Power plant vacuumizing system strengthening device
By setting up a mixing cooler and cooling water spray assembly at the inlet of the water ring vacuum pump, the wet steam in the condenser is condensed in advance, solving the problem of large overflow of wet steam during the vacuum pump of the water ring vacuum pump, realizing the recycling of wet steam, and reducing the water consumption of the system.
Patent Information
- Application Number
- CN202421348030.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-06-13
AI Technical Summary
During the vacuuming process of the existing water ring vacuum pump in thermal power plants, the wet steam in the condenser will be extracted, resulting in an increase in overflow, which will in turn require increasing the system's water replenishment rate.
A mixing cooler is installed at the inlet of the water ring vacuum pump, and a cooling water spray assembly is installed on the top of it. The cooling water is sprayed into the mixing cooler, contacts and exchanges heat with the wet steam in the non-condensing gas, condenses the wet steam in advance, and flows into the water drain line through the drain pipe.
The wet steam in the non-condensable gas is effectively recovered, the overflow rate of the water ring vacuum pump and the water replenishment rate of the power generation system are reduced, and the water consumption of the entire system is reduced.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of power generation equipment, and in particular to a vacuum system strengthening device for a power plant. Background Art
[0002] In thermal power plants, the condenser of the steam turbine generator set operates under vacuum conditions. One of the main functions of the steam turbine condenser is to ensure the vacuum condition of the generator set. The vacuum degree of the condenser will directly affect the coal or gas efficiency of the steam turbine set. At present, the common condenser vacuum pumping system in thermal power plants is mostly a water ring vacuum pump. The main function of this vacuum pumping system is to continuously extract the non-condensable gas in the condenser during continued operation. Otherwise, the vacuum degree will be reduced due to the leakage of incompressible non-condensable gas into the condenser, affecting the coal or gas efficiency of the steam turbine set.
[0003] The overflow of the water ring vacuum pump is relatively large in actual operation, mainly because when the water ring vacuum pump inhales non-condensable gas from the condenser, some excess wet steam will also be extracted from the condenser. These wet steam contain more water, which will condense into water after passing through the water ring vacuum pump and be discharged from the outlet of the water ring vacuum pump. Under normal circumstances, this phenomenon will not affect the normal operation of the pump, but in order to replenish this part of the lost water, the water replenishment rate of the entire system will be increased. Utility Model Content
[0004] The present application provides a power plant vacuum system strengthening device, which can condense excess wet steam in non-condensable gas before the non-condensable gas enters the water ring vacuum pump, thereby avoiding an increase in water consumption of the entire system after the wet steam with a large water content is pumped away.
[0005] The above-mentioned purpose of the present application is achieved through the following technical solutions:
[0006] A power plant vacuum system strengthening device, comprising a water ring vacuum pump, characterized in that: the inlet of the water ring vacuum pump is connected to a mixing cooler through a suction pipe, and the mixing cooler is connected to a condenser through a gas collecting pipe;
[0007] A cooling water spray assembly is provided on the top of the mixing cooler, and the cooling water spray assembly is connected to the cooling water supply pipeline of the power plant, and the cooling water spray assembly can spray cooling water evenly into the mixing cooler;
[0008] The bottom of the mixing cooler is connected to the drain pipeline of the power plant through a drain pipe.
[0009] Furthermore, the cooling water spray assembly includes a spray pipe, one end of which is connected to the cooling water supply pipeline of the power plant, and the other end of the spray pipe is connected to a plurality of spray branches through a water distributor, and the water outlet ends of the plurality of spray branches extend from the top plate of the mixing cooler to the interior thereof.
[0010] Furthermore, a spray head is installed at the water outlet end of the spray branch pipe.
[0011] Furthermore, a solenoid valve is installed on the pipe body of the spray branch pipe located outside the mixing cooler.
[0012] Furthermore, the mixing cooler is cylindrical in shape, and the ratio of its height to diameter is not less than 2:1.
[0013] Furthermore, the connection point between the suction pipe and the mixing cooler is close to the lower end of the mixing cooler.
[0014] Furthermore, temperature sensors are provided inside and outside the mixing cooler.
[0015] In summary, the present application includes at least one of the following beneficial technical effects:
[0016] The mixing cooler provided at the inlet of the water ring vacuum pump in the present application can allow the non-condensable gas containing wet steam to enter the mixing cooler before entering the water ring vacuum pump. Since the cooling water spray assembly provided on the top of the mixing cooler can spray cooling water into the mixing cooler, the cooling water will contact and exchange heat with the excess wet steam in the non-condensable gas in the mixing cooler, thereby condensing the wet steam with a higher water content in advance, condensing them into water droplets in the mixing cooler and then flowing into the drain line of the power plant through the drain pipe at the bottom of the mixing cooler, and then gathering into the condensate tank together with other condensate discharged from the condenser, thereby achieving the purpose of recovering condensate. Since the present application effectively recycles the wet steam with a higher water content in the non-condensable gas, the water consumption of the entire system is effectively reduced compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 It is a top view of the overall structure of the present application;
[0019] Figure 2It is a schematic diagram of the structure of the mixing cooler of the present application after being cut open;
[0020] Figure 3 It is a side view of the overall structure of the present application;
[0021] Figure 4 This is a top view of the entire air cooling system after the application is installed in the air cooling system of a power plant.
[0022] Figure numerals: 1. water ring vacuum pump; 2. suction pipe; 3. mixing cooler; 4. gas collecting pipe; 5. cooling water spray assembly; 51. spray pipe; 52. water distributor; 53. spray branch pipe; 6. drain pipe; 7. spray head; 8. solenoid valve. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.
[0024] like Figure 1-Figure 4 As shown, a power plant vacuum system strengthening device disclosed in the present application includes a water ring vacuum pump 1, the inlet of the water ring vacuum pump 1 is connected to the mixing cooler 3 through a suction pipe 2, and the mixing cooler 3 is connected to the condenser through a gas collecting pipe 4; a cooling water spray assembly 5 is provided on the top of the mixing cooler 3, and the cooling water spray assembly 5 is connected to the cooling water supply pipeline of the power plant. The cooling water spray assembly 5 can spray cooling water evenly into the mixing cooler 3; the bottom of the mixing cooler 3 is connected to the drain pipeline of the power plant through a drain pipe 6.
[0025] In the above embodiments, the condenser in the power plant is mainly responsible for condensing the exhaust steam discharged from the steam turbine into condensed water, wherein the condensed water produced by the condenser will be uniformly discharged to the condensate tank through the drain pipeline arranged in the air-cooling tower of the power plant. The condensate tank can then reuse the collected condensate and transport it to the corresponding water-using equipment or pipelines in the power plant, thereby recycling the water resources in the power plant. Figure 4As shown, there will be some non-condensable gases in the condenser during operation, which will affect its vacuum degree. Therefore, multiple water ring vacuum pumps 1 are often set in the middle of the bottom of the air cooling tower. Multiple water ring vacuum pumps 1 can evacuate multiple condensers in the air cooling tower through the gas collecting pipe 4, so as to timely extract the non-condensable gases in the condenser to ensure the vacuum degree of the condenser. However, the existing water ring vacuum pump 1 often extracts some wet steam (steam with a high water content) in the condenser when extracting these non-condensable gases. In this way, when the water ring vacuum pump 1 discharges non-condensable gases during operation, the wet steam will be discharged from its outlet together. The overflow of the water ring vacuum pump 1 may increase. Due to the loss of wet steam, in order to ensure the normal operation of the entire power generation system, it is necessary to increase the water replenishment rate of the system.
[0026] The present application adds a mixing cooler 3 between the water ring vacuum pump 1 and the gas collecting pipe 4, and the mixing cooler 3 is connected to the inlet of the water ring vacuum pump 1 through the suction pipe 2, so that when the water ring vacuum pump 1 is working, the non-condensable gas collected from the condenser by the gas collecting pipe 4 will flow into the mixing cooler 3 before entering the water ring vacuum pump 1; the cooling water spray assembly 5 arranged on the top of the mixing cooler 3 can obtain cooling water from the cooling water supply pipeline (the cooling water supply pipeline can provide the cooling water spray assembly 5 with demineralized water, and the operating pressure is 0. 5Mpa, flow rate 15-30t / h, temperature below 20℃), and the obtained cooling water is uniformly sprayed into the mixing cooler 3, and the cooling water will come into contact with the excess wet steam in the non-condensable gas in the mixing cooler 3. The wet steam will condense into water droplets due to heat exchange with the cooling water. These water droplets will flow into the drain pipeline of the power plant from the bottom of the mixing cooler and then flow into the condensate tank together for subsequent reuse. The non-condensable water vapor that cannot produce condensate will be sucked away by the water ring vacuum pump 1 through the suction pipe 2. Compared with the prior art, the mixing cooler 3 and the cooling water spraying assembly 5 set in front of the inlet of the water ring vacuum pump 1 in the present application can condense the excess wet steam extracted from the condenser of the water ring vacuum pump 1 in advance by spraying cooling water, and then collect it into the condensate tank through the drain pipeline, so as to achieve the purpose of recycling the excess wet steam in the non-condensable gas, and effectively reduce the overflow of the water ring vacuum pump 1 and the water replenishment rate of the power generation system.
[0027] Furthermore, if Figure 1 and Figure 2 As shown, the cooling water spray assembly 5 includes a spray pipe 51, one end of which is connected to the cooling water supply pipeline of the power plant, and the other end of the spray pipe 51 is connected to a plurality of spray branches 53 through a water distributor 52, and the water outlet ends of the plurality of spray branches 53 extend from the top plate of the mixing cooler 3 to the interior thereof.
[0028] In the above embodiments, the spray pipe 51 is connected to the cooling water supply pipeline at the power plant site, so that the cooling water supply pipeline can provide the necessary cooling water resources for the spray pipe 51. The spray pipe 51 can evenly distribute the water resources to multiple spray branches 53 through the water distributor 52 (the water distributor 52 has a water inlet and multiple water outlets, and the number of water outlets is equal to the number of spray branches 53). The water outlet ends of the multiple spray branches 53 are located inside the mixing cooler 3. Therefore, the water sprayed from the multiple spray branches 53 can effectively exchange heat with the wet steam in the non-condensable gas inside the mixing cooler 3, thereby cooling and condensing it.
[0029] In addition, when the spray pipe 51 of the present application is actually used, the user can provide a suitable fixing bracket for the spray pipe 51 as needed to ensure the stability of the spray pipe 51 during operation.
[0030] Furthermore, if Figure 2 As shown, a spray head 7 is installed at the water outlet end of the spray branch pipe 53.
[0031] In the above embodiment, a spray head 7 is provided at the water outlet end of the spray branch pipe 53, so that the water sprayed from the spray branch pipe 53 can be more evenly distributed in the mixing cooler 3, so that the contact area between the cooling water and the wet steam in the non-condensable gas in the mixing cooler 3 can be effectively increased, thereby improving the heat exchange efficiency between the cooling water and the wet steam, so that it can be quickly cooled and condensed.
[0032] Furthermore, if Figure 1 As shown, a solenoid valve 8 is installed on the pipe body of the spray branch pipe 53 located outside the mixing cooler 3.
[0033] In the above embodiment, the solenoid valve 8 is provided on the spray branch pipe 53 to facilitate the technicians to control the opening number of the spray branch pipe 53 according to the needs in actual use, which effectively improves the flexibility of the application in use.
[0034] Furthermore, if Figure 1-Figure 3 As shown, the mixing cooler 3 is cylindrical in shape, and the ratio of its height to diameter is not less than 2:1.
[0035] In the above embodiment, the mixing cooler 3 of the present application is set to be cylindrical, which is simpler to manufacture than the rectangular structure, and the condensed water flows more smoothly downward. The height and diameter ratio of the mixing cooler 3 of the present application are set in the above manner, which can increase the path length of the water sprayed from the spray branch 53 when it moves along the mixing cooler 3 to the drain pipe 6, thereby increasing the contact time between the cooling water and the wet steam, thereby improving the condensation effect.
[0036] Furthermore, if Figure 2 and Figure 3As shown, the connection point between the suction pipe 2 and the mixing cooler 3 is close to the lower end of the mixing cooler 3 .
[0037] In the above embodiment, the connection point between the suction pipe 2 and the mixing cooler 3 is set in the area near the lower end of the mixing cooler 3, so that when the suction pipe 2 sucks the non-condensable gas in the mixing cooler 3, it will have a certain distance from the water outlet end of the upper spray branch pipe 53, so as to ensure that the gas extracted by the suction pipe 2 is treated by the cooling water sprayed from the spray branch pipe 53, and prevent the suction pipe 2 from sucking away the wet steam that has not been fully in contact with the cooling water. In addition, the water sprayed from the spray branch pipe 53 and the condensed water of the wet steam will collide and gather to form relatively large water droplets in the process of falling, and the weight of these large water droplets will also be relatively large. Correspondingly, when the suction pipe 2 sucks the non-condensable gas, it is difficult to suck away these condensed large water droplets, so that the condensed water in the mixing cooler 3 will not be easily lost.
[0038] Furthermore, temperature sensors are provided inside and outside the mixing cooler 3 .
[0039] In the above embodiment, it is convenient for technicians to control the opening number of the spray branch pipes 53 according to the temperature of the internal and external environments of the mixing cooler 3. The temperature sensor of the present application is not shown in the drawings.
[0040] The implementation principle of this embodiment is: when the power generation system is operating normally, multiple water ring vacuum pumps 1 installed in the air cooling tower will start. Since the working principles of multiple water ring vacuum pumps 1 are the same, only one of the working principles of the water ring vacuum pumps 1 will be described here. When the water ring vacuum pump 1 is working, a suction force will be generated, and the suction force will first act on the condenser through the gas collection pipe 4, thereby extracting the non-condensable gas in the condenser. The non-condensable gas extracted in this process will contain excess wet steam. Since the suction pipe 2 at the inlet of the water ring vacuum pump 1 is connected to the gas collection pipe 4 by the mixing cooler 3, these gases will first reach the mixing cooler 3 before entering the water ring vacuum pump 1. The spray pipe 51 at the top of the mixing cooler 3 can obtain cooling water from the cooling water supply pipeline of the power plant, and evenly spray the cooling water into the mixing cooler 3 through the spray branch pipe 53. The cooling water will contact and exchange heat with the excess wet steam in the non-condensable gas in the mixing cooler 3 during the descending process, thereby cooling and condensing the wet steam with a large water content, turning them into water droplets in the mixing cooler 3 and then flowing into the drain pipeline of the power plant through the drain pipe 6 at the bottom of the mixing cooler 3, and then gathering into the condensate tank together with other condensate discharged from the condenser, thereby achieving the purpose of recovering condensate. Since the present application effectively recycles the wet steam with a large water content in the non-condensable gas, the water consumption of the entire system is effectively reduced compared with the prior art, and the multiple water ring vacuum pumps 1 in the power plant can realize the recovery of water in the non-condensable gas according to this principle, which obviously enhances the use effect of the vacuum system composed of multiple water ring vacuum pumps 1 in the power plant.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A power plant vacuum system strengthening device, comprising a water ring vacuum pump (1), characterized in that: The inlet of the water ring vacuum pump (1) is connected to the mixing cooler (3) through a suction pipe (2), and the mixing cooler (3) is connected to the condenser through a gas collecting pipe (4); A cooling water spray assembly (5) is provided on the top of the mixing cooler (3), and the cooling water spray assembly (5) is connected to the cooling water supply pipeline of the power plant. The cooling water spray assembly (5) can spray cooling water evenly into the mixing cooler (3); The bottom of the mixing cooler (3) is connected to the drain pipeline of the power plant through a drain pipe (6).
2. The power plant vacuum system strengthening device according to claim 1, characterized in that: The cooling water spray assembly (5) comprises a spray pipe (51), one end of which is connected to the cooling water supply pipeline of the power plant, and the other end of which is connected to a plurality of spray branch pipes (53) via a water distributor (52), and the water outlet ends of the plurality of spray branch pipes (53) extend from the top plate of the mixing cooler (3) to the interior thereof.
3. The power plant vacuum system strengthening device according to claim 2, characterized in that: The water outlet end of the spray branch pipe (53) is provided with a spray head (7).
4. The power plant vacuum system strengthening device according to claim 2, characterized in that: The spray branch pipe (53) is provided with a solenoid valve (8) on the pipe body located outside the mixing cooler (3).
5. The power plant vacuum system strengthening device according to any one of claims 1 to 4, characterized in that: The mixing cooler (3) is cylindrical in shape, and the ratio of its height to its diameter is not less than 2:
1.
6. The power plant vacuum system strengthening device according to any one of claims 1 to 4, characterized in that: The connection point between the suction pipe (2) and the mixing cooler (3) is close to the lower end of the mixing cooler (3).
7. The power plant vacuum system strengthening device according to claim 4, characterized in that: Temperature sensors are provided inside and outside the mixing cooler (3).