CN203240569U - Biomass fuel and natural gas mixed combustion system - Google Patents

Abstract

The utility model discloses a mixed combustion system of biomass fuel and natural gas with sufficient combustion, high heat utilization efficiency, reduced flue gas emission and good energy-saving effect. The utility model comprises a biomass fuel combustion chamber (1), a natural gas combustion chamber (2), a chain grate (3), a coal feeding device (4), a slag discharge device (5), an oxygen-enriched natural gas supply device (7), The biomass fuel combustion chamber (1) is provided with an air inlet (6), the chain grate (3) is located above the natural gas combustion chamber (2), and the natural gas combustion chamber (2) is located at the The top of the material fuel combustion chamber (1) is separated by the chain grate (3), the upper part of the natural gas combustion chamber (2) is provided with a flue outlet (10), and the oxygen-enriched natural gas supply device (7 ) is connected to the side wall of the natural gas combustion chamber (2) and supplies natural gas and oxygen-enriched air into the natural gas combustion chamber (2). The utility model can be widely used in the technical field of mixed combustion.

Description

Biomass fuel and natural gas mixed combustion system

technical field

The utility model relates to a biomass fuel and natural gas mixed combustion system.

Background technique

With fossil fuels such as petroleum, coal, and natural gas decreasing day by day, international and domestic energy sources are in short supply, the price of coal and other fuels has risen significantly, and fuel costs have risen rapidly. Under the influence of many factors, the government has vigorously promoted the transformation of the entire national industrial structure to an intensive economy, and biomass as a renewable energy has become a hot spot in the research of new energy in the 21st century. Biomass fuel has the advantages of low cost, simple operation, easy industrialization and application, etc., and has great development prospects.

Biomass fuel is currently a clean energy advocated by the state. Biomass fuel is favored by users because of its environmental protection, low price, stability and reliability. Due to different production raw materials, the calorific value of biomass fuel is unstable; due to the low density and light weight of biomass fuel, when the air enters the furnace for combustion, due to the large air velocity, it is easy to entrain the incompletely burned biomass fuel to form high-temperature flue gas Emissions are lost, resulting in waste of resources.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, and provide a mixed combustion system of biomass fuel and natural gas with sufficient combustion, high heat utilization efficiency, reduced flue gas emission, and good energy-saving effect.

The technical scheme adopted by the utility model is: the utility model includes a biomass fuel combustion chamber, a chain grate, a coal feeding device, and a slag discharge device, and the biomass fuel combustion chamber is provided with an air inlet, and the biomass fuel and The natural gas mixed combustion system also includes a natural gas combustion chamber and an oxygen-enriched natural gas supply device, the chain grate is located above the natural gas combustion chamber, and the natural gas combustion chamber is located above the biomass fuel combustion chamber and passes through the chain The grates are separated, the upper part of the natural gas combustion chamber is provided with a flue outlet, and the oxygen-enriched natural gas supply device is connected to the side wall of the natural gas combustion chamber and supplies natural gas and oxygen-enriched air into the natural gas combustion chamber.

The oxygen-enriched natural gas supply device includes a coaxial inner tube and an outer tube, the inner cavity of the inner tube is an oxygen-enriched air channel, and an annular cavity is formed between the outer tube and the inner tube, and the annular cavity is Natural gas access.

Both the inner pipe and the outer pipe at the end of the oxygen-enriched natural gas supply device are provided with gradual constrictions, and the cross-sectional areas of the oxygen-enriched air channel and the natural gas channel are gradually reduced.

There are several air inlets located at the bottom of the biomass fuel combustion chamber, and the air inlet is separated from the biomass fuel combustion chamber by the chain grate.

The biomass fuel and natural gas mixed combustion system also includes a natural gas pipeline, which is installed in the furnace between the end of the chain grate and the rear arch of the biomass fuel combustion chamber. for installation.

The coal feeding device includes a distributor.

The slagging device is located at the end of the chain grate.

The oxygen-enriched air is derived from the oxygen-enriched air produced by cold energy air separation provided by LNG gasification.

The beneficial effects of the utility model are: since the utility model includes a natural gas combustion chamber and an oxygen-enriched natural gas supply device, the chain grate is located above the natural gas combustion chamber, and the natural gas combustion chamber is located in the biomass fuel combustion chamber and separated by the chain grate, the upper part of the natural gas combustion chamber is provided with a flue outlet, the oxygen-enriched natural gas supply device is connected to the side wall of the natural gas combustion chamber and Supply natural gas and oxygen-enriched air; the utility model uses the natural gas combustion chamber to fully burn the unburned components in the biomass fuel flue gas and ash under the combustion support of natural gas and oxygen-enriched air, and further burn the biomass fuel The tail gas produced during primary combustion can fully burn the combustible components in the flue gas, fully burn the fuel, improve heat utilization efficiency, reduce flue gas emissions, and avoid energy waste and pollutant emissions. When biomass fuel When the calorific value is unstable, the stable output of the calorific value can also be maintained by adjusting the natural gas flow rate, which improves the work flexibility, so the utility model has sufficient combustion, high heat utilization efficiency, reduced flue gas emission, and good energy-saving effect;

Since the inner pipe and the outer pipe at the end of the oxygen-enriched natural gas supply device are provided with gradual constrictions, the cross-sectional areas of the oxygen-enriched air channel and the natural gas channel are gradually reduced, so this The utility model is more energy-saving and prolongs the service life of the air conditioner.

Description of drawings

Fig. 1 is the overall structural representation of the utility model embodiment;

Fig. 2 is a schematic diagram of the longitudinal section structure of the oxygen-enriched natural gas supply device of the utility model embodiment;

Fig. 3 is a schematic cross-sectional structure diagram of A-A shown in Fig. 2 .

Detailed ways

As shown in Figure 1, the embodiment of the utility model includes a biomass fuel combustion chamber 1, a natural gas combustion chamber 2, a chain grate 3, a coal feeding device 4, a slagging device 5, an oxygen-enriched natural gas supply device 7, and a natural gas pipeline 8 , the biomass fuel combustion chamber 1 is provided with an air inlet 6, the chain grate 3 is located above the natural gas combustion chamber 2, and the natural gas combustion chamber 2 is located above the biomass fuel combustion chamber 1 and Separated by the chain grate 3, the upper part of the natural gas combustion chamber 2 is provided with a flue outlet 10, and the oxygen-enriched natural gas supply device 7 is connected to the side wall of the natural gas combustion chamber 2 and supplies the natural gas Natural gas and oxygen-enriched air are supplied in the combustion chamber 2. In this embodiment, the oxygen-enriched air comes from the oxygen-enriched air produced by utilizing the cold energy air separation provided by LNG gasification, which can make the oxygen-enriched natural gas supply device 7 Both natural gas and oxygen-enriched air come from the product of LNG gasification, the source is the same and easy to control, the air inlet 6 has several and is located at the bottom of the biomass fuel combustion chamber 1, and the air inlet 6 passes through the chain The fire grate 3 is separated from the biomass fuel combustion chamber 1, the coal feeding device 4 includes a distributor, the slagging device 5 is located at the end of the chain fire grate 3, and the natural gas pipeline 8 is installed on the In the furnace between the end of the chain grate 3 and the rear arch 9 of the biomass fuel combustion chamber 1, both sides of the chain furnace are installed in pairs.

As shown in Figures 2 and 3, the oxygen-enriched natural gas supply device 7 includes a coaxial inner tube 71 and an outer tube 72, the inner cavity 70 of the inner tube 71 is an oxygen-enriched air channel, and the outer tube 72 and the An annular chamber 73 is formed between the inner pipes 71, and the annular chamber 73 is a natural gas channel. The inner pipe 71 and the outer pipe 72 at the end of the oxygen-enriched natural gas supply device 7 are provided with gradual shrinkage. The necking can start at 20cm from the end, the cross-sectional area of the oxygen-enriched air channel and the natural gas channel is gradually reduced, and the oxygen-enriched air channel is narrowed, which is easy to ensure the airflow velocity and adjust the flame length as required , The natural gas channel shrinks, which can promote the natural gas to cut the oxygen-enriched air flow, so that the two can be mixed evenly to achieve the purpose of full combustion.

The combustion process of the present utility model is as follows: the biomass fuel is input from the coal feeding device 4, falls on the chain grate 3 through the distributor, and the air passes through the fan (not shown in the figure) from the air inlet 6 enter the biomass fuel combustion chamber 1 through the chain grate 3 to assist the combustion of biomass fuel; the ash after the biomass fuel is burned is transported to the end of the chain grate 3 through the chain grate 3 The slagging device 5 is discharged; the underburned biomass fuel is entrained by the flue gas into the natural gas combustion chamber 2, and the natural gas and oxygen-enriched air are sent to the natural gas combustion chamber 2 through the oxygen-enriched natural gas supply device 7 The internal injection promotes oxygen-enriched combustion of combustible substances in the flue gas by adjusting the length of the flame; the combusted flue gas is discharged through the flue outlet 10 .

In the utility model, through the natural gas combustion chamber 2, the unburned components in the biomass fuel flue gas and ash are fully burned for the second time under the combustion support of natural gas and oxygen-enriched air, and the tail gas generated during the primary combustion of the biomass fuel is further burned. , can fully burn the combustible components in the flue gas, fully burn the fuel, improve the heat utilization efficiency, reduce the emission of flue gas, and avoid the waste of energy and the emission of pollutants. When the calorific value of biomass fuel is unstable, It can also maintain the stable output of calorific value by adjusting the flow of natural gas, which improves the working flexibility. Therefore, the combustion system of the utility model can fully burn biomass fuel, have high heat utilization efficiency, reduce flue gas emission, and have good energy-saving effect.

The utility model can be widely used in the technical field of mixed combustion.

Claims (8)

1. A biomass fuel and natural gas mixed combustion system, comprising a biomass fuel combustion chamber (1), a chain grate (3), a coal feeding device (4), a slagging device (5), and the biomass fuel combustion The chamber (1) is provided with an air inlet (6), and it is characterized in that: the biomass fuel and natural gas mixed combustion system also includes a natural gas combustion chamber (2), an oxygen-enriched natural gas supply device (7), and the chain grate ( 3) Located above the natural gas combustion chamber (2), the natural gas combustion chamber (2) is located above the biomass fuel combustion chamber (1) and separated by the chain grate (3), the The top of the natural gas combustion chamber (2) is provided with a flue outlet (10), and the oxygen-enriched natural gas supply device (7) is connected to the side wall of the natural gas combustion chamber (2) and is connected to the natural gas combustion chamber (2). ) to supply natural gas and oxygen-enriched air. 2. The biomass fuel and natural gas mixed combustion system according to claim 1, characterized in that: the oxygen-enriched natural gas supply device (7) includes a coaxial inner tube (71) and an outer tube (72), the The inner cavity (70) of the inner pipe (71) is an oxygen-enriched air channel, and an annular cavity (73) is formed between the outer tube (72) and the inner tube (71), and the annular cavity (73) is natural gas aisle. 3. The mixed combustion system of biomass fuel and natural gas according to claim 2, characterized in that: the inner pipe (71) and the outer pipe (72) at the end of the oxygen-enriched natural gas supply device (7) ) are provided with gradual shrinkage, and the cross-sectional area of the oxygen-enriched air channel and the natural gas channel is gradually reduced. 4. The mixed combustion system of biomass fuel and natural gas according to claim 1, characterized in that: there are several air inlets (6) located at the bottom of the biomass fuel combustion chamber (1), and the inlet The tuyere (6) is separated from the biomass fuel combustion chamber (1) by the chain grate (3). 5. The biomass fuel and natural gas mixed combustion system according to claim 1, characterized in that: the biomass fuel and natural gas mixed combustion system also includes a natural gas pipeline (8), and the natural gas pipeline (8) is installed in the In the furnace between the end of the chain grate (3) and the rear arch (9) of the biomass fuel combustion chamber (1), the two sides of the chain furnace are installed in pairs. 6. The mixed combustion system of biomass fuel and natural gas according to claim 1, characterized in that: the coal feeding device (4) includes a distributor. 7. The mixed combustion system of biomass fuel and natural gas according to claim 1, characterized in that: the slagging device (5) is located at the end of the chain grate (3). 8. The mixed combustion system of biomass fuel and natural gas according to claim 1, characterized in that: the oxygen-enriched air is derived from the oxygen-enriched air produced by cold energy air separation provided by LNG gasification.

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