CN115854332A - Flue gas heat energy and condensate water utilization system - Google Patents

Abstract

The invention discloses a flue gas heat energy and condensed water utilization system, which comprises: the boiler is provided with a first flue; the flue gas cooling device comprises a condensed water tank and a second flue; a deoxygenated water tank; flue gas generated by boiler combustion enters a flue gas cooling device through a first flue for cooling; the flue gas and the water in the condensed water tank are subjected to heat exchange, the water in the condensed water tank is heated, the flue gas is cooled, and the cooled flue gas is discharged through a second flue; condensed water formed in the flue gas cooling process falls into a condensed water tank; the water in the condensed water tank is deoxidized by the deoxidizing water tank and then flows back to the boiler. According to the invention, when the heat energy of the flue gas generated by boiler combustion is utilized, the slightly alkaline softened water and boiler water are mixed into the slightly acidic condensed water generated by the flue gas, the acidic condensed water, the alkaline softened water and the boiler water are subjected to acid-base neutralization reaction, and the condensed water is heated by the flue gas to ensure that the flue gas condensed water does not contain acidic gas, so that the flue gas condensed water is the slightly alkaline water suitable for the boiler.

Description

A flue gas heat energy and condensed water utilization system

technical field

The invention relates to the technical field of flue gas and heat energy utilization, and more specifically, to a flue gas heat energy and condensed water utilization system.

Background technique

Currently, most boilers use natural gas as fuel. Since the main component of natural gas is methane, the combustion of methane mainly produces carbon dioxide and water, especially for gas-fired boilers that use natural gas as fuel, and the flue gas discharged from the boiler contains a lot of heat energy and water vapor. Although the natural gas is relatively pure, a small amount of acid gas may still be produced in the flue gas after combustion and dissolve in the condensed water, which will cause the condensed water produced by the flue gas to be acidic. The direct discharge of the flue gas into the atmosphere will cause air pollution and waste the flue gas. The heat energy contained in the air. Since the softened water of the boiler is alkaline, the boiler water in the boiler is more alkaline due to the continuous evaporation of steam. As the alkalinity of the boiler water increases, it is necessary to continuously add new softened water to the boiler water, thus further improving production. cost.

Therefore, how to provide a flue gas heat energy and condensed water utilization system to recycle the boiler flue gas and heat energy has become a technical problem that needs to be solved urgently in this field.

Contents of the invention

The object of the present invention is to provide a flue gas heat energy and condensed water utilization system to recycle the flue gas and heat energy of the boiler.

The present invention provides a flue gas heat energy and condensed water utilization system, comprising: a boiler, the boiler is provided with a first flue; a flue gas cooling device, including a condensed water tank and a second flue; a deoxygenated water tank; The flue gas generated by boiler combustion enters the flue gas cooling device through the first flue for cooling; the flue gas exchanges heat with the water in the condensed water tank, and the water in the condensed water tank heats up, and the The flue gas is cooled, and the cooled flue gas is discharged through the second flue; the condensed water formed during the flue gas cooling process falls into the condensed water tank; the water in the condensed water tank passes through the deoxygenated water tank Return to the boiler after deoxygenation.

Optionally, the flue gas cooling device further includes: an exchanger, the second flue is located at the top of the exchanger; the first horizontal flue, the second horizontal flue, the branch flue and the third flue , the first horizontal flue communicates with the first flue and is located below the condensed water tank, the second horizontal flue is located above the condensed water tank, the first horizontal flue and the A plurality of branch flues are communicated between the second horizontal flues, and the extended middle part of the branch flues is located inside the condensed water tank; a third flue communicating with the second horizontal flues is arranged above the second horizontal flues, The third flue extends into the lower part of the exchanger; a first main pipe, a second main pipe and branch pipes, the first main pipe and the second main pipe are arranged vertically and are respectively located at the level of the exchanger On both sides, a plurality of branch pipes are vertically connected with the first main pipe and the second main pipe in sequence, and the middle part of the extension of the branch pipes is located inside the exchanger; the first main pipe can be externally connected to a water source , the second main pipe communicates with the condensed water tank.

Optionally, a water collection tank is provided at the bottom of the exchanger, and an overflow pipe is provided at the upper part of the water collection tank, and the overflow pipe communicates with the condensation water tank.

Optionally, the water outlet of the condensed water tank is provided with a pH detector, and the water in the condensed water tank flows into the deaeration water tank after being detected by the pH detector; the flue gas heat energy and condensed water utilization system also It includes: a blowdown expansion tank, the high-temperature furnace water of the boiler can enter the blowdown expansion tank; when the pH detector detects that the PH value of the condensed water tank is acidic, the high-temperature furnace water of the boiler is introduced into the blowdown expansion tank After the high-temperature furnace water expands and flashes in the blowdown expansion tank, the pH value rises and then flows back to the condensed water tank to neutralize the acidic water in the condensed water tank.

Optionally, the flue gas heat energy and condensed water utilization system further includes: a blowdown cooling pool and a heat exchanger; the heat exchanger is arranged between the first main pipe and the external water source; the condensed water tank The upper part is provided with a gas collection chamber, and the gas in the gas collection chamber exchanges heat with the incoming water of the first main pipe in the heat exchanger to form condensed water and flows into the blowdown cooling pool.

Optionally, the high-temperature furnace water expanded and flashed in the blowdown expansion tank may flow into the blowdown cooling tank to neutralize the gas condensate in the gas collection chamber for acid-base neutralization.

Optionally, the flue gas heat energy and condensed water utilization system further includes: a sub-cylinder, the sub-cylinder includes a steam inlet and two steam outlets; the steam generated by the boiler can enter through the steam inlet The sub-cylinder, the steam in the sub-cylinder can enter the deaeration water tank through one of the steam outlets to heat the water in the deaeration water tank; the top of the sewage expansion tank is provided with a one-way Valve: the flash steam produced by the expansion and flash evaporation of the high-temperature furnace water through the blowdown expansion tank can be passed into the deaeration water tank through the one-way valve to heat the water in the deaeration water tank.

Optionally, the flue gas heat energy and condensed water utilization system further includes: a medicine box, which can add medicine to the deoxygenated water tank to adjust the pH value in the deoxygenated water tank.

Optionally, the flue gas heat energy and condensed water utilization system further includes: water treatment equipment; the water in the blowdown cooling pool can flow into the water treatment equipment for treatment before reuse.

Optionally, the flue gas heat energy and condensed water utilization system further includes: a water collecting tank, the high-temperature furnace water in the blowdown expansion tank flows into the water collecting tank; and the sewage cooling pool for water supply; a liquid level gauge is installed on the water collecting tank.

According to the technical content disclosed in the present invention, it has the following beneficial effects:

The invention utilizes the heat energy of the flue gas produced by burning clean energy natural gas in the boiler, and at the same time, the condensed water produced by the flue gas is acidic, and the acidic condensed water and alkali are mixed into the condensed water by adding alkaline softened water and boiler water. The acid-base neutralization reaction of the demineralized water and boiler water occurs, and then the condensed water is heated by the flue gas to ensure that the condensed water does not contain acid gas, so as to ensure that the condensed water of the flue gas is alkaline water quality suitable for boiler use, and finally the flue gas condensed water Condensed water in the air is recycled.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is the first part of a schematic diagram of a flue gas heat energy and condensed water utilization system provided according to an embodiment;

Fig. 2 is the second part of a schematic diagram of a flue gas heat energy and condensed water utilization system according to an embodiment.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The invention utilizes the thermal energy of flue gas discharged from the gas-fired boiler in two stages, and at the same time fully utilizes the condensed water. First, the heat energy of the boiler feed water and the flue gas is exchanged in the second-stage exchanger, the temperature of the flue gas is lowered, and the condensed water produced in the flue gas falls into the first-stage exchanger, that is, the water tank. Although the natural gas is relatively pure, a small amount of acid gas may still be produced in the flue gas after combustion and dissolve in the condensed water, which makes the condensed water produced by the flue gas slightly acidic. Since the softened water of the boiler is alkaline, the boiler water in the boiler is more alkaline due to the continuous evaporation of steam. Therefore, part of the softened water also flows into the water tank after passing through the secondary exchanger to mix with the condensed water. Part of the furnace water is mixed with the condensed water, so that the mixed condensed water is neutral or slightly alkaline. And the mixed condensed water exchanges heat with the flue gas in the water tank, and is heated by the flue gas to above 100 degrees Celsius. According to Dalton's law of partial pressure, various gases in the condensed water evaporate from the condensed water, so that it is alkaline The condensed water can enter the deaerator and be used by the boiler. The gas and water vapor evaporated from the condensed water exchange heat with the softened water of the boiler again, and the acidic condensed water after condensation is discharged into the outdoor cooling pool and mixed with the alkaline drainage of the boiler to undergo a chemical reaction, and the mixed water that is neutral or alkaline Then enter the water treatment equipment for treatment.

Referring to Fig. 1 and Fig. 2, the present invention provides a flue gas heat energy and condensed water utilization system, including: a boiler 1, the boiler is provided with a first flue 2; a flue gas cooling device, including a condensed water tank 10 and a second Flue 26; deoxygenated water tank 59; the flue gas produced by the combustion of the boiler 1 enters the flue gas cooling device through the first flue 2 for cooling; the flue gas is cooled with the water in the condensed water tank 10 heat exchange, the water in the condensed water tank 10 heats up, the flue gas cools down, and the cooled flue gas is discharged through the second flue 26; the condensed water formed during the flue gas cooling process falls into the Condensed water tank 10; the water in the condensed water tank 10 is deoxidized by the deoxygenated water tank 59 and then flows back to the boiler.

Further, the flue gas cooling device also includes: an exchanger 22, the second flue 26 is located on the top of the exchanger 22; the first horizontal flue 6, the second horizontal flue 14, the branch flue 8 And the third flue 104, the first horizontal flue 6 communicates with the first flue 2 and is located below the condensed water tank 10, and the second horizontal flue 14 is located above the condensed water tank 10 , between the first horizontal flue 6 and the second horizontal flue 14 are communicated with a plurality of branch flues 8, and the extended middle part of the branch flues 8 is located inside the condensate tank 10; the second The top of the horizontal flue 14 is provided with a third flue 104 communicating with it, and the third flue 104 extends into the lower part of the exchanger 22; the first main pipe 29, the second main pipe 23 and the branch pipe 27, so The first main pipe 29 and the second main pipe 23 are arranged vertically and are respectively located on the horizontal sides of the exchanger. Between the two main pipes 23 , the extension middle part of the branch pipe 27 is located inside the exchanger 22 ; the first main pipe 29 can be externally connected to a water source, and the second main pipe 23 communicates with the condensed water tank 10 .

Further, a water collecting tank is provided at the bottom of the exchanger 22 , and an overflow pipe is provided on the upper part of the water collecting tank, and the overflow pipe communicates with the condensed water tank 10 .

Further, the water outlet of the condensed water tank 10 is provided with a pH detector 39, and the water in the condensed water tank 10 flows into the deoxygenated water tank 59 after being detected by the pH detector 39; The water utilization system also includes: blowdown expansion tank 97, the high-temperature furnace water of the boiler 1 can enter the blowdown expansion tank 97; The high-temperature furnace water is introduced into the blowdown expansion tank 97, and after the high-temperature furnace water expands and flashes in the blowdown expansion tank 97, the pH value rises and can return to the condensed water tank 10 and the slightly acidic water in the condensed water tank 10. of water for acid-base neutralization.

Further, the flue gas heat energy and condensed water utilization system also includes: a sewage cooling pool 79, a heat exchanger 48; the heat exchanger 48 is arranged between the first main pipe 29 and the external water source; the The upper part of the condensed water tank 10 is provided with a gas collection chamber 36, and the gas in the gas collection chamber 36 forms condensed water after exchanging heat with the incoming water of the first main pipe 29 in the heat exchanger 48 and flows into the Sewage discharge cooling pool 79.

Further, the high-temperature furnace water expanded and flashed in the blowdown expansion tank 97 can flow into the blowdown cooling pool 79 and the condensed water of the gas in the gas collection chamber 36 for acid-base neutralization.

Further, the flue gas heat energy and condensed water utilization system also includes: a sub-cylinder 76, the sub-cylinder 76 includes a steam inlet and two steam outlets; the steam generated by the boiler 1 can pass through the steam inlet port into the sub-cylinder 76, the steam in the sub-cylinder 76 can enter the deaeration water tank 59 through one of the steam outlets, and the water in the deaeration water tank 59 is heated; the blowdown expansion tank The top of 97 is provided with a one-way valve 94; the flash steam produced after the high-temperature furnace water expands and flashes through the blowdown expansion tank 97 can be passed into the deaeration water tank 59 through the one-way valve 94, and the The water in the deaeration water tank 59 is heated.

Further, the flue gas heat energy and condensed water utilization system further includes: a medicine box 57 , which can add medicine to the deoxygenated water tank 59 to adjust the pH value in the deoxygenated water tank 59 .

Further, the flue gas heat energy and condensed water utilization system also includes: water treatment equipment 82; the water in the blowdown cooling pool 79 can flow into the water treatment equipment 82 for treatment before reuse.

Further, the flue gas heat energy and condensed water utilization system also includes: a water collection tank 86, the high-temperature furnace water in the blowdown expansion tank 97 flows into the water collection tank 86; The condensed water tank 10 and the sewage cooling pool 79 are supplied with water; the water collecting tank 86 is equipped with a second liquid level gauge 87 .

Specifically, the flue gas flow of the boiler is as follows: the boiler 1 uses clean energy natural gas as fuel, and the flue gas generated by the boiler 1 enters the first horizontal flue 6 of the first-stage flue gas exchanger through the first flue 2, and the first horizontal The flue 6 is respectively connected to the branch flue 8 through a plurality of inlet first valves 7, the branch flue 8 is in the condensate water tank 10, and the condensate water tank 10 is mainly condensed water, and the branch flue 8 is flue gas, and the flue gas and After the condensed water is heat-exchanged in the condensed water tank 10, the flue gas after the initial cooling enters the second horizontal flue 14 through the second valve 13 at the outlet of the branch flue 8, and the flue gas in the second horizontal flue 14 passes through the third cross flue. The flue 104 enters the flue gas exchanger 22 of the second stage, and the outlet of the third flue 104 is higher than the bottom of the exchanger 22, so that the condensed water at the bottom of the exchanger 22 can be prevented from flowing into the third flue 104 through the top of the third flue. Three flue 104. The flue gas in the exchanger 22 is filled with the demineralized water in the branch pipe 27 for heat exchange, and the low-temperature flue gas with very little water vapor content is cooled down again and enters the second flue 26 through the cone 25 before being discharged into the atmosphere. Here, the first-stage exchanger and the second-stage exchanger can also be made into a finished product, and only the butt pipe and the flue opening are reserved.

The process of generating, neutralizing and utilizing flue gas condensate is as follows: the softened water of the boiler enters the heat exchanger 48 through the first pipe 50 and the third valve 49, and exchanges heat with the gas generated by the flue gas condensate, and the preheated boiler Demineralized water flows out from the heat exchanger 48, and a part of boiler demineralized water enters the first main pipe 29 of the exchanger 22 through the fourth valve 47, the twenty-ninth pipeline 45, and the first electric valve 30. There are many branch pipes 27 in the exchanger 22 , on each branch pipe 27 there is a fifth water inlet valve 28 and a water outlet sixth valve 24, the flue gas is outside the branch pipe 27 in the exchanger 22, and the demineralized water is inside the branch pipe 27. The demineralized water in the first main pipe 29 enters into each branch pipe 27 through the fifth water inlet valve 28 respectively, and after the demineralized water and flue gas exchange heat in the exchanger 22, that is, the second-stage flue gas exchanger, after the temperature rises, The softened water flows out into the second main pipe 23 through the sixth valve 24 of each water outlet, and the softened water in the second main pipe 23 flows into the condensate tank 10 through the second pipe 21 and the third pipe 17, that is, the first-stage flue gas exchange device. Due to the heat exchange between the flue gas and the demineralized water in the exchanger 22, the temperature of the flue gas decreases, and the steam in the flue gas condenses to produce condensed water that falls into the first water collection tank 20 at the bottom of the exchanger, and at the same time, a small amount of acid gas may dissolve in condensed water. There are two drainage devices on both sides of the bottom of the first sump 20, that is, the condensed water in the first sump 20 can be discharged into the second sump 16 through the first drain pipe 19, and the first drain pipe 19 extends into the second sump 16 bottoms, the first overflow pipe 18 is arranged in the middle and upper part of the second water collecting tank 16, and the condensed water in the second water collecting tank 16 overflows through the first overflow pipe 18 again and enters the condensed water tank 10 through the first downpipe 15. In order to prevent a drainage device from draining smoothly, the condensed water in the first sump 20 can also be discharged into the third sump 33 through the second drain pipe 31, and the second drain pipe 31 also extends into the bottom of the third sump 33. There is a second overflow pipe 32 in the middle and upper part of the three water collecting tanks 33 , and the condensed water in the third water collecting tank 33 overflows through the second overflow pipe 32 and then is discharged into the condensed water tank 10 through the second downwater pipe 34 . The design of the above two drainage devices can make the water in the first sump 20 at the bottom of the exchanger 22 flow into the condensed water tank 10, while the steam in the condensed water tank 10 cannot enter the exchanger 22 through the drain device. Since there is alkaline demineralized water and acidic flue gas condensed water in the condensed water tank 10 , the condensed water and demineralized water are neutralized by acid and alkali in the condensed water tank 10 . A first liquid level gauge 37 is installed on the condensed water tank 10 . When the first liquid level gauge 37 detects that the liquid level of the water tank is too high, the opening of the first electric valve 30 can be reduced to reduce the amount of demineralized water entering the condensed water tank 10 . At this time, when the first pH detector 39 detects that the pH value of the condensed water tank 10 outlet water is still slightly acidic, the high-temperature furnace water of the boiler 1 can enter the blowdown expansion tank 97 through the second electric valve 103 and the fourth pipeline 102, and the blowdown expansion tank There is dividing plate 96 in 97, and dividing plate 96 is all communicated with blowdown expansion tank 97 up and down, and dividing plate 96 can make after flashing and the furnace water of lower temperature flow out preferentially. Therefore, after the high-temperature furnace water expands and flashes in the blowdown expansion tank 97, it flows to the other side of the divider through the bottom of the partition 96, and the overflow seventh valve 98 is installed in the middle and upper part of the blowdown expansion tank 97, and the furnace water passes through the seventh valve. After 98 overflows out of the sewage expansion tank 97, it enters the water collecting tank 86 through the fifth pipeline 89 and the sixth pipeline 88. A first blowdown valve 99 and a first blowdown pipe 100 are installed at the bottom of the sewage expansion tank 97, and a second liquid level gauge 87 is installed on the water collection tank 86 to ensure that there is always boiler drainage in the water collection tank 86 for utilization. The furnace water in the water collection tank 86 enters the first muffler 9 through the seventh pipeline 84 at the bottom, the first pump group 85, the eighth pipeline 101, the ninth pipeline 5, the third electric valve 12, and the thirtieth pipeline 11, The boiler water is released in the condensed water tank 10 through the first muffler 9 . Due to the evaporation of a large amount of water in boiler 1, the PH value of the boiler water is relatively alkaline, and the condensed water produced by gas combustion is not very acidic. An appropriate amount of boiler water can neutralize the acid-base with the flue gas condensed water. In this way, the flue gas condensate can be properly acid-base neutralized with the softened water and the boiler water, and even adjusted to be slightly alkaline water for the boiler to use. A second blowdown valve 41 and a second blowdown pipe 42 are installed at the bottom of the condensed water tank 10, which can be opened for regular blowdown. The neutral or alkaline condensed water in the condensed water tank 10 flows out of the condensed water tank 10, and passes through the temperature sensor 38, the first pH detector 39, the second pump group 40, the tenth pipeline 43, the eleventh pipeline 60, the fourth The electric valve 62 enters the deaeration head 64, thereby falls into the deaeration water tank 59 for use by the boiler. In order to prevent the water level of the deoxygenated water tank 59 from being low, that is, insufficient water, when the water level of the deoxygenated water tank 59 is low, the bypass fifth electric valve 54 is opened at this time, and the softened water passes through the first pipeline 50, the third valve 49, and the heat exchanger 48. After the fourth valve 47, it can enter the eleventh pipeline 60 through the twelfth pipeline 53, the fifth electric valve 54, and the thirteenth pipeline 55, and then enter the deoxygenation head 64 through the fourth electric valve 62 and fall into the deoxygenation Water tank 59, thereby guarantees that deaeration water tank water yield is sufficient. After the mixed water of condensed water and demineralized water in the deoxygenated water tank 59 is heated and deoxidized, the water in the deoxygenated water tank 59 enters the boiler 1 through the third pump group 58, the twenty-first pipeline 90, and the eighth valve 3 for supply. Boiler utilization. A second PH detector 63 is installed on the deoxygenated water tank. Even if the water in the deoxygenated water tank is slightly acidic, the alkaline medicine can be delivered to the deoxygenated water tank 59 through the medicine box 57 through the dosing pump 56 and the dosing pipe 61. , to ensure that the water in the deaeration water tank 59 must meet the partial alkaline requirement of boiler water.

Flash steam heat energy utilization process: and the condensed water in the condensed water tank 10 is heated by the flue gas, and the condensed water is heated to above 100 degrees Celsius. According to Dalton's law of partial pressure, various gases in the condensed water will overflow from the water, thereby ensuring There is no oxygen, no carbon dioxide and other gases in the condensed water. Therefore, the condensed water in the condensed water tank 10 is heated to more than 100 degrees Celsius by the flue gas, and various gases and water vapor overflowing from the condensed water enter the gas collection chamber 36, pass through the twenty-second pipeline 35, the twenty-third pipeline 44, the ninth The valve 46 enters the heat exchanger 48 to exchange heat with the demineralized water. After condensation, the possibly acidic condensed water flows out from the heat exchanger 48 and passes through the tenth valve 51, the twenty-fourth pipeline 52, the fourteenth pipeline 68, the first The valve 77 enters the blowdown cooling pool 79. And after part of the drainage of the boiler 1 enters the water collection tank 86 through the sewage expansion tank 97, part of the redundant drainage can enter the sewage cooling pool 79 through the seventh pipeline 84, the fifteenth pipeline 83, and the sixth electric valve 78, so that the boiler water Neutralization reaction occurs with acidic condensed water in the blowdown cooling tank 79, and the neutral or slightly alkaline water enters the water treatment equipment 82 through the fourth pump group 80 and the sixteenth pipeline 81 to be processed and then used. The flash steam produced by the sewage expansion tank 97 passes through the eleventh valve 95, the one-way valve 94, the seventeenth pipeline 93, the eighteenth pipeline 92, the nineteenth pipeline 69, the twentieth pipeline 67, and the seventh electric valve 66. Enter the second muffler 70, and then disperse into the water from the second muffler 70, thereby heating the condensed water and demineralized water in the deaeration water tank 59. When the temperature in the deaeration water tank 59 can not reach 100 degrees Celsius, the steam produced by the boiler 1 enters the sub-cylinder 76 through the twelfth valve 4, the twenty-fifth pipeline 91, the twenty-sixth pipeline 73, and the thirteenth valve 75, The steam in the sub-cylinder 76 also enters the nineteenth pipeline 69 through the fourteenth valve 71 and the twenty-seventh pipeline 105, and enters the second silencer through the nineteenth pipeline 69, the twentieth pipeline 67 and the seventh electric valve 66. device 70, thereby heating the water in the deaeration water tank 59. The gas overflowing in the deaeration water tank 59 is discharged through the discharge pipe 65 at the top after heat exchange with the water inlet through the deaeration head 64, thereby ensuring that the water in the deaerator does not contain oxygen and other gases, and the water in the deaeration water tank 59 It is then used by the boiler 1. And the steam in the sub-cylinder 76 can also be used for production and life through the fifteenth valve 74, the twenty-eighth pipeline 72.

In summary, the present invention utilizes the thermal energy of the flue gas produced by burning clean energy natural gas in the boiler, and at the same time, the condensed water produced by the flue gas is acidic, and the acidic condensed water is allowed to condense by adding alkaline softened water and boiler water into the condensed water. Water, alkaline softened water and furnace water undergo acid-base neutralization reaction, and then heat the condensed water through flue gas to ensure that the flue gas condensed water does not contain acid gas, so as to ensure that the flue gas condensed water is alkaline water quality suitable for boilers. Finally, the condensed water in the flue gas is recycled.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. The utility model provides a flue gas heat energy and condensate water utilize system which characterized in that includes:

a boiler (1) provided with a first flue (2);

the flue gas cooling device comprises a condensed water tank (10) and a second flue (26);

a deoxygenated water tank (59);

the flue gas generated by the combustion of the boiler (1) enters the flue gas cooling device for cooling through the first flue (2); the flue gas and the water in the condensed water tank (10) exchange heat, the water in the condensed water tank (10) is heated, the flue gas is cooled, and the cooled flue gas is discharged through the second flue (26); condensed water formed in the flue gas cooling process falls into the condensed water tank (10); and water in the condensed water tank (10) is deoxidized by the deoxidizing water tank (59) and then flows back to the boiler.

2. The system for utilizing heat energy and condensed water in flue gas of claim 1, wherein said flue gas cooling device further comprises:

an exchanger (22), the second flue (26) being located at the top of the exchanger (22);

the first transverse flue (6) is communicated with the first flue (2) and is positioned below the condensed water tank (10), the second transverse flue (14) is positioned above the condensed water tank (10), a plurality of branch flues (8) are communicated between the first transverse flue (6) and the second transverse flue (14), and the extending middle part of each branch flue (8) is positioned inside the condensed water tank (10); a third flue (104) communicated with the second transverse flue (14) is arranged above the second transverse flue (14), and the third flue (104) extends into the lower part of the exchanger (22);

the heat exchanger comprises a first main pipe (29), a second main pipe (23) and branch pipes (27), wherein the first main pipe (29) and the second main pipe (23) are vertically arranged and are respectively positioned at two horizontal sides of the heat exchanger, a plurality of branch pipes (27) are sequentially communicated with the space between the first main pipe (29) and the second main pipe (23) along the vertical direction, and the extending middle parts of the branch pipes (27) are positioned in the heat exchanger (22);

the first header pipe (29) can be externally connected with a water source, and the second header pipe (23) is communicated with the condensed water tank (10).

3. The flue gas heat energy and condensed water utilization system of claim 2, wherein:

a water collecting tank is arranged at the bottom of the exchanger (22), an overflow pipe is arranged at the upper part of the water collecting tank, and the overflow pipe is communicated with the condensed water tank (10).

4. The flue gas heat energy and condensed water utilization system of claim 3, wherein:

a PH detector (39) is arranged at a water outlet of the condensed water tank (10), and water in the condensed water tank (10) flows into the deoxygenation water tank (59) after being detected by the PH detector (39);

the flue gas heat energy and condensed water utilization system further comprises: the blow-down expansion tank (97), the high-temperature boiler water of the boiler (1) can enter the blow-down expansion tank (97);

when the PH detector (39) detects that the PH value of the effluent of the condensate tank (10) is acidic, high-temperature furnace water of the boiler (1) is led into the blow-off expansion tank (97), and the high-temperature furnace water can flow back to the condensate tank (10) and acidic water in the condensate tank (10) for acid-base neutralization after the PH value of the high-temperature furnace water is increased after expansion and flash evaporation in the blow-off expansion tank (97).

5. The system for utilizing heat energy and condensed water in flue gas as claimed in claim 4, wherein the system for utilizing heat energy and condensed water in flue gas further comprises:

a blowdown cooling pool (79) and a heat exchanger (48);

the heat exchanger (48) is arranged between the first header pipe (29) and the external water source;

an air collection chamber (36) is arranged at the upper part of the condensed water tank (10), and air in the air collection chamber (36) is subjected to heat exchange with incoming water of the first main pipe (29) in the heat exchanger (48) to form condensed water and flows into the pollution discharge cooling pool (79).

6. The flue gas heat energy and condensed water utilization system of claim 5, wherein:

the high-temperature furnace water after expansion and flash evaporation in the sewage expansion tank (97) can flow into the sewage cooling pool (79) to perform acid-base neutralization with condensed water of gas in the gas collection chamber (36).

7. The system for utilizing heat energy and condensed water of flue gas as claimed in claim 5 or 6, wherein the system for utilizing heat energy and condensed water of flue gas further comprises:

a steam-splitting cylinder (76), wherein the steam-splitting cylinder (76) comprises a steam inlet and two steam outlets;

steam generated by the boiler (1) can enter the steam-dividing cylinder (76) through the steam inlet, the steam in the steam-dividing cylinder (76) can enter the deoxygenating water tank (59) through one steam outlet, and the water in the deoxygenating water tank (59) is heated;

the top of the sewage discharge expansion tank (97) is provided with a one-way valve (94);

the high temperature furnace water through flash steam that produces behind blowdown expansion tank (97) expansion flash distillation can pass through check valve (94) lets in deoxidization water tank (59), and is right water in the deoxidization water tank (59) heats.

8. The system for utilizing heat energy of flue gas and condensed water as claimed in any one of claims 1 to 6, wherein the system for utilizing heat energy of flue gas and condensed water further comprises:

a medicine box (57), wherein the medicine box (57) can add medicine into the deoxygenated water tank (59) to adjust the pH value in the deoxygenated water tank (59).

9. The system for utilizing heat energy and condensed water of flue gas as claimed in claim 5 or 6, wherein the system for utilizing heat energy and condensed water of flue gas further comprises:

a water treatment device (82);

the water in the blowdown cooling pond (79) can flow into the water treatment equipment (82) for treatment and then be reused.

10. The system for utilizing heat energy and condensed water of flue gas as claimed in claim 5 or 6, wherein the system for utilizing heat energy and condensed water of flue gas further comprises:

a water collecting tank (86), wherein high-temperature furnace water in the sewage expansion tank (97) flows into the water collecting tank (86); the water collecting tank (86) can respectively supply water to the condensed water tank (10) and the blowdown cooling pool (79);

and a second liquid level meter (87) is arranged on the water collecting tank (86).

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