Steam recovery system

Abstract

The present disclosure relates to a steam extraction system, which comprises a shock wave extractor (1), a gas-liquid separator (2) and a boiler drain tank (6), the shock wave extractor (1) has a steam extraction inlet (11) for introducing steam extraction from the boiler drain tank into the shock wave extractor (1), a cooling water inlet (12) for introducing cooling water into the shock wave extractor (1), and a first outlet (13) in communication with an inlet (21) of the gas-liquid separator (2), a second outlet (22) of the gas-liquid separator (2) is in communication with a low-pressure heater (5) through a recovery pipeline (4). Through the above technical scheme, the steam extraction system can basically recover the heat and working medium of all the steam extraction, and will not affect the vacuum of the condenser.

Description

Technical Field

[0001] This disclosure pertains to the field of boiler technology and relates to a waste steam recovery system. Background Technology

[0002] Currently, boilers need to release exhaust steam into the environment during operation. This exhaust steam not only pollutes the environment but also corrodes existing operating equipment. Therefore, recovering the exhaust steam can avoid these problems and bring significant economic benefits.

[0003] In related technologies, current waste steam recovery systems include surface heat exchangers and water-sealed safety valves. The shell side of the surface heat exchanger is connected to the vent pipe of the boiler drain tank, while the tube side is connected to the condensate pump outlet. The water-sealed safety valve is installed on the vent pipe to seal off the vented waste steam. During waste steam recovery, the vented waste steam enters the shell side of the surface heat exchanger. The condensate pump pumps cooling water for cooling the waste steam into the tube side of the surface heat exchanger. The cooling water in the tube side is heated by the waste steam in the shell side and then returned to the boiler system. The waste steam in the shell side absorbs heat from the cooling water in the tube side and condenses into pure water, which flows by gravity into a storage tank connected to the shell side. The pure water in the storage tank needs to undergo a water quality test. If the water quality is acceptable, the pure water in the storage tank flows by gravity into the condenser; if the water quality is unacceptable, the pure water in the storage tank is directly discharged into the drain well of the boiler drain tank.

[0004] However, the problem with the aforementioned waste steam recovery system is that the waste steam recovery rate is not high. Summary of the Invention

[0005] The purpose of this invention is to provide a waste steam recovery system that can recover almost all the heat and working fluid of the waste steam without affecting the vacuum of the condenser.

[0006] To achieve the above objectives, this disclosure provides a waste steam recovery system, including a shock wave extractor, a gas-liquid separator, and a boiler condensate tank. The shock wave extractor has a waste steam inlet, a cooling water inlet, and a first outlet. The waste steam inlet is used to introduce waste steam from the boiler condensate tank into the shock wave extractor, and the cooling water inlet is used to introduce cooling water into the shock wave extractor. The first outlet is connected to the inlet of the gas-liquid separator, and the second outlet of the gas-liquid separator is connected to a low-pressure heater through a recovery pipeline.

[0007] Optionally, the cooling water inlet is connected to the outlet of the fine treatment device via a first pipeline, the fine treatment device being used to finely treat the condensate from the condensate pump.

[0008] Optionally, the waste steam recovery system includes a water-sealed safety valve, which is installed in the drain pipe of the boiler condensate tank and is connected to the first pipeline via a second pipeline.

[0009] Optionally, a flow meter located downstream of the second pipeline is installed on the first pipeline.

[0010] Optionally, the recycling pipeline is equipped with a pumping device, and the number of pumping devices is at least two, with at least two pumping devices connected in parallel on the recycling pipeline.

[0011] Optionally, each pumping device is equipped with a pre-pump shut-off valve at its inlet and a post-pump shut-off valve at its outlet.

[0012] Optionally, the recovery pipeline is provided with a first check valve connected to each of the pumping devices, and the first check valve is located between the corresponding pumping device and the pump-off valve.

[0013] Optionally, a second check valve is provided on the recovery pipeline, and the second check valve is arranged close to the low-pressure heater.

[0014] Optionally, a sampling pipeline is connected to the recovery pipeline, and the sampling pipeline is arranged between the pumping device and the second outlet.

[0015] Optionally, the recovery pipeline is equipped with a pressure gauge and / or a thermometer.

[0016] Through the above technical solution, the exhaust steam recovery system provided in this disclosure, before use, firstly connects the exhaust steam inlet of the shock wave extractor to the vent pipe of the boiler drain tank, and connects the cooling water inlet of the shock wave extractor to the cooling water source. The shock wave extractor uses cooling water jets to create a jet flow that draws in the exhaust steam. The cooling water and the exhaust steam's heat and mass are directly mixed, the cooling water is heated, and the exhaust steam's heat energy and working fluid are absorbed by the cooling water. The mixture of cooling water and exhaust steam flows out through the first outlet of the shock wave extractor and into the gas-liquid separator through the inlet. Insoluble gases and dissolved oxygen in the mixture are discharged through the automatic exhaust valve at the top of the gas-liquid separator. The remaining mixture forms recovered water, which flows into the recovery pipeline through the second outlet of the gas-liquid separator. Finally, the recovered water enters the low-pressure heater. Thus, it is possible to recover almost all the heat and working fluid of the exhaust steam, effectively solving the problem of low exhaust steam recovery rate. Furthermore, since the temperature difference between the liquid in the low-pressure heater and the recovered water is small, introducing the recovered water into the low-pressure heater through the recovery pipeline can reduce energy loss during the recovery process. Furthermore, compared to the method of introducing recycled water into the condenser, the method of introducing recycled water into the low-pressure heater will not affect the vacuum of the condenser.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of a waste steam recovery system provided according to an embodiment of the present disclosure.

[0020] Explanation of reference numerals in the attached figures

[0021] 1-Shock wave suction device; 11-Exhaust steam inlet; 12-Cooling water inlet; 13-First outlet; 14-First pipeline; 15-Flow meter; 2-Gas-liquid separator; 21-Inlet; 22-Second outlet; 23-Automatic exhaust valve; 3-Water seal safety valve; 31-Second pipeline; 32-Third pipeline; 33-Wastewater tank; 4-Recovery pipeline; 41-Pumping device; 42-Pump inlet shut-off valve; 43-Pump outlet shut-off valve; 44-First check valve; 45-Second check valve; 46-Sampling pipeline; 47-Manual valve; 48-Electric valve; 5-Low-pressure heater; 6-Boiler drain tank; 61-Drain pipe; 62-Fourth pipeline; 7-Pressure gauge; 8-Thermometer; 9-Fine treatment device; 91-Condensate pump. Detailed Implementation

[0022] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0023] In this disclosure, unless otherwise stated, the terms "first," "second," etc., are used to distinguish one element from another and do not have sequential or material significance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements.

[0024] According to a specific embodiment of this disclosure, a waste steam recovery system is provided, with reference to... Figure 1 As shown, the waste steam recovery system includes a shock wave extractor 1, a gas-liquid separator 2, and a boiler condensate tank 6. The shock wave extractor 1 has a waste steam inlet 11, a cooling water inlet 12, and a first outlet 13. The waste steam inlet 11 is used to introduce waste steam from the boiler condensate tank 6 into the shock wave extractor 1. The cooling water inlet 12 is used to introduce cooling water into the shock wave extractor 1. The first outlet 13 is connected to the inlet 21 of the gas-liquid separator 2. The second outlet 22 of the gas-liquid separator 2 is connected to the low-pressure heater 5 through a recovery pipeline 4. It should be noted that, according to reference... Figure 1As shown, the exhaust steam inlet 11 is connected to the drain pipe 61 of the boiler drain tank 6 via the fourth pipe 62, thereby injecting the exhaust steam in the boiler drain tank 6 into the shock wave suction device 1.

[0025] Through the above technical solution, the exhaust steam recovery system provided in this disclosure, before use, firstly connects the exhaust steam inlet 11 of the shock wave extractor 1 to the drain pipe 61 of the boiler drain tank 6, and connects the cooling water inlet 12 of the shock wave extractor 1 to the cooling water source. The shock wave extractor 1 uses cooling water jets to generate jet flow to extract the exhaust steam. The cooling water and the exhaust steam's heat and mass are directly mixed. The cooling water is heated, and the exhaust steam's heat energy and working fluid are absorbed by the cooling water. The mixture of cooling water and exhaust steam flows out through the first outlet 13 of the shock wave extractor 1 and flows into the gas-liquid separator 2 through the inlet 21 of the gas-liquid separator 2. The insoluble gases and dissolved oxygen in the mixture are discharged through the automatic exhaust valve 23 at the top of the gas-liquid separator 2. The remaining mixture forms recovery water which flows into the recovery pipeline 4 through the second outlet 22 of the gas-liquid separator 2. Finally, the recovery water enters the low-pressure heater 5. Thus, it is possible to basically recover all the heat and working fluid of the exhaust steam, effectively solving the problem of low exhaust steam recovery rate. Furthermore, since the temperature difference between the liquid inside the low-pressure heater 5 and the recycled water is small, introducing the recycled water into the low-pressure heater 5 through the recycling pipeline 4 can reduce energy loss during the recycling process. In addition, compared to introducing the recycled water into the condenser, introducing the recycled water into the low-pressure heater 5 will not affect the vacuum of the condenser.

[0026] It should be noted that "low-pressure heater" is a technical term in the field of thermal power generation, which is well known to those skilled in the art, and will not be elaborated upon in this disclosure.

[0027] In an exemplary embodiment of this disclosure, reference is made to Figure 1 As shown, the cooling water inlet 12 is connected to the outlet of the fine treatment device 9 via the first pipe 14. The fine treatment device 9 is used to finely treat the condensate from the condensate pump 91. It should be noted that the fine treatment device 9 is mainly used to remove metal corrosion products, trace dissolved salts, and suspended solids from the condensate, thus ensuring the quality of the cooling water, improving the quality of the recycled water, and ensuring that the recycled water can be directly fed into the low-pressure heater. Of course, the cooling water inlet can also be connected to other water supply devices; for example, the cooling water inlet can be directly connected to the outlet of the cooling water pump.

[0028] In some embodiments of this disclosure, reference is made to Figure 1As shown, the waste steam recovery system may also include a water-sealed safety valve 3. The water-sealed safety valve 3 is installed in the drain pipe 61 of the boiler drain tank 6, and is connected to the first pipe 14 via a second pipe 31. Thus, when water is injected into the water-sealed safety valve 3, water from the fine treatment device 9 can flow into the water-sealed safety valve 3 through the first pipe 14 and the second pipe 31, which is very convenient. Here, the function of the water-sealed safety valve 3 is to block the drain pipe 61 during the operation of the waste steam recovery system, ensuring that the waste steam in the boiler drain tank 6 flows into the shock wave extractor 1 through the fourth pipe 62. Of course, the water-sealed safety valve 3 can also be replenished with water through other devices. For example, the water-sealed safety valve 3 may have a dedicated water replenishment pump, and the water inlet of the water-sealed safety valve 3 may be directly connected to the water replenishment pump. Additionally, see reference... Figure 1 As shown, a third pipe 32 is connected to the outlet of the water seal safety valve 3. The third pipe 32 is connected to the recovery pipe 4, and a branch line connected to the wastewater tank 33 is provided on the third pipe 32. When the water seal safety valve 3 drains, if the liquid in the water seal safety valve 3 meets the recovery requirements, the liquid enters the recovery pipe 4 through the third pipe 32 to complete the recovery; otherwise, it flows into the wastewater tank 33 through the branch line.

[0029] Optionally, refer to Figure 1 As shown, a flow meter 15 is installed on the first pipe 14, located downstream of the second pipe 31. This allows for accurate measurement of the amount of cooling water flowing into the shock wave suction unit 1, helping operators to more precisely control the water inflow into the shock wave suction unit 1. Additionally, refer to... Figure 1 As shown, the first pipeline 14 is also equipped with a manual valve 47 and an electric valve 48 to control the on / off state of the first pipeline 14. Furthermore, see reference... Figure 1 As shown, a pressure gauge 7 and a thermometer 8 may also be installed on the first pipeline 14.

[0030] In an exemplary embodiment of this disclosure, reference is made to Figure 1 As shown, the recovery pipeline 4 is equipped with two pumping devices 41 connected in parallel. This allows for efficient energy reduction: when the flow rate in the recovery pipeline 4 is low, only one pumping device 41 is activated; when the flow rate is high, both pumping devices 41 are activated simultaneously. Furthermore, the parallel connection of the two pumping devices 41 also allows the other pumping device 41 to serve as a backup in case one fails, ensuring the normal operation of the waste steam recovery system. Of course, the number of pumping devices 41 can also be more than two; for example, five pumping devices 41 connected in parallel on the recovery pipeline 4.

[0031] In some embodiments of this disclosure, reference is made to Figure 1As shown, each pumping device 41 is equipped with a pre-pump on / off valve 42 at its inlet and a post-pump on / off valve 43 at its outlet. In this way, by controlling the opening and closing of the pre-pump on / off valve 42 and the post-pump on / off valve 43, the on / off of each branch can be controlled, and the maintenance of the pumping device 41 can also be facilitated.

[0032] Optionally, refer to Figure 1 As shown, the recovery pipeline 4 is equipped with a first check valve 44 connected to each pumping device 41. The first check valve 44 is located between the corresponding pumping device 41 and the post-pump on / off valve 43. In this way, the recovered water can be prevented from flowing back into the pumping device 41 through the outlet of the pumping device 41, thereby preventing damage to the pumping device 41.

[0033] Optionally, refer to Figure 1 As shown, a second check valve 45 is provided on the recovery line 4, and the second check valve 45 is arranged close to the low-pressure heater 5. In this way, liquid in the low-pressure heater 5 can be prevented from flowing back into the recovery line 4.

[0034] Optionally, refer to Figure 1 As shown, a sampling pipeline 46 is connected to the recovery pipeline 4, and the sampling pipeline 46 is arranged between the pumping device 41 and the second outlet 22. Before injecting the recovered water into the low-pressure heater 5, the recovered water in the recovery pipeline 4 can be sampled through the sampling pipeline 46, and the sampled water can be tested to ensure that the water quality meets the recovery requirements before being injected into the low-pressure heater 5. In addition, the sampling pipeline 46 is arranged between the pumping device 41 and the second outlet 22 to prevent the recovered water from entering the pumping device 41 during sampling, thus eliminating the possibility of contamination of the pumping device 41 due to unqualified recovered water.

[0035] Optionally, refer to Figure 1 As shown, a pressure gauge 7 and a thermometer 8 are installed on the recovery pipeline 4. This allows the pressure inside the recovery pipeline 4 to be monitored by the pressure gauge 7, and the temperature of the recovered water inside the recovery pipeline 4 to be monitored by the thermometer 8. Of course, depending on actual needs, only the pressure gauge 7 or only the thermometer 8 can be installed on the recovery pipeline 4. Additionally, refer to... Figure 1 As shown, the recovery pipeline 4 is equipped with a manual valve 47 and an electric valve 48 for controlling the opening and closing of the recovery pipeline 4.

[0036] The following is a detailed description of the operation of the waste steam recovery system in conjunction with the above specific embodiments. Specifically, the operation of the waste steam recovery system is as follows: First, the waste steam in the boiler drain tank 6 is introduced into the shock wave extractor 1 through the fourth pipe 62. At the same time, the condensate in the fine treatment device 9 is introduced into the shock wave extractor 1 through the first pipe 14. The shock wave extractor 1 uses condensate spray to generate jet flow to extract the waste steam. The condensate and the heat of the waste steam are directly mixed. The heat energy and working fluid of the waste steam are absorbed by the condensate. The mixture of condensate and waste steam flows out through the first outlet 13 of the shock wave extractor 1 and flows into the gas-liquid separator 2 through the inlet 21. The insoluble gases and dissolved oxygen in the mixture are discharged through the automatic exhaust valve 23 at the top of the gas-liquid separator 2. The remaining mixture forms recovered water and flows into the recovery pipe 4 through the second outlet 22 of the gas-liquid separator 2. Finally, the recovered water enters the low-pressure heater 5, realizing the basic recovery of all the heat and working fluid of the waste steam.

[0037] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0038] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0039] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A waste steam recovery system, characterized in that, The device includes a shock wave extractor, a gas-liquid separator, and a boiler condensate tank. The shock wave extractor has a waste steam inlet, a cooling water inlet, and a first outlet. The waste steam inlet is used to introduce waste steam from the boiler condensate tank into the shock wave extractor. The cooling water inlet is used to introduce cooling water into the shock wave extractor. The first outlet is connected to the inlet of the gas-liquid separator. The second outlet of the gas-liquid separator is connected to a low-pressure heater through a recovery pipeline.

2. The waste steam recovery system according to claim 1, characterized in that, The cooling water inlet is connected to the outlet of the fine treatment device through a first pipeline. The fine treatment device is used to finely treat the condensate from the condensate pump.

3. The waste steam recovery system according to claim 2, characterized in that, The waste steam recovery system includes a water-sealed safety valve, which is installed in the drain pipe of the boiler drain tank and is connected to the first pipeline through a second pipeline.

4. The waste steam recovery system according to claim 3, characterized in that, A flow meter is installed on the first pipeline, located downstream of the intersection of the first pipeline and the second pipeline.

5. The waste steam recovery system according to claim 1, characterized in that, The recycling pipeline is equipped with a pumping device, and the number of pumping devices is at least two, with at least two pumping devices connected in parallel on the recycling pipeline.

6. The waste steam recovery system according to claim 5, characterized in that, Each pumping device is equipped with a pre-pump shut-off valve at its inlet and a post-pump shut-off valve at its outlet.

7. The waste steam recovery system according to claim 6, characterized in that, The recovery pipeline is equipped with a first check valve that communicates with each of the pumping devices. The first check valve is located between the corresponding pumping device and the pump-off valve.

8. The waste steam recovery system according to claim 1, characterized in that, The recovery pipeline is equipped with a second check valve, which is located near the low-pressure heater.

9. The waste steam recovery system according to claim 5, characterized in that, A sampling pipeline is connected to the recovery pipeline, and the sampling pipeline is arranged between the pumping device and the second outlet.

10. The waste steam recovery system according to claim 1, characterized in that, The recovery pipeline is equipped with a pressure gauge and / or a thermometer.

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