Primary heat supply network return water treatment device for power plant, power plant system and control method

Abstract

The invention relates to the technical field of power plant heat supply network heat supply, in particular to a primary heat supply network backwater treatment device for a power plant, a power plant system and a control method. A primary heat supply network return water treatment device for a power plant comprises a filter assembly comprising a filter pipeline and a filter, the water inlet end of the filter pipeline is suitable for being communicated with a primary heat supply network return water pipeline, the water outlet end of the filter pipeline is suitable for being communicated with the primary heat supply network return water pipeline, and primary heat supply network return water flows in the primary heat supply network return water pipeline; the water inlet end is arranged on the upstream of the water outlet end, and a filter is arranged on the filtering pipeline. The invention provides a primary heat supply network backwater treatment device for a power plant, a power plant system and a control method, and aims to solve the problems that a heat supply network is a closed pipeline, incrustation increase occurs during long-time operation, the incrustation increase can only be temporarily relieved by adding chemicals such as a scale inhibitor, and consequently the water quality of the primary heat supply network cannot meet the requirement; and corrosion and leakage of the pipe wall of the heat supply pipe network are caused after a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of heat supply in a power plant's heat network, and particularly to a primary heat network return water treatment device for a power plant, a power plant system, and a control method. Background Art

[0002] Centralized heating is the main way of winter heating. A centralized heating system is a heating system that includes a heat source, a primary network, a heat exchange station, a secondary network, and uses water as the heat transfer medium. With the rapid development of cities, the heating area is continuously increasing, and the heating pipe network system is becoming increasingly complex. The primary pipe network is often arranged under various urban roads to form a heating pipe network. The quality of the heat network water directly affects the safe and stable operation of the heating system.

[0003] After the heating pipe network has been operating for a long time, the scale will gradually increase, and the water quality of the primary network in the pipe network does not meet the requirements. When treated water is supplemented during operation, the water quality is temporarily optimized, or chemicals such as scale inhibitors are added to avoid the formation of scale or substances that corrode the pipe wall, affecting the stable operation of the heating system. However, since the heat network is a closed pipeline, only after the heat network water is lost can it be supplemented. The method of adding chemicals such as scale inhibitors can only relieve the situation temporarily. Although it can relieve the situation temporarily, it also brings other impacts and other pollutions, resulting in the inability of the primary heat network water quality to meet the requirements. After a long time, it will cause corrosion and leakage of the heating pipe network wall, affecting the safe and stable operation of the heating system. Summary of the Invention

[0004] In view of this, the present invention provides a primary heat network return water treatment device for a power plant, a power plant system, and a control method to solve the problem that the heat network is a closed pipeline, and during long-term operation, the scale increases. The method of adding chemicals such as scale inhibitors can only relieve the phenomenon of increasing scale temporarily, but brings other pollutions, resulting in the inability of the primary heat network water quality to meet the requirements, and causing corrosion and leakage of the heating pipe network wall after a long time.

[0005] In a first aspect, the present invention provides a primary heat network return water treatment device for a power plant, including:

[0006] A filtering assembly, the filtering assembly includes a filtering pipeline and a filter. The water inlet end of the filtering pipeline is adapted to be connected to the primary heat network return water pipeline, and the water outlet end of the filtering pipeline is adapted to be connected to the primary heat network return water pipeline. The primary heat network return water is adapted to flow in the primary heat network return water pipeline. The water inlet end is arranged upstream of the water outlet end, and a filter is provided on the filtering pipeline.

[0007] By setting up a filter, the primary heat network return water in the primary heat network return water pipeline is filtered through the filter, thereby reducing the pollution impurities in the primary heat network return water pipeline, reducing the water scale in the primary heat network return water, effectively improving the water quality of the primary heat network return water. Without adding hot water, it is filtered by the filter, and there is no need to add chemicals to cause other pollution, thus avoiding the corrosion and leakage of the heat supply pipeline wall and ensuring the safe and stable operation of the heat supply system.

[0008] In an alternative embodiment, the filtering assembly further includes a magnetic separator, and a magnetic separator is provided on the filtering pipeline, and the magnetic separator is located between the water inlet end and the filter.

[0009] In an alternative embodiment, the filtering assembly further includes a heat exchanger, and a heat exchanger is provided on the filtering pipeline, and the heat exchanger is located between the magnetic separator and the filter.

[0010] In an alternative embodiment, the filtering assembly further includes a first valve, and a first valve is provided on the filtering pipeline, and the first valve is located between the heat exchanger and the magnetic separator.

[0011] In an alternative embodiment, the filtering assembly further includes a second valve and a first power pump, and a second valve and a first power pump are provided on the filtering pipeline, and the second valve and the first power pump are arranged in sequence from the water inlet end towards the magnetic separator.

[0012] In an alternative embodiment, it further includes a first bypass assembly, and the first bypass assembly includes a first bypass pipeline and a third valve. The first bypass pipeline includes a first water inlet interface and a first water outlet interface. The connection point of the first water inlet interface and the filtering pipeline is located between the first power pump and the magnetic separator, and the connection point of the first water outlet interface and the filtering pipeline is located between the magnetic separator and the first valve. A third valve is provided on the first bypass pipeline.

[0013] In an alternative embodiment, it further includes a second bypass assembly, and the second bypass assembly includes a second bypass pipeline and a fourth valve. The second bypass pipeline includes a second water inlet interface and a second water outlet interface. The connection point of the second water inlet interface and the filtering pipeline is located between the first water outlet interface and the third valve, and the connection point of the second water outlet interface and the filtering pipeline is located between the heat exchanger and the filter. A fourth valve is provided on the second bypass pipeline.

[0014] In a second aspect, the present invention further provides a power plant system, including the above-mentioned primary heat network return water treatment device for power plants.

[0015] In an alternative embodiment, it further includes a primary heat network return water pipeline and a heat exchange assembly. The heat exchange assembly includes a heat exchange circulation pipeline and a second power pump, and a condenser and a heat exchanger are provided on the heat exchange circulation pipeline.

[0016] In a third aspect, the present invention further provides a control method for a primary heat network return water treatment device used in a power plant. The primary heat network return water in the primary heat network return water pipeline flows into the filtration pipeline through the water inlet end, and after being filtered in the filter, it flows into the primary heat network return water pipeline through the water outlet end. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of a primary heat network return water treatment device for a power plant according to an embodiment of the present invention.

[0019] Description of the reference numerals: 1. Primary heat network return water pipeline; 2. Filtration assembly; 201. Filter; 202. Iron remover; 203. Heat exchanger; 204. First valve; 205. Filtration pipeline; 206. First power pump; 207. Second valve; 208. Fifth valve; 3. First bypass assembly; 301. First bypass pipeline; 302. Third valve; 4. Second bypass assembly; 401. Second bypass pipeline; 402. Fourth valve; 5. Heat exchange assembly; 501. Heat exchange circulation pipeline; 502. Second power pump; 503. Condenser; 504. External pipeline; 5041. Cold water inlet end; 5042. Warm water outlet end; 505. Sixth valve; 506. Seventh valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0021] The following will describe the embodiments of the present invention in conjunction with Figure 1 , describing the embodiments of the present invention.

[0022] According to an embodiment of the present invention, on the one hand, a primary heat network return water treatment device for a power plant is provided, including: a filtering assembly 2, the filtering assembly 2 includes a filtering pipeline 205 and a filter 201. The water inlet end of the filtering pipeline 205 is adapted to be connected to the primary heat network return water pipeline 1, and the water outlet end of the filtering pipeline 205 is adapted to be connected to the primary heat network return water pipeline 1. The primary heat network return water is adapted to flow in the primary heat network return water pipeline 1. The water inlet end is arranged upstream of the water outlet end, and a filter 201 is provided on the filtering pipeline 205.

[0023] The primary heat network return water in the primary heat network return water pipeline 1 flows into the filtering pipeline 205 through the water inlet end, and after being filtered in the filter, it flows into the primary heat network return water pipeline 1 through the water outlet end.

[0024] By setting the filter 201, the primary heat network return water in the primary heat network return water pipeline 1 is filtered through the filter 201, thereby reducing the pollution impurities in the primary heat network return water pipeline 1, reducing the water scale in the primary heat network return water, effectively improving the water quality of the primary heat network return water. Without adding hot water, it is filtered by the filter 201, and there is no need to add chemicals to cause other pollution, thereby avoiding the corrosion and leakage of the heat supply pipeline wall and ensuring the safe and stable operation of the heat supply system. It should be noted that the upstream in this application refers to the reverse water flow direction. The water inlet end is arranged upstream of the water outlet end, which means that the primary heat network return water first flows through the water inlet end and then through the water outlet end. In this embodiment, the filter 201 is used to remove the water scale in the filtering pipeline 205. The filter 201 includes a pretreatment module, an ultrafiltration membrane module, and a reverse osmosis membrane module. According to the heat network return water index situation, the water treatment device is reasonably selected and configured, and this embodiment does not make specific limitations.

[0025] In one embodiment, as Figure 1 shown, the filtering assembly 2 further includes a de-ironing device 202. A de-ironing device 202 is provided on the filtering pipeline 205, and the de-ironing device 202 is located between the water inlet end and the filter 201. In this embodiment, the de-ironing device 202 is located upstream of the filter 201, that is, the primary heat network return water first flows through the de-ironing device 202 and then through the filter 201 to remove the iron ions or rust contained in the primary heat network return water through the de-ironing device 202, and then flows into the filter 201 to remove other impurities.

[0026] In one embodiment, as Figure 1 shown, the filtering assembly 2 further includes a heat exchanger 203. A heat exchanger 203 is provided on the filtering pipeline 205, and the heat exchanger 203 is located between the de-ironing device 202 and the filter 201. When the temperature of the primary heat network return water in the filtering pipeline 205 is too high, heat exchange is performed through the heat exchanger 203 to reduce the temperature of the primary heat network return water.

[0027] In one embodiment, as Figure 1As shown, the filtration assembly 2 further includes a first valve 204. The first valve 204 is provided on the filtration pipeline 205. The first valve 204 is located between the heat exchanger 203 and the iron remover 202, and controls the opening and closing of the filtration pipeline 205.

[0028] In one embodiment, as Figure 1 shown, the filtration assembly 2 further includes a second valve 207 and a first power pump 206. The second valve 207 and the first power pump 206 are provided on the filtration pipeline 205. The second valve 207 and the first power pump 206 are arranged in sequence from the water inlet end towards the iron remover 202. Specifically, the power pump is a booster pump. Through the cooperation of the first valve 204 and the second valve 207, the opening and closing of the filtration pipeline 205 are controlled. The power pump drives the primary heat network return water into the filtration pipeline 205. Due to the effect of the power pump, the water pressure of the primary heat network return water in the filtration pipeline 205 is slightly greater than that of the primary heat network return water in the primary heat network return pipeline 1, so as to facilitate the water flow in the filtration pipeline 205.

[0029] In one embodiment, as Figure 1 shown, it further includes a first bypass assembly 3. The first bypass assembly 3 includes a first bypass pipeline 301 and a third valve 302. The first bypass pipeline 301 includes a first water inlet interface and a first water outlet interface. The connection of the first water inlet interface with the filtration pipeline 205 is located between the first power pump 206 and the iron remover 202, and the connection of the first water outlet interface with the filtration pipeline 205 is located between the iron remover 202 and the first valve 204. The third valve 302 is provided on the first bypass pipeline 301. When the iron remover 202 needs to be replaced or damaged, in order to avoid the filtration efficiency, by setting the first bypass pipeline 301, the primary heat network return water passes through the first bypass pipeline 301 without passing through the iron remover 202, so as to ensure the continuous flow of the primary heat network return water in the filtration pipeline 205 during the maintenance or replacement of the iron remover 202.

[0030] In one embodiment, as Figure 1 shown, it further includes a second bypass assembly 4. The second bypass assembly 4 includes a second bypass pipeline 401 and a fourth valve 402. The second bypass pipeline 401 includes a second water inlet interface and a second water outlet interface. The connection of the second water inlet interface with the filtration pipeline 205 is located between the first water outlet interface and the third valve 302, and the connection of the second water outlet interface with the filtration pipeline 205 is located between the heat exchanger 203 and the filter 201. The fourth valve 402 is provided on the second bypass pipeline 401. When the heat exchanger 203 is not needed (the temperature of the primary heat network return water in the filtration pipeline 205 is lower than the preset temperature), by setting the second bypass pipeline 401, the primary heat network return water in the filtration pipeline 205 flows into the filter 201 without passing through the heat exchanger 203 but through the second bypass pipeline 401.

[0031] A power plant system includes the above-mentioned primary heat network return water treatment device for power plants, and also includes a heat exchange component 5. The heat exchange component 5 includes a heat exchange circulation pipeline 501 and a second power pump 502. A condenser 503 and a heat exchanger 203 are provided on the heat exchange circulation pipeline 501. Among them, the heat exchange circulation pipeline 501 is arranged to pass through the heat exchanger 203. As Figure 1 shown, in this embodiment, the heat exchange component 5 further includes an external pipeline 504, a sixth valve 505 and a seventh valve 506. Among them, the external pipeline 504 is communicated with the circulating heat exchange pipeline. Circulating cooling water enters the external pipeline 504, and a part of the circulating cooling water after heat exchange will flow out of the external pipeline 504, and another part of the circulating cooling water will continue to flow in the heat exchange circulation pipeline 501.

[0032] To achieve automatic control, it further includes a controller. The controller is respectively connected to the first power pump 206, the second power pump 502, the first valve 204, the second valve 207, the third valve 302, the fourth valve 402, the fifth valve 208, the sixth valve 505 and the seventh valve 506 by wires.

[0033] A control method for a primary heat network return water treatment device for power plants includes the following steps:

[0034] (1) When the water temperature in the primary heat network return water pipeline 1 is equal to or higher than 45 °C, heat exchange is required. Open the second valve 207, the first power pump 206, the first valve 204, the fifth valve 208, the second power pump 502, the sixth valve 505 and the seventh valve 506, and close the third valve 302 and the fourth valve 402. The primary heat network return water in the primary heat network return water pipeline 1 is boosted by the first power pump 206 and then passes through the iron remover 202, the heat exchanger 203 and the filter 201 in sequence, and then flows back into the primary heat network return water pipeline 1 to achieve the process of "boosting pressure, removing iron ions, and reducing temperature";

[0035] (2) When the water temperature in the primary heat network return water pipeline 1 is lower than 45 °C, heat exchange is not required. Close the second power pump 502, the sixth valve 505 and the seventh valve 506, so that the heat exchange component 5 stops working. At the same time, close the first valve 204 and open the fourth valve 402, so that the primary heat network return water does not pass through the heat exchanger 203 but flows through the second bypass pipeline 401;

[0036] (3) When the iron remover 202 needs to be overhauled, the iron remover 202 stops working. Open the third valve 302, so that the primary heat network return water flows into the second bypass pipeline 401 through the first bypass pipeline 301 or enters the heat exchange through the first valve 204.

[0037] It should be noted that the cold water inlet end 5041 of the external pipeline 504 will flow into the circulating cooling water. The circulating cooling water sequentially enters the heat exchanger 203 through the sixth valve 505 and the second power pump 502 and then exchanges heat with the primary heat network return water. After heat exchange, the circulating cooling water flows in the heat exchange circulating pipeline 501 and passes through the seventh valve 506. Part of it will flow out from the warm water outlet end 5042, and part of it will flow into the condenser 503 to continue circulating heat exchange with the newly entered circulating cooling water, so as to avoid damaging the heat exchanger 203 due to a large temperature difference from the primary heat network return water.

[0038] The primary heat network return water treatment device, power plant system and control method provided by the present invention have the following advantages: (1) By setting the filter 201, the primary heat network return water in the primary heat network return water pipeline 1 is filtered through the filter 201, thereby reducing the polluting impurities in the primary heat network return water pipeline 1 and reducing the scale in the primary heat network return water, effectively improving the water quality of the primary heat network return water. Without adding hot water, it is filtered by the filter 201, and there is no need to add chemicals to cause other pollution, thus avoiding the corrosion and leakage of the heat supply pipeline wall and ensuring the safe and stable operation of the heat supply system; (2) By setting the first power pump 206, the water pressure in the filter pipeline 205 is higher than the water pressure in the primary heat network return water pipeline 1, ensuring the filtering effect of the filter 201; (3) By setting the iron remover 202, the dual effects of "removing iron ions + removing scale" are achieved, further improving the water quality of the primary heat network return water; (4) By setting the first bypass pipeline 301, the filter pipeline 205 can still operate normally when the iron remover 202 is under maintenance; (5) By setting the heat exchange assembly 5, heat exchange is realized when the temperature of the primary heat network return water is too high, ensuring the reuse of heat.

[0039] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A primary heat network water treatment device for a power plant, characterized in that, Comprising: A filtering component (2), the filtering component (2) includes a filtering pipeline (205) and a filter (201), the water inlet end of the filtering pipeline (205) is adapted to communicate with the primary heat network return water pipeline (1), the water outlet end of the filtering pipeline (205) is adapted to communicate with the primary heat network return water pipeline (1), the primary heat network return water is adapted to flow in the primary heat network return water pipeline (1), the water inlet end is arranged upstream of the water outlet end, and a filter (201) is provided on the filtering pipeline (205).

2. The primary heat network water treatment device for a power plant according to claim 1, wherein The filtering component (2) further includes a magnetic separator (202), a magnetic separator (202) is provided on the filtering pipeline (205), and the magnetic separator (202) is located between the water inlet end and the filter (201).

3. The primary heat network water treatment device for power plants according to claim 2, wherein, The filtering component (2) further includes a heat exchanger (203), a heat exchanger (203) is provided on the filtering pipeline (205), and the heat exchanger (203) is located between the magnetic separator (202) and the filter (201).

4. The primary heat network water treatment device for power plants according to claim 3, wherein The filtering component (2) further includes a first valve (204), a first valve (204) is provided on the filtering pipeline (205), and the first valve (204) is located between the heat exchanger (203) and the magnetic separator (202).

5. The primary heat network water treatment device for a power plant according to claim 4, characterized in that, The filtering component (2) further includes a second valve (207) and a first power pump (206), a second valve (207) and a first power pump (206) are provided on the filtering pipeline (205), and the second valve (207) and the first power pump (206) are sequentially arranged from the water inlet end towards the magnetic separator (202).

6. The primary heat network water treatment device for power plants according to claim 5, characterized in that, It further includes a first bypass component (3), the first bypass component (3) includes a first bypass pipeline (301) and a third valve (302), the first bypass pipeline (301) includes a first water inlet interface and a first water outlet interface, the connection between the first water inlet interface and the filtering pipeline (205) is located between the first power pump (206) and the magnetic separator (202), the connection between the first water outlet interface and the filtering pipeline (205) is located between the magnetic separator (202) and the first valve (204), and a third valve (302) is provided on the first bypass pipeline (301).

7. The primary heat network water treatment device for a power plant according to claim 6, characterized in that, It further includes a second bypass component (4), the second bypass component (4) includes a second bypass pipeline (401) and a fourth valve (402), the second bypass pipeline (401) includes a second water inlet interface and a second water outlet interface, the connection between the second water inlet interface and the filtering pipeline (205) is located between the first water outlet interface and the third valve (302), the connection between the second water outlet interface and the filtering pipeline (205) is located between the heat exchanger (203) and the filter (201), and a fourth valve (402) is provided on the second bypass pipeline (401).

8. A power plant system, characterized in that, Comprising the primary heat network return water treatment device for power plants according to any one of claims 1 - 7.

9. The power plant system according to claim 8, characterized in that, It also includes a primary heat network return water pipeline (1) and a heat exchange component (5). The heat exchange component (5) includes a heat exchange circulation pipeline (501) and a second power pump (502). A condenser (503) and a heat exchanger (203) are provided on the heat exchange circulation pipeline (501).

10. A control method for a primary heat network return water treatment device used in a power plant, which is used for the primary heat network return water treatment device described in claim 1, characterized in that, The primary heat network return water in the primary heat network return water pipeline (1) flows into the filter pipeline (205) through the water inlet end, and after being filtered in the filter, it flows into the primary heat network return water pipeline (1) through the water outlet end.

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