CN217816697U - Supercritical gas boiler starts drainage system and supercritical gas boiler system - Google Patents

Abstract

The utility model provides a supercritical gas boiler starts drainage system and supercritical gas boiler system, include: the starting separator of entry and evaporimeter intercommunication, the hydrophobic flash vessel that the hydrophobic export of entry and starting separator passes through first drain pipe intercommunication, the header tank of entry and the hydrophobic export intercommunication of hydrophobic flash vessel, the drain pump of the hydrophobic export intercommunication of input and header tank, the condenser with the output intercommunication of drain pump, the unit water drainage tank with the drain outlet intercommunication of header tank, the level gauge that is used for gathering the liquid level information in the starting separator that sets up on starting the separator, and the governing valve of setting on first drain pipe, wherein, the steam outlet and the low temperature over heater intercommunication of starting the separator, the steam outlet and the atmosphere intercommunication of hydrophobic flash vessel, the governing valve is according to the aperture of the liquid level information control governing valve that the level gauge gathered. The utility model discloses supercritical gas boiler's stability can be improved.

Description

Supercritical gas boiler starts drainage system and supercritical gas boiler system

Technical Field

The utility model relates to a supercritical gas boiler technical field, in particular to supercritical gas boiler starts drainage system and supercritical gas boiler system.

Background

The gas boiler is widely applied to the fields of steel plant gas power generation, coal chemical plant coal tail gas power generation and the like, and can realize clean and efficient utilization of energy. In order to improve the efficiency of gas boilers, various large main engine plants have started to apply supercritical technology to gas boilers, and the miniaturization of supercritical boilers is realized. The first supercritical gas-fired boiler in the world is put into operation, the BMCR working condition of the boiler has main steam flow of 430t/h, main steam pressure of 25.4MPa, main steam temperature of 605 ℃, and generating power of a single unit of 145MW. At present, a starting drainage system of a supercritical coal-fired unit is adopted for a starting drainage system of a single medium-sized and small-sized gas-fired boiler with the evaporation capacity of about 450 t/h. The supercritical gas boiler starting drainage system comprises a starting separator, a drainage flash tank, a header tank, a drainage pump, a condenser and a unit drainage groove, wherein the starting separator is communicated with an evaporator, an inlet of the starting separator is communicated with a drainage outlet of the starting separator, the header tank is communicated with a drainage outlet of the drainage flash tank, the input end of the drainage pump is communicated with the drainage outlet of the header tank, the condenser is connected with the output end of the drainage pump, the unit drainage groove is communicated with a drain outlet of the header tank, a steam outlet of the starting separator is communicated with a low-temperature superheater, and a steam outlet of the drainage flash tank is communicated with the atmosphere. However, when the supercritical gas boiler start-up drainage system works, the supercritical gas boiler cannot stably operate due to the fact that water in the start-up separator flows into the low-temperature superheater, or water vapor in the start-up separator flows into the drainage flash tank to cause waste of the water vapor, or even the supercritical gas boiler start-up drainage system cannot stably operate due to excessive water vapor loss.

Therefore, it is necessary to improve the start-up drainage system of the existing supercritical gas boiler to improve the operation stability of the supercritical gas boiler.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a supercritical gas boiler starts drainage system and supercritical gas boiler system to solve the current problem that supercritical gas boiler starts drainage system poor stability.

In order to solve the technical problem, the utility model provides a supercritical gas boiler starts drainage system, include: the entry and the start-up separator of evaporimeter intercommunication, the entry with the hydrophobic flash vessel that the hydrophobic export of start-up separator communicates through first drain pipe, the entry with the header tank of the hydrophobic export intercommunication of hydrophobic flash vessel, the input with the drain pump of the hydrophobic export intercommunication of header tank, with the condenser of the output intercommunication of drain pump, with the unit water drainage tank of the drain intercommunication of header tank sets up be used for gathering on the start-up separator the level gauge of the liquid level information in the start-up separator, and set up governing valve on the first drain pipe, wherein, the steam outlet and the low temperature over heater intercommunication of start-up separator, the steam outlet and the atmosphere intercommunication of hydrophobic flash vessel, the governing valve basis the liquid level information control that the level gauge gathered the aperture of governing valve.

Optionally, the number of the first drain pipes is two, and two regulating valves are respectively arranged on the two first drain pipes.

Optionally, the entry of header tank with the hydrophobic export of hydrophobic flash tank passes through the second drain pipe intercommunication, the input of drain pump with the hydrophobic export of header tank passes through the third drain pipe intercommunication, the condenser with the output of drain pump passes through the fourth drain pipe intercommunication, unit water drainage tank with the drain of header tank passes through the sewage pipes intercommunication, the steam outlet of hydrophobic flash tank passes through first exhaust duct and atmosphere intercommunication.

Optionally, the first drain pipe is further provided with a first stop valve, the third drain pipe is further provided with a second stop valve, the fourth drain pipe is further provided with a third stop valve, and the sewage drain pipe is provided with a fourth stop valve.

Optionally, a steam outlet of the water collecting tank is communicated with the first exhaust pipeline through a second exhaust pipeline.

Optionally, the number of the drainage pumps is two, the number of the third drainage pipes is two, and the number of the fourth drainage pipes is two.

Optionally, the drain pump is a variable frequency pump.

Optionally, the drain flash tank is an atmospheric flash tank.

Optionally, still include with the cooling water pipeline of unit drain tank intercommunication.

The utility model also provides a supercritical gas boiler system, start hydrophobic system including foretell supercritical gas boiler.

The utility model provides a pair of supercritical gas boiler starts drainage system and supercritical gas boiler system has following beneficial effect:

through setting up be in be used for gathering on the start separator the level gauge of the liquid level information in the start separator, and through setting up governing valve on the first drain pipe, and through making the governing valve basis the liquid level information control that the level gauge gathered the aperture of governing valve, the change of the aperture of accessible governing valve make the liquid level of the water in the start separator too high also not low excessively, avoid the liquid level of the water in the start separator too high to lead to rivers to flow into low temperature over heater and lead to supercritical gas boiler can not the steady operation to and avoid the liquid level of the water in the start separator too low to make the vapor in the start separator flow into the waste that hydrophobic flash tank leads to vapor, lead to supercritical gas boiler to start the hydrophobic system even and because the vapor runs off too much and can not the steady operation, consequently, through the utility model provides a supercritical gas boiler starts the hydrophobic system can make the supercritical gas boiler start the hydrophobic system steady operation.

Drawings

Fig. 1 is a schematic structural diagram of a supercritical gas boiler start-up drainage system in an embodiment of the present invention.

Description of reference numerals:

110-start the separator; 120-a first hydrophobic conduit; 130-a hydrophobic flash tank; 140-a water collection tank; 150-a drainage pump; 170-unit drain tank; 180-a liquid level meter; 190-regulating valve; 210-a second hydrophobic conduit; 220-a third hydrophobic conduit; 230-a fourth hydrophobic conduit; 240-a blowdown line; 250-a first exhaust conduit; 260-first stop valve; 270-a second stop valve; 280-a third stop valve; 290-a fourth stop valve; 310-a second exhaust duct; 320-a third exhaust duct.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a supercritical gas boiler start-up drainage system in an embodiment of the present invention, the supercritical gas boiler start-up drainage system includes: the system comprises a starting separator 110 with an inlet communicated with an evaporator, a hydrophobic flash tank 130 with an inlet communicated with a hydrophobic outlet of the starting separator 110 through a first hydrophobic pipeline 120, a water collecting tank 140 with an inlet communicated with a hydrophobic outlet of the hydrophobic flash tank 130, a hydrophobic pump 150 with an input end communicated with a hydrophobic outlet of the water collecting tank 140, a condenser communicated with an output end of the hydrophobic pump 150, a unit drainage tank 170 communicated with a drain outlet of the water collecting tank 140, a liquid level meter 180 arranged on the starting separator 110 and used for collecting liquid level information in the starting separator 110, and an adjusting valve 190 arranged on the first hydrophobic pipeline 120, wherein a steam outlet of the starting separator 110 is communicated with the low-temperature superheater, a steam outlet of the hydrophobic flash tank 130 is communicated with the atmosphere, and the adjusting valve 190 controls the opening degree of the adjusting valve 190 according to the liquid level information collected by the liquid level meter 180.

The system comprises a starting separator 110 communicated with an evaporator through an inlet, a drainage flash tank 130 communicated with a drainage outlet of the starting separator 110 through a first drainage pipeline 120 through an inlet, a water collecting tank 140 communicated with a drainage outlet of the drainage flash tank 130 through an inlet, a drainage pump 150 communicated with a drainage outlet of the water collecting tank 140 through an input end, a condenser communicated with an output end of the drainage pump 150, and a unit drainage tank 170 communicated with a drain outlet of the water collecting tank 140, wherein a steam outlet of the starting separator 110 is communicated with the low-temperature superheater, so that a steam outlet of the drainage flash tank 130 is communicated with the atmosphere, water and steam in a steam-water mixture in the evaporator can be separated through the starting separator 110, after expansion and depressurization through the drainage flash tank 130, heat is discharged into the atmosphere, drained water is recovered into the water collecting tank 140 after collection, and then is drained into the condenser through the drainage pump 150, so that water in the steam-water mixture in the evaporator is drained into the condenser or the unit drainage tank 170, and the function of draining the water and steam in the low-water mixture in the drainage flash tank into the condenser 130 is realized.

By the liquid level meter 180 arranged on the start-up separator 110 and used for collecting liquid level information in the start-up separator 110, and by the regulating valve 190 arranged on the first drain pipe 120, and by enabling the regulating valve 190 to control the opening degree of the regulating valve 190 according to the liquid level information collected by the liquid level meter 180, the liquid level of water in the start-up separator 110 can be made neither too high nor too low through the change of the opening degree of the regulating valve 190, the situation that the water in the start-up separator 110 flows into the low-temperature superheater to cause the non-stable operation of the supercritical gas boiler is avoided, the situation that the water in the start-up separator 110 flows into the drain tank 130 to cause the waste of water vapor due to the fact that the liquid level of the water in the start-up separator 110 is too high to cause the non-stable operation of the supercritical gas boiler due to too much water vapor loss is avoided, and therefore, the supercritical gas boiler start-up drain system in the embodiment can cause the stable operation of the supercritical gas boiler start-up drain system to be stably operated.

Referring to fig. 1, the number of the first drain pipes 120 is two, and two regulating valves 190 are respectively disposed on the two first drain pipes 120. By providing two first drain pipes 120, one of the first drain pipes 120 can be used as a spare pipe, and the repair and maintenance of the first drain pipe 120 and the regulating valve 190 can be facilitated.

The regulator valve 190 is preferably a pneumatic regulator valve 190.

Referring to fig. 1, an inlet of the water collection tank 140 is communicated with a drain outlet of the drain flash tank 130 through a second drain pipe 210, an input end of the drain pump 150 is communicated with a drain outlet of the water collection tank 140 through a third drain pipe 220, the condenser is communicated with an output end of the drain pump 150 through a fourth drain pipe 230, the unit drain tank 170 is communicated with a drain outlet of the water collection tank 140 through a drain pipe 240, and a steam outlet of the drain flash tank 130 is communicated with the atmosphere through a first exhaust pipe 250.

Wherein, the first drain pipe 120 is further provided with a first stop valve 260. Second stop valve 270 is also disposed on third drain pipe 220. A third stop valve 280 is also provided on the fourth drain pipe 230. A fourth stop valve 290 is arranged on the sewage pipeline 240.

Referring to fig. 1, the steam outlet of the sump 140 communicates with the first exhaust duct 250 through a second exhaust duct 310. Because the steam outlet of the drain flash tank 130 is communicated with the atmosphere through the first exhaust pipe 250, and the steam outlet of the water collection tank 140 is communicated with the first exhaust pipe 250 through the second exhaust pipe 310, the steam outlet of the water collection tank 140 is communicated with the atmosphere, so that the steam in the water collection tank 140 can be discharged in time, the pressure in the water collection tank 140 is prevented from being too large, and meanwhile, water can conveniently flow into the water collection tank 140 from the inlet and flow out of the water collection tank 140 from the drain outlet.

Referring to fig. 1, the number of the drain pumps 150 is two, the number of the third drain pipes 220 is two, the number of the fourth drain pipes 230 is two, and one of the third drain pipes 220, one of the fourth drain pipes 230, and the drain pump 150 may serve as a spare pipe, which may facilitate the repair and maintenance of the third drain pipes 220, the fourth drain pipes 230, and the drain pump 150.

The drain pump 150 is a variable frequency pump. The drainage pump can adapt to the drainage condition in the load fluctuation stage, and meanwhile, the drainage pump runs more economically, so that the plant power consumption rate in the running stage is reduced, and the running cost is reduced.

The hydrophobic flash tank 130 is an atmospheric flash tank.

The supercritical gas boiler startup trap system further comprises a third exhaust gas conduit 320 in communication with the exhaust gas port of the startup separator 110. Exhaust gas within the start-up separator 110 may be discharged through a third exhaust conduit 320.

Referring to fig. 1, the supercritical gas boiler startup drainage system further includes a cooling water pipe communicated with the unit drainage groove 170, and by setting the cooling water pipe, it is possible to prevent the unit drainage groove 170 from being damaged by an excessively high water temperature when the unit drainage groove 170 is thermally cleaned.

When the supercritical gas boiler is started to be cleaned, the feed water quality at the inlet of the economizer and the outlet water quality of the separator 110 are mainly monitored. When the water is cleaned in a hot state, the water temperature at the outlet of the water-cooling wall also needs to be controlled. Whether cold cleaning or hot cleaning is aimed at, the supercritical gas boiler start-up drainage system in the embodiment can meet the start-up operation requirement of the supercritical gas boiler.

During cold cleaning, when the iron content of outlet water of the separator 110 is more than 1000 mug/L, a discharge flushing mode is adopted, the drain pump 150 is closed, the fourth stop valve 290 on the sewage pipeline 240 is opened, and outlet water of the separator 110 is started to be directly discharged to the unit drainage tank 170 through the sewage pipe of the water collecting tank 140; when the iron content of outlet water of the starting separator 110 is less than 1000 mug/L, the fourth stop valve 290 is closed, the drain pump 150 is started, water is returned to the condenser for circulation, and condensed water is put into the condenser for fine treatment, so that the water quality is improved.

When in hot cleaning, when the Fe content of the outlet water quality of the starting separator 110 is more than 1000 mug/L, a hot open type flushing mode is adopted, the drain pump 150 is closed, the fourth stop valve 290 on the sewage discharge pipeline 240 is opened, the outlet water of the starting separator 110 is directly discharged to the unit drainage tank 170 through the sewage discharge pipe of the water collection tank 140, and cooling water can be synchronously introduced into the unit drainage tank 170 for mixed cooling; and when the Fe content of the outlet water quality of the starting separator 110 is less than 1000 mug/L, closing the fourth stop valve 290, starting the drain pump 150, returning the water to the condenser for circulation, putting the condensed water for fine treatment, and improving the water quality until the Fe content of the outlet water quality of the starting separator 110 is less than 100 mug/L, and ending the starting flushing process.

The embodiment provides a supercritical gas boiler system, which comprises the supercritical gas boiler starting water draining system in the embodiment.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims (10)

1. A supercritical gas boiler start-up drainage system, comprising: the entry and the start-up separator of evaporimeter intercommunication, the entry with the hydrophobic flash vessel that the hydrophobic export of start-up separator communicates through first drain pipe, the entry with the header tank of the hydrophobic export intercommunication of hydrophobic flash vessel, the input with the drain pump of the hydrophobic export intercommunication of header tank, with the condenser of the output intercommunication of drain pump, with the unit water drainage tank of the drain intercommunication of header tank sets up be used for gathering on the start-up separator the level gauge of the liquid level information in the start-up separator, and set up governing valve on the first drain pipe, wherein, the steam outlet and the low temperature over heater intercommunication of start-up separator, the steam outlet and the atmosphere intercommunication of hydrophobic flash vessel, the governing valve basis the liquid level information control that the level gauge gathered the aperture of governing valve.

2. The supercritical gas boiler startup steam trap system of claim 1 wherein there are two first steam trap lines, and each of the two first steam trap lines has a regulating valve.

3. The supercritical gas boiler startup drainage system according to claim 1, wherein an inlet of the header tank is communicated with a drainage outlet of the drainage flash tank through a second drainage pipeline, an input end of the drainage pump is communicated with a drainage outlet of the header tank through a third drainage pipeline, the condenser is communicated with an output end of the drainage pump through a fourth drainage pipeline, the unit drainage tank is communicated with a drain outlet of the header tank through a drain pipeline, and a steam outlet of the drainage flash tank is communicated with atmosphere through a first exhaust pipeline.

4. The supercritical gas boiler startup steam trap system as recited in claim 3 wherein said first steam trap is further provided with a first stop valve, said third steam trap is further provided with a second stop valve, said fourth steam trap is further provided with a third stop valve, and said blowdown line is provided with a fourth stop valve.

5. The supercritical gas boiler startup water drainage system of claim 3 wherein the steam outlet of the header tank is in communication with the first exhaust conduit through a second exhaust conduit.

6. The supercritical gas boiler startup steam trap system of claim 3 wherein the number of steam trap pumps is two, the number of third steam trap pipes is two, and the number of fourth steam trap pipes is two.

7. The supercritical gas boiler startup steam trap system of claim 1 wherein the steam trap pump is a variable frequency pump.

8. The supercritical gas boiler startup trap system of claim 1 wherein the trap flash tank is an atmospheric flash tank.

9. The supercritical gas boiler startup steam trap system of claim 1 further comprising a cooling water conduit in communication with the unit drain tank.

10. A supercritical gas boiler system, characterized by comprising a supercritical gas boiler startup water drainage system according to any one of claims 1-9.

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