the unit drainage groove and then is discharged to an industrial wastewater treatment station for treatment, and then is recycled to auxiliary machine cooling water, ash residue humidification, desulfurization and other systems.

The water sample recovery needs to overcome ammonium molybdate, sulfuric acid, oxalic acid and ammonium ferrous sulfate substituted by instrument measurement silicon, diisopropylamine substituted by online sodium surface measurement, iron in each channel of hydrophobic water and dissolved oxygen leaked into a pipeline. In order to reduce the loss of desalted water of the unit, the optimal way is to recycle the desalted water into the thermodynamic system of the original unit, and the reliability of system connection, the matching of water quality and pressure are also required to be considered, but the vacuum of the professional condenser of the steam turbine is not influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of high quality, low use and waste loss of demineralized water in the prior art, the utility model adopts the technical scheme that:

the utility model provides a power plant's heating power steam-water circulation system, includes condenser and turboset, the condenser save demineralized water and provide drive turbine work effect demineralized water steam through the pipeline to the turboset, the demineralized water steam returns the condenser after the turboset work and is retrieved and recycles condenser and turboset between the pipeline along demineralized water flow direction set gradually mixed ion exchanger, oxygen-eliminating device, catch water and over heater condenser and turboset between the pipeline on still be equipped with pump package, firing equipment, oxygenation point, ammoniation point and nitrogen charging point condenser and turboset between the pipeline on be provided with a set of deoxidization water sampling pipe, each deoxidization water sampling pipe is connected to steam-water sampling frame the pipeline on the steam-water sampling frame be connected with the sample water collecting box, the sample water is collected to the sample water and is carried the sample water after the collection to the condenser through the pipeline to the sample water collecting box.

Furthermore, the steam-water separator comprises a starting separator, a water storage tank and a drainage flash tank, the starting separator is connected with the steam turbine set through a pipeline to provide dry steam for the steam turbine set, and an oxygen adding point and an ammonia adding point are arranged on the liquid outlet sides of the condenser and the deaerator.

Furthermore, a pump set is arranged on a pipeline at one end of the outlet of the condenser and the deaerator.

Furthermore, heating devices are arranged between the mixed ion exchanger and the deaerator, between the deaerator and the steam-water separator, and between the steam-water separator and the turbine unit.

Furthermore, the heating device comprises a low-pressure heater, a shaft seal heater, a high-pressure heater, an economizer and a water-cooled wall, wherein the low-pressure heater and the shaft seal heater are positioned between the mixed ion exchanger and the deaerator, and the high-pressure heater, the economizer and the water-cooled wall are positioned between the deaerator and the steam-water separator.

Furthermore, an outlet of the mixed ion exchanger is provided with an oxygen adding point and an ammonia adding point, and an outlet of the deaerator is also provided with an oxygen adding point and an ammonia adding point.

Furthermore, the system also comprises a reheater, wherein the reheater is connected with the steam turbine set through a pipeline, can reheat exhaust steam after the steam turbine set does work and supplies the exhaust steam to the steam turbine set again for work.

Furthermore, the deoxygenated water sampling tube is at least arranged at the outlet of the condenser, the inlet/outlet of the deoxygenator, the outlet of the steam-water separator and the outlet of the superheater.

Furthermore, a supply pipe connected with a demineralized water workshop is connected to the condenser.

Furthermore, a drain pipe is arranged on a pipeline between the steam-water sampling frame and the sampling water collecting box.

The steam-water circulating system collects the desalted water collected from the circulating pipeline in the steam-water sampling frame through the sampling water collecting tank, and then returns the desalted water to the condenser for the steam turbine to work again, so that the waste of high-quality sample water in systems such as auxiliary machine cooling water, ash residue humidification and desulfurization is avoided, and the cost is saved.

Drawings

Fig. 1 is a schematic view of the system of the present invention.

Detailed Description

The thermal steam-water circulation system of the power plant as shown in fig. 1 comprises a condenser 1 and a steam turbine set 2, wherein a supply pipe 20 from a demineralized water workshop is arranged on the condenser 1, demineralized water is supplemented into the condenser 1 through the supply pipe 20, the condenser 1 heats and pressurizes the demineralized water through various devices in a pipeline to form saturated superheated steam, the saturated superheated steam is conveyed to the steam turbine set 2 to supply work to the steam turbine set 2, the various devices arranged in the pipeline enable the demineralized water to meet the use requirements of the steam turbine set 2, and leakage and loss are generated in the process of circulation, so that the demineralized water needs to be supplemented into the condenser through the demineralized water workshop. The device for treating the demineralized water from the condenser 1 to the steam turbine unit 2 sequentially comprises a mixed ion exchanger 3, a deaerator 4, a steam-water separator 5 and a superheater 6 along the flow direction of the demineralized water, and is further provided with a pump group, a heating device, an oxygenation point 7, an ammoniation point 8, a nitrogen charging point 9 and deaerated water sampling pipes 19 for collecting important monitoring positions in a pipeline between the condenser 1 and the steam turbine unit 2, the deaerated water sampling pipes 19 are uniformly connected to a steam-water sampling frame 10, sampling detection is carried out on the steam-water sampling frame 10, the steam-water sampling frame 10 is connected to a sampling water collecting box 11 through a pipeline, redundant demineralized water in the steam-water sampling frame 10 is collected in a centralized manner through the sampling water collecting box 11, finally the sampling water collecting box 11 is connected to the condenser 1 through a pipeline, and sampling water (namely demineralized water) is supplemented to a reheating power steam-water circulation system in the condenser 1 through the sampling water collecting box 11, so that waste of the demineralized water is avoided. And because the demineralized water in the steam-water sampling frame 10 can bring ammonium molybdate, sulfuric acid, oxalic acid, ammonium ferrous sulfate, diisopropylamine substituted by online sodium meter measurement, iron in each channel of hydrophobic water and dissolved oxygen leaked and entering in the pipeline, the demineralized water can reach the use standard through the mixed ion exchanger 3, and compared with the demineralized water supplemented to other parts, the demineralized water supplemented to the condenser 1 can not have overhigh pressure and temperature to limit the demineralized water entering in the sampling water collecting box 11.

In order to drive demineralized water to flow in a pipeline, pump sets are arranged at the outlets of at least a condenser 1 and a deaerator 4 to provide power, a mixed ion exchanger 3 is arranged at the outlet of the condenser 1 to remove iron and purify water quality from the demineralized water, an oxygen adding point 7 and an ammonia adding point 8 are arranged at the outlet of the mixed ion exchanger 3, oxygen and ammonia are added into a demineralized water pipeline through a pipeline at the oxygen adding point 7 and the ammonia adding point 8, the oxygen adding is used for enabling the oxygen content of the desalted water after fine treatment to reach the level capable of passivating steel equipment and pipelines of a thermodynamic system and avoiding corrosion of the demineralized water to the pipelines and the equipment when the water quality conductivity is low, the ammonia adding is used for adjusting the pH value of the demineralized water to enable the pH value to be between 9.2 and 9.6, the oxygen content in the demineralized water is kept between 10 and 20 micrograms through the deaerator 4, and the oxygen adding point at the outlet of the condenser 1 and the ammonia adding point need to cooperate to enable the water quality to reach the standard. Also be provided with at oxygen-eliminating device 4 exit and add oxygen point 7 and add ammonia point 8, add oxygen point 7 and aim at and add the oxygen to the demineralized water after the oxygen-eliminating device excessively deoxidization and be that demineralized water oxygen content is up to standard, the purpose of here adding ammonia can quick adjustment pH value when starting the machine, consequently the oxygen point 7 of here is according to the oxygen content of deoxidized water and decide whether open, add the ammonia point and open when starting only, then do not add ammonia after the operation. Still be equipped with at oxygen-eliminating device 4 exit and fill nitrogen point 9, fill nitrogen point 9 and let in nitrogen gas in can to the pipeline, need open under the shutdown state, fill into nitrogen gas protective gas in to the pipeline and prevent corroding, give the position in removing the picture, fill nitrogen point position can select to set up can in the arbitrary position that conveniently sets up of pipeline that removes the brine flow. The steam-water separator 5 comprises a starting separator 5-1, a water storage tank 5-2 and a drainage flash tank 5-3, wherein the starting separator 5-1 is used for carrying out dry-wet separation on heated steam, the dry steam is sent into a superheater 6 for continuous heating and pressurization, then is sent into a steam turbine unit 2 for driving a steam turbine to work, and the wet steam enters the water storage tank 5-2 and the drainage flash tank 5-3 and then is recycled through a drainage pump. Since the demineralized water is heated to a certain temperature when being used as steam for driving the steam turbine set 2, and the heating process is a continuous process, the heating device described above includes a low-pressure heating 12, a shaft seal heating 13, a high-pressure heating 14, an economizer 15, and a water wall 16, and since no demineralized water finishing treatment needs to be performed at a temperature below 65 ℃ and within 4.5 mpa, the low-pressure heating 12 and the shaft seal heating 13 are disposed after the mixed ion exchanger 3, the economizer 15 and the water wall 16 after the high-pressure heating 14 exchange heat with the demineralized water in the pipeline to heat, and the demineralized water is sent into the steam-water separator 5 through the above heating process.

In order to further fully utilize the high-temperature desalted water, the steam turbine set 2 is also connected with a reheater 17, and after the steam turbine set 2 is heated again to work, the exhaust steam is heated and pressurized to be conveyed into the steam turbine set 2 again to work.

The sampling water pipes are arranged on a pipeline between the condenser 1 and the turbine unit 2, the sampling detection is carried out on the desalted water at the inlet and the outlet of each device respectively, whether the sampling water meets the index is continuously monitored, specifically, the deaerator 4 inlet/outlet, the steam-water separator 5 outlet, the superheater outlet and the reheater 17 outlet are provided with deaerated water sampling pipes 19, except the above positions, the deaerated water sampling pipes 19 can be erected at the outlet positions of the high-pressure heater 14 and the like according to the detection requirements, and the deaerated water sampling pipes 19 are finally collected and connected to the steam-water sampling frame 10 for collection and detection, and the sampling water collection box 11 is recovered to be supplemented to the condenser 1 for cyclic utilization.

The sampling water collection box 11 can be provided with a plurality of output pipelines to connect a plurality of groups of circulating steam-water circulating systems. A drain pipe 18 is also arranged on a pipeline between the steam-water sampling frame 10 and the sampling water collecting box 11, so that sampling water on the steam-water sampling frame 10 can be drained into sewage treatment equipment, and the water collecting box can be conveniently overhauled.

Claims

1. The utility model provides a power plant's heating power steam-water circulation system, includes condenser (1) and turbine unit (2), condenser (1) storage demineralized water and provide drive turbine work effect demineralized water steam to turbine unit (2) through the pipeline, demineralized water steam returns condenser (1) and is retrieved and recycles behind turbine unit (2) work mixed ion exchanger (3), oxygen-eliminating device (4), catch water (5) and over heater (6) have set gradually along demineralized water flow direction on the pipeline between condenser (1) and turbine unit (2) on still be equipped with pump package, firing equipment, oxygenation point (7), ammoniation point (8) and nitrogen charging point (9), its characterized in that: the device is characterized in that a group of deaerated water sampling pipes (19) are arranged on a pipeline between the condenser (1) and the turbine unit (2), each deaerated water sampling pipe (19) is connected to a steam water sampling frame (10), a sampling water collecting box (11) is connected to the pipeline on the steam water sampling frame (10), and the sampling water collecting box (11) collects sampling water and conveys the collected sampling water to the condenser (1) through a pipeline.

2. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: the steam-water separator (5) comprises a starting separator (5-1), a water storage tank (5-2) and a drainage flash tank (5-3), wherein the starting separator (5-1) is connected with the steam turbine set (2) through a pipeline to provide dry steam for the steam turbine set (2), and an oxygen adding point (7) and an ammonia adding point (8) are arranged on the liquid outlet sides of the steam condenser (1) and the oxygen remover (4).

3. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: and pump sets are arranged on pipelines at one ends of outlets of the condenser (1) and the deaerator (4).

4. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: heating devices are arranged between the mixed ion exchanger (3) and the deaerator, between the deaerator (4) and the steam-water separator (5), and between the steam-water separator (5) and the steam turbine set (2).

5. The power plant thermodynamic steam-water cycle system of claim 4, wherein: the heating device comprises a low-pressure heater (12), a shaft seal heater (13), a high-pressure heater (14), an economizer (15) and a water-cooled wall (16), wherein the low-pressure heater (12) and the shaft seal heater (13) are arranged between the mixed ion exchanger (3) and the deaerator, and the high-pressure heater (14), the economizer (15) and the water-cooled wall (16) are arranged between the deaerator (4) and the steam-water separator (5).

6. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: an outlet of the mixed ion exchanger (3) is provided with an oxygen adding point (7) and an ammonia adding point (8), and an outlet of the deaerator (4) is also provided with an oxygen adding point and an ammonia adding point (8).

7. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: the steam turbine system is characterized by further comprising a reheater (17), wherein the reheater (17) is connected with the steam turbine unit (2) through a pipeline and can reheat exhaust steam after the steam turbine unit (2) does work and supply the exhaust steam to the steam turbine unit (2) again for work.

8. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: the deoxygenated water sampling tube (19) is at least arranged at the outlet of the condenser (1), the inlet/outlet of the deoxygenator (4), the outlet of the steam-water separator (5) and the outlet of the superheater (6).

9. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: and a supply pipe (20) connected with a demineralized water workshop is connected to the condenser (1).

10. A power plant thermodynamic steam-water cycle system according to claim 1, characterized in that: a drain pipe (18) is arranged on a pipeline between the steam-water sampling frame (10) and the sampling water collecting box (11).