A unit condensate cooling system

Abstract

The utility model discloses a kind of unit condensate cooling systems, belong to steam turbine technical field, including the heat exchange device installed in the front end of fine treatment device;The heat exchange device is drain cooler;The drain cooler includes cooling machine shell, and the cooling machine shell is provided with heat network water inlet and heat network water outlet, and the inside of the cooling machine shell is fixedly installed with several groups of heat exchange pipes;The both ends of the cooling machine shell are fixedly installed with first pipe box and second pipe box respectively.The unit condensate cooling system of the utility model is by installing a heat exchange device in front of fine treatment device, using part of heat network city backwater and condensate water heat exchange, reduce condensate water temperature, ensure the safety of unit fine treatment device operation and enhance the cooling effect of boiler cooling slag device, improve the ability of discharging slag, back pressure adjustment can approach design value, make full use of steam heating;At the same time, heat exchange device is convenient to maintain regularly, ensure stable heat exchange efficiency, to guarantee condensate water temperature standard.

Description

Technical Field

[0001] This utility model belongs to the field of steam turbine technology, specifically relating to a condensate cooling system for a generator unit. Background Technology

[0002] In subcritical single-stage intermediate reheat circulating fluidized bed heating units, high back pressure heating is currently used during the heating season. According to the design, the unit can basically utilize exhaust steam for heating during the early and late cold periods.

[0003] 1. As the back pressure of the unit increases, the condensate temperature reaches a maximum of 70℃, which is the protection operating temperature (69℃) of the unit's fine treatment device, resulting in a safety risk to the operation of the fine treatment device. Long-term operation under this condition may reduce the life of the resin inside the fine treatment device, posing a hidden danger to the safe operation of the unit.

[0004] 2. The boiler slag cooler uses condensate for cooling. The excessively high inlet water temperature of the slag cooler also leads to a high slag discharge temperature, resulting in increased heat loss during slag discharge and wasted heat.

[0005] 3. Due to the influence of the fine treatment inlet water temperature, the unit's back pressure is limited to 28 kPa, failing to reach the design value and resulting in exhaust heat loss. (e.g.) Figure 5 (As shown).

[0006] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a unit condensate cooling system.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0008] The purpose of this utility model is to provide a unit condensate cooling system that can solve the above-mentioned technical problems.

[0009] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows: A condensate cooling system for a power unit includes a heat exchange device installed at the front end of the fine treatment unit. The heat exchange device is a hydrophobic cooler; The hydrophobic cooler includes a cooling housing, on which a heat exchanger inlet and a heat exchanger outlet are provided, and several sets of heat exchange tubes are fixedly installed inside the cooling housing. The cooling housing is fixedly installed with a first tube box and a second tube box at both ends. The two ends of several sets of heat exchange tubes are connected to the inside of the first tube box and the second tube box respectively. The first tube box is provided with a condensate inlet and the second tube box is provided with a condensate outlet. The first pipe box is equipped with a filter assembly.

[0010] In one or more embodiments of the present invention, the filter assembly includes a filter screen, which is fixedly installed inside the first pipe box, and the filter screen is a 300-400 mesh filter screen.

[0011] In one or more embodiments of this utility model, a backwash inlet is fixedly installed on the second pipe box, and a waste outlet is fixedly installed on the first pipe box.

[0012] In one or more embodiments of this utility model, control valves are fixedly installed on the condensate inlet, waste outlet, condensate outlet, and backflushing inlet.

[0013] In one or more embodiments of this utility model, the control valve is any one of a gate valve, a butterfly valve, or a ball valve.

[0014] In one or more embodiments of this utility model, multiple sets of baffles are fixedly installed on several sets of heat exchange tubes, and the several sets of heat exchange tubes are fixedly supported by multiple sets of baffles.

[0015] In one or more embodiments of this utility model, adjacent baffles are respectively fixed above and below inside the cooling housing.

[0016] In one or more embodiments of this utility model, the baffle plate is any one of aluminum plate, aluminum alloy plate or copper plate.

[0017] Compared with existing technologies, the condensate cooling system of this utility model reduces the condensate temperature by adding a heat exchange device before the fine treatment unit and using part of the urban return water from the heating network to exchange heat with the condensate. This ensures the safety of the unit's fine treatment unit operation, enhances the cooling effect of the boiler slag cooler, improves slag discharge capacity, and allows the back pressure adjustment to approach the design value, making full use of exhaust steam for heating. At the same time, the heat exchange device is easy to maintain regularly, ensuring stable heat exchange efficiency to guarantee that the condensate temperature meets the standard. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a partial process system diagram of a unit condensate cooling system in one embodiment of the present invention; Figure 2 This is a structural diagram of a hydrophobic cooler in a unit condensate cooling system according to one embodiment of the present invention; Figure 3 This is a cross-sectional view of a hydrophobic cooler in a unit condensate cooling system according to an embodiment of the present invention. Figure 4 This is an enlarged cross-sectional view of the first pipe box of a unit condensate cooling system according to an embodiment of the present invention; Figure 5 This is a partial process system diagram of an existing unit.

[0020] Explanation of key figure labels: 10. Cooling casing; 11. Heating network inlet; 12. Heating network outlet; 20. First pipe box; 21. Condensate inlet; 22. Waste outlet; 30. Second pipe box; 31. Condensate outlet; 32. Backflush inlet. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0022] like Figures 1-4 As shown, an embodiment of the present invention provides a condensate cooling system for a power unit, including a heat exchange device installed at the front end of the fine treatment unit. The heat exchange device is a condensate cooler. The condensate cooler allows the turbine condensate to exchange heat with a portion of the city return water from the heating network, thereby reducing the temperature of the condensate before it enters the fine treatment unit. The remaining city return water from the heating network enters the high back pressure condenser. After heat exchange, the water source mixes with the high back pressure condenser return water and then enters the primary heating network system.

[0023] After installing the condensate cooler, the condensate temperature decreases by approximately 10℃ under the same operating conditions (the condensate temperature reaches below 65℃). With the lower condensate temperature, the fine treatment unit operates in a highly efficient, safe, and reliable range, increasing the service life of the fine treatment resin and improving the unit's operational reliability. The boiler slag cooler return water temperature is expected to rise from around 25℃ to around 30℃, improving the slag cooler's heat exchange efficiency and enhancing the utilization of waste heat from the boiler slag temperature.

[0024] Meanwhile, the unit's back pressure can be increased to approximately 30-32 kPa, corresponding to a saturation temperature of around 71°C, thus improving the unit's exhaust steam utilization rate. During the heating season, the average condensate temperature was previously 67°C. After adding a condensate drain cooler, the condensate temperature was reduced to 60°C. Based on a boiler efficiency of 85%, it is estimated that approximately 900 tons of standard coal will be consumed throughout the heating season. At a standard coal price of 650 yuan / ton, this translates to savings of 585,000 yuan, demonstrating significant energy-saving effects.

[0025] Adjusting the cooling water flow rate of the heat exchanger according to the winter heating situation can increase the output of the high back pressure condenser and improve the utilization rate of the unit's exhaust steam.

[0026] The water-cooled condenser includes a cooling housing 10, which is provided with a heating network inlet 11 and a heating network outlet 12. The urban return water from the heating network enters the interior of the cooling housing 10 through the heating network inlet 11 and can be discharged through the heating network outlet 12.

[0027] Several sets of heat exchange tubes 60 are fixedly installed inside the cooling housing 10. The urban return water of the heating network exchanges heat with the condensate through the several sets of heat exchange tubes 60 to reduce the temperature of the condensate.

[0028] The cooling housing 10 has a first tube box 20 and a second tube box 30 fixedly installed at both ends. Several sets of heat exchange tubes 60 are connected to the inside of the first tube box 20 and the second tube box 30 at both ends. The first tube box 20 is provided with a condensate inlet 21 and the second tube box 30 is provided with a condensate outlet 31. Condensate can enter the inside of the first tube box 20 through the condensate inlet 21, then disperse into the inside of several sets of heat exchange tubes 60, and finally collect again inside the second tube box 30 and be discharged through the condensate outlet 31.

[0029] Specifically, the turbine condensate enters the first tube box 20 through the condensate inlet 21 and then disperses into several sets of heat exchange tubes 60. At the same time, the urban return water from the heating network enters the cooling casing 10 through the heating network inlet 11. After heat exchange between the urban return water and the condensate through the heat exchange tubes 60, the temperature of the urban return water increases while the temperature of the condensate decreases. Finally, the urban return water is discharged through the heating network outlet 12, while the condensate is discharged through the condensate outlet 31.

[0030] Furthermore, multiple sets of baffles 70 are fixedly installed on several sets of heat exchange tubes 60, and the multiple sets of baffles 70 provide fixed support for the heat exchange tubes 60 to enhance the structural strength between them. Adjacent baffles 70 are fixed above and below the interior of the cooling housing 10, respectively. The multiple sets of baffles 70 allow the urban return water from the heating network to flow through the interior of the cooling housing 10 in a baffled state, thereby ensuring sufficient heat exchange.

[0031] Furthermore, the baffle plate 70 is made of any one of aluminum plate, aluminum alloy plate or copper plate, which has good thermal conductivity and can be used as a heat-conducting fin to improve the heat exchange efficiency between urban return water and condensate in the heating network.

[0032] The first tube box 20 is equipped with a filter assembly, which includes a filter screen 50. The filter screen 50 is fixedly installed inside the first tube box 20. The filter screen 50 is a 300-400 mesh filter screen, which can filter and remove impurities from the condensate, ensuring the cleanliness of the condensate entering the heat exchange tube 60 and preventing impurities in the condensate from accumulating and adhering on the inner wall of the heat exchange tube 60, so as to ensure the heat exchange efficiency of the heat exchange tube 60 under long-term operation.

[0033] Furthermore, a backwash inlet 32 ​​is fixedly installed on the second pipe box 30, and a waste outlet 22 is fixedly installed on the first pipe box 20. Butterfly valves are fixedly installed on the condensate inlet 21, waste outlet 22, condensate outlet 31, and backwash inlet 32. The backwash inlet 32 ​​can be connected to an external water source for backwashing and cleaning of the filter screen 50.

[0034] Specifically, when cleaning the filter screen 50 is required, the butterfly valves on the condensate inlet 21 and condensate outlet 31 can be closed, while the butterfly valves on the waste outlet 22 and backflushing inlet 32 ​​can be opened. External water is injected into the second tube box 30 through the backflushing inlet 32, and then transmitted to the first tube box 20 through several sets of heat exchange tubes 60, thereby backflushing and cleaning the filter screen 50. The wastewater generated during the backflushing and cleaning process is discharged through the waste outlet 22. By regularly backflushing the filter screen 50, it is ensured that the filter screen 50 will not become clogged, thus achieving efficient filtration of condensate and helping to ensure the long-term stable heat exchange of the condensate cooler.

[0035] Compared with existing technologies, the condensate cooling system of this utility model reduces the condensate temperature by adding a heat exchange device before the fine treatment unit and using part of the urban return water from the heating network to exchange heat with the condensate. This ensures the safety of the unit's fine treatment unit operation, enhances the cooling effect of the boiler slag cooler, improves slag discharge capacity, and allows the back pressure adjustment to approach the design value, making full use of exhaust steam for heating. At the same time, the heat exchange device is easy to maintain regularly, ensuring stable heat exchange efficiency to guarantee that the condensate temperature meets the standard.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A condensate cooling system for a generating unit, characterized in that, Including heat exchange devices installed at the front end of the fine treatment unit; The heat exchange device is a hydrophobic cooler; The hydrophobic cooler includes a cooling housing, on which a heat exchanger inlet and a heat exchanger outlet are provided, and several sets of heat exchange tubes are fixedly installed inside the cooling housing. The cooling housing is fixedly installed with a first tube box and a second tube box at both ends. The two ends of several sets of heat exchange tubes are connected to the inside of the first tube box and the second tube box respectively. The first tube box is provided with a condensate inlet and the second tube box is provided with a condensate outlet. The first pipe box is equipped with a filter assembly.

2. The condensate cooling system for a generating unit according to claim 1, characterized in that, The filtration assembly includes a filter screen, which is fixedly installed inside the first pipe box. The filter screen is a 300-400 mesh filter screen.

3. The condensate cooling system for a generating unit according to claim 1, characterized in that, The second pipe box is fixedly installed with a backwash inlet, and the first pipe box is fixedly installed with a waste outlet.

4. The condensate cooling system for a generating unit according to claim 3, characterized in that, Control valves are fixedly installed on the condensate inlet, waste outlet, condensate outlet, and backflushing inlet.

5. A unit condensate cooling system according to claim 4, characterized in that, The control valve is any one of a gate valve, butterfly valve, or ball valve.

6. The condensate cooling system for a generating unit according to claim 1, characterized in that, Several sets of baffles are fixedly installed on several sets of heat exchange tubes, and the several sets of heat exchange tubes are fixedly supported by the multiple sets of baffles.

7. A unit condensate cooling system according to claim 6, characterized in that, The adjacent baffles are fixed at the top and bottom of the cooling housing, respectively.

8. A unit condensate cooling system according to claim 6 or 7, characterized in that, The baffle plate is made of any one of aluminum plate, aluminum alloy plate or copper plate.

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