Centralized treatment white smoke elimination device for flue gas heat recovery desulfurization and denitrification

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By designing a centralized treatment and whitening device for flue gas heat recovery, desulfurization and denitrification, and using an efficient heat exchange module to condense the flue gas, the problem of incomplete smoke exhaust treatment in traditional boilers is solved, and the effects of flue gas heat recovery and energy saving and carbon reduction are achieved.

CN222783534UActive Publication Date: 2025-04-22SHANGHAI HANCHENG OPERATION & MAINTENANCE ENERGY SAVING TECHNOLOGY CO LTD

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Patent Information

Application Number: CN202421083747.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-17
Publication Date: 2025-04-22
Estimated Expiration: 2034-05-17

AI Technical Summary

Technical Problem

The traditional boiler smoke exhaust treatment device is not completely treated, resulting in a large amount of latent heat and sensible heat in the flue gas, and the energy-saving and carbon reduction effect is poor. At the same time, the suction force changes caused by changes in the boiler operating load and outdoor temperature changes cause changes in the combustion excess air coefficient, increase the heat loss of smoke exhaust, and decrease the efficiency of the boiler.

Method used

A centralized treatment and desulfurization device for flue gas heat recovery, desulfurization and denitrification is designed, including flue gas treatment body, pre-cooling section, reaction chamber, water barrier section and fan section. The heat exchange device and spray device are installed internally, and connected to the flue gas treatment body through a water source heat pump. The flue gas condensation is used to reduce the smoke exhaust temperature, and the flue gas condensation heat and sensible heat are recovered.

Benefits of technology

Effectively reduce the smoke exhaust temperature to below 40 degrees Celsius, recover a large amount of condensation and sensible heat of flue gas, reduce the water content of flue gas, improve the white smoke site at the discharge port, and at the same time, the high-temperature hot water is supplied through the flue gas recovery heat, significantly improve the heating capacity, reduce energy consumption, and significantly improve the energy-saving and carbon reduction effect.

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Abstract

The utility model discloses a centralized treatment white smoke elimination device for flue gas heat recovery desulfurization and denitrification, and relates to the technical field of flue gas treatment. The flue gas treatment device comprises a flue gas treatment machine body, a transition pipeline is arranged at one end of the flue gas treatment machine body, one end of the transition pipeline is connected with a flue gas pipe, the flue gas pipe is communicated with the transition pipeline, the flue gas treatment machine body internally comprises a pre-cooling section, a reaction chamber, a water retaining section and a fan section, and a heat exchange device is installed in the pre-cooling section. A second condensate water discharge port and a water source heat pump are mounted on the peripheral side surface of the flue gas treatment machine body. The heat exchange device is arranged to guarantee the smoke condensation effect, the smoke exhaust temperature is reduced to be below 40 DEG C, a large amount of smoke condensation heat and sensible heat are recycled, the water content of smoke is greatly reduced, the white smoke site at a discharge outlet is obviously improved, meanwhile, the water source heat pump supplies high-temperature hot water outwards through heat recycled by the smoke, and the heat utilization rate of the water source heat pump is improved. And the energy efficiency is very high, the heat supply capacity can be obviously improved, the energy consumption is reduced, and the energy-saving and carbon-reducing effects are obvious.

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Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas treatment, and particularly relates to a centralized treatment and denitration device for flue gas heat recovery, desulfurization and denitration. Background Art

[0002] The exhaust temperature of civil boilers is usually to meet the national standard efficiency of boilers and take energy saving into consideration. Conventional primary heat exchangers are used to recover heat from the flue gas. The heat recovery heat exchanger independently produces hot water or heats the burner inlet air. The exhaust temperature is above 100 degrees Celsius to ensure natural discharge of flue gas and avoid corrosion of flue gas condensation. However, there is still a large amount of latent heat and sensible heat of flue gas in the flue gas that have not been utilized, and there is great potential for energy conservation and carbon reduction. In addition, the flue gas emission utilizes the natural suction of high-temperature flue gas for discharge. The suction changes caused by the load changes of boiler operation and the outdoor temperature changes cause the changes in the excess air coefficient of boiler combustion, the increase in exhaust heat loss, and the decrease in boiler efficiency. In order to solve the above problems, a centralized treatment and denitrification device for flue gas heat recovery, desulfurization and denitrification is designed. It can effectively solve the problems that the traditional boiler exhaust treatment device has incomplete treatment, resulting in a large amount of latent heat and sensible heat of flue gas in the flue gas that have not been utilized, and the energy conservation and carbon reduction effect is poor, as well as the problems that the suction changes caused by the load changes of boiler operation and the outdoor temperature changes cause the changes in the excess air coefficient of boiler combustion, the increase in exhaust heat loss, and the decrease in boiler efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a centralized treatment and desulfurization and denitrification device for flue gas heat recovery to solve the problems that the traditional boiler exhaust treatment device does not completely treat the flue gas, resulting in a large amount of flue gas latent heat and flue gas sensible heat not being utilized, the energy saving and carbon reduction effect is poor, and the load change of the boiler operation and the change of the draft caused by the change of the outdoor temperature cause the change of the excess air coefficient of the boiler combustion, the increase of the exhaust heat loss, and the decrease of the boiler efficiency:

[0004] The utility model is a centralized treatment and denitration device for flue gas heat recovery, desulfurization and denitration, comprising a flue gas treatment body, one end of which is provided with a transition pipe, the transition pipe is connected to the flue gas treatment body, one end of the transition pipe is connected to a smoke pipe, the smoke pipe is connected to the transition pipe;

[0005] The flue gas treatment body includes a precooling section, a reaction chamber, a water retaining section and a fan section. A heat exchange device is installed inside the precooling section. A second condensate discharge port and a water source heat pump are installed on the side surface of the flue gas treatment body. The water source heat pump and the second condensate discharge port are both connected to the precooling section. By arranging the flue gas treatment body and the water source heat pump, low-temperature cold water is produced by the water source heat pump, and heat is exchanged through the heat exchange device in the precooling section in the flue gas treatment body. An efficient and compact heat exchange module is adopted. By arranging the heat exchange device, the flue gas condensation effect is ensured, and the exhaust temperature is reduced to 40 degrees Celsius Below the temperature, a large amount of flue gas condensation heat and sensible heat are recovered, the water content of the flue gas is greatly reduced, and the white smoke scene at the discharge port is significantly improved. At the same time, the water source heat pump supplies high-temperature hot water to the outside through the heat recovered from the flue gas, which has high energy efficiency, can significantly improve the heating capacity, reduce energy consumption, and has obvious energy-saving and carbon-reduction effects. This device can be used with a refrigeration system at the same time to recover the waste heat of the refrigeration unit, and has greater energy-saving and carbon-reduction space. The heat exchange device in the pre-cooling section is divided into two levels. The first pre-cooling section directly recovers heat, and the second pre-cooling section is connected to the water source heat pump. Each pre-cooling section has a condensate discharge port.

[0006] Furthermore, the reaction chamber is located between the pre-cooling section and the water retaining section, and a spray device is installed inside the reaction chamber.

[0007] Furthermore, a water retaining plate is installed on the inner peripheral side surface of the water retaining section.

[0008] Furthermore, a guide pipe is provided at one end of the water retaining section, the guide pipe is connected to the fan section, and one end of the guide pipe is connected to a smoke outlet.

[0009] Furthermore, a liquid tank pump group and a first condensate discharge port are provided on the side surface of the flue gas treatment body, and both the liquid tank pump group and the first condensate discharge port are connected to the inside of the water retaining section, and one end of the liquid tank pump group is connected to an alkali liquid tank pump group. The liquid tank pump group and the alkali liquid tank pump group supplement alkaline substances for the condensation circulating water.

[0010] Furthermore, a motor is installed at one end of the flue gas treatment body, and one end of the motor is connected to an impeller, and the impeller is located in the fan section. A motor is arranged at the rear end of the flue gas treatment body to drive the impeller as the exhaust power of the flue gas system. The output of the motor is adjusted by controlling the back pressure value of the boiler flue gas outlet.

[0011] Furthermore, a stainless steel square frame is fixedly installed on the side surface of the flue gas treatment body.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model ensures the flue gas condensation effect by arranging a heat exchange device, and the exhaust gas temperature drops to below 40 degrees Celsius, recovering a large amount of flue gas condensation heat and sensible heat, greatly reducing the water content of the flue gas, and significantly improving the white smoke scene at the discharge port. At the same time, the water source heat pump supplies high-temperature hot water to the outside through the heat recovered from the flue gas, which has high energy efficiency, can significantly improve the heating capacity, reduce energy consumption, and has obvious energy-saving and carbon-reduction effects. This device can be used in conjunction with a refrigeration system to recover the waste heat of the refrigeration unit, leaving more room for energy saving and carbon reduction.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the internal structure of the smoke treatment body of the utility model;

[0017] Figure 2 It is the front view of the utility model.

[0018] In the attached drawings, the list of components represented by each reference numeral is as follows: 1. Pressure sensor; 2. Transition duct; 3. Precooling section; 4. Reaction chamber; 5. Water baffle; 6. Guide pipe; 7. Impeller; 8. Motor; 9. Flue gas outlet; 10. Stainless steel square frame; 11. First condensate discharge port; 12. Liquid storage tank with pump group; 13. Alkali liquid tank with pump group; 14. Spraying device; 15. Second condensate discharge port; 16. Water source heat pump; 17. Heat exchange device; 18. Smoke duct; 19. Flue gas treatment body; 20. Water baffle section; 21. Fan section. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.

[0021] See also Figure 1-Figure 2 As shown, the utility model is a centralized treatment and denitration device for flue gas heat recovery, desulfurization and denitration, comprising a flue gas treatment body 19, one end of the flue gas treatment body 19 is provided with a transition pipe 2, the transition pipe 2 is connected to the flue gas treatment body 19, one end of the transition pipe 2 is connected to a smoke pipe 18, the smoke pipe 18 is connected to the transition pipe 2;

[0022] The flue gas treatment body 19 includes a precooling section 3, a reaction chamber 4, a water retaining section 20 and a fan section 21. A heat exchange device 17 is installed in the precooling section 3. A second condensate discharge port 15 and a water source heat pump 16 are installed on the side of the flue gas treatment body 19. The water source heat pump 16 and the second condensate discharge port 15 are both connected to the precooling section 3. By setting the flue gas treatment body 19 and the water source heat pump 16, the water source heat pump 16 produces low-temperature cold water, and heat is exchanged through the heat exchange device 17 in the precooling section 3 in the flue gas treatment body 19. An efficient and compact heat exchange module is adopted, and the flue gas condensation effect is ensured by setting the heat exchange device 17. The exhaust gas temperature drops to below 40 degrees Celsius, a large amount of flue gas condensation heat and sensible heat are recovered, the water content of the flue gas is greatly reduced, and the white smoke scene at the exhaust port is significantly improved. At the same time, the water source heat pump 16 supplies high-temperature hot water to the outside through the heat recovered from the flue gas, which has high energy efficiency, can significantly improve the heating capacity, reduce energy consumption, and have obvious energy-saving and carbon-reduction effects. This device can be used with a refrigeration system at the same time to recover the waste heat of the refrigeration unit, and has greater energy-saving and carbon-reduction space. The heat exchange device 17 of the precooling section 3 is divided into two levels. The first precooling section directly recovers heat, and the second precooling section is connected to the water source heat pump. Each precooling section has a condensate discharge port.

[0023] The reaction chamber 4 is located between the precooling section 3 and the water retaining section 20 , and a spray device 14 is installed inside the reaction chamber 4 .

[0024] A water retaining plate 5 is installed on the inner peripheral side of the water retaining section 20 .

[0025] A flow guide pipe 6 is provided at one end of the water retaining section 20 . The flow guide pipe 6 is connected to the fan section 21 . A smoke outlet 9 is connected to one end of the flow guide pipe 6 .

[0026] A liquid storage tank pump group 12 and a first condensate discharge port 11 are arranged on the side of the flue gas treatment body 19. The liquid storage tank pump group 12 and the first condensate discharge port 11 are both connected to the inside of the water retaining section 20. One end of the liquid storage tank pump group 12 is connected to an alkali liquid tank pump group 13.

[0027] A motor 8 is installed at one end of the flue gas treatment body 19, and one end of the motor 8 is connected to an impeller 7, which is located in the fan section 21. The motor 8 is arranged at the rear end of the flue gas treatment body 19 to drive the impeller 7 as the exhaust power of the flue gas system. The output of the motor 8 is adjusted by controlling the back pressure value of the boiler flue gas outlet.

[0028] A stainless steel square frame 10 is fixedly mounted on the side of the flue gas treatment body 19 .

[0029] Embodiment 1:

[0030] A specific application of this embodiment is: when the device is in use, the flue gas enters the flue gas treatment body 19 through the smoke pipe 18, and the water source heat pump 16 produces low-temperature cold water, which is exchanged through the heat exchange device 17 in the pre-cooling section 3 in the flue gas treatment body 19. An efficient and compact heat exchange module is adopted, and the flue gas condensation effect is ensured by setting the heat exchange device 17. The exhaust temperature is reduced to below 40 degrees Celsius, a large amount of flue gas condensation heat and sensible heat are recovered, the water content of the flue gas is greatly reduced, and the white smoke scene at the discharge port is significantly improved. At the same time, the water source heat pump 16 supplies high-temperature hot water to the outside through the heat recovered from the flue gas, which has high energy efficiency, can significantly improve the heating capacity, reduce energy consumption, and has obvious energy-saving and carbon-reduction effects. This device can be used in conjunction with a refrigeration system to recover the waste heat of the refrigeration unit, and has a larger space for energy saving and carbon reduction. The model of the motor 8 used is YE2-100.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A centralized flue gas heat recovery desulfurization and denitrification treatment and denitrification device, comprising a flue gas treatment body (19), characterized in that: A transition duct (2) is provided at one end of the flue gas treatment body (19), the transition duct (2) is in communication with the flue gas treatment body (19), and a smoke pipe (18) is connected to one end of the transition duct (2), the smoke pipe (18) is in communication with the transition duct (2); The flue gas treatment body (19) comprises a pre-cooling section (3), a reaction chamber (4), a water retaining section (20) and a fan section (21); a heat exchange device (17) is installed inside the pre-cooling section (3); a second condensate discharge port (15) and a water source heat pump (16) are installed on the side surface of the flue gas treatment body (19); the water source heat pump (16) and the second condensate discharge port (15) are both connected to the pre-cooling section (3).

2. The centralized treatment and denitrification device for flue gas heat recovery, desulfurization and denitrification according to claim 1 is characterized in that: The reaction chamber (4) is located between the precooling section (3) and the water retaining section (20), and a spray device (14) is installed inside the reaction chamber (4).

3. The centralized treatment and denitration device for flue gas heat recovery, desulfurization and denitrification according to claim 1 is characterized by: A water retaining plate (5) is installed on the inner peripheral side surface of the water retaining section (20).

4. The centralized treatment and denitrification device for flue gas heat recovery, desulfurization and denitrification according to claim 1 is characterized by: A flow guide pipe (6) is provided at one end of the water retaining section (20), the flow guide pipe (6) is connected to the fan section (21), and one end of the flow guide pipe (6) is connected to a smoke outlet (9).

5. The centralized treatment and denitration device for flue gas heat recovery, desulfurization and denitrification according to claim 1 is characterized by: The flue gas treatment body (19) is provided with a liquid storage tank pump assembly (12) and a first condensate discharge port (11) on the peripheral side thereof; the liquid storage tank pump assembly (12) and the first condensate discharge port (11) are both connected to the interior of the water retaining section (20); and one end of the liquid storage tank pump assembly (12) is connected to an alkali liquid tank pump assembly (13).

6. The centralized treatment and denitration device for flue gas heat recovery, desulfurization and denitrification according to claim 1 is characterized by: A motor (8) is installed at one end of the flue gas treatment body (19), and one end of the motor (8) is connected to an impeller (7), and the impeller (7) is located in the fan section (21).

7. The centralized treatment and denitrification device for flue gas heat recovery, desulfurization and denitrification according to claim 1 is characterized by: A stainless steel square frame (10) is fixedly mounted on the side surface of the flue gas treatment body (19).