CN115585446A - A Stable Boiler Feed Water System with Reduced Pressure Loss - Google Patents

Abstract

The invention discloses a stable boiler water supply system with reduced pressure loss, which includes a soft water tank, a heat exchanger, three sets of boilers, a filter, a settling tank, a first filter box and a second filter box. The water outlet is connected with a first pipeline, and one end of the first pipeline is provided with two sets of first water pumps in parallel, and one end of the first water pump is connected with an opening and closing valve, and the two sets of opening and closing valves are connected to the heat exchanger. The boilers are connected through the fourth pipeline, and the boiler is equipped with an economizer. The present invention realizes the control of two or more boilers operating in parallel as a unit boiler, and minimizes the pressure drop of the boiler water supply regulating valve, thereby reducing the The outlet pressure of the feed water pump can effectively reduce the power consumption of the thermal power plant, save energy and reduce carbon emissions, and select high-efficiency energy-saving products to improve energy utilization; optimize design to reduce operation loss; optimize operation adjustment to achieve boiler water supply safety. The goal of reducing power consumption.

Description

A Stable Boiler Feed Water System with Reduced Pressure Loss

technical field

The invention belongs to the technical field of boiler water supply systems, and more specifically relates to a stable boiler water supply system with reduced pressure loss.

Background technique

Boilers are important energy sources in the power industry - power equipment for heat sources. With the increase of boiler capacity and improvement of parameters, the control of boiler becomes more and more important. Boiler feed water control cannot be adjusted based on the water level signal alone. Boiler water supply system is composed of three parts: furnace economizer water supply system, natural water circulation system, furnace pipe air, and water discharge system. Boiler feed water enters economizer inlet header through electric gate valve and check valve, and is horizontally arranged The reverse flow serpentine pipe, the economizer hanging pipe, and the 3 economizer outlet connecting pipes enter the steam drum.

After retrieval, the patented energy-saving and consumption-reducing boiler water supply system with application number 202123396114.7 includes soft water tanks, economizers, boilers, filters, heat exchangers, inclined plate settling tanks, and filter tanks. The outlet pipes of the soft water tanks are sequentially After passing through the heat exchanger and the economizer, it is connected to the water inlet of the boiler. The sewage pipe of the boiler is connected to the inclined plate settling tank after passing through the filter and the heat exchanger in turn. The clear liquid outlet of the inclined plate settling tank is connected to the filter tank, and the The clean water outlet is connected to the water inlet of the soft water tank. The boiler water supply system of the utility model has a simple structure, comprehensively utilizes boiler flue gas preheating and sewage preheating, and simultaneously recycles boiler sewage, and has the effect of saving energy and reducing consumption.

The patent with application number 201520283461.4 discloses a steam boiler water supply system. The steam boiler water supply system adopts the opening and closing valve to replace the water stop valve of the traditional steam boiler water supply system, and cuts off the boiler water return flow of the steam boiler. The beneficial effects achieved are: the airtight cut-off effect is better, and there is no phenomenon that boiler water flows back into the feed water pump; the system has stronger stability and higher safety and reliability.

In the above scheme and most of the current boilers are feeding water, the pressure drop of the boiler water supply regulating valve is relatively large, which increases the outlet pressure of the feed water pump, and the feed water pump is an important auxiliary equipment of the thermal power plant, and its power consumption accounts for a large part of the power consumption of the thermal power plant. , which increases power consumption, therefore, we propose a stable boiler feed water system with reduced pressure loss.

Contents of the invention

The purpose of the present invention is to solve the shortcomings in the prior art, realize the control of two or more boilers operating in parallel as a unit boiler, and minimize the pressure drop of the boiler water supply regulating valve, thereby reducing the outlet pressure of the feed water pump. Effectively reduce the power consumption of thermal power plants, save energy and reduce carbon, and select high-efficiency energy-saving products to improve energy utilization; optimize design, reduce operating losses; optimize operation adjustments, and achieve the goal of reducing power consumption on the premise of ensuring the safety of boiler water supply.

In order to achieve the above object, the present invention provides the following technical solutions: a stable boiler feed water system with reduced pressure loss, including a soft water tank, a heat exchanger, three sets of boilers, a filter, a settling tank, a first filter box and a second filter box tank, the water outlet of the soft water tank is connected with a first pipeline, one end of the first pipeline is provided with two sets of first water pumps in parallel, one end of the first water pump is connected with an opening and closing valve, the two sets of The open-close valve and the heat exchanger are communicated through the fourth pipeline. The boiler is equipped with an economizer, and a check valve is connected between the heat exchanger and the economizer. The three sets of boilers and the The filters are communicated, and the filter is communicated with the heat exchanger; the heat exchanger is communicated with the settling tank through the fifth pipeline, and the settling tank is communicated with the first filter tank through the sixth pipeline, The first filter box is connected to the second filter box through a seventh pipeline, and the second filter box is connected to the soft water tank through an eighth pipeline.

Preferably, the water outlet of the first water pump is provided with a second pipeline and a third pipeline in parallel, the second pipeline is connected to the water inlet of the opening and closing valve, and the third pipeline is connected to the water inlet of the opening and closing valve. control port.

Preferably, the first pipeline and the third pipeline are equipped with on-off switching valves for controller pipelines.

Preferably, a gate valve is connected to the end of the fourth pipeline close to the on-off valve, and a pressure gauge is connected to the end of the fourth pipeline close to the heat exchanger.

Preferably, the water outlet of the heat exchanger is connected to the water inlet of the economizer, and the water outlet of the economizer is connected to the boiler.

Preferably, a second water pump is installed on the sixth pipeline, a third water pump is installed on the seventh pipeline, and a fourth water pump is installed on the eighth pipeline.

Preferably, a motor is fixed at the bottom of the settling tank, and one end of the output shaft of the motor is fixedly connected to a rotating shaft through a coupling, and a stirring rod is fixed on the outer wall of the rotating shaft.

Preferably, a flocculant addition port is installed on the top of the settling tank, and the stirring rod is used to fully mix the added flocculant with impurities in the discharged sewage to form flocs.

Preferably, a first filter plate is installed on the inner upper end of the first filter box, the first filter plate is set as a PP cotton board, a second filter plate is installed inside the second filter box, and the second The filter plate is set as an activated carbon plate.

Technical effect and advantage of the present invention:

The invention realizes the control of two or more boilers operating in parallel as a unit boiler, and minimizes the pressure drop of the boiler water supply regulating valve, thereby reducing the outlet pressure of the feed water pump, which can effectively reduce the power consumption of the thermal power plant, save energy and reduce carbon, and Select high-efficiency and energy-saving products to improve energy utilization; optimize design to reduce operating loss; optimize operation adjustment to achieve the goal of reducing power consumption on the premise of ensuring the safety of boiler water supply.

Description of drawings

Fig. 1 is a system block diagram of the present invention.

In the figure: 1. Soft water tank; 2. First pipeline; 3. First water pump; 4. Second pipeline; 5. Third pipeline; 6. Opening and closing valve; 7. Gate valve; 8. Pressure gauge; 9. Heat exchanger; 10. Boiler; 11. Economizer; 12. Check valve; 13. Fourth pipeline; 14. Filter; 15. Settling tank; 16. First filter box; 17. Second Filter box; 18, fifth pipeline; 19, sixth pipeline; 20, seventh pipeline; 21, flocculant addition port; 22, motor; 23, rotating shaft; 24, stirring rod; 25, second water pump; 26. The third water pump; 27. The eighth pipeline; 28. The fourth water pump; 29. The first filter plate; 30. The second filter plate; 31. On-off valve.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, the present invention provides a kind of stable boiler feedwater system that reduces pressure loss, comprises soft water tank 1, heat exchanger 9, three groups of boilers 10, filter 14, settling tank 15, first filter box 16 and The second filter box 17 and the three groups of boilers 10 operate in parallel to minimize the pressure drop of the boiler water supply regulating valve, thereby reducing the outlet pressure of the feed water pump and achieving the goal of reducing power consumption. The water outlet of the soft water tank 1 is connected to the first pipeline 2 , one end of the first pipeline 2 is provided with two sets of first water pumps 3 in parallel, one end of the first water pump 3 is connected with an opening and closing valve 6, and the connection between the two sets of opening and closing valves 6 and the heat exchanger 9 is through a fourth pipeline 13 Connected, under the action of the pressure of the first water pump 3, the third pipeline 5 provided at the outlet of the first water pump 3 transmits the pressure to the upper piston of the opening and closing valve 6, and drives the valve to move downward through the valve stem, and the water supply channel is opened. Open until the downward force of the piston and the upward force of the spring are balanced;

An economizer 11 is installed inside the boiler 10, a check valve 12 is connected between the heat exchanger 9 and the economizer 11, the three groups of boilers 10 communicate with the filter 14, and the filter 14 communicates with the heat exchanger 9 ; The heat exchanger 9 communicates with the settling tank 15 through the fifth pipeline 18, and the settling tank 15 communicates with the first filter box 16 through the sixth pipeline 19. Between the first filter box 16 and the second filter box 17 The second filter box 17 is connected to the soft water tank 1 through the eighth pipeline 27 .

The water outlet of the first water pump 3 is provided with a second pipeline 4 and a third pipeline 5 in parallel, the second pipeline 4 is connected to the water inlet of the opening and closing valve 6, and the third pipeline 5 is connected to the control valve of the opening and closing valve 6. mouth.

Both the first pipeline 2 and the third pipeline 5 are equipped with on-off valves 31 for the on-off of the controller pipelines. The on-off valves 31 can first assist in controlling the on-off of their respective pipelines, so as to facilitate the opening and closing of the first water pump 3 and the opening and closing valves. 6 for disassembly and maintenance; secondly, the on-off valve 31 provided on the third pipeline 5 can indirectly assist the opening and closing of the on-off valve 6 by manual control to deal with emergencies.

The end of the fourth pipeline 13 close to the opening and closing valve 6 is connected with a gate valve 7. The gate valve 7 can completely cut off the pipeline controlled by it, so as to facilitate the repair and maintenance of the opening and closing valve 6 and the first water pump 3. The fourth pipeline One end of the road 13 close to the heat exchanger 9 is connected with a pressure gauge 8 .

The water outlet of the heat exchanger 9 is connected with the water inlet of the economizer 11 , and the water outlet of the economizer 11 is connected with the boiler 10 .

The second water pump 25 is installed on the sixth pipeline 19 , the third water pump 26 is installed on the seventh pipeline 20 , and the fourth water pump 28 is installed on the eighth pipeline 27 .

The bottom of the settling tank 15 is fixed with a motor 22, one end of the output shaft of the motor 22 is fixedly connected with a rotating shaft 23 through a coupling, and a stirring rod 24 is fixed on the outer wall of the rotating shaft 23.

The top of the settling tank 15 is equipped with a flocculant addition port 21, and the stirring rod 24 is used to fully mix the added flocculant with impurities in the discharged sewage to form flocs, and the sewage enters the settling tank 15 and adds flocculant Add flocculant into the mouth 21, and start the motor 22, the motor 22 drives the rotating shaft 23 to rotate, and the rotating shaft 23 drives the stirring rod 24 to rotate, so that the flocculant and the impurities in the sewage can be quickly and fully mixed to form flocs, and settle to the settling tank 15 bottom of the pool.

The inner upper end of the first filter box 16 is equipped with a first filter plate 29, the first filter plate 29 is set to a PP cotton plate, the first filter plate 29 filters the supernatant again, and the inside of the second filter box 17 is equipped with a second filter plate. Two filter plates 30, the second filter plate 30 is set as an activated carbon plate, the second filter plate 30 can remove the peculiar smell in the water and the like.

In summary, the present invention opens the gate valve 7 and the switch valve 31, starts the first water pump 3, and the first water pump 3 sucks the water in the soft water tank 1, and passes it through the opening and closing valve 6, the heat exchanger 9, the stop valve in sequence The return valve 12 and the economizer 11 are transported into the boiler 10, wherein the water in the soft water tank 1 first exchanges heat with the sewage of the boiler 10 in the heat exchanger 9 for preliminary preheating, and at the same time heats up the heat of the sewage. use, then enter the economizer 11, use the flue gas of the boiler 10 for further heating, and comprehensively utilize the heat of the flue gas of the boiler 10; finally enter the boiler 10 for heating, and when the water level in the boiler 10 reaches the rated requirement , the first water pump 3 is controlled to be closed, the check valve 12 intercepts part of the boiler return water, and the boiler furnace water return water is completely cut off at the opening and closing valve 6, and will not enter the first water pump 3;

The sewage in the boiler 10 enters the filter 14 to filter out some large particle impurities, and then enters the heat exchanger 9 to exchange heat with the water in the soft water tank 1 to reduce heat waste, and the cooled sewage enters the settling tank 15, And add flocculant to the flocculant addition port 21, and start the motor 22, the motor 22 drives the rotating shaft 23 to rotate, and the rotating shaft 23 drives the stirring rod 24 to rotate, so that the flocculant and the impurities in the sewage can be quickly and fully mixed to form flocs, and Settled to the bottom of the settling tank 15, then the second water pump 25 sucks the supernatant in the settling tank 15 into the first filter box 16, and the first filter plate 29 in the first filter box 16 filters the supernatant again , then the third water pump 26 pumps the filtered water into the second filter box 17, the second filter plate 30 in the second filter box 17 can remove the peculiar smell in the water, etc., and finally the fourth water pump 28 pumps the filtered water Water is pumped into the soft water tank 1, and then water recycling is realized.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still It is possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (9)

1. A stable boiler feed water system for reducing pressure loss, characterized in that it comprises a soft water tank (1), a heat exchanger (9), three groups of boilers (10), a filter (14), and a settling tank (15) , the first filter box (16) and the second filter box (17), the water outlet of the soft water tank (1) is connected with the first pipeline (2), and one end of the first pipeline (2) is arranged in parallel There are two groups of first water pumps (3), one end of the first water pumps (3) is connected with an on-off valve (6), and the two groups of on-off valves (6) and the heat exchanger (9) pass through the first The four pipelines (13) are connected, the inside of the boiler (10) is provided with an economizer (11), and a check valve (12) is connected between the heat exchanger (9) and the economizer (11) , three groups of boilers (10) communicated with the filter (14), the filter (14) communicated with the heat exchanger (9); the heat exchanger (9) communicated with the settling tank (15) The fifth pipeline (18) communicates between the settling tank (15) and the first filter box (16) through the sixth pipeline (19), and the first filter box (16) communicates with the second filter box (16). The filter boxes (17) are connected through a seventh pipeline (20), and the second filter box (17) is connected with the soft water tank (1) through an eighth pipeline (27). 2. A stable boiler feed water system with reduced pressure loss according to claim 1, characterized in that: the water outlet of the first water pump (3) is provided with a second pipeline (4) and a third pipeline in parallel The second pipeline (4) is connected to the water inlet of the on-off valve (6), and the third pipeline (5) is connected to the control port of the on-off valve (6). 3. A stable boiler feed water system with reduced pressure loss according to claim 2, characterized in that: the first pipeline (2) and the third pipeline (5) are equipped with controller pipelines On-off switch valve (31). 4. A stable boiler feed water system with reduced pressure loss according to claim 1, characterized in that: the end of the fourth pipeline (13) close to the opening and closing valve (6) is connected with a gate valve (7) , a pressure gauge (8) is connected to one end of the fourth pipeline (13) close to the heat exchanger (9). 5. A stable boiler feedwater system with reduced pressure loss according to claim 1, characterized in that: the water outlet of the heat exchanger (9) is connected to the water inlet of the economizer (11), the The water outlet of the economizer (11) is communicated with the boiler (10). 6. A stable boiler feedwater system with reduced pressure loss according to claim 1, characterized in that: a second water pump (25) is installed on the sixth pipeline (19), and the seventh pipeline A third water pump (26) is installed on (20), and a fourth water pump (28) is installed on the eighth pipeline (27). 7. A stable boiler feedwater system with reduced pressure loss according to claim 1, characterized in that: a motor (22) is fixed at the bottom of the settling tank (15), and the output shaft of the motor (22) One end is fixedly connected with a rotating shaft (23) through a coupling, and a stirring rod (24) is fixed on the outer wall of the rotating shaft (23). 8. A stable boiler feedwater system with reduced pressure loss according to claim 7, characterized in that: a flocculant addition port (21) is installed on the top of the settling tank (15), and the stirring rod (24 ) is used to fully mix the added flocculant with the impurities in the discharged sewage to form flocs. 9. A stable boiler feedwater system with reduced pressure loss according to claim 7, characterized in that: a first filter plate (29) is installed on the inner upper end of the first filter box (16), and the first filter plate (29) is installed on the inner upper end of the first filter box (16), A filter plate (29) is set as a PP cotton plate, and a second filter plate (30) is installed inside the second filter box (17), and the second filter plate (30) is set as an activated carbon plate.

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