CN1323871A - Plant straw gas producing process and its gas generator - Google Patents
Plant straw gas producing process and its gas generator Download PDFInfo
- Publication number
- CN1323871A CN1323871A CN00115739A CN00115739A CN1323871A CN 1323871 A CN1323871 A CN 1323871A CN 00115739 A CN00115739 A CN 00115739A CN 00115739 A CN00115739 A CN 00115739A CN 1323871 A CN1323871 A CN 1323871A
- Authority
- CN
- China
- Prior art keywords
- coal
- gas
- furnace
- producer
- biomass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Landscapes
- Processing Of Solid Wastes (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
A method for producing coal gas using plant straw as raw material is disclosed, that is the heat generated from burning coal and cracking of plant straw to produce gas are carried out in the same generator. Programming control method is used to make the heat accumulating process and cracking reaction to carry out according to the designed program. Compared with prior art process for using strow to produce gas, the invented equipment investment can save more than one third.
Description
The invention relates to a method and a device for preparing coal gas, in particular to a method and a device for preparing high-calorific-value coal gas by coal and biomass straws in the same furnace, belonging to the field of agricultural resource recycling.
The annual output of crops straws in China is more than 5.7 hundred million tons, which is about 3 hundred million tons of standard coal, so that the straws are a huge energy reserve, the current state is that most of the crop straws cannot be reasonably utilized, and a great amount of straws are burned in rural areas all the time, so that precious energy is wasted, and the environment is seriously polluted. The development of the technology for producing gas by using crop straws is a requirement for fully utilizing the existing energy, enhancing the environmental protection and promoting the ecological balance, and is a requirement for the economic sustainable development of China.
The existing biomass straw cracking gas making technology adopts an indirect heating type gas making scheme, and the basic method is that crushed biomass straws are spirally propelled in a heat-resistant stainless steel tube, a coal heating pipeline is used outside the tube, heat energy generated by coal combustion is used for heating and cracking the biomass straws in the tube through conduction and convection heat exchange, and the heat value of the produced coal gas is higher.
Chinese patent 'straw gas producer' (ZL96209603.2) discloses a technology for continuously producing gas from straw, which adopts single raw material to produce gas, the heat energy required by straw gasification is supplied by straw self-burning heat release in a gasification furnace, the gasification mechanism is that the straw is incompletely burned under an anoxic state to produce CO and H2Is a predominantly combustible gas. Because the heat value of the straw is low (about 2500-3000 multiplied by 4.18KJ/Kg), the air in the gasifying agent contains a large amount of non-combustible nitrogen and all the nitrogen is transferred into the coal gas, the heat value of the produced coal gas is low, and the investment of a pipe network and a gas storage system is large, thereby greatly limiting the use function of the coal gas.
The invention aims to overcome the defects of the existing biomass straw gas-making technology and provides a novel biomass straw cracking gas-making method.
According to the cracking gasification system, the heat source required by gasification and cracking is obtained by combustion and heat release of coal, so that the reaction temperature in the furnace is increased, the reaction level in the furnace is stabilized, the heat energy required by cracking the biomass straws adopts a direct-heating heat exchange mode, so that the biomass straws and the high-temperature coal are subjected to full heat exchange in the furnace, and the gasification mode is evolved from a simple redox reaction into an air-isolated stateThe produced gas comprises CO and H2Become CH for leading role4、C2H4The heat value of the gas can be improved to 3500 x 4.18KJ/m by taking hydrocarbon gases such as low carbon chain hydrocarbon as main gases3The above.
The technical solution of the invention is as follows:
the method for preparing coal gas is characterized by that the heat release of coal combustion and high-temp cracking of biomass straw to prepare gas are implemented in the same producer. In the process of gas making, firstly, air is blown in from an air blower outside the furnace to enter the upper space of the furnace and generate oxidation reduction reaction with the hot coal, so that the environment temperature of the upper air layer of the furnace reaches more than 600 ℃, the temperature of a coal oxidation layer reaches 900-2、N2The flue gas which is the main flue gas is exhausted out of the furnace from a coal gas outlet at the lower part of the furnace under the suction action of a coal gas exhausting machine outside the furnace; at the moment, stopping blowing, continuously adding biomass straws through a feeding device, enabling the biomass straws to be directly contacted with high-temperature coal in an air isolation state, absorbing heat generated by heat conduction, heat radiation and heat convection of a hollow layer and a material layer, generating biomass cracking coal gas, and discharging the biomass cracking coal gas out of the furnace from a coal gas outlet at the lower part of the furnace through the suction effect of a coal gas discharge machine.
The representative formula of the above reaction can be expressed by the following equation:
in the formula: + Q is exothermic; q is endothermic
The coal to be fired is anthracite, bituminous coal, lean coal lump coal or molded coal, and the biomass straw to be fired is crushed material with the length of 0-30mm after crushing processing; the coal gas discharge machine can be a Roots blower, a high-pressure centrifugal blower, an induced draft fan, an exhaust fan or a vacuum pump.
The gas making scheme adopts control elements such as a microcomputer, an electromagnetic valve combination, a time relay and the like, a driving mechanism is a hydraulic valve, an air pressure valve or an electric valve, and the heat release of coal combustion and the intermittent alternate gas making by cracking the biomass straws are carried out according to a set program.
The established program of the scheme sequentially comprises the following steps: a. blowing coal for heat storage; b. exhausting flue gas; c. cracking biomass straws to prepare gas; d. and (5) recovering residual gas. The four stages form a cycle period, the time of one cycle period is 8-30 minutes, wherein the percentage time of the stage a is 15-40%, the percentage time of the stage c is 60-85%, and the percentage time of the stages b and c is 1-2% respectively.
A gas producer special for the gas production method comprises a feeding device, a producer body and an ash tray ash discharging mechanism. Wherein the coal feeding device and the biomass straw feeding device are arranged on the upper part of the furnace body and are respectively isolated from the outside air by a sealing cone and a sealing cover arranged on the corresponding devices; the circumference of the inner side of the whole furnace wall at the upper space of the furnace body is coated with refractory materials; the middle lower part of the furnace body is provided with a water jacket; the residues of the coal-fired furnace slag and the cracked biomass straws are discharged out of the furnace by an ash tray slag discharging mechanism at the lower part of the furnace, and the coal gas and the flue gas are discharged out of the furnace by a coal gas outlet at the lower part of the furnace.
The technical solution is further described below with reference to fig. 1 and 2.
In the drawings:
1. air blower 2, biomass straw feeding device 3 and gas producer
4. Dust collector 5, cooling purification device 6, coal gas discharging machine
7. Emptying valve 8, gas valve 9 and air valve
10. Motor 11, biomass straw hopper 12 and biomass straw hopper sealing cover
13. Coal distributing cone 14, coal feeding device 15 and refractory material
16. Explosion-proof device 17, air inlet 18 and water jacket
19. Ash tray slag discharging mechanism 20, gas outlet 21, distributing cone
(1) And blowing coal for heat storage and exhausting flue gas.
Opening a coal distributing cone 13 in a coal feeding device 14, feeding coal into a coal gas producer 3 from an upper coal feeding device 14 through a distributing cone 21, starting an air blower 1, a coal gas discharge machine 6, an air valve 9 and an emptying valve 7, feeding air into an upper space of the coal gas producer 3 from an air inlet 17 of the upper space of the coal gas producer, carrying out oxidation-reduction reaction on the air and the hot coal in the coal gas producer and residual carbide after the cracking of the biomass straws in the previous cycle period, and generating a large amount of CO2The gas and a small amount of CO gas form flue gas and release a large amount of heat, the heat is accumulated in a coal layer, the produced flue gas is discharged into a system from a coal gas outlet 20 at the middle lower part of the producer 3 through the suction action of a coal gas discharge machine 6, enters a dust removal device 4, a cooling and purifying device 5, and the flue gas after dust removal, cooling and purification is pressurized and conveyed by the coal gas discharge machine 6 and is discharged into the atmosphere from an emptying valve 7. After a certain period, according to a set program, the air valve 9 is closed, and residual flue gas in the furnace and the system is discharged to the atmosphereaccording to the running route.
(2) Cracking the straw to prepare gas and recovering the residual gas.
The motor 10 connected with the straw feeding device 2 is started, the gas valve 8 is started, the crushed biomass straws uniformly and continuously enter the upper part of the gas producer 3 and directly contact with the hot coal layer, the heat storage of the coal and the refractory material 15 at the inner periphery of the upper hollow layer of the producer is received through conduction, radiation and convection heat transfer, the heat storage rapidly rises to the temperature required by the gasification and the cracking of the organic matter of the biomass straws, and the organic matter is rapidly gasified and cracked, wherein the gasified organic matter which is not cracked is contacted with the high temperature material layer in the producer from top to bottom under the suction action of the gas discharge machine 6 and is continuously cracked. The cracking product of biomass straw organic matter is mainly CH4、C2H4When the organic hydrocarbons have high heat productivity, the produced gas is discharged into the system from the gas outlet 20 at the middle lower part of the gas generating furnace 3 through the pumping action of the gas discharging and conveying machine 6The flue gas enters a dust removal device 4 and a cooling purification device 5, and the flue gas after dust removal, cooling and purification is pressure-fed by a gas discharge machine 6 and discharged into a gas system or a gas cabinet through a gas valve 8. After a certain period, the biomass straw feeding motor 10 is closed according to a set program, and residual gas in the furnace and in the system is discharged to a gas system or a gas cabinet according to the running route.
(3) In the operation process of each stage, the main auxiliary equipment used comprises a dustremoval device 4, a cooling and purifying device 5, an air blower 1, a gas discharge machine 6, various valves and the like, and various ready-made equipment which is matched with the system and has mature market application is adopted.
(4) The cycle period of each stage is 8-30 minutes, wherein the blast coal heat storage stage accounts for 15-40%, the flue gas exhaust stage accounts for 1-2%, the biomass straw cracking gas production stage accounts for 60-85%, the residual gas recovery stage accounts for 1-2%, the cycle time and the setting and adjustment of time distribution of each stage are determined according to the raw material condition, the personnel operation condition, the system scale and other factors, and the automatic control is realized by a microcomputer, an electromagnetic valve combination, a time relay and other control elements, an electric, hydraulic, pneumatic valve and other execution mechanisms.
(5) A gas producer device special for the gas making method comprises accessories such as a gas producer 3, a biomass straw feeding device 2, a biomass straw hopper 11, a coal feeding device 14, an ash tray slag discharging mechanism 15 and the like, and is characterized in that the coal feeding device 14 and the biomass straw feeding device 2 are arranged on the upper part of the gas producer 3 and are respectively isolated from the outside air by a coal distributing cone 13 and a biomass straw hopper sealing cover 12 arranged on corresponding devices; the entire inner circumference of the furnace wall at the upper space of the producer 3 is coated with a refractory material 15 to prevent heat energy loss; the middle lower part of the furnace body is provided with a water jacket for preventing high-temperature slagging and wall hanging of coal; the coal gas and the flue gas are discharged out of the furnace through a coal gas outlet 20 arranged at the lower part of the furnace; the ash generated by the combustion of coal and thecombustion of the residual carbonized substance of the biomass straws in each gas making stage is discharged out of the furnace through an ash tray slag discharging mechanism 19 at the lower part of the furnace; the inside and outside sealing of the furnace in the stages of gas preparation by biomass straw cracking and residual gas recovery is ensured by the mechanical contact type sealing of the coal distributing cone 13 and the coal feeding device and the padding filling between the biomass straw hopper and the sealing cover of the biomass straw hopper; in order to ensure the safe operation of the system, the side wall of the upper cavity layer of the gas producer 3 is symmetrically provided with 2 pieces of anti-explosion plates.
Compared with the prior technical scheme for preparing gas by various biomass straws, the invention has the following advantages:
(1) the coal and the biomass straw are subjected to direct-heating heat exchange in the same furnace, so that the heat transfer efficiency is high; residual carbonized substances (accounting for about 15-20% of the added amount of the straws) left after the biomass straws are cracked are combusted to release heat, and heat energy is accumulated in a material layer, so that the energy utilization rate is high.
(2) Coal, as an auxiliary raw material (the consumption of which accounts for about 30% of the total energy consumption), participates in the combustion reaction in the furnace, and has the following unique important functions besides providing a heat source for the cracking of biomass straws:
the coal layer and the ash slag layer in the coal gas producer are excellent renewable filters, the tar discharge which is not cracked is absorbed in the biomass straw cracking stage, and the tar discharge and the residual carbonized substancesof the biomass straw can be synchronously combusted along with the combustion of coal to release heat in the blast coal heat storage stage, so that the energy is saved, the self purification is realized, and the subsequent treatment equipment is greatly simplified.
(3) The invention adopts coal combustion as the heat source for cracking the biomass straws, and because the temperature required by cracking is lower (350-850 ℃), the temperature in the furnace is lower than the temperature of the traditional single coal gas making furnace by 150-200 ℃, the quality requirements (such as heating value and ash melting point) on the coal are not high, and the inferior coal can be utilized. Because coal and biomass straws are cheap resources, the operation cost is low, and the biomass straw is completely acceptable to industrial and civil users.
(4) Lime added into briquette containing CaCO3The components are more than 50 percent, and the harmful components-organic sulfur and H in the smoke and the coal gas can be effectively removed2S, and the like, and the removal rate can reach more than 80 percent.
(5) The produced straw cracked gas is made up by using organic hydrocarbon combustible material, and the heat value of coal gas can be up to 3500X 4.18KJ/m3The above.
In conclusion, the invention has important practical significance for recycling crop straws in vast rural areas in China and biomass wastes in urban and rural areas in China, saving energy, protecting ecological environment and improving the life quality of people in the vast rural areas accounting for more than 75% of the population in China.
Claims (8)
1. A method for preparing coal gas from biomass straw is characterized in that heat release of coal fuel and cracking of biomass straw to prepare gas are carried out in the same generating furnace, coal and biomass straw entering the furnace respectively enter the furnace from the upper part of the furnace, an air blower arranged outside the furnace blows air into the upper space of the furnace, the biomass straw and the hot coal undergo oxidation reaction to release heat and accumulate the heat in a material layer, the biomass straw is directly contacted with high-temperature coal in an air-isolated state, the material layer absorbs heat through heat conduction, convection and radiation to generate cracking reaction to generate high-heat-value coal gas, and the generated coal gas is discharged out of the furnace from the lower part of the furnace through the suction effect of a coal gas discharging machine outside the furnace.
2. The gas making method according to claim 1, wherein the coal is anthracite, bituminous coal, lean coal lump coal or molded coal, and the biomass straw is various crop straws or biomass wastes such as crushed corn stalks, rice straws, cotton stalks, wheat straws, rape stalks, rice hulls, bamboo and wood particles, leaves, vegetable leaves, green grass and the like with the length of 0-30 mm.
3. The gas-generating method as claimed in claim 1, wherein the heat release of coal combustion and the intermittent gasification of biomass straw cracking are alternately performed according to a certain cycle period and a predetermined program by using control elements such as a microcomputer, a time relay, a solenoid valve combination and the like and valve driving devices such as hydraulic pressure, air pressure or electric power and the like.
4. The gas-making method according to claim 1 and 3, characterized in that a cycle period is 8-30 minutes, wherein the blastcoal heat-storage stage accounts for 15-40%, the biomass straw cracking gas-making stage accounts for 60-85%, and the flue gas exhaust and residual gas recovery stages each account for 1-2%.
5. The method of claim 1, wherein the flue gas generated by coal combustion is the same as the produced coal gas, and the flue gas is discharged after dust removal, cooling and purification to remove impurities such as dust and tar in the gas.
6. The gas producing method as claimed in claim 1, wherein the gas exhausting machine outside the furnace is a roots blower, a high pressure centrifugal blower, a suction fan, an induced draft fan, or a vacuum pump.
7. The method for producing gas as claimed in claim 1 and 2, wherein when the coal to be fired is formed coal, 5-15% lime is added into the formed coal.
8. The special gas producer designed according to the gas making method of claim 1, which comprises a feeding device, a producer body and an ash tray ash discharging mechanism, and is characterized in that the coal feeding device and the biomass straw feeding device are arranged at the upper part of the producer body and are isolated from the outside air by a coal distributing cone and a biomass straw hopper sealing cover which are arranged on the corresponding devices respectively, the inner circumference of the whole inner side of the producer wall at the upper space of the producer body is coated with refractory materials, the middle lower part of the producer body is provided with a water jacket, coal gas and smoke are discharged from a coal gas outlet arranged at the lower part of the producer, coal furnace slag and biomass residues after combustion cracking are discharged out ofthe producer by the ash tray slag discharging mechanism at the lower part of the producer, and the side wall of the upper space of the producer of the gas producer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001157396A CN1136290C (en) | 2000-05-17 | 2000-05-17 | Plant straw gas producing process and its gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001157396A CN1136290C (en) | 2000-05-17 | 2000-05-17 | Plant straw gas producing process and its gas generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1323871A true CN1323871A (en) | 2001-11-28 |
| CN1136290C CN1136290C (en) | 2004-01-28 |
Family
ID=4585183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001157396A Expired - Fee Related CN1136290C (en) | 2000-05-17 | 2000-05-17 | Plant straw gas producing process and its gas generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1136290C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966627B (en) * | 2006-08-04 | 2010-05-26 | 张家彪 | Method for producing methane-like liquid gas by plant carbonization |
| CN101643656B (en) * | 2009-08-20 | 2013-02-27 | 韩大海 | Coke making method by adding biomass energy to mixed coal |
| CN103396823A (en) * | 2013-08-12 | 2013-11-20 | 青岛理工大学 | Device and method for preparing biomass oil by using waste heat of granulated blast furnace slag |
| CN104342177A (en) * | 2014-09-18 | 2015-02-11 | 苏州新协力环保科技有限公司 | Carbonizing furnace with biomass particles |
| CN105779006A (en) * | 2016-04-29 | 2016-07-20 | 湖北瑞森克环保能源有限公司 | Pyrolytic gasification and combustion apparatus |
| CN106047416A (en) * | 2016-03-11 | 2016-10-26 | 郭宾 | Multifunctional gasifier and combined-cycle energy system |
| CN111117673A (en) * | 2020-01-17 | 2020-05-08 | 郑州美俊机械设备有限公司 | Supply and storage device for charcoal fuel |
-
2000
- 2000-05-17 CN CNB001157396A patent/CN1136290C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966627B (en) * | 2006-08-04 | 2010-05-26 | 张家彪 | Method for producing methane-like liquid gas by plant carbonization |
| CN101643656B (en) * | 2009-08-20 | 2013-02-27 | 韩大海 | Coke making method by adding biomass energy to mixed coal |
| CN103396823A (en) * | 2013-08-12 | 2013-11-20 | 青岛理工大学 | Device and method for preparing biomass oil by using waste heat of granulated blast furnace slag |
| CN103396823B (en) * | 2013-08-12 | 2015-06-17 | 青岛理工大学 | Method for preparing biomass oil by using waste heat of granulated blast furnace slag |
| CN104342177A (en) * | 2014-09-18 | 2015-02-11 | 苏州新协力环保科技有限公司 | Carbonizing furnace with biomass particles |
| CN106047416A (en) * | 2016-03-11 | 2016-10-26 | 郭宾 | Multifunctional gasifier and combined-cycle energy system |
| CN105779006A (en) * | 2016-04-29 | 2016-07-20 | 湖北瑞森克环保能源有限公司 | Pyrolytic gasification and combustion apparatus |
| CN111117673A (en) * | 2020-01-17 | 2020-05-08 | 郑州美俊机械设备有限公司 | Supply and storage device for charcoal fuel |
| CN111117673B (en) * | 2020-01-17 | 2020-12-18 | 浙江中法农业科技发展有限公司 | Supply and storage device for charcoal fuel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1136290C (en) | 2004-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101817012B (en) | Gasification treatment device for household refuse | |
| CN203791331U (en) | System for synergistic treatment of municipal domestic waste in cement kiln | |
| CN104804775A (en) | Method and system for producing combustible gas from domestic waste through pyrolysis gasification | |
| CN106224036A (en) | The refuse gasification combustion gas of a kind of multi-stage heat exchanger and steam turbine combined generating system | |
| CN101508902A (en) | Biomass fuel cycle gasifying device and method thereof | |
| CN106224972A (en) | The refuse gasification combustion gas of high-moisture gas recycling and steam turbine combined generating system | |
| CN101962558B (en) | Biomass combustible gas high-temperature oxygen-free reinforced dry-distillation pyrolysis plant | |
| CN105465793B (en) | Double-deck stoker fired grate formula refuse gasification burns double boiler electricity generation system | |
| CN1136290C (en) | Plant straw gas producing process and its gas generator | |
| CN204607940U (en) | The system of combustible gas is produced in domestic garbage pyrolysis gasification | |
| CN203669943U (en) | Energy-saving power generation device by using solid wastes | |
| CN102329654B (en) | Biomass gasification device and process | |
| CN105351019A (en) | Power generation technique based on pyrolyzation and gasification of refuse derived fuel (RDF) prepared from household refuse and incineration of fuel gas | |
| CN106122977A (en) | CO2 recovery system based on refuse gasification combustion gas and steam turbine cogeneration | |
| CN205560766U (en) | Double -deck mechanical stoker formula waste gasification incineration boiler system | |
| CN101974351B (en) | Scale fixed bed biomass gasification power generation production technology and suite of equipment | |
| CN106224035A (en) | The humid air turbine electricity generation system reclaimed based on refuse gasification synthesis gas | |
| CN207756595U (en) | A kind of electricity generation system of debirs clean utilization | |
| CN106287642A (en) | Combustion gas based on refuse gasification and the coaxial combined generating system of steam turbine | |
| CN105402738A (en) | Dual-layer mechanical grate type garbage gasifying incinerator and dual-boiler system thereof | |
| CN105509060A (en) | Mechanical grate type waste gasifying incinerator and boiler power generation system thereof | |
| CN105465792A (en) | Circulating air supply system of mechanical fire gate type waste gasification incinerator | |
| CN205560762U (en) | Mechanical stoker formula waste gasification incineration boiler system | |
| CN205560764U (en) | Mechanical stoker formula waste gasification burns dual -boiler system | |
| CN205560759U (en) | Mechanical stoker formula waste gasification burns dual -boiler power generation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |