CN210772106U - Steam recovery system of boiler blow-down flash tank - Google Patents
Steam recovery system of boiler blow-down flash tank Download PDFInfo
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- CN210772106U CN210772106U CN201921224608.7U CN201921224608U CN210772106U CN 210772106 U CN210772106 U CN 210772106U CN 201921224608 U CN201921224608 U CN 201921224608U CN 210772106 U CN210772106 U CN 210772106U
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Abstract
The utility model relates to a boiler blowdown flash tank steam recovery system belongs to boiler technical field. The technical scheme is as follows: the boiler is characterized in that a water feed pump set (6) is connected with a demineralized water tank (4) through a water feed pump set water inlet pipeline (14), a boiler body (1) is connected with the water feed pump set (6) through a water feed pipeline (8), a circulating water pump (7) is connected with the demineralized water tank (4) through a circulating pump water inlet pipeline (15), the water side of a water jet heat exchanger (3) is connected with the circulating water pump (7) through a water jet heat exchanger water inlet pipeline (11), the water jet heat exchanger (3) is connected with a water mixer (5) through a pipeline (12), and a demineralized water incoming water pipeline (13) is connected with the water mixer (5). The utility model has the advantages that: under the jet flow effect of the water jet heat exchanger, low-pressure steam generated in the blowdown flash tank is sucked into the water jet heat exchanger and recycled into a steam-water system of the boiler, so that the purpose of waste heat recovery is realized, and the energy utilization efficiency is improved.
Description
Technical Field
The utility model relates to a boiler blowdown flash tank steam recovery system belongs to boiler technical field.
Background
The boiler is a heat exchange device which utilizes the heat energy of energy sources such as fuel and the like or the waste heat in industrial production to heat working media to a certain temperature and pressure, water is the most commonly used working media of the boiler and is treated by softening or desalting and other treatment processes before entering the boiler, but boiler feed water always has certain salinity, after the treatment of adding medicine in a steam drum, scaling substances are converted into water slag, and meanwhile, corrosion products can be generated when the boiler water corrodes metals, therefore, the boiler water contains various soluble and insoluble impurities, and in the operation of the boiler, the impurity concentration is gradually increased due to the continuous evaporation of the boiler water. The excessive impurity concentration of the boiler water not only influences the steam quality, but also can cause scaling and corrosion of the inner wall of the heating surface and influence the safe operation of the boiler. In order to control the quality of the boiler water, boiler blow-down must be performed to discharge part of the salt and the grain slag.
The boiler pollution discharge is divided into continuous pollution discharge and periodic pollution discharge. The purpose of continuous blowdown is to discharge part of the salt dissolved in the furnace water to maintain a certain salt content and alkalinity of the furnace water. The pollution discharge method is to continuously discharge the water from the evaporation surface with the highest salt concentration of the furnace water, and is also called surface pollution discharge. The periodic sewage discharge aims at discharging insoluble water slag in furnace water, and the sewage discharge method is to periodically discharge the insoluble water slag from a water-cooled wall lower header with the most accumulated sediments.
Because the pressure and the temperature of blowdown water are higher, for the saturation temperature under the steam pocket operating pressure, for guaranteeing safety, generally discharge into the sewer after carrying out the step-down cooling through the flash tank. In the flash tank, the temperature of the sewage is higher than the saturation temperature corresponding to the pressure of the flash tank, part of the water is vaporized, and after the heat is released, the temperature of the rest water is reduced to the saturation temperature under the pressure of the flash tank. The low-pressure steam which is slightly higher than the atmospheric pressure can be generated, and the amount of the low-pressure steam is about 20 to 30 percent of the total sewage discharge amount. In a small boiler and a waste heat boiler system, the part of vaporized steam is generally directly discharged to the air and cannot be effectively recycled, so that large heat loss is caused and the environment is polluted.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a boiler blowdown flash tank steam recovery system can fully retrieve the steam that boiler blowdown flash tank produced in the blowdown process, realizes waste heat recovery and eliminates and emits the white cigarette phenomenon, solves the problem that exists among the background art.
The technical scheme of the utility model is that:
the utility model provides a boiler blowdown flash tank steam recovery system, contain the boiler body, the blowdown flash tank, water jet heat exchanger, the demineralized water tank, water mixer, feed water pump group and circulating water pump, be connected through feed water pump group inlet channel between feed water pump group and the demineralized water tank, be connected through the water supply pipe between boiler body and the feed water pump group, the blowdown pipeline that the boiler body was drawn forth is connected with the blowdown flash tank, be connected through circulating pump inlet channel between circulating water pump and the demineralized water tank, be connected through water jet heat exchanger inlet channel between water jet heat exchanger's the water side and the circulating water pump, be connected through steam conduit between water jet heat exchanger's the steam side and the blowdown flash tank, be connected through pipe connection between water jet heat exchanger and the water mixer, demineralized water incoming water pipeline is connected with water mixer.
The blowdown flash tank is provided with an air discharge control valve and a pressure relief safety valve, a circulating water regulating valve is arranged on a water inlet pipeline of the water-jet heat exchanger, a water supplementing regulating valve is arranged on a demineralized water incoming pipeline, and a water supply regulating valve is arranged on a water supply pipeline.
The empty discharge control valve and the pressure relief safety valve are arranged at the top of the sewage discharge flash tank.
The water mixer is disposed inside the demineralized water tank.
The height of the water mixer is lower than the normal working water level of the desalting water tank.
Adopt the utility model discloses, in the boiler normal operating process, the feed pump group keeps the operation, satisfies the boiler water demand, and the demineralized water pipeline moisturizing governing valve that comes keeps certain aperture, and control demineralized water moisturizing volume matches with the boiler water consumption, keeps the demineralized water tank liquid level at normal liquid level, and the blowdown gets into the blowdown flash tank, forms low pressure steam after partly vaporization, discharges in the atmosphere through the sky emission control valve at top. Starting a circulating water pump, forming water circulation among the water jet heat exchanger, the water mixer and the demineralized water tank, sucking low-pressure steam generated in the blowdown flash tank into the water jet heat exchanger under the action of jet flow of the water jet heat exchanger, mixing the low-pressure steam with circulating water for heat exchange, controlling the amount of circulating water through a circulating water regulating valve until the blowdown flash tank does not emit steam outwards to an empty discharge control valve, and closing the empty discharge control valve; the heated circulating water and the demineralized water make-up water exchange heat in a water mixer, the make-up water is heated, the water in the demineralized water tank is kept at a high temperature, and the water mixer is arranged below a normal liquid level in the demineralized water tank. When the recovery system is in a normal working state, part of steam generated by the blowdown flash tank is recovered and enters a boiler steam-water system, so that the purposes of recovering waste heat and eliminating white smoke are achieved, and the energy utilization efficiency is improved.
When the boiler blow-off volume appears unusual surge, the steam volume that produces in the blowdown flash tank can increase, and pressure risees, reaches the blowdown flash tank and when the highest allowable operating pressure, the pressure release safety valve is opened, discharges the sky, guarantees the safe operation of flash tank.
Boiler body, blowdown flash tank, water jet heat exchanger, demineralized water tank, water mixer, feed pump group and circulating water pump are the known content in the field, the utility model discloses the innovation point is combination and relation of connection and the beneficial effect who brings between them.
The utility model has the advantages that: through the water circulation among the demineralized water tank, the circulating water pump, the water jet heat exchanger and the water mixer, under the jet flow effect of the water jet heat exchanger, low-pressure steam generated in the pollution discharge flash tank is sucked into the water jet heat exchanger and recycled into a steam-water system of the boiler, the purposes of waste heat recovery and white smoke elimination are achieved, and the energy utilization efficiency is improved.
Drawings
FIG. 1 is a schematic view of the present invention;
in the figure: the system comprises a boiler body 1, a sewage discharge flash tank 2, a water jet heat exchanger 3, a demineralized water tank 4, a water mixer 5, a water feed pump unit 6, a circulating water pump 7, a water feed pipeline 8, a sewage discharge pipeline 9, a steam pipeline 10, a water jet heat exchanger water inlet pipeline 11, a pipeline 12, a demineralized water inlet pipeline 13, a water feed pump unit water inlet pipeline 14, a circulating pump water inlet pipeline 15, a water feed regulating valve 16, a pressure relief safety valve 17, an air discharge control valve 18, a circulating water regulating valve 19 and a water replenishing regulating valve 20.
Detailed Description
The invention will be further explained by way of example with reference to the accompanying drawings.
Referring to the attached figure 1, a steam recovery system of a boiler blow-down flash tank comprises a boiler body 1, a blow-down flash tank 2 and a water-jet heat exchanger 3, the boiler comprises a demineralized water tank 4, a water mixer 5, a water supply pump unit 6 and a circulating water pump 7, wherein the water supply pump unit 6 is connected with the demineralized water tank 4 through a water supply pump unit water inlet pipeline 14, the boiler body 1 is connected with the water supply pump unit 6 through a water supply pipeline 8, a sewage discharge pipeline 9 led out from the boiler body 1 is connected with a sewage discharge flash tank 2, the circulating water pump 7 is connected with the demineralized water tank 4 through a circulating pump water inlet pipeline 15, the water side of a water jet heat exchanger 3 is connected with the circulating water pump 7 through a water jet heat exchanger water inlet pipeline 11, the steam side of the water jet heat exchanger 3 is connected with the sewage discharge flash tank 2 through a steam pipeline 10, the water jet heat exchanger 3 is connected with the water mixer 5 through a pipeline 12, and a demineralized water inlet pipeline 13.
In this embodiment, referring to fig. 1, an air-to-air discharge control valve 18 and a pressure relief safety valve 17 are installed at the top of the blowdown flash tank 2, a circulating water regulating valve 19 is installed on a water inlet side pipeline of the water jet heat exchanger 3, a water supply regulating valve 20 is installed on a demineralized water inlet pipeline 13, and a water supply regulating valve 16 is installed on a water supply pipeline 8; the water mixer 5 is installed inside the demineralized water tank 4 at a height lower than a normal operating water level of the demineralized water tank 4.
Claims (5)
1. The utility model provides a boiler blowdown flash tank vapor recovery system which characterized in that: comprises a boiler body (1), a sewage discharge flash tank (2), a water jet heat exchanger (3), a demineralized water tank (4), a water mixer (5), a water supply pump set (6) and a circulating water pump (7), wherein the water supply pump set (6) is connected with the demineralized water tank (4) through a water supply pump set water inlet pipeline (14), the boiler body (1) is connected with the water supply pump set (6) through a water supply pipeline (8), a sewage discharge pipeline (9) led out from the boiler body (1) is connected with the sewage discharge flash tank (2), the circulating water pump (7) is connected with the demineralized water tank (4) through a circulating pump water inlet pipeline (15), the water side of the water jet heat exchanger (3) is connected with the circulating water pump (7) through a water jet heat exchanger water inlet pipeline (11), the steam side of the water jet heat exchanger (3) is connected with the sewage discharge flash tank (2) through a steam pipeline (10), the water jet heat exchanger (3) is connected with the water mixer (5) through a pipeline (12), the desalted water inlet pipeline (13) is connected with the water mixer (5).
2. The flash tank vapor recovery system of claim 1, wherein: the water jet heat exchanger is characterized in that an air discharge control valve (18) and a pressure relief safety valve (17) are arranged on the sewage discharge flash tank (2), a circulating water regulating valve (19) is arranged on a water inlet pipeline (11) of the water jet heat exchanger, a water supplementing regulating valve (20) is arranged on a desalted water inlet pipeline (13), and a water supply regulating valve (16) is arranged on a water supply pipeline (8).
3. The flash tank vapor recovery system of claim 2, wherein: the empty discharge control valve (18) and the pressure relief safety valve (17) are arranged at the top of the sewage flash tank (2).
4. The flash tank vapor recovery system of claim 1, wherein: the water mixer (5) is arranged inside the demineralized water tank (4).
5. The flash tank vapor recovery system of claim 4, wherein: the height of the water mixer (5) is lower than the normal working water level of the demineralized water tank (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921224608.7U CN210772106U (en) | 2019-07-31 | 2019-07-31 | Steam recovery system of boiler blow-down flash tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921224608.7U CN210772106U (en) | 2019-07-31 | 2019-07-31 | Steam recovery system of boiler blow-down flash tank |
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| CN210772106U true CN210772106U (en) | 2020-06-16 |
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| CN201921224608.7U Active CN210772106U (en) | 2019-07-31 | 2019-07-31 | Steam recovery system of boiler blow-down flash tank |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112539406A (en) * | 2020-12-07 | 2021-03-23 | 江苏中伟机械制造有限公司 | A discharge flash tank for power plant discharges sewage |
| CN115301078A (en) * | 2022-06-30 | 2022-11-08 | 华电电力科学研究院有限公司 | Denitration system for pyrolyzing urea by utilizing energy of exhaust-heat boiler blowdown system |
| WO2023043605A1 (en) * | 2021-08-30 | 2023-03-23 | Energy Water Solutions, LLC | Geothermal heat retainment system and method for direct use in spray evaporation of water |
| US11998859B2 (en) | 2015-06-10 | 2024-06-04 | Energy Water Solutions, LLC | Compact containerized system and method for spray evaporation of water |
| US11998860B2 (en) | 2015-06-10 | 2024-06-04 | Energy Water Solutions, LLC | Geothermal heat retainment system and method for direct use in spray evaporation of water |
-
2019
- 2019-07-31 CN CN201921224608.7U patent/CN210772106U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11998859B2 (en) | 2015-06-10 | 2024-06-04 | Energy Water Solutions, LLC | Compact containerized system and method for spray evaporation of water |
| US11998860B2 (en) | 2015-06-10 | 2024-06-04 | Energy Water Solutions, LLC | Geothermal heat retainment system and method for direct use in spray evaporation of water |
| CN112539406A (en) * | 2020-12-07 | 2021-03-23 | 江苏中伟机械制造有限公司 | A discharge flash tank for power plant discharges sewage |
| CN112539406B (en) * | 2020-12-07 | 2023-12-19 | 江苏中伟机械制造有限公司 | Discharge expander for discharging sewage of power plant |
| WO2023043605A1 (en) * | 2021-08-30 | 2023-03-23 | Energy Water Solutions, LLC | Geothermal heat retainment system and method for direct use in spray evaporation of water |
| CN115301078A (en) * | 2022-06-30 | 2022-11-08 | 华电电力科学研究院有限公司 | Denitration system for pyrolyzing urea by utilizing energy of exhaust-heat boiler blowdown system |
| CN115301078B (en) * | 2022-06-30 | 2023-06-23 | 华电电力科学研究院有限公司 | Utilize exhaust-heat boiler drain energy pyrolysis urea's deNOx systems |
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