CN-116447891-B - Exhaust steam recovery system

Abstract

The utility model relates to a dead steam recovery system, dead steam recovery system include shock aspirator (1), gas-liquid separator (2) and boiler hydrophobic tank (6), shock aspirator (1) have dead steam entry (11), cooling water entry (12) and first export (13), dead steam entry (11) are used for to introduce in shock aspirator (1) comes from the dead steam of boiler hydrophobic tank, cooling water entry (12) are used for to introduce cooling water in shock aspirator (1), first export (13) with inlet (21) intercommunication of gas-liquid separator (2), second export (22) of gas-liquid separator (2) are through recovery pipeline (4) and low pressure heater (5) intercommunication. Through the technical scheme, the exhaust steam recovery system can basically recover heat and working media of all exhaust steam, and the vacuum of the condenser cannot be influenced.

Inventors

• ZHANG LIQIANG
• YANG MING
• YANG MIN
• LIN DEPING
• Wu baoyang
• XIAO WEIWEI
• GUO MINGYUAN
• GUO KAIHUA
• DOU QIANG

Assignees

• 国家能源集团山西电力有限公司
• 山西鲁晋王曲发电有限责任公司

Dates

Publication Date

20260508

Application Date

20230504

Claims (10)

1. 1. The utility model provides a dead steam recovery system, its characterized in that includes shock wave aspirator, gas-liquid separator and boiler hydrophobic box, the shock wave aspirator has dead steam entry, cooling water entry and first export, the dead steam entry is used for to introduce to in the shock wave aspirator the dead steam from the boiler hydrophobic box, the cooling water entry is used for to introduce cooling water in the shock wave aspirator, first export with gas-liquid separator's entry intercommunication, gas-liquid separator's second export communicates with low-pressure heater through retrieving pipeline.
2. 2. The exhaust steam recovery system of claim 1, wherein the cooling water inlet communicates with a water outlet of a polishing device through a first pipe, the polishing device being configured to polish condensate from a condensate pump.
3. 3. The exhaust steam recovery system of claim 2, wherein the exhaust steam recovery system comprises a water seal relief valve disposed in an evacuation pipe of the boiler hydrophobic tank, the water seal relief valve being in communication with the first pipeline via a second pipeline.
4. 4. The exhaust steam recovery system of claim 3, wherein a flow meter is disposed on the first conduit downstream of an intersection of the first conduit and the second conduit.
5. 5. The exhaust steam recovery system according to claim 1, wherein pumping devices are arranged on the recovery pipeline, the number of the pumping devices is at least two, and at least two pumping devices are arranged in parallel on the recovery pipeline.
6. 6. The exhaust steam recovery system according to claim 5, wherein the water inlet of each pumping device is provided with a front pump on-off valve, and the water outlet of each pumping device is provided with a rear pump on-off valve.
7. 7. The exhaust steam recovery system of claim 6, wherein a first check valve is provided on the recovery line in communication with each pumping device, the first check valve being disposed between the corresponding pumping device and the post-pump on-off valve.
8. 8. The exhaust steam recovery system of claim 1, wherein a second check valve is provided on the recovery line, the second check valve being disposed proximate the low pressure heater.
9. 9. The exhaust steam recovery system of claim 5, wherein a sampling line is in communication with the recovery line, the sampling line being disposed between the pumping device and the second outlet.
10. 10. The exhaust steam recovery system according to claim 1, wherein a pressure gauge and/or a temperature gauge is provided on the recovery line.

Description

Exhaust steam recovery system Technical Field The disclosure belongs to the technical field of boilers and relates to a dead steam recovery system. Background At present, the boiler needs to discharge exhaust steam to the environment in the operation process, and the exhaust steam discharge not only can pollute the environment, but also can cause certain corrosion to the existing operation equipment. Therefore, the exhaust steam is recycled, so that the problems can be avoided, and good economic benefits can be brought. In the related art, the current exhaust steam recovery system comprises a surface heat exchanger and a water seal safety valve, wherein the shell side of the surface heat exchanger is communicated with an emptying pipe of a boiler hydrophobic tank, the tube side of the surface heat exchanger is communicated with a condensing pump outlet of a unit, and the water seal safety valve is arranged on the emptying pipe and is used for plugging the exhaust steam in the emptying pipe. When the dead steam is recovered, the exhausted steam is emptied and enters the shell pass of the surface heat exchanger, the unit condensation pump pumps the cooling water for cooling the dead steam into the tube pass of the surface heat exchanger, the cooling water in the tube pass is heated by the dead steam in the shell pass and then is recovered into the boiler system, the dead steam in the shell pass is condensed into pure water after being absorbed by the cooling water in the tube pass, the pure water in the water storage tank automatically flows into a water storage tank connected with the shell pass, the pure water in the water storage tank needs to pass through quality qualification detection, if the water quality is qualified, the pure water in the water storage tank automatically flows into the condenser, and if the water quality is unqualified, the pure water in the water storage tank is directly discharged into a drain well of a boiler drain tank. However, the above-mentioned exhaust steam recovery system has a problem in that the exhaust steam recovery rate is not high. Disclosure of Invention The invention aims to provide a waste steam recovery system which can basically recover heat and working media of all waste steam and does not influence vacuum of a condenser. In order to achieve the above object, the present disclosure provides a dead steam recovery system, including a shock absorber, a gas-liquid separator and a boiler hydrophobic tank, the shock absorber has a dead steam inlet for introducing the dead steam from the boiler hydrophobic tank into the shock absorber, a cooling water inlet for introducing the cooling water into the shock absorber, and a first outlet communicated with the inlet of the gas-liquid separator, and a second outlet communicated with a low pressure heater through a recovery pipeline. Optionally, the cooling water inlet is communicated with a water outlet of a finishing device through a first pipeline, and the finishing device is used for finishing the condensate from the condensate pump. Optionally, the exhaust steam recovery system comprises a water seal safety valve, the water seal safety valve is arranged on an emptying pipe of the boiler hydrophobic tank, and the water seal safety valve is communicated with the first pipeline through a second pipeline. Optionally, a flowmeter downstream of the second pipeline is arranged on the first pipeline. Optionally, pumping devices are arranged on the recovery pipeline, the number of the pumping devices is at least two, and at least two pumping devices are arranged in parallel on the recovery pipeline. Optionally, a front pump on-off valve is arranged at the water inlet of each pumping device, and a rear pump on-off valve is arranged at the water outlet of each pumping device. Optionally, a first check valve communicated with each pumping device is arranged on the recovery pipeline, and the first check valve is arranged between the corresponding pumping device and the back on-off valve of the pump. Optionally, a second check valve is provided on the recovery line, the second check valve being arranged close to the low pressure heater. Optionally, a sampling pipeline is communicated with the recovery pipeline, and the sampling pipeline is arranged between the pumping device and the second outlet. Optionally, a pressure gauge and/or a thermometer is arranged on the recovery pipeline. Through the technical scheme, before the exhaust steam recovery system provided by the disclosure is used, firstly, the exhaust steam inlet of the shock wave aspirator is communicated with the emptying pipe of the boiler hydrophobic tank, the cooling water inlet of the shock wave aspirator is communicated with the cooling water source, the shock wave aspirator is utilized to enable cooling water to jet and suck exhaust steam to generate jet and suck the exhaust steam, the cooling water is directly mixed with the thermal mass of the exhaust steam, the cool