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Flue gas forced internal circulation boiler

An internal circulation and flue gas technology, which is applied to flue gas combustion, controlled combustion, gas fuel burners, etc., can solve the problems of uncontrollable flue gas recirculation in the furnace and poor energy pertinence, and achieves low power and resistance. The effect of small size and simple pipeline structure

Pending Publication Date: 2019-10-25
ZHEJIANG XIANCHUANG ENERGY TECH CO LTD
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Problems solved by technology

[0005] In order to solve the disadvantages of uncontrollable flue gas recirculation in the furnace and untargeted energy consumption of flue gas recirculation outside the furnace in the prior art, the invention discloses a gas-fired low-nitrogen combustion boiler with forced internal circulation. The traditional external circulation is replaced by internal circulation. to replace

Method used

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  • Flue gas forced internal circulation boiler
  • Flue gas forced internal circulation boiler

Examples

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Embodiment 1

[0028] A flue gas forced internal circulation boiler, comprising a furnace 4, a flue gas forced internal circulation system, a flue gas discharge pipe 5, a chimney 6, a fuel outlet 7, a combustion-supporting air channel 8, and a blower 10, and the flue gas forced internal circulation system includes a frequency conversion fan 3. Electric regulating valve, circulating flue gas inlet and circulating flue gas outlet 9, frequency conversion fan 3 is fixedly installed on the outer wall of furnace 4, the air inlet of frequency conversion fan 3 is connected with furnace 4, and the air outlet of frequency conversion fan is connected to circulating flue gas inlet Connected, the frequency conversion fan draws part of the flue gas from the medium flue gas temperature area inside the boiler and directly returns to the fuel nozzle of the furnace burner, and the frequency of the frequency conversion fan is set at 10~50HZ. The circulating flue gas is evenly mixed with the fuel before burning,...

Embodiment 2

[0034] A flue gas forced internal circulation boiler, the blower is turned on, the combustion-supporting air is input into the furnace through the combustion-supporting air channel, the fuel outlet is ignited, the frequency conversion fan is turned on, the flue gas in the furnace is sucked into the circulating flue gas inlet, and the flue gas is discharged through the circulating flue gas outlet. Mixing gas and fuel, under the premise of satisfying the power of the boiler, detect the NOx content in the flue gas discharged through the chimney, when the NOx in the discharged flue gas is greater than 30mg / Nm 3 At this time, the outflow of circulating flue gas is increased through the electric regulating valve and the frequency of the motor, the maximum opening of the valve is 95%, and the frequency of the motor is between 10 and 50HZ.

[0035] The application of the present invention can save energy consumption, and save about 50% of motor power consumption compared with the exist...

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Abstract

The invention discloses a flue gas forced internal circulation boiler. A part of flue gas is sucked from a medium flue gas temperature area inside the boiler through circulation to directly return toa fuel nozzle of a furnace combustor to be directly mixed with the fuel to dilute the fuel so as to reduce the mixing concentration of the fuel and oxygen, so that the combustion temperature is reduced; a horn-shaped nozzle is arranged at an outlet of the circulating flue gas, a denitrification adsorbent fills in a cavity of the nozzle to be used for reducing the content of nitrogen oxide in the circulating flue gas, meanwhile, flue gas outlet holes on the nozzle are designed, so that the circulating flue gas is uniformly sprayed in an emission form to be fully mixed with the fuel, in the caseof the amount of the circulating flue gas, the circulation amount of the flue gas is controlled by adjusting the frequency of a circulating fan or adjusting an air door; by monitoring the concentration of NOx in a flue gas emission pipe on line, the frequency of the circulating fan and the flow of combustion-supporting air are continuously adjusted to obtain optimal parameters so as to reduce theconcentration of NOx in the discharged flue gas.

Description

technical field [0001] The invention belongs to the technical field of environment-friendly combustion, and in particular relates to a flue gas forced internal circulation boiler. Background technique [0002] With the aggravation of environmental pollution and the increasing shortage of energy, people are paying more and more attention to energy saving and emission reduction through new combustion methods. Among them, flue gas recirculation technology has the advantages of reducing NOx emissions and improving combustion efficiency. It is widely used in industrial burners, boilers and other fields, and has achieved good energy saving and emission reduction effects. Through the reasonable design of flue gas recirculation realization form, circulation temperature and circulation volume, combustion can be effectively improved, pollution emission can be reduced and combustion efficiency can be improved, which is one of the important methods of energy saving and emission reductio...

Claims

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Application Information

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IPC IPC(8): F23C9/06F23C9/08F23C5/08F23D14/48F23L5/02F23N3/00F23N5/26B01D53/04
CPCF23C9/06F23C9/08F23C5/08F23D14/48F23L5/02F23N3/00F23N5/26B01D53/04F23C2202/20
Inventor 方振明郑向阳朱水芳
Owner ZHEJIANG XIANCHUANG ENERGY TECH CO LTD
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