CN105542861A

CN105542861A - Production method of biomass combustible gas with high calorific value

Info

Publication number: CN105542861A
Application number: CN201610011115.XA
Authority: CN
Inventors: 张勇; 许庆华
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-01-10
Filing date: 2016-01-10
Publication date: 2016-05-04

Abstract

The invention discloses a production method of biomass combustible gas with the high calorific value. According to the technical scheme, the method is mainly characterized in that on the basis that air is utilized as a biomass pyrolysis gasifying agent, and an oxygen adding device which can be matched with gas capacity and is controllable is externally connected, so that the concentration of the oxygen component in air is increased by increasing the oxygen amount, oxygen-enriched gas is obtained, thus the reaction temperature of a fixed bed pyrolyzing furnace can be raised, the gasification reaction velocity is increased, precipitation of moisture and volatile components in a material center is accelerated, the content of H2 is increased, it is helpful to produce more CO, and tar is pushed to crack to generate micromolecule gas, so that the targets of raising the gas production rate, improving gas quality and raising the calorific value of the combustible gas can be achieved. The method is helpful to raise the calorific value of the combustible gas, crack the tar, improve cleanliness of the combustible gas, reduce adhesion and blocking of the tar in conveying pipes and associated equipment and guarantee normal running of equipment devices. The production method of the biomass combustible gas with the high calorific value is applicable to a biomass combustible gas production line and such projects as power generation and heat supply.

Description

The production method of the high-valued combustion gas of biomass

Technical field

The present invention relates to biomass gasification technology field, be specifically related to the production method of the high-valued combustion gas of a kind of biomass.

Background technology

The Energy resources that agricultural-forestry biomass is exactly always the production of the mankind, life, existence rely on.To today of 21 century, when disposable fossil energy quantity is fewer and feweri, harm environment is more and more serious time, each state all successively science and technology and economic force, puts in biomass energy development and utilization.

China is biomass output big country of the world, and having agricultural-forestry biomass total amount about has more than 900,000,000 ton.The dual-pressure short in the face of national energy and environmental pollution is serious, biomass energyization utilizes as national energy development strategy by China.

Biomass gasification technology is one of important way of biomass economy.It utilizes thermochemical conversion technology, by biomass lower for thermo-efficiency, is converted into the inflammable gas that thermo-efficiency is higher.Present commonplace application gasification technology, has the methods such as air gasification, oxygen-rich gasification, steam gasification.

Employing utilizes air as gasifying medium, produces combustible gas, thisly utilizes technology, have economy and convenience.But owing to containing a large amount of N2 in air, so the calorific value of the gasification efficiency of biomass and gasification burning all very low (4-6kj/m3), and tar content is higher, causes equipment to block, affects continuous prodution and run.

Adopt water vapour to produce combustible gas, the technology of this utilization, can increase the H2 composition in combustion gas, the combustible gas that output calorific value is higher.But cost of investment is higher, it is more difficult to realize mass-producing continuous prodution, impact extensively utilizes.

Take membrane sepn oxygen generation method to produce combustible gas, this concentration utilizing technology also can increase oxygen, reduce the content of N2, improve the gasification efficiency of biomass and the calorific value of unit volume output gas.But the membrane filtration oxygen method required for this method is invested greatly, it is high to consume energy, cost is high, is unfavorable for that industry extensively utilizes.

Although the technology of oxygen gasification and steam gasification is a kind of special method effectively improving again fuel gases calorific value, significantly can not reduces investment and running cost, therefore promote not easily.

Summary of the invention

Object of the present invention, is overcome weak point in the technology such as existing air gasification method, steam gasification method, membrane sepn oxygen generation method, provides the production method of the high-valued combustion gas of a kind of biomass.

The production method of the high-valued combustion gas of biomass, on the basis utilizing air as biomass pyrogenation gasification agent, external one matches with combustion gas production capacity, controllable oxygen adding apparatus, by strengthening amount of oxygen, increase oxygen components concentration in air, obtain oxygen rich air gas, raise the temperature of reaction of fixed-bed pyrolysis stove, accelerate the speed of gasification reaction, thus be conducive to the precipitation accelerating material center moisture and volatile matter, enter you and increase H2 content in combustion gas, be conducive to CO2 reduction, obtained more CO and promotion tar generation cracking generate micro-molecular gas, to reach raising factor of created gase, improve gaseous mass, promote the target of fuel gases calorific value.

The present invention is achieved by following technical proposals:

1, the production method of the high-valued combustion gas of a kind of biomass: (1) biomass molding fuel is added in fixed-bed pyrolysis stove from opening for feed, point biomass shaping fuel-combustion, start roots blower, after bed pyrolysis oven normal operation to be fixed, first open oxygen generator valve, open Oxygen control valve and air inlet valve again, regulate Oxygen control valve, progressively increase the oxygen concentration in air, to make in air oxygen level by 20.9%, bring up to 25-45%, make oxygen rich gas.

(2) under the effect of roots blower, oxygen rich gas is heated by preheater, and the biomass molding fuel layer being transported to fixed-bed pyrolysis stove is inner.

(3), according to the combustion heat value at fixed-bed pyrolysis stove scene, regulate Oxygen control valve, make the pyrolysis temperature of fixed-bed pyrolysis stove control at 1050 ~ 1150 DEG C, to produce the high heating value combustion gas of 8000 ~ 12000kj/m3.

(4) under the guiding of roots blower, high heating value fuel gas flow is discharged from air outlet, and the purification system of input biological fuel gas carries out purifying treatment, and the waste residue after biomass molding fuel burning is discharged from slag notch.

The production method of the high-valued combustion gas of biomass is that one can increase oxygen concentration in air, obtains oxygen rich gas, improves biomass briquette gasification efficiency, obtains the method for high heating value combustible gas.

The production method of the high-valued combustion gas of biomass, fully applies the device condition of existing Biomass Air Gasification, has played ripe oxygenerating technology advantage, has saved oxygen cost and initial cost.

The production method of the high-valued combustion gas of biomass, fully apply the principles of chemistry of biomass high temperature pyrolysis and gasification, accelerate high temperature pyrolysis and gasification reaction, accelerate CO2 reduction, obtained more CO, promote the precipitation of material center moisture and volatile matter, increase H2 generating capacity, be conducive to improving fuel gases calorific value, gasification efficiency, guarantee that fixed-bed pyrolysis stove consumes the production capacity of biomass molding fuel amount, can the fire box temperature of about 1100 DEG C required for the pyrolysis of stabilate matter, ensure the operating mode of continuous service.

The production method of the high-valued combustion gas of biomass, utilize the high temperature of burner hearth, and effective cracking biomass coke tar becomes small molecules, contributes to improving fuel gases calorific value, also improve combustion gas cleanliness factor, decreases tar in the adhesion of transport pipe and relevant device and blocking.

The production method of the high-valued combustion gas of biomass, is applicable to biological mass combustable gas production line project, and the high heating value combustion gas of generation can be used for generating and heat supply.

Accompanying drawing explanation

Fig. 1 is the high-valued combustion gas process flow diagrams of biomass.

As shown in the figure: 1 is oxygen generator, 2 is Oxygen control valves, and 3 is air inlet valve, and 4 is preheaters, and 5 is fixed-bed pyrolysis stoves, and 6 is opening for feeds, and 7 is slag notches, and 8 is air outlets, and 9 is purification systems of biological fuel gas, and 10 is roots blowers.

Embodiment

Below in conjunction with embodiment, the invention will be further described:

1, the production method of the high-valued combustion gas of a kind of biomass: (1) biomass molding fuel is added in fixed-bed pyrolysis stove 5 from opening for feed 6, point biomass shaping fuel-combustion, start roots blower 10, after bed pyrolysis oven 6 normal operation to be fixed, first open oxygen generator valve 1, open Oxygen control valve 2 and air inlet valve 3 again, regulate Oxygen control valve 2, progressively increase the oxygen concentration in air, to make in air oxygen level by 20.9%, bring up to 25-45%, make oxygen rich gas.

(2) under the effect of roots blower 10, oxygen rich gas is heated by preheater 4, and the biomass molding fuel layer being transported to fixed-bed pyrolysis stove 5 is inner.

(3), according to the combustion heat value at fixed-bed pyrolysis stove 5 scene, regulate Oxygen control valve 3, the pyrolysis temperature of fixed-bed pyrolysis stove 5 controls at 1050 ~ 1150 DEG C, to produce the high heating value combustion gas of 8000 ~ 12000kj/m3.

(4) under the guiding of roots blower 10, high heating value fuel gas flow is discharged from air outlet 8, and the purification system 9 of input biological fuel gas carries out purifying treatment, and the waste residue after biomass molding fuel burning is discharged from slag notch 7.

Claims

1. a production method for the high-valued combustion gas of biomass, is characterized in that:

(1) biomass molding fuel is added in fixed-bed pyrolysis stove from opening for feed, point biomass shaping fuel-combustion, start roots blower, after bed pyrolysis oven normal operation to be fixed, first open oxygen generator valve, open Oxygen control valve and air inlet valve again, regulate Oxygen control valve, progressively increase the oxygen concentration in air, to make in air oxygen level by 20.9%, bring up to 25-45%, make oxygen rich gas;

(2) under the effect of roots blower, oxygen rich gas is heated by preheater, and the biomass molding fuel layer being transported to fixed-bed pyrolysis stove is inner;

(3), according to the combustion heat value at fixed-bed pyrolysis stove scene, regulate Oxygen control valve, make the pyrolysis temperature of fixed-bed pyrolysis stove control at 1050 ~ 1150 DEG C, to produce the high heating value combustion gas of 8000 ~ 12000kj/m3;