Pollution discharge and temperature reduction pool for thermal power plant
By adopting a multi-layer insulation structure and multi-stage cooling treatment in the wastewater desuperheating tank of thermal power plants, the problem of concrete cracking under high temperature environment was solved, and convenient construction and effective temperature control were achieved, ensuring the normal operation of the wastewater desuperheating tank.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-04-14
AI Technical Summary
Existing thermal power plant wastewater desuperheating tanks are prone to thermal stress in high-temperature environments, leading to concrete cracks. Furthermore, the proportion of refractory concrete materials is difficult to control, affecting their functionality.
The structure adopts a reinforced concrete outer layer, a light aggregate concrete middle layer, and a sintered brick inner layer. Combined with the heat insulation material of the cover plate, it forms a multi-layer heat insulation effect, reduces the steam temperature to within the range of reinforced concrete, and treats sewage and steam through multi-stage cooling.
It effectively avoids temperature cracks and holes in the outer layer of reinforced concrete, ensuring the normal function of the sewage desuperheating tank. At the same time, it is easy to construct and achieves multi-stage desuperheating effect.
Smart Images
Figure CN224119696U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewage cooling technology, and in particular to a sewage cooling tank for thermal power plants. Background Technology
[0002] The blowdown cooling tanks in thermal power plants serve multiple functions, including collecting wastewater, collecting high-temperature steam, and cooling it. Under normal circumstances, cooling water and steam traps are used to treat the high-temperature steam. However, in emergency situations such as steam trap malfunctions, the high-temperature steam entering the blowdown cooling tank can reach 200–350°C. The maximum service temperature of the reinforced concrete used in existing blowdown cooling tanks is only 200°C. The large temperature difference between the inner and outer walls of the reinforced concrete generates significant thermal stress, causing cracks in the concrete. At this point, the reinforced concrete will form numerous voids, reducing its strength and modulus of elasticity, rendering the blowdown cooling tank unusable. Currently, there are few designs for reinforced concrete blowdown cooling tanks operating in high-temperature environments. Existing technologies use refractory concrete in high-temperature environments, but the material ratio of refractory concrete is difficult to control during on-site construction, affecting its refractory performance. Utility Model Content
[0003] The purpose of this invention is to provide a wastewater desuperheating tank for thermal power plants, which collects wastewater and steam and reduces their temperature to within the service temperature range of concrete, and is easy to construct.
[0004] A wastewater desuperheating tank for thermal power plants includes: a tank body and a cover plate that covers the tank body;
[0005] The pool body has a cavity for collecting sewage and steam. The cavity has a vertical first partition wall. There is a gap between the top of the first partition wall and the cover plate. The first partition wall divides the cavity into a water storage cavity and a drainage cavity. One side of the pool body has a water inlet that connects the water storage cavity to the outside. The cover plate has an air inlet that connects the water storage cavity to the outside. The other side of the pool body has a water outlet that connects the drainage cavity to the outside.
[0006] The pool body comprises a reinforced concrete outer layer, a ceramsite concrete middle layer, and a sintered brick inner layer stacked sequentially from the outside to the inside. The bottom and both sides of the first partition wall are fixedly connected to the inner wall of the sintered brick inner layer.
[0007] Preferably, the water storage cavity is provided with a vertical second partition wall, the top of the second partition wall is spaced from the cover plate, the bottom and both sides of the second partition wall are fixedly connected to the inner wall of the inner layer of the sintered brick, the second partition wall is spaced apart from the first partition wall, the water outlet is located on the side of the pool body away from the water storage cavity, and the first partition wall is provided with an opening connecting the water storage cavity and the drainage cavity, the opening is spaced apart from the inner layer of the sintered brick.
[0008] Preferably, the first partition wall includes a first wall, a support plate, and a second wall that are fixedly connected from bottom to top, and the opening is provided on the first wall and at the bottom end of the support plate.
[0009] Preferably, the cover plate includes a steel plate shell, a rock wool board, and a concrete board, with the rock wool board and the concrete board installed on the steel plate shell from bottom to top.
[0010] Preferably, the steel plate outer shell includes a base plate, a hollow sleeve, and a folded edge. The base plate covers one end of the hollow sleeve, and the other end of the hollow sleeve is provided with the folded edge. The rock wool board is fixedly connected to the top of the base plate. The hollow sleeve is fitted around the outer periphery of the rock wool board and the concrete slab, and the folded edge is fixedly connected to the top of the concrete slab.
[0011] Preferably, the thickness of the steel plate outer shell is 15-25mm, and the thickness of the rock wool board is at least 40mm.
[0012] Preferably, the top of the inner layer of the sintered brick is provided with an installation groove, and the cover plate is installed in the installation groove to cover the pool body.
[0013] Preferably, the cover plate is detachably connected to the pool body.
[0014] Preferably, the cover plate is provided with lifting holes.
[0015] Preferably, the thickness of the intermediate layer of the ceramsite concrete is 150-200 mm, and the thickness of the inner layer of the sintered brick is at least 240 mm.
[0016] In summary, the beneficial technical effects of this utility model are as follows:
[0017] The intermediate layer of expanded clay concrete and the inner layer of sintered bricks in the pool body are both made of high-temperature resistant materials, which effectively achieves the purpose of heat insulation for steam. After the steam enters the pool body, the temperature is reduced to within the service temperature range of the reinforced concrete material when it is conducted to the outer layer of the pool body. This avoids defects such as temperature cracks and holes in the outer layer of reinforced concrete, ensuring its normal function. Moreover, the materials used in the pool body are all materials that are easy to purchase and use in the project, and the construction is easy to operate. The steam entering the pool body is first cooled into liquid before being discharged through the outlet. The sewage entering the pool body is first stored in the water storage chamber. When the liquid in the water storage chamber is higher than the first partition wall, it flows into the drainage chamber and is discharged from the outlet. This is beneficial for storing some sewage and facilitates the multi-stage cooling effect of sewage. Attached Figure Description
[0018] Figure 1 This is a schematic cross-sectional view of the front of the wastewater desuperheating tank for thermal power plants in this application;
[0019] Figure 2 This is a schematic cross-sectional view of the side of the wastewater desuperheating tank for thermal power plants in this application;
[0020] Figure 3 This is a top view of the cover plate of this application;
[0021] Figure 4 This is a cross-sectional schematic diagram of the cover plate of this application.
[0022] In the picture:
[0023] 1. Pool body; 11. Cavity; 111. First partition wall; 1111. Opening; 1112. First wall; 1113. Support plate; 1114. Second wall; 112. Water storage cavity; 1121. Second partition wall; 113. Drainage cavity; 12. Reinforced concrete outer layer; 13. Lightweight aggregate concrete intermediate layer; 14. Sintered brick inner layer; 141. Installation groove; 2. Cover plate; 21. Steel plate outer shell; 211. Base plate; 212. Hollow shell; 213. Folded edge; 22. Rock wool board; 23. Concrete slab; 24. Lifting hole. Detailed Implementation
[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0025] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.
[0027] Combination Figure 1-4 As shown, a wastewater desuperheating tank for thermal power plants includes: a tank body 1 and a cover plate 2 covering the tank body 1; the tank body 1 has a cavity 11 for collecting wastewater and steam, and a vertical first partition wall 111 is provided inside the cavity 11. The top of the first partition wall 111 is separated from the cover plate 2, and the first partition wall 111 divides the cavity 11 into a water storage cavity 112 and a drainage cavity 113. One side of the tank body 1 has a water inlet connecting the water storage cavity 112 to the outside, and the cover plate 2 has an air inlet connecting the water storage cavity 112 to the outside. The other side of the tank body 1 has a water outlet connecting the drainage cavity 113 to the outside; the tank body 1 includes a reinforced concrete outer layer 12, a ceramsite concrete intermediate layer 13, and a sintered brick inner layer 14 stacked sequentially from the outside to the inside. The bottom and both sides of the first partition wall 111 are fixedly connected to the inner wall of the sintered brick inner layer 14.
[0028] In this embodiment, when constructing the wastewater desuperheating tank for thermal power plants, the reinforced concrete outer layer 12 is first poured and cured. Then, a waterproof coating is applied to the inner wall of the reinforced concrete outer layer 12. Next, the ceramsite concrete intermediate layer 13 is poured, followed by the mortar masonry of the sintered clay brick inner layer 14. When the sintered brick inner layer 14 is constructed, an installation groove 141 for placing the cover plate 2 is reserved. Then, the first partition wall 111 is constructed. The material of the first partition wall 111 is the same as that of the sintered brick inner layer 14. In this embodiment, the first partition wall 111 does not have an opening 1111. Finally, the cover plate 2 is made and the tank body 1 is sealed. The construction is easy to operate. For example, the inlet is located on the left side of the pool body 1, and the outlet is located on the right side of the pool body 1. When using the wastewater desuperheating pool for thermal power plants, the pool body 1 is covered with a cover plate 2, and the drain valve and corresponding valves are opened. At the same time, the wastewater enters the pool body 1, and the desuperheating water is also added to the water storage chamber 112. The steam also enters the water storage chamber 112. After the high-temperature wastewater and steam are treated by the high-temperature resistant materials of the inner layer 14 of sintered brick and the intermediate layer 13 of ceramsite concrete in the pool body 1, the temperature is greatly reduced when they reach the outer layer 12 of reinforced concrete, which ensures the service life of the outer layer 12 of reinforced concrete. Moreover, under the action of the desuperheating water, the steam is liquefied. Only when the liquid level in the water storage chamber 112 is higher than the first partition wall 111, the liquid flows into the drainage chamber 113, which ensures the treatment time of the desuperheating water for steam and wastewater. This is conducive to ensuring that the liquid in the chamber 11 is treated to the discharge temperature before being discharged through the outlet.
[0029] Furthermore, a vertical second partition wall 1121 is provided inside the water storage cavity 112. The top of the second partition wall 1121 is spaced from the cover plate 2. The bottom and both sides of the second partition wall 1121 are fixedly connected to the inner wall of the inner layer 14 of the sintered brick. The second partition wall 1121 is spaced apart from the first partition wall 111. The water outlet is located on the side of the pool body 1 away from the water storage cavity 112. The first partition wall 111 is provided with an opening 1111 that connects the water storage cavity 112 and the drainage cavity 113. The opening 1111 is spaced apart from the inner layer 14 of the sintered brick.
[0030] In this embodiment, the inlet is located on the left side of the pool body 1, and the outlet is located on the right side of the pool body 1. The second partition wall 1121 and the first partition wall 111 are spaced apart from left to right. The liquid on the left side of the second partition wall 1121 in the water storage chamber 112 flows between the second partition wall 1121 and the first partition wall 111 after it exceeds the top of the second partition wall 1121. When the liquid height here reaches the height of the opening 1111, it can flow into the drainage chamber 113 through the opening 1111 and finally be discharged through the outlet, which can realize multi-stage cooling of sewage. Moreover, when the sewage stays in the water storage chamber 112, it is conducive to the settling of sediment in the sewage and avoids clogging of the outlet.
[0031] Furthermore, the first partition wall 111 includes a first wall 1112, a support plate 1113, and a second wall 1114 that are fixedly connected from bottom to top, and the opening 1111 is provided on the first wall 1112 and at the bottom end of the support plate 1113.
[0032] In this embodiment, when constructing the wastewater desuperheating tank for thermal power plants, the second partition wall 1121 is directly built; for the first partition wall 111, the first wall 1112 needs to be built first, and then a support plate 1113, preferably a steel plate, is placed at the top of the opening 1111. Then, the second wall 1114 on top of the support plate 1113 is built, thus avoiding the negative impact of the opening 1111 on the load-bearing capacity of the first partition wall 111.
[0033] Furthermore, the cover plate 2 includes a steel plate outer shell 21, a rock wool board 22, and a concrete board 23. The rock wool board 22 and the concrete board 23 are installed on the steel plate outer shell 21 from bottom to top. In this embodiment, the cover plate 2 also has a heat insulation effect. The cover plate 2 seals the pool body 1, and the steam in the cavity 11 is in direct contact with the bottom end of the cover plate 2. The temperature of the steam is transferred sequentially through the steel plate, the rock wool board 22, and the concrete board 23. The cover plate 2 provides good heat insulation for the steam.
[0034] Furthermore, the steel plate outer shell 21 includes a base plate 211, a hollow sleeve 212, and a folded edge 213. The base plate 211 covers one end of the hollow sleeve 212, and the other end of the hollow sleeve 212 is provided with the folded edge 213. The rock wool board 22 is fixedly connected to the top of the base plate 211. The hollow sleeve 212 is fitted around the outer periphery of the rock wool board 22 and the concrete slab 23. The folded edge 213 is fixedly connected to the top of the concrete slab 23.
[0035] In this embodiment, when constructing the cover plate 2, the steel plate shell 21 is processed and shaped. First, the rock wool board 22 is placed, and then the steel plate shell 21 is used as a template for the concrete slab 23. The concrete slab 23 is constructed, and some structural steel bars are set in the concrete slab 23 and welded to the steel plate shell 21 to strengthen the integrity of the cover plate 2. Finally, the steel plate shell 21 is folded at the four corners and welded to form a whole.
[0036] Furthermore, the thickness of the steel plate outer shell 21 is 15-25mm, and the thickness of the rock wool board 22 is at least 40mm. Preferably, the steel plate outer shell 21 is directly formed from a 20mm thick steel plate, and a 50mm thick rock wool board 22 is placed at the bottom inside the steel plate outer shell 21 to avoid the cover plate 2 being too thin to effectively insulate against high-temperature steam.
[0037] Furthermore, the top of the sintered brick inner layer 14 is provided with an installation groove 141, and the cover plate 2 is installed in the installation groove 141 to cover the pool body 1. In this embodiment, when using the wastewater desuperheating pool for thermal power plants, the heat-insulating cover plate 2 is placed in the installation groove 141 of the sintered brick inner layer 14. The cover plate 2 does not directly contact the reinforced concrete outer layer 12. The high-temperature steam in the cavity 11 passes through the cover plate 2, the sintered brick inner layer 14, and the ceramsite concrete intermediate layer 13 before transferring the cooled temperature to the reinforced concrete outer layer 12, ensuring that the temperature is at the normal service temperature of the reinforced concrete and effectively avoiding defects such as cracks and holes in the reinforced concrete outer layer 12.
[0038] Furthermore, the cover plate 2 is detachably connected to the pool body 1. In this embodiment, when sewage and steam need to be discharged or cooled, the cover plate 2 needs to be placed over the pool body 1 before use; when the cover plate 2 is removed, the deposited dirt in the cavity 11 can be cleaned, and the corresponding maintenance work can be completed.
[0039] Furthermore, the cover plate 2 is provided with lifting holes 24. The top of the cover plate 2 has four lifting holes 24. For example, the lifting holes 24 are elongated elliptical holes. When installing or removing the cover plate 2, tools are used to lift the cover plate 2 through the lifting holes 24 to complete the detachable connection between the cover plate 2 and the pool body 1. It should be noted that the lifting holes 24 are only used for lifting the cover plate 2; their size is insufficient to allow them to be used as steam inlets or outlets.
[0040] To ensure that the outer reinforced concrete layer 12 does not develop defects due to high-temperature steam, the thickness of the intermediate ceramsite concrete layer 13 and the inner sintered brick layer 14 cannot be too small. Furthermore, the thickness of the intermediate ceramsite concrete layer 13 is 150-200 mm, and the thickness of the inner sintered brick layer 14 is at least 240 mm.
[0041] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to implement the application, including making and using any device or system, employing suitable materials, and using any combination of methods. The scope of this application is defined by the claimed technical solution and includes other instances that would occur to those skilled in the art. Such other instances shall be considered to fall within the scope of protection defined by the claimed technical solution, provided that they include structural elements that are not different from the literal language of the claimed technical solution, or contain equivalent structural elements that are not substantially different from the literal language of the claimed technical solution.
Claims
1. A wastewater desuperheating tank for thermal power plants, characterized in that, include: The pool body and the cover plate that encloses the pool body; The pool body has a cavity for collecting sewage and steam. The cavity has a vertical first partition wall. There is a gap between the top of the first partition wall and the cover plate. The first partition wall divides the cavity into a water storage cavity and a drainage cavity. One side of the pool body has a water inlet that connects the water storage cavity to the outside. The cover plate has an air inlet that connects the water storage cavity to the outside. The other side of the pool body has a water outlet that connects the drainage cavity to the outside. The pool body comprises a reinforced concrete outer layer, a ceramsite concrete middle layer, and a sintered brick inner layer stacked sequentially from the outside to the inside. The bottom and both sides of the first partition wall are fixedly connected to the inner wall of the sintered brick inner layer.
2. The wastewater desuperheating tank for thermal power plants as described in claim 1, characterized in that, The water storage cavity is provided with a vertical second partition wall. The top of the second partition wall is spaced from the cover plate. The bottom and both sides of the second partition wall are fixedly connected to the inner wall of the inner layer of the sintered brick. The second partition wall is spaced apart from the first partition wall. The water outlet is located on the side of the pool body away from the water storage cavity. The first partition wall is provided with an opening that connects the water storage cavity and the drainage cavity. The opening is spaced apart from the inner layer of the sintered brick.
3. The wastewater desuperheating tank for thermal power plants as described in claim 2, characterized in that, The first partition wall includes a first wall body, a support plate, and a second wall body that are fixedly connected from bottom to top, and the opening is provided on the first wall body at the bottom end of the support plate.
4. The wastewater desuperheating tank for thermal power plants as described in claim 1, characterized in that, The cover plate includes a steel plate shell, a rock wool board, and a concrete board, with the rock wool board and the concrete board installed on the steel plate shell from bottom to top.
5. The wastewater desuperheating tank for thermal power plants as described in claim 4, characterized in that, The steel plate outer shell includes a base plate, a hollow sleeve, and a folded edge. The base plate covers one end of the hollow sleeve, and the other end of the hollow sleeve is provided with the folded edge. The rock wool board is fixedly connected to the top of the base plate. The hollow sleeve is fitted around the outer periphery of the rock wool board and the concrete slab, and the folded edge is fixedly connected to the top of the concrete slab.
6. The wastewater desuperheating tank for thermal power plants as described in claim 4, characterized in that, The thickness of the steel plate outer shell is 15-25mm, and the thickness of the rock wool board is at least 40mm.
7. The wastewater desuperheating tank for thermal power plants as described in claim 1, characterized in that, The top of the inner layer of the sintered brick is provided with an installation groove, and the cover plate is installed in the installation groove to cover the pool body.
8. The wastewater desuperheating tank for thermal power plants as described in claim 1, characterized in that, The cover plate is detachably connected to the pool body.
9. The wastewater desuperheating tank for thermal power plants as described in claim 8, characterized in that, The cover plate is provided with lifting holes.
10. The wastewater desuperheating tank for thermal power plants as described in claim 1, characterized in that, The thickness of the intermediate layer of the ceramsite concrete is 150-200 mm, and the thickness of the inner layer of the sintered brick is at least 240 mm.