Gas inlet control device for stabilizing nitrogen oxide emission of gas-fired boiler

Abstract

The utility model discloses an air inlet control device for stabilizing nitrogen oxide emission of a gas-fired boiler. The air inlet control device comprises an electric air valve, a transition flange, an air duct and a filtering assembly. The electric air valve is arranged at an air inlet of a boiler induced draft fan, the transition flange is of a reducing structure, and the large end is connected with an air inlet of the electric air valve. The small opening end of the air duct is connected with the small end of the transition flange; the filtering assembly is arranged at the large-opening end of the air duct. The filter assembly and the air duct are arranged in a horn-shaped structure, the air inlet amount in the boiler is not affected, gas and impurities which greatly affect on-line data in the air are filtered out through the activated carbon block, normal combustion of the boiler is guaranteed, pollutant emission is reduced, and stability of the on-line data of the boiler is guaranteed; the whole structure is simple, use is convenient, production investment is greatly reduced, and the environment-friendly requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler gas emission control technical field especially relates to a kind of air intake control device of stable nitrogen oxide emission of gas-fired boiler. BACKGROUND

[0002] In the existing tungsten industry production enterprise, the gas environment in many process workshops will change with production, for example, in the pressure cooking workshop, alkaline gas will be generated in the production process, when natural gas and air are burned into gas-fired boiler, the outside wind direction and impurities in air will directly affect the content of nitrogen oxide in boiler combustion exhaust gas, so that the nitrogen oxide on-line data of boiler emission will produce greater fluctuation, since the environmental protection requirement is higher and higher at present, the content of nitrogen oxide in exhaust gas cannot be higher than 30㎎ / m³, therefore, it puts forward higher requirements to the stability and accuracy of nitrogen oxide of boiler emission. SUMMARY

[0003] The utility model discloses a kind of air intake control device of stable nitrogen oxide emission of gas-fired boiler, can filter the gas and impurities in air that affect on-line data more, guarantee emission compliance, to overcome the deficiency of prior art.

[0004] The utility model discloses the technical scheme that is adopted is as follows:

[0005] A kind of air intake control device of stable nitrogen oxide emission of gas-fired boiler, including electric air damper, transition flange, air duct and filter assembly;

[0006] The electric air damper is arranged at the air inlet of boiler induced draft fan, and the electric air damper is electrically connected with the boiler control system;The transition flange is a variable-diameter structure, and the large end is connected with the air inlet of electric air damper;The air duct is in the shape of a trumpet, and the small end of the air duct is connected with the transition flange small end;

[0007] The filter assembly is arranged on the large mouth end of air duct, and the filter assembly includes fixed net disc, support frame and activated carbon block, the fixed net disc is circular and matches the size of the large mouth end of air duct, the bottom of disc is steel wire mesh, the fixed net disc circumference is connected with the large mouth end of air duct by bolt, and the support frame is a plurality of longitudinal and transverse intersecting grid structures;The support frame is arranged in the fixed net disc;Activated carbon block is arranged in each grid of support frame respectively, and the activated carbon block is uniformly provided with air-permeable hole, and the direction of air-permeable hole is consistent with the direction of air duct.

[0008] Specifically, the lower part of the air duct is provided with supporting legs.

[0009] Specifically, the outer side of the fixed net disc is provided with a protective net to prevent the activated carbon block from falling.

[0010] Due to the adoption of the technical scheme as described above, the utility model has the following advantages:

[0011] The filter assembly and the structure of the trumpet-shaped air duct are arranged without affecting the air intake in the boiler, the gases and impurities which have greater influence on online data in the air are filtered by the activated carbon blocks, normal combustion of the boiler is ensured, pollutant emission is reduced, and the stability of online data of the boiler is ensured; the overall structure is simple, convenient to use, greatly reduces production investment, and meets environmental protection requirements. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is the overall view of the utility model.

[0013] Fig. 2 is the schematic view of the filter assembly of the utility model.

[0014] In the drawing: 1-electric air valve, 2-transition flange, 3-air duct, 4-filter assembly, 41-fixed net disc, 42-supporting frame, 43-activated carbon block. DETAILED DESCRIPTION

[0015] The utility model will be further explained and described below in combination with the drawings and examples, and the protection scope of the utility model cannot be limited by this, and the purpose of disclosing the utility model is to protect all technical improvements within the scope of the utility model.

[0016] In combination with the drawings Figs. 1-2 The utility model discloses a kind of stable nitrogen oxide emissions of gas-fired boiler air inlet control device, including electric air valve 1, transition flange 2, air duct 3 and filter assembly 4.

[0017] Electric air valve 1 is arranged at the air inlet of boiler induced draft fan, and electric air valve 1 is electrically connected with boiler control system;Transition flange 2 is variable diameter structure, and large end is connected with the air inlet of electric air valve 1;Air duct 3 is trumpet-shaped, and the small end of air duct 3 is connected with the small end of transition flange 2;Air duct 3 lower part is provided with supporting leg.

[0018] Filter assembly 4 is arranged on the large mouth end of air duct 3, and filter assembly 4 includes fixed net disc 41, supporting frame 42 and activated carbon block 43, fixed net disc 41 is circular and matches the size of the large mouth end of air duct 3, the bottom of disc is steel wire mesh, and the circumference of fixed net disc 41 is connected with the large mouth end of air duct 3 by bolt, and supporting frame 42 is a plurality of longitudinal and transverse intersecting grid structures;Supporting frame 42 is arranged in fixed net disc 41;Activated carbon block 43 is arranged in each grid of supporting frame 42 respectively, and gas-permeable hole is uniformly arranged on activated carbon block 43, and the direction of gas-permeable hole is consistent with the direction of air duct 3.

[0019] Preferably, the outer side of the fixed net disc 41 is provided with a protective net to prevent the activated carbon block 43 from falling off.

[0020] In use, the active carbon block 43 is placed in the grid of the support frame 42, the direction of the holes of the active carbon block 43 is consistent with the direction of the air duct 3, when the gas boiler is working, the electric air valve 1 adjusts the opening size according to the external control system in real time, under the action of the induced draft fan, the gas enters the air duct 3 after being filtered by the active carbon block 43, then the gas is mixed with natural gas through the electric air valve 1 and is combusted in the boiler, the gas is filtered by the active carbon block 43 to remove the gas and impurities in the air which have a greater influence on the online data, the normal combustion of the boiler is ensured, the pollutant emission is reduced, and the stability of the online data of the boiler is ensured.

[0021] The part not described in the utility model is the prior art.

[0022] In order to disclose the invention purpose of the utility model, the embodiments selected in the text are currently considered to be appropriate, however, it should be understood that the utility model aims to include all changes and improvements of the embodiments belonging to the scope of the concept and the utility model.

Claims

1. An air intake control device for stabilizing nitrogen oxide emissions from a gas-fired boiler, characterized by, It comprises an electric air valve, a transition flange, an air duct and a filter assembly. The electric air valve is arranged at an air inlet of a boiler induced draft fan and is electrically connected with a boiler control system; the transition flange is of a variable-diameter structure, and a large end is connected with an air inlet of the electric air valve; the air duct is of a horn shape, and a small end of the air duct is connected with a small end of the transition flange. The filter assembly is arranged at a large end of the air duct and comprises a fixed mesh disc, a support frame and activated carbon blocks; the fixed mesh disc is circular and matches the size of the large end of the air duct; a bottom of the fixed mesh disc is a steel mesh; the fixed mesh disc is connected with the large end of the air duct through bolts in a circumferential direction; the support frame is of a longitudinal and transverse interlaced grid structure; the support frame is arranged in the fixed mesh disc; the activated carbon blocks are arranged in the grids of the support frame respectively; and air-permeable holes are uniformly arranged on the activated carbon blocks and are in the same direction as the air duct.

2. The apparatus for controlling the intake air of a stable gas boiler nitrogen oxide emission according to claim 1, characterized in that: The air duct is provided with support legs at a lower part.

3. The apparatus for controlling intake air for stabilizing nitrogen oxide emissions of a gas-fired boiler according to claim 1, characterized by: The fixed mesh disc is provided with a protective mesh outside.

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