CN217685105U - Gas boiler waste heat recycling system for reducing emission of nitrogen oxides - Google Patents
Gas boiler waste heat recycling system for reducing emission of nitrogen oxides Download PDFInfo
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- CN217685105U CN217685105U CN202221400359.4U CN202221400359U CN217685105U CN 217685105 U CN217685105 U CN 217685105U CN 202221400359 U CN202221400359 U CN 202221400359U CN 217685105 U CN217685105 U CN 217685105U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a gas boiler waste heat recycling system for reducing the discharge amount of nitrogen oxides, which comprises a boiler, wherein the exhaust end of the boiler is connected with a gas inlet pipe of a condensing energy saver, and a gas outlet pipe of the condensing energy saver is connected to a chimney; the circulating water outlet pipe of the condensing energy saver is divided into a first branch pipe and a second branch pipe by an electric three-way regulating valve, the first branch pipe is connected to an air preheating humidifier, a combustion-supporting gas inlet pipe, a combustion-supporting gas outlet pipe and a circulating water drain pipe are arranged on the air preheating humidifier, the combustion-supporting gas outlet pipe is connected with the gas inlet end of a boiler, and the circulating water drain pipe is connected with the circulating water inlet end of the condensing energy saver; the second branch pipe is connected with the heat medium inlet end of the plate heat exchanger, the heat medium outlet pipe of the plate heat exchanger is connected with the circulating water drain pipe, the refrigerant inlet end of the plate heat exchanger is connected with the water replenishing pipe of the deaerator, and the refrigerant outlet pipe of the plate heat exchanger is connected with the inlet end of the deaerator. The utility model discloses can realize ultralow nitrogen emission and energy-conserving recovery.
Description
Technical Field
The utility model belongs to the technical field of boiler emission reduction energy saving and consumption reduction technique and specifically relates to a gas boiler waste heat recovery utilizes system for reducing nitrogen oxide emission.
Background
As environmental pollution becomes more serious, the national degree of attention on environmental protection becomes higher and higher. The boiler exhaust smoke contains a large amount of pollutant gases such as particulate matters, nitric oxides, sulfur dioxide and the like, and in order to promote the green and environment-friendly low-nitrogen process, the NOx emission concentration is currently implemented to be lower than 50mg/Nm 3 The standard of (2). Although gas boilers have lower pollutant emissions, they also face the problem of reducing nitrogen emissions. At present, a mode of refluxing partial boiler tail gas to a boiler furnace is mostly adopted, and the production of nitrogen oxides is inhibited by increasing the flow rate of flue gas in the furnace and reducing the concentration of nitrogen, the concentration of oxygen and the temperature in the furnace, so that the content of nitrogen oxides in the tail gas is reduced. The emission reduction mode can cause the reduction of the fuel and air inlet amount of the hearth, thereby causing the reduction of the steam production amount and the heat efficiency of the boiler, and having the functions of no smoke, energy saving and recovery.
Disclosure of Invention
In order to solve the problem, the utility model provides a gas boiler waste heat recovery utilizes system for reducing nitrogen oxide emission specifically can take following technical scheme:
the utility model discloses a gas boiler waste heat recovery system for reducing nitrogen oxide emission, including the boiler, the exhaust end of boiler is connected with the gas inlet pipe of condensing energy-saving appliance, the gas outlet pipe of condensing energy-saving appliance is connected to the chimney; the condensation type energy saver comprises a condensation type energy saver, a combustion-supporting gas inlet pipe, a combustion-supporting gas outlet pipe and a circulating water drain pipe, wherein a circulating water outlet pipe of the condensation type energy saver is divided into a first branch pipe and a second branch pipe through an electric three-way regulating valve; the second branch pipe links to each other with plate heat exchanger's heat medium entrance point, plate heat exchanger's heat medium outlet pipe links to each other with circulating water drain pipe, and plate heat exchanger's refrigerant entrance point links to each other with the oxygen-eliminating device moisturizing pipe, and plate heat exchanger's refrigerant outlet pipe links to each other with the entrance point of oxygen-eliminating device.
The tail end of the first branch pipe is provided with a sprayer positioned at the top of the air preheating humidifier, so that liquid can be uniformly distributed, and uniform heat transfer is facilitated.
Be provided with temperature sensor on condensing energy-saving appliance's the circulating water outlet pipe, be provided with circulating water pump on the circulating water drain pipe of air preheating humidifier, temperature sensor sends signal to PLC and is used for control circulating water pump's operating condition realizes the automatically regulated to the oxygen-eliminating device moisturizing temperature.
A fan and a temperature sensor are arranged on a combustion-supporting gas outlet pipe of the air preheating humidifier, and the temperature sensor sends a signal to the PLC to control the opening degree of the electric three-way regulating valve to the first branch pipe, so that the automatic regulation of the temperature of the combustion-supporting gas is realized.
A bypass pipe is arranged between a combustion-supporting gas inlet pipe and a combustion-supporting gas outlet pipe of the air preheating humidifier, and an electric butterfly valve is arranged on the bypass pipe.
The utility model provides a gas boiler waste heat recovery utilizes system for reducing nitrogen oxide emission, simple structure, area are little, investment cost is low, through retrieving the waste heat in the flue gas, is used for heating the combustion air of humidification with partly waste heat, makes combustion air's nitrogen concentration, oxygen concentration reduce, the specific heat capacity increases to reject nitrogen oxide's formation, make NOx discharge concentration be less than 30mg Nm 3 Realizing ultra-low nitrogen emission; at the same time, the other one is put inPart of the waste heat is used for the deaerator to supplement water and heat, thereby effectively reducing the consumption of deaerated steam and achieving the purpose of energy-saving recovery.
Drawings
Fig. 1 is a schematic structural view of the middle box type building block of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific working procedures are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the gas boiler waste heat recycling system for reducing the discharge amount of nitrogen oxides of the present invention comprises a boiler 1, wherein the exhaust end of the boiler 1 is connected to the gas inlet pipe of a condensing type energy saver 2, and the gas outlet pipe of the condensing type energy saver 2 is connected to a chimney 3; the circulating water outlet pipe of the condensing economizer 2 is divided into a first branch pipe and a second branch pipe through an electric three-way regulating valve 4, wherein the first branch pipe is connected to an air preheating humidifier 5, the heat transfer is more uniform in order to enable the circulating water to be uniformly distributed, and the first branch pipe extends to the top of the inner side of the air preheating humidifier 5 and is provided with a sprayer. The air preheating humidifier 5 is provided with a combustion-supporting gas inlet pipe, a combustion-supporting gas outlet pipe and a circulating water drain pipe, the combustion-supporting gas outlet pipe is connected with the gas inlet end of the boiler 1, and the circulating water drain pipe is connected with the circulating water inlet end of the condensing energy saver 2; the second branch pipe is connected with the heat medium inlet end of the plate type heat exchanger 6, the heat medium outlet pipe of the plate type heat exchanger 6 is connected with the circulating water drain pipe, the refrigerant inlet end of the plate type heat exchanger 6 is connected with the water replenishing pipe of the deaerator, and the refrigerant outlet pipe of the plate type heat exchanger 6 is connected with the inlet end of the deaerator. Install temperature sensor 7 on the circulating water outlet pipe of above-mentioned condensing energy-saving appliance 2, install circulating water pump 8 on the circulating water drain pipe of air preheating humidifier 5, temperature sensor 7 sends the operating condition that the signal is used for controlling circulating water pump 8 to PLC, realizes the automatically regulated to the oxygen-eliminating device moisturizing temperature. A fan 9 and a temperature sensor 10 are installed on a combustion-supporting gas outlet pipe of the air preheating humidifier 5, and the temperature sensor 10 sends a signal to the PLC to control the opening of the electric three-way regulating valve 4 to the first branch pipe, so that the combustion-supporting gas temperature is automatically regulated.
When the boiler works, flue gas discharged by the boiler 1 is sent to the condensing energy saver 2 to exchange heat with circulating water in the condensing energy saver 2, the flue gas is cooled to 60 ℃ and then discharged to the atmosphere through the chimney 3, water vapor in the flue gas is condensed to release a large amount of heat to be absorbed by the circulating water, and the water temperature of the circulating water is raised to 55-60 ℃. After passing through the electric three-way regulating valve 4, part of the circulating water heated to 55-60 ℃ enters the air preheating humidifier 5 through the first branch pipe, is atomized by the nozzle and then carries out damp-heat exchange with combustion air entering the air preheating humidifier 5, so that the temperature of the combustion air is increased to about 55 ℃, the humidity is increased to about 97%, at the moment, the nitrogen concentration and the oxygen concentration in the air are reduced, the combustion air is sent to the boiler 1 by the fan 9, the combustion reaction temperature in the hearth can be reduced, the generation of nitrogen oxides is resisted, and the nitrogen oxide value is lower than 30mg/Nm 3 Meanwhile, the temperature of the combustion air is increased, so that more heat can be generated after the natural gas is combusted to heat the heat-carrying fluid of the boiler 1, the boiler 1 can output more heat, and the heat efficiency of the boiler 1 is improved; the other part of circulating water with the temperature of 55-60 ℃ enters the plate heat exchanger 6 through the second branch pipe, and exchanges heat with the water supplemented by the deaerator to increase the water supplemented temperature of the deaerator, so that the consumption of deaerated steam is effectively reduced, the return water temperature of a heating pipe network can be heated, and the consumption of natural gas is reduced.
A bypass pipe 11 can be further arranged between the combustion-supporting gas inlet pipe and the combustion-supporting gas outlet pipe of the air preheating humidifier 5, an electric butterfly valve 12 is arranged on the bypass pipe 11, when the air preheating humidifier needs to be overhauled, the air preheating humidifier 5 can be in short circuit, the bypass pipe 11 works, the system only plays a role in waste heat recovery, and the purpose of energy conservation can be further achieved.
It should be noted that in the description of the present invention, terms of orientation or positional relationship such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (5)
1. The utility model provides a gas boiler waste heat recovery utilizes system for reducing nitrogen oxide emission, its characterized in that: the device comprises a boiler, wherein the exhaust end of the boiler is connected with a gas inlet pipe of a condensing energy saver, and a gas outlet pipe of the condensing energy saver is connected to a chimney; the circulating water outlet pipe of the condensing energy saver is divided into a first branch pipe and a second branch pipe by an electric three-way regulating valve, the first branch pipe is connected to an air preheating humidifier, a combustion-supporting gas inlet pipe, a combustion-supporting gas outlet pipe and a circulating water drain pipe are arranged on the air preheating humidifier, the combustion-supporting gas outlet pipe is connected with the gas inlet end of a boiler, and the circulating water drain pipe is connected with the circulating water inlet end of the condensing energy saver; the second branch pipe is connected with a heat medium inlet end of the plate heat exchanger, a heat medium outlet pipe of the plate heat exchanger is connected with a circulating water drain pipe, a refrigerant inlet end of the plate heat exchanger is connected with a water replenishing pipe of the deaerator, and a refrigerant outlet pipe of the plate heat exchanger is connected with an inlet end of the deaerator.
2. The gas boiler waste heat recovery system for reducing emissions of nitrogen oxides according to claim 1, characterized in that: and the tail end of the first branch pipe is provided with a sprayer positioned at the top of the air preheating humidifier.
3. The gas boiler waste heat recovery system for reducing emissions of nitrogen oxides according to claim 1, characterized in that: the condensation type energy saver is characterized in that a water temperature sensor is arranged on a circulating water outlet pipe of the condensation type energy saver, a circulating water pump is arranged on a circulating water drainage pipe of the air preheating humidifier, and the water temperature sensor sends a signal to the PLC to control the working state of the circulating water pump.
4. The system for recycling waste heat of a gas boiler for reducing an amount of discharged nitrogen oxides as recited in claim 1, wherein: a fan and a temperature sensor are arranged on a combustion-supporting gas outlet pipe of the air preheating humidifier, and the temperature sensor sends a signal to the PLC to control the opening degree of the electric three-way regulating valve to the first branch pipe.
5. The gas boiler waste heat recovery system for reducing emissions of nitrogen oxides according to claim 1, characterized in that: a bypass pipe is arranged between a combustion-supporting gas inlet pipe and a combustion-supporting gas outlet pipe of the air preheating humidifier, and an electric butterfly valve is arranged on the bypass pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221400359.4U CN217685105U (en) | 2022-06-07 | 2022-06-07 | Gas boiler waste heat recycling system for reducing emission of nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221400359.4U CN217685105U (en) | 2022-06-07 | 2022-06-07 | Gas boiler waste heat recycling system for reducing emission of nitrogen oxides |
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| CN217685105U true CN217685105U (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221400359.4U Active CN217685105U (en) | 2022-06-07 | 2022-06-07 | Gas boiler waste heat recycling system for reducing emission of nitrogen oxides |
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| CN (1) | CN217685105U (en) |
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2022
- 2022-06-07 CN CN202221400359.4U patent/CN217685105U/en active Active
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