CN108410722B

CN108410722B - Biogas generation device, coal straw gasification device and control method

Info

Publication number: CN108410722B
Application number: CN201810227694.0A
Authority: CN
Inventors: 张英华
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-03-06
Filing date: 2018-03-06
Publication date: 2021-04-06
Anticipated expiration: 2038-03-06
Also published as: CN108410722A

Abstract

The invention discloses a methane generating device, a coal straw gasification device and a control method. The methane generating device mainly comprises a methane tank, a rotary methane generator, a front isolation wall, a spiral slurry pumping machine, a rear isolation wall, a motor, a driving conical gear, a driven conical gear, a spiral feeder, a sealing clamp, a slurry pump or a spiral slurry pumping machine, a centrifugal spin dryer and a heating pipe. The coal straw gasification device has the following structure: the furnace body comprises a shell, a rotary kiln, an interlayer rotating net and an inner layer rotating net from outside to inside in sequence, and coal is conveyed into an interlayer of the rotary kiln and the interlayer rotating net. The straw is sent into the interlayer of the interlayer rotating net and the inner layer rotating net. The straw is ignited by the methane burner, and the pulverized coal is ignited by the straw combustion. The rotary kiln rotates, and the water vapor and high-temperature coal in the rotary kiln are subjected to chemical reaction to generate coal gas. The high temperature gas-fired boiler produces water vapor, which then heats the combustion air and the water in the biogas digester. The coal gas becomes clean fuel gas after desulfurization. The methane generating device can produce methane in any season.

Description

Biogas generation device, coal straw gasification device and control method

The technical field is as follows:

the invention relates to a methane generating device, a coal straw gasification device and a control method.

Background art:

the crop straw which is the waste left by the agricultural production in rural areas is the raw material for producing the methane. Mixing the straws with water, fermenting, and decomposing the straws at the temperature of 33 ℃ by bacteria to produce the methane with the methane content of 70 percent. The straw is soaked in water to ferment and produce heat under the condition that the lowest temperature is above 10 ℃, so that the temperature of the straw hydrate is kept above 33 ℃, and bacteria are decomposed to decompose the straw at the temperature of 33 ℃ to generate methane. The lowest temperature is above 10 ℃, which can be achieved by Hainan province all the year, but can not be achieved by Heilongjiang province all the year. After the straws are mixed with water, the straws can float on the water surface, the straw fermentation is influenced, and the methane generated by the straw fermentation is separated from the mixture of the straws and the water. The water and the straws can be fully mixed together only by stirring, the straws can be completely fermented to generate the biogas, and the biogas generated by the straw fermentation can be separated from the straw-water mixture. Dregs generated after straw fermentation float on the water surface to influence the straw fermentation and the generated methane overflow, and the dregs generated after the straw fermentation need to be removed in time. The methane contains 60-70% of methane, so the firepower of the methane gas stove is very strong when cooking.

In the eighties of the last century, people invented the straw gasification furnace, and the fuel gas produced by the straw gasification furnace at that time only contains 14% of carbon monoxide and 1% of hydrogen; therefore, the gas stove of the straw gasification furnace has very small firepower, can only be used for cooking rice and boiling water, and can not be used for cooking dishes. Even if the straw gasification furnace is later modified, the content of carbon monoxide and hydrogen in the fuel gas generated by the straw gasification furnace is only 20 percent in sum, and the firepower of the straw gasification furnace gas stove is still very small.

The gas produced by the semi-water gas method contains 5% of carbon dioxide, 19% of carbon monoxide, 25% of nitrogen and 50% of hydrogen, that is, 69% of combustible gas, so that the gas stove has strong firepower. The semi-water gas method is huge in gas production equipment and is not suitable for being used in natural villages with hundreds of people.

In rural areas, people in rural areas who have rich money use bottled liquefied petroleum gas and methane, and some people use honeycomb briquette, but the pollution of the honeycomb briquette is very large, and most people in rural areas burn wood. In winter, a small part of large cities use natural gas, and most of cities use coal-fired boilers and use heating in cities. And rural areas which account for 50% of the population in China can only be heated by coal-fired furnaces in winter, so that the heating day starts in 10 months and 15 winter in the gregorian calendar every year, namely the day of the haze weather.

The invention content is as follows:

the invention relates to a methane generating device and a coal straw gasification device. The methane generating device mainly comprises a methane tank, a rotary methane generator, a front isolation wall, a spiral slurry pumping machine, a rear isolation wall, a motor, a driving conical gear, a driven conical gear, a spiral feeder, a sealing clamp, a slurry pump or a spiral slurry pumping machine, a centrifugal spin dryer and a heating pipe. The bottom of the methane tank is higher in front and lower in back and is inclined downwards, and the methane tank is made of heat-insulating sealing materials. The rotary methane generator is obliquely arranged on the front separation wall and the rear separation wall in a way that the front part is higher and the rear part is lower. The rotary methane generator is internally provided with a rotary framework, the rotary framework consists of annular steel bars and transverse steel bars, and the transverse steel bars are provided with ribbed plates. The rotary skeleton of the rotary methane generator is provided with a front annular track, a stainless steel rotary net, a front stainless steel ring, a blank section, a rear stainless steel ring, a driven bevel gear, a glass fiber reinforced plastic rotary pipe and a rear annular track from front to back in sequence. The front end outlet of the rotary methane generator is provided with a stainless steel mesh, and the center of the stainless steel mesh is provided with a large round hole. The circular hole of the front isolation wall is sleeved at the front end of the rotary methane generator, and a sponge sealing ring of the rotary methane generator and a plurality of rollers matched with a front annular track of the rotary methane generator are arranged in the circular hole of the front isolation wall. The front section of the spiral feeder and the front stainless steel ring, the blank section and the rear stainless steel ring of the rotary methane generator are wrapped by the sealing clamp. The spiral feeder is obliquely arranged on a cover plate of the methane tank, and the upper section of the spiral feeder is a straw hopper. The motor drives the annular driven bevel gear on the rotary methane generator to rotate through the driving bevel gear, so as to drive the rotary methane generator to rotate. The round hole of the rear separation wall is sleeved at the rear end of the rotary methane generator, and a plurality of rollers matched with the rear annular track of the rotary methane generator are arranged in the round hole of the rear separation wall. The front section of the spiral slurry pumping machine is obliquely placed in the methane tank in front of the front partition wall, the rear section of the spiral slurry pumping machine is fixed on a cover plate of the methane tank, and an output pipe of the spiral slurry pumping machine is connected to a straw hopper of the spiral feeder. The mud pump sinks into a mud pit of the methane tank behind the rear isolation wall, and an output pipe of the mud pump is connected to the centrifugal drying machine. Or the front section of the spiral mud pump is obliquely placed into a mud pit of the methane tank behind the rear partition wall, the rear section of the spiral mud pump is fixed on a cover plate of the methane tank, and an output pipe of the spiral mud pump is connected to the centrifugal drier. The water thrown out from the centrifugal drier flows into the methane tank from the hole of the methane tank cover plate behind the rear separation wall. The two groups of heating pipes enter the methane tank from a methane tank cover plate in front of a front isolation wall of the methane tank, then the two groups of heating pipes pass through the front isolation wall and a rear isolation wall from two sides of the rotary methane generator pipe, and then the two groups of heating pipes pass through the rear isolation wall and then pass through a methane tank cover plate behind the rear isolation wall of the methane tank. A methane output pipe is arranged on a cover plate of the methane tank between the front separation wall and the spiral feeder. The coal straw gasification device has the following structure: the furnace body is provided with a shell, a rotary kiln, an interlayer rotating net and an inner layer rotating net from outside to inside in sequence, the furnace body is arranged on a first support frame and a second support frame in a high-back low mode, a front annular rail of the rotary kiln is pressed on two idler wheels on the first support frame, and a back annular rail of the rotary kiln is pressed on two idler wheels on the second support frame. The rotary kiln is made of foam alloy, and the inner layer rotary net is a conical rotary net. The rear ends of the rotary kiln and the interlayer rotary screen inner layer rotary screen are provided with an annular metal screen and an annular metal plate, the mesh of the annular metal screen is larger, and the annular metal screen leaks coal dust and ash slag left by burning straws down into an ash slag pipe arranged at the tail end of the shell. An upper ash residue electric rotary butterfly valve and a lower ash residue electric rotary butterfly valve are arranged in the ash residue pipe. The annular metal plate is arranged in a central hole of the annular metal net, the annular metal net and the annular metal plate are connected into a piece, the hollow rotating shaft penetrates through the central hole of the annular metal plate, and the annular metal plate is fixed on the hollow rotating shaft. The rear section of the hollow rotating shaft penetrates through a bearing at the rear end of the shell, a driven gear is mounted at the rear section of the hollow rotating shaft and meshed with a driving gear mounted on a rotating shaft of a gear reduction motor, and the gear reduction motor is fixed on a third supporting frame. The rear end of the hollow rotating shaft is movably connected with a combustion-supporting air pipe through an organic silicon sealing ring. A ceramic fiber felt sealing ring is arranged between the rear surface of the front annular rail of the rotary kiln and the shell, a ceramic fiber felt sealing ring is arranged between the middle section of the rotary kiln and the shell, and a ceramic fiber felt sealing ring is arranged between the front surface of the rear annular rail of the rotary kiln and the shell. A flue gas pipe is installed at the top of the front section of the shell, a fuel gas pipe is installed at the top of the rear section of the shell, and a temperature sensor is installed in the shell beside the fuel gas pipe. The gas pipe is provided with a flue gas heater, a boiler and an air heater in sequence, and the gas passes through a hot channel of the flue gas heater, a hot channel of the boiler 47 and a hot channel of the air heater in sequence. The smoke suction fan extracts smoke generated at the front section of the rotary kiln from a smoke pipe, then the smoke passes through a smoke electric regulating valve and then passes through a cold channel of a smoke heater, and then the smoke enters a smoke spraying pipe arranged at the central position of a combustion-supporting air pipe and is sprayed into the hollow rotating shaft. The clean water pump is used for pumping water from the water tank and then enters a cold channel of the boiler through the electric adjusting water valve, water vapor generated by the boiler enters the vapor storage tank, the vapor storage tank is provided with a pressure sensor, and the water vapor coming out of the vapor storage tank enters the combustion-supporting air pipe through the electric adjusting vapor valve. And air blown out by the blower passes through a cold channel of the air heater and then enters the combustion-supporting air pipe through the electric adjusting air valve. The rear end of the shell is provided with a methane burner and a diesel nozzle. The shell front end is equipped with rotatory distributing device, and the output gear of the cloth motor of rotatory distributing device meshes with the cloth gear at the edge of cloth plectane, and several round holes pair with the several round hole of cloth cask bottom on the cloth plectane below the cloth cask, are equipped with the buggy in the cloth cask of rotatory distributing device. The coal powder leaks into an iron groove of a coal chain conveyor through a coal electric rotary valve below a coal powder hopper, and the coal chain conveyor conveys the coal powder into a distribution barrel of a rotary distributor. The upper end of the outer elbow is movably connected with the cloth circular plate, the lower end of the outer elbow is movably connected with the front end of the rotary kiln through a ceramic fiber felt sealing ring, and the upper end of the outer elbow is fixed at the front end of the shell. The central positions of the distribution round barrel and the distribution circular plate of the rotary distributor are penetrated by a straw spiral extrusion conveyor, the lower half part of the straw spiral extrusion conveyor is fixedly connected with the upper end of the inner elbow, and the upper half part of the straw spiral extrusion conveyor is a straw round barrel. The straw leaks into the iron groove of the straw chain conveyor through the electric rotary straw valve arranged on the funnel pipe of the straw funnel, and the straw chain conveyor conveys the straw into the straw barrel of the straw screw extrusion conveyor. The lower end of the inner elbow is communicated with the front end of the interlayer rotating net through a ceramic fiber felt sealing ring. After coming out of the hot channel of the air heater, the fuel gas enters the two groups of heating pipes from the inlets of the two groups of heating pipes on the methane tank cover plate in front of the front separation wall of the methane generating device to heat the water in the methane tank. The gas is collected on a pipe after coming out from two groups of heating pipes on a cover plate of the methane tank 1 behind a rear separation wall of the methane generating device, and then enters the inclined desulfurizer through a gas suction fan. The structure of the inclined desulfurizer is as follows: the inclined desulfurizer consists of an inclined lime water pipe, an inclined quicklime powder pipe, a quicklime powder funnel, an electric rotary butterfly valve, a lime water pump and a lime water pool, wherein the inclined lime water pipe is connected with the inclined quicklime powder pipe to form an inclined upward pipe, the lime water pump pumps out lime water in the lime water pool and then enters the inclined lime water pipe from the upper part of the tail end of the inclined lime water pipe, and the lime water flowing out from a water outlet pipe at the front end of the inclined lime water pipe flows into the lime water pool. A quicklime powder funnel is arranged above the rear end of the inclined quicklime powder tube, an electric rotary butterfly valve is arranged on a funnel tube of the quicklime powder funnel, and the lower end of the funnel tube of the quicklime powder funnel is communicated with the rear end of the inclined quicklime powder tube. The fuel gas enters the inclined lime water pipe from the front end of the inclined lime water pipe, most of sulfur dioxide is removed when the fuel gas passes through the inclined lime water pipe with the flowing lime water, and water and the rest sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe with the quicklime powder. Or the fuel gas enters the spiral desulfurizer through the fuel gas suction fan, and the inclined desulfurizer has the following structure: the spiral desulfurizer is composed of a spiral lime water pipe, an inclined quicklime powder pipe, a quicklime powder hopper, an electric rotary butterfly valve, a lime water pump and a lime water pool, wherein the spiral lime water pipe is a spiral upward pipe, the inclined quicklime powder pipe is an inclined upward pipe, the rear end of the spiral lime water pipe is connected with the front end of the inclined quicklime powder pipe, the lime water pump takes out lime water in the lime water pool and then enters the spiral lime water pipe from the upper part of the tail end of the spiral lime water pipe, and lime water flowing out from a water outlet pipe at the front end of the spiral lime water pipe flows into the lime water pool. A quicklime powder funnel is arranged above the rear end of the inclined quicklime powder tube, an electric rotary butterfly valve is arranged on a funnel tube of the quicklime powder funnel, and the lower end of the funnel tube of the quicklime powder funnel is communicated with the rear end of the inclined quicklime powder tube. The fuel gas enters the spiral lime water pipe from the front end of the spiral lime water pipe, most of sulfur dioxide is removed when the fuel gas passes through the spiral lime water pipe with flowing lime water, and water and the rest sulfur dioxide are removed after the fuel gas passes through the inclined quicklime powder pipe filled with quicklime powder.

A methane generating device and a control method of a coal straw gasification device. Injecting water into the methane tank, and stopping injecting water after the water in the methane tank reaches a set water level. Putting the straws into a straw hopper of a spiral feeder, and starting the spiral feeder to press the straws in the straw hopper into the rotary methane generator. And starting the motor, and driving the driven bevel gear to rotate by the driving bevel gear so as to drive the rotary methane generator to rotate. The straws in the rotary methane generator are soaked in water, and are fermented to generate methane under the action of anaerobic bacteria, and heat is generated to heat the water in the methane tank. When the water temperature of the methane tank is near two temperature values of 33 ℃ and 50 ℃, the speed of generating the methane by the methane generating device is the fastest. After the straws enter the rotary methane generator, the rotary methane generator slowly rotates to enable the transverse reinforcing steel bars of the rotary framework to be provided with ribbed plates for stirring the straws in the stainless steel rotary net of the rotary methane generator, so that the straws in the stainless steel rotary net of the rotary methane generator slowly move forwards and upwards. Biogas generated by straw anaerobic fermentation in a stainless steel rotary net of the rotary biogas generator passes through meshes of the stainless steel rotary net of the rotary biogas generator to reach a biogas chamber at the top of the biogas digester and then enters a biogas pipe. The straws are anaerobically fermented in a stainless steel rotary net of the rotary methane generator to generate methane, the rotary methane generator slowly rotates to enable the straws to be anaerobically fermented to leave lighter substances, the lighter substances are stirred by a ribbed plate arranged on a transverse reinforcing bar of a rotary framework to move forwards and upwards slowly, finally the straws come out from a central hole of the stainless steel net at the front end of the rotary methane generator and float on the water surface of the methane tank in front of the front separation wall and are pumped into a straw hopper of a spiral feeder by a spiral paddle pumping machine. The rotary methane generator rotates slowly, soil on the straws sinks into a glass fiber reinforced plastic rotary pipe of the rotary methane generator under the stirring of a rib plate arranged on a transverse reinforcing bar of the rotary framework, moves downwards and backwards slowly along the glass fiber reinforced plastic rotary pipe of the rotary methane generator, finally comes out from the rear end of the rotary methane generator and flows into a mud pit of a methane tank 1 behind a rear isolation wall; pumped into the centrifugal drier by a mud pump or pumped into the centrifugal drier by a spiral mud pump. The centrifugal drier throws out water in the slurry, and the water thrown out from the centrifugal drier flows into the methane tank from the small hole on the methane tank cover plate behind the rear separation wall. The coal powder leaks into an iron groove of a coal chain conveyor through a coal electric rotary valve below a coal powder hopper, and the coal chain conveyor conveys the coal powder into a distribution barrel of a rotary distributor. An output gear of a distributing motor of the rotary distributing device drives a distributing gear at the edge of a distributing circular plate to rotate, so that the distributing circular plate is driven to rotate; when a plurality of round holes on the cloth circular plate below the cloth barrel are aligned with a plurality of round holes at the bottom of the cloth barrel, the coal powder passes through the plurality of round holes at the bottom of the cloth barrel and the plurality of round holes on the cloth circular plate to flow into an interlayer between the outer elbow and the inner elbow and then flows into an interlayer between the rotary kiln and the interlayer rotating net. The straw leaks into the iron groove of the straw chain conveyor through the electric rotary straw valve arranged on the funnel pipe of the straw funnel, and the straw chain conveyor conveys the straw into the straw barrel of the straw screw extrusion conveyor. The straw in the straw barrel is sent into an interlayer of the interlayer rotating net and the inner layer rotating net through the inner elbow by the straw screw extrusion conveyor. After the interlayer of the interlayer rotating net and the inner layer rotating net is filled with straws, a diesel nozzle arranged at the rear end of the shell sprays diesel oil onto the straws in the interlayer of the interlayer rotating net and the inner layer rotating net. The biogas burner arranged at the rear end of the shell is ignited, and the flame of the biogas burner ignites the straws in the interlayer of the interlayer rotating net sprayed with diesel oil and the inner layer rotating net. And starting a gear reduction motor, wherein a driving gear arranged on a rotating shaft of the gear reduction motor drives a driven gear arranged on the hollow rotating shaft to rotate, so that the rotary kiln, the interlayer rotating net and the inner layer rotating net are driven to rotate. Air blown out by the blower sequentially passes through a cold channel of the air heater and the electric adjusting air valve to enter the combustion-supporting air pipe, then passes through the hollow rotating shaft to enter the inner layer rotating net, and then passes through the inner layer rotating net to support straw combustion in an interlayer of the interlayer rotating net and the inner layer rotating net. The flame of straw burning in the interlayer of the interlayer rotating net 1 and the inner layer rotating net ignites the coal powder in the interlayer of the rotary kiln and the interlayer rotating net. The smoke suction fan extracts a large amount of water vapor and coal tar smoke generated at the front section of the rotary kiln from a smoke pipe, the smoke passes through a cold channel of the smoke heater through the smoke electric regulating valve to be heated, and then enters a smoke spraying pipe arranged at the central position of the combustion-supporting air pipe to be sprayed into the hollow rotating shaft. The clean water pump pumps water from the water tank and then enters a cold channel of the boiler through the electric regulating water valve, water vapor generated by the boiler enters the gas storage tank, and the water vapor coming out of the gas storage tank enters the combustion-supporting air pipe through the electric regulating steam valve. The computer control instrument adjusts the size of the electric adjusting steam valve according to the temperature value set by the temperature sensor arranged in the shell beside the gas pipe, and the computer control instrument adjusts the size of the electric adjusting water valve according to the pressure value set by the pressure sensor arranged on the steam storage tank. The ash residue left by burning the coal powder and the straws leaks down and into the ash residue pipe arranged at the tail end of the shell, and the ash residue electric rotating butterfly valve arranged in the ash residue pipe intercepts the ash residue in the ash residue pipe above the upper ash residue electric rotating butterfly valve. When the ash in the ash pipe above the upper ash electric rotating disc valve reaches a certain amount, the upper ash electric rotating disc valve arranged in the ash pipe is opened to place the ash into the ash pipe between the upper ash electric rotating disc valve and the lower ash electric rotating disc valve, and then the upper ash electric rotating disc valve is closed. Then the electric rotary butterfly valve for discharging the ash is turned on to discharge the ash between the electric rotary butterfly valve for discharging the ash and the electric rotary butterfly valve for discharging the ash, and then the electric rotary butterfly valve for discharging the ash is turned off. The gas enters the inlets of the two groups of heating pipes on the methane tank cover plate in front of the front separation wall of the methane generating device after coming out from the hot channel of the air heater, and then enters the two groups of heating pipes to heat the water in the methane tank. The gas is collected on a pipe after coming out from two groups of heating pipes on a methane tank cover plate behind a rear separation wall of the methane generating device, and then enters the inclined desulfurizer through a gas suction fan. The lime water pump pumps out lime water in the lime water pool, then the lime water enters the inclined lime water pipe from the upper part of the tail end of the inclined lime water pipe, and the lime water flowing out of the water outlet pipe at the front end of the inclined lime water pipe flows into the lime water pool. An electric rotary butterfly valve arranged on a funnel pipe of the quicklime powder funnel rotates, and quicklime powder flows to the rear end of the inclined quicklime powder pipe from the lower end of the funnel pipe of the quicklime powder funnel and then flows downwards along a slope. The fuel gas enters the inclined lime water pipe from the front end of the inclined lime water pipe, most of sulfur dioxide is removed when the fuel gas passes through the inclined lime water pipe with the flowing lime water, and water and the residual sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe with the quicklime powder. Or the gas enters the spiral desulfurizer through the gas suction fan, the lime water in the lime water tank is pumped out by the lime water pump and then enters the spiral pipe from the upper part of the tail end of the spiral lime water pipe, the lime water rotates in the spiral lime water pipe and flows downwards, and the lime water flowing out of the water outlet pipe at the front end of the spiral lime water pipe flows into the lime water tank. An electric rotary butterfly valve arranged on a funnel pipe of the lime powder funnel rotates, and quicklime powder flows to the rear end of the inclined quicklime powder pipe from the lower end of the funnel pipe of the quicklime powder funnel and then flows downwards along a slope. The fuel gas enters the spiral lime water pipe from the front end of the spiral lime water pipe, most of sulfur dioxide is removed when the fuel gas passes through the spiral lime water pipe with flowing lime water, and water and the rest sulfur dioxide are removed after the fuel gas passes through the inclined quicklime powder pipe filled with quicklime powder.

Description of the drawings:

the present invention will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a partial structure diagram of the biogas generating device and the coal stalk gasification device of the present invention.

FIG. 2 is a schematic structural diagram of an inclined desulfurizer of the biogas generation device and the coal straw gasification device of the present invention.

FIG. 3 is a schematic structural diagram of a spiral desulfurizer of the biogas generation device and the coal straw gasification device of the present invention.

The specific implementation mode is as follows:

fig. 1, 2 and 3 show a methane generating device and a coal straw gasifying device. The methane generating device mainly comprises a methane tank 1, a rotary methane generator, a front isolation wall 2, a spiral slurry pumping machine 11, a rear isolation wall 3, a motor 6, a driving conical gear 7, a driven conical gear 8, a spiral feeder 9, a sealing clamp 10, a slurry pump 12 or a spiral slurry pumping machine, a centrifugal drier 13 and a heating pipe 14. The bottom of the methane tank 1 is higher in front and lower in back and is inclined downwards, and the methane tank 1 is made of heat-insulating sealing materials. The rotary methane generator is obliquely arranged on the front partition wall 2 and the rear partition wall 3 in a way that the front part is higher and the rear part is lower. The rotary methane generator is internally provided with a rotary framework, the rotary framework consists of annular steel bars and transverse steel bars, and the transverse steel bars are provided with ribbed plates. The rotary skeleton of the rotary methane generator is provided with a front annular track, a stainless steel rotary net 4, a front stainless steel ring, a blank section, a rear stainless steel ring, a driven bevel gear, a glass fiber reinforced plastic rotary pipe 5 and a rear annular track from front to back in sequence. The front end outlet of the rotary methane generator is provided with a stainless steel mesh, and the center of the stainless steel mesh is provided with a large round hole. The round hole of the front isolation wall 2 is sleeved at the front end of the rotary methane generator, and a sponge sealing ring of the rotary methane generator and a plurality of rollers matched with a front annular track of the rotary methane generator are arranged in the round hole of the front isolation wall 2. The front section of the spiral feeder 9 and the front stainless steel ring, the blank section and the rear stainless steel ring of the rotary methane generator are wrapped by the sealing clamp 10. The spiral feeder 9 is obliquely arranged on a cover plate of the methane tank 1, and the upper section of the spiral feeder 9 is a straw hopper. The motor 6 drives an annular driven bevel gear 8 on the rotary methane generator to rotate through a driving bevel gear 7, so as to drive the rotary methane generator to rotate. The round hole of the rear partition wall 3 is sleeved at the rear end of the rotary methane generator, and a plurality of rollers matched with the rear annular track of the rotary methane generator are arranged in the round hole of the rear partition wall 3. The front section of the spiral paddle pumping machine 11 is obliquely placed in the methane tank 1 in front of the front partition wall 2, the rear section of the spiral paddle pumping machine 11 is fixed on a cover plate of the methane tank 1, and an output pipe of the spiral paddle pumping machine 11 is connected to a straw hopper of the spiral feeder 9. The mud pump 12 sinks into a mud pit of the methane tank 1 behind the rear isolation wall 3, and an output pipe of the mud pump 12 is connected to the centrifugal drier 13. Or the front section of the spiral mud pump is obliquely placed into a mud pit of the methane tank behind the rear partition wall 3, the rear section of the spiral mud pump is fixed on a cover plate of the methane tank 1, and an output pipe of the spiral mud pump is connected to the centrifugal drier 13. The water thrown out from the centrifugal drier 13 flows into the methane tank 1 from the hole of the methane tank 1 cover plate behind the rear separation wall 3. Two groups of heating pipes 14 enter the methane tank 1 from a cover plate of the methane tank 1 in front of a front separation wall 2 of the methane tank 1, then the two groups of heating pipes 14 pass through the front separation wall 2 and a rear separation wall 3 from two sides of a rotary methane generator pipe, and the two groups of heating pipes 14 pass through the rear separation wall 3 and then pass through a cover plate of the methane tank 1 behind the rear separation wall 3 of the methane tank. A methane output pipe 15 is arranged on the cover plate of the methane tank 1 between the front separation wall 2 and the spiral feeder 9. The coal straw gasification device has the following structure: the furnace body is provided with a shell 16, a rotary kiln 17, an interlayer rotating net 18 and an inner layer rotating net 19 from outside to inside in sequence, the furnace body is arranged on a first support frame 20 and a second support frame 20 in a high-back low mode, a front annular rail of the rotary kiln 17 is pressed on two rollers on the first support frame 20, and a back annular rail of the rotary kiln 17 is pressed on two rollers on the second support frame 20. Rotary kiln 17 is made of a foamed alloy and inner rotary screen 19 is a conical rotary screen. The rear ends of the rotary kiln 17, the interlayer rotating net 18 and the inner layer rotating net 19 are provided with an annular metal net and an annular metal plate, the meshes of the annular metal net are large, and the annular metal net leaks the ash residue left by burning the coal powder and the straws into an ash residue pipe arranged at the tail end of the shell 16. An electric rotary butterfly valve 38 for feeding ash and an electric rotary butterfly valve 39 for discharging ash are arranged in the ash pipe. The annular metal plate is arranged in a central hole of the annular metal net, the annular metal net and the annular metal plate are connected into a piece, the hollow rotating shaft 35 penetrates through the central hole of the annular metal plate, and the annular metal plate is fixed on the hollow rotating shaft 35. The rear section of the hollow rotating shaft 35 penetrates through a bearing at the rear end of the shell 16, a driven gear 36 is arranged at the rear section of the hollow rotating shaft 35, the driven gear 36 is meshed with a driving gear arranged on a rotating shaft of a gear reduction motor 37, and the gear reduction motor 37 is fixed on the third supporting frame 20. The rear end of the hollow rotating shaft 35 is movably connected with a combustion-supporting air pipe 40 through an organic silicon sealing ring. A ceramic fiber felt sealing ring is arranged between the rear surface of the front annular track of the rotary kiln 17 and the shell 16, a ceramic fiber felt sealing ring is arranged between the middle section of the rotary kiln 17 and the shell 16, and a ceramic fiber felt sealing ring is arranged between the front surface of the rear annular track of the rotary kiln 17 and the shell 16. A flue gas pipe is arranged at the top of the front section of the shell 16, a fuel gas pipe is arranged at the top of the rear section of the shell 16, and a temperature sensor is arranged in the shell 16 beside the fuel gas pipe. The gas pipe is provided with a flue gas heater 43, a boiler 47 and an air heater 51 in sequence, and the gas passes through a hot channel of the flue gas heater 43, a hot channel of the boiler 47 and a hot channel of the air heater 51 in sequence. The flue gas suction fan 41 extracts the flue gas generated at the front section of the rotary kiln 17 from the flue gas pipe, passes through the flue gas electric regulating valve 42, then passes through the cold channel of the flue gas heater 43, then enters the smoke spraying pipe arranged at the central position of the combustion-supporting air pipe 40, and is sprayed into the hollow rotating shaft 35. The clean water pump 45 pumps water from the water tank 44 and then enters a cold channel of the boiler 47 through the electric adjusting water valve 46, water vapor generated by the boiler 47 enters the vapor storage tank 48, the vapor storage tank 48 is provided with a pressure sensor, and the water vapor from the vapor storage tank 48 enters the combustion-supporting air pipe 40 through the electric adjusting vapor valve 49. The air blown by the blower 50 passes through the cold channel of the air heater 51 and enters the combustion-supporting air duct 40 through the electric adjusting air valve 52. The rear end of the shell 16 is provided with a biogas burner 34 and a diesel nozzle 33. The front end of the shell 16 is provided with a rotary distributor, an output gear of a distribution motor 30 of the rotary distributor is meshed with a distribution gear at the edge of a distribution circular plate 29, a plurality of round holes are formed in the distribution circular plate 29 below a distribution round barrel 28 and are matched with a plurality of round holes at the bottom of the distribution round barrel 28, and pulverized coal is filled in the distribution round barrel 28 of the rotary distributor. The coal powder leaks into an iron groove of a coal chain conveyor 27 through a coal electric rotary valve 26 below a coal powder hopper 25, and the coal chain conveyor 27 conveys the coal powder into a distribution barrel 28 of the rotary distributor. The upper end of the outer elbow 32 is movably connected with the cloth circular plate 29, the lower end of the outer elbow 32 is movably connected with the front end of the rotary kiln 17 through a ceramic fiber felt sealing ring, and the upper end of the outer elbow 32 is fixed at the front end of the shell 16. The central positions of the distribution barrel 28 and the distribution circular plate 29 of the rotary distributor are penetrated by a straw spiral extrusion conveyor 24, the lower half part of the straw spiral extrusion conveyor 24 is fixedly connected with the upper end of an inner elbow 31, and the upper half part of the straw spiral extrusion conveyor 24 is a straw barrel. The straw leaks into the iron groove of the straw chain conveyor 23 through the electric straw rotary valve 22 arranged on the funnel pipe of the straw funnel 21, and the straw chain conveyor 23 conveys the straw into the straw barrel of the straw screw extrusion conveyor 24. The lower end of the inner elbow 31 is connected with the front end of the interlayer rotating net 18 through a ceramic fiber felt sealing ring. After coming out of the hot channel of the air heater 51, the fuel gas enters the two groups of heating pipes 14 from the inlets of the two groups of heating pipes 14 on the cover plate of the methane tank 1 in front of the front separation wall 2 of the methane generating device to heat the water in the methane tank 1. The gas is collected on a pipe after coming out from two groups of heating pipes 14 on a cover plate of the methane tank 1 behind a rear partition wall 3 of the methane generating device, and then enters the inclined desulfurizer through a gas suction fan 53. The structure of the inclined desulfurizer is as follows: the inclined desulfurizer consists of an inclined lime water pipe 54, an inclined lime powder pipe 58, a lime powder funnel 59, an electric rotary butterfly valve 60, a lime water pump 56 and a lime water tank 55, wherein the inclined lime water pipe 54 is connected with the inclined lime powder pipe 58 to form an inclined upward pipe, the lime water pump 56 pumps out lime water in the lime water tank 55 and then enters the inclined lime water pipe 54 from the upper part of the tail end of the inclined lime water pipe 54, and the lime water flowing out from a water outlet pipe 57 at the front end of the inclined lime water pipe 54 flows into the lime water tank 55. A quicklime powder funnel 59 is arranged above the rear end of the inclined quicklime powder pipe 58, an electric rotary butterfly valve 60 is arranged on a funnel pipe of the quicklime powder funnel 59, and the lower end of the funnel pipe of the quicklime powder funnel 59 is communicated with the rear end of the inclined quicklime powder pipe 58. The fuel gas enters the inclined lime water pipe 54 from the front end of the inclined lime water pipe 54, most of sulfur dioxide is removed when the fuel gas passes through the inclined lime water pipe 54 where lime water flows, and moisture and the rest of sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe 58 containing quicklime powder. Or the fuel gas enters the spiral desulfurizer through the fuel gas suction fan 53, and the inclined desulfurizer has the following structure: the spiral desulfurizer consists of a spiral lime water pipe 54 ', an inclined quicklime powder pipe 58, a quicklime powder funnel 59, an electric rotary butterfly valve 60, a lime water pump 56 and a lime water tank 55, wherein the spiral lime water pipe 54' is a spiral upward pipe, the inclined quicklime powder pipe 58 is an inclined upward pipe, the rear end of the spiral lime water pipe 54 'is connected with the front end of the inclined quicklime powder pipe 58, the lime water pump 56 pumps out lime water in the lime water tank 55 and then enters the spiral lime water pipe 54' from the upper part of the tail end of the spiral lime water pipe 54 ', and the lime water flowing out of a water outlet pipe 57 at the front end of the spiral lime water pipe 54' flows into the lime water tank 55. A quicklime powder funnel 59 is arranged above the rear end of the inclined quicklime powder pipe 58, an electric rotary butterfly valve 60 is arranged on a funnel pipe of the quicklime powder funnel 59, and the lower end of the funnel pipe of the quicklime powder funnel 59 is communicated with the rear end of the inclined quicklime powder pipe 58. The fuel gas enters the spiral lime water pipe 54 ' from the front end of the spiral lime water pipe 54 ', most of sulfur dioxide is removed when passing through the spiral lime water pipe 54 ' with the flowing lime water, and water and the rest of sulfur dioxide are removed after passing through the inclined lime powder pipe 58 with the lime powder.

Fig. 1, 2 and 3 show a control method of a biogas generation device and a coal straw gasification device. Injecting water into the methane tank 1, and stopping injecting water after the water in the methane tank 1 reaches a set water level. The straws are put into a straw hopper of the spiral feeder 9, and the spiral feeder 9 is started to press the straws in the straw hopper into the rotary methane generator. The motor 6 is started, the driving bevel gear 7 drives the driven bevel gear 8 to rotate, and therefore the rotary methane generator is driven to rotate. The straws in the rotary methane generator are soaked in water, and are fermented to generate methane under the action of anaerobic bacteria, and heat is generated to heat the water in the methane tank 1. When the water temperature of the methane tank is near two temperature values of 33 ℃ and 50 ℃, the speed of generating the methane by the methane generating device is the fastest. After the straws enter the rotary methane generator, the rotary methane generator slowly rotates to enable the transverse reinforcing steel bars of the rotary framework to be provided with ribbed plates for stirring the straws in the stainless steel rotary net 4 of the rotary methane generator, so that the straws in the stainless steel rotary net 4 of the rotary methane generator slowly move forwards and upwards. Biogas generated by anaerobic fermentation of straws in the stainless steel rotary net 4 of the rotary biogas generator passes through meshes of the stainless steel rotary net 4 of the rotary biogas generator to reach a biogas chamber at the top of the biogas digester and then enters a biogas pipe 15. The straws are anaerobically fermented in a stainless steel rotary net 4 of the rotary methane generator to generate methane, the rotary methane generator slowly rotates to enable the straws to be anaerobically fermented to leave lighter substances, the lighter substances are stirred by a rib plate arranged on a transverse reinforcing bar of a rotary framework to slowly move forwards and upwards, finally the straws come out from a central hole of the stainless steel net at the front end of the rotary methane generator, float on the water surface of the methane tank 1 in front of the front separation wall 2 and are pumped into a straw hopper of a spiral feeder 9 by a spiral paddle pump 11. The rotary methane generator rotates slowly, soil on the straws sinks into the glass fiber reinforced plastic rotary pipe 5 of the rotary methane generator under the stirring of the ribbed plates arranged on the transverse reinforcing steel bars of the rotary framework, moves downwards and backwards slowly along the glass fiber reinforced plastic rotary pipe 5 of the rotary methane generator, finally comes out from the rear end of the rotary methane generator and flows into a mud pit of the methane tank 1 behind the rear partition wall 3; is pumped into the centrifugal drier 13 by a mud pump 12 or is pumped into the centrifugal drier 13 by a screw mud pump. The centrifugal drier 13 throws out water in the slurry, and the water thrown out from the centrifugal drier 13 flows into the methane tank 1 from the small hole on the cover plate of the methane tank 1 behind the rear separation wall 3. The coal powder leaks into an iron groove of a coal chain conveyor 27 through a coal electric rotary valve 26 below a coal powder hopper 25, and the coal chain conveyor 27 conveys the coal powder into a distribution barrel 28 of the rotary distributor. An output gear of a distributing motor 30 of the rotary distributing device drives a distributing gear at the edge of a distributing circular plate 29 to rotate, so that the distributing circular plate 29 is driven to rotate; when a plurality of round holes on the cloth circular plate 29 below the cloth barrel 28 are aligned with a plurality of round holes at the bottom of the cloth barrel 28, the coal powder passes through the plurality of round holes at the bottom of the cloth barrel 28 and the plurality of round holes on the cloth circular plate 29 to flow into an interlayer between the outer elbow 32 and the inner elbow 31, and then flows into an interlayer between the rotary kiln 17 and the interlayer rotary screen 18. The straw leaks into the iron groove of the straw chain conveyor 23 through the electric straw rotary valve 22 arranged on the funnel pipe of the straw funnel 21, and the straw chain conveyor 23 conveys the straw into the straw barrel of the straw screw extrusion conveyor 24. The straw in the straw barrel is sent into the interlayer of the interlayer rotating net 18 and the inner layer rotating net 19 by the straw screw extrusion conveyor 24 through the inner elbow 31. After the straw is filled in the interlayer between the interlayer rotating net 18 and the inner layer rotating net 19, the diesel oil nozzle 33 arranged at the rear end of the shell 16 sprays diesel oil onto the straw in the interlayer between the interlayer rotating net 18 and the inner layer rotating net 19. The biogas burner 34 arranged at the rear end of the shell 16 is ignited, and the flame of the biogas burner 34 ignites the straws in the interlayer of the interlayer rotating net 18 sprayed with diesel oil and the inner layer rotating net 19. And starting the gear reduction motor 37, wherein a driving gear arranged on a rotating shaft of the gear reduction motor 37 drives a driven gear 36 arranged on the hollow rotating shaft 35 to rotate, so that the rotary kiln 17, the interlayer rotary net 18 and the inner layer rotary net 19 are driven to rotate. Air blown by the blower 50 sequentially passes through a cold channel of the air heater 51 and the electric adjusting air valve 52 to enter the combustion-supporting air pipe 40, then passes through the hollow rotating shaft 35 to enter the inner layer rotating net 19, and then passes through the inner layer rotating net 19 to support straw combustion in an interlayer of the interlayer rotating net 18 and the inner layer rotating net 19. The flame of straw burning in the interlayer of the interlayer rotating net 18 and the inner layer rotating net 19 ignites the coal powder in the interlayer of the rotary kiln 17 and the interlayer rotating net 18. The flue gas suction fan 41 extracts a large amount of water vapor and coal tar flue gas generated at the front section of the rotary kiln 17 from the flue gas pipe, passes through the flue gas electric regulating valve 42, then passes through the cold channel of the flue gas heater 43 to be heated, and then enters the smoke spraying pipe arranged at the center of the combustion-supporting air pipe 40 to be sprayed into the hollow rotating shaft 35. The clean water pump 45 pumps water from the water tank 44 and then enters a cold channel of the boiler 47 through the electric adjusting water valve 46, water vapor generated by the boiler 47 enters the air storage tank 48, and the water vapor from the air storage tank 48 enters the combustion-supporting air pipe 40 through the electric adjusting steam valve 49. The computer controller adjusts the size of the electric adjusting steam valve 49 according to the temperature value set by the temperature sensor arranged in the shell 16 beside the gas pipe, and the computer controller adjusts the size of the electric adjusting water valve 46 according to the pressure value set by the pressure sensor arranged on the steam storage tank 48. The ash residue left by burning the coal powder and the straws flows down and into the ash residue pipe arranged at the tail end of the shell 16 from the annular metal net, and the ash residue is trapped in the ash residue pipe above the upper ash residue electric rotary butterfly valve 38 by the upper ash residue electric rotary butterfly valve 38 arranged in the ash residue pipe. When the ash in the ash pipe above the ash electric rotating butterfly valve 38 reaches a certain amount, the ash electric rotating butterfly valve 38 for loading ash in the ash pipe is opened to place the ash in the ash pipe between the ash electric rotating butterfly valve 38 for loading ash and the ash electric rotating butterfly valve 39 for lowering ash, and then the ash electric rotating butterfly valve 38 for loading ash is closed. Then the lower ash electric rotary butterfly valve 39 is opened to discharge the ash between the upper ash electric rotary butterfly valve 38 and the lower ash electric rotary butterfly valve 39, and then the lower ash electric rotary butterfly valve 39 is closed. The gas enters the inlet of the two groups of heating pipes 14 on the cover plate of the methane tank 1 in front of the front separation wall 2 of the methane generating device after coming out from the hot channel of the air heater 51 and enters the two groups of heating pipes 14 to heat the water in the methane tank 1. The gas is collected on a pipe after coming out from two groups of heating pipes 14 on a cover plate of the methane tank 1 behind a rear partition wall 3 of the methane generating device, and then enters the inclined desulfurizer through a gas suction fan 53. The lime water pump 56 pumps out lime water in the lime water pool 55, then the lime water enters the inclined lime water pipe 54 from the upper part of the tail end of the inclined lime water pipe 54, and the lime water flowing out of a water outlet pipe 57 at the front end of the inclined lime water pipe 54 flows into the lime water pool 55. An electric rotary butterfly valve 60 arranged on the funnel pipe of the quicklime powder funnel 59 rotates, and quicklime powder flows to the rear end of the inclined quicklime powder pipe 58 from the lower end of the funnel pipe of the quicklime powder funnel 59 and then flows downwards along the slope. The fuel gas enters the inclined lime water pipe 54 from the front end of the inclined lime water pipe 54, most of sulfur dioxide is removed when the fuel gas passes through the inclined lime water pipe 54 where lime water flows, and water and the rest of sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe 58 containing quicklime powder. Or the fuel gas enters the spiral desulfurizer through the fuel gas suction fan 53, the lime water pump 56 pumps out the lime water in the lime water tank 55 and then enters the spiral pipe 54 'from the upper part of the tail end of the spiral lime water pipe 54', the lime water rotates and flows downwards in the spiral lime water pipe 54 ', and the lime water flowing out of the water outlet pipe 57 at the front end of the spiral lime water pipe 54' flows into the lime water tank 55. An electric rotary butterfly valve 60 arranged on the funnel pipe of the lime powder funnel 59 rotates, and quicklime powder flows to the rear end of the inclined quicklime powder pipe 58 from the lower end of the funnel pipe of the quicklime powder funnel 59 and then flows downwards along the slope. The fuel gas enters the spiral lime water pipe 54 ' from the front end of the spiral lime water pipe 54 ', most of sulfur dioxide is removed when passing through the spiral lime water pipe 54 ' with the flowing lime water, and water and the rest of sulfur dioxide are removed after passing through the inclined lime powder pipe 58 with the lime powder.

Claims

1. A marsh gas generating device and a coal straw gasification device are characterized in that: the biogas generating device mainly comprises a biogas digester (1), a rotary biogas generator, a front isolation wall (2), a spiral slurry pumping machine (11), a rear isolation wall (3), a motor (6), a driving conical gear (7), a driven conical gear (8), a spiral feeder (9), a sealing clamp (10), a slurry pump (12) or a spiral slurry pumping machine, a centrifugal drier (13) and a heating pipe (14); the bottom of the methane tank (1) is high in front and low in back and is inclined downwards, the methane tank (1) is made of heat-insulating sealing materials, the rotary methane generator is arranged on the front separation wall (2) and the back separation wall (3) in a front-high and back-low inclined mode, a rotary framework is arranged in the rotary methane generator and consists of annular steel bars and transverse steel bars, rib plates are arranged on the transverse steel bars, a front annular rail, a stainless steel rotary net (4), a front stainless steel ring, a blank section, a rear stainless steel ring, a driven bevel gear, a glass fiber reinforced plastic rotary pipe (5) and a rear annular rail are sequentially arranged on the rotary framework of the rotary methane generator from front to back, a stainless steel mesh is arranged at an outlet at the front end of the rotary methane generator, a large circular hole is formed in the center of the stainless steel mesh, the circular hole of the front separation wall (2) is sleeved at the front end of the rotary methane generator, and a sponge sealing ring of the rotary methane generator and the front ring of the rotary methane generator are The front section of the spiral feeder (9) and the front stainless steel ring, the blank section and the rear stainless steel ring of the rotary methane generator are wrapped by a sealing clamp (10), the spiral feeder (9) is obliquely arranged on a cover plate of the methane tank (1), and the upper section of the spiral feeder (9) is a straw hopper; the motor (6) drives an annular driven bevel gear (8) on the rotary methane generator to rotate through a driving bevel gear (7), so as to drive the rotary methane generator to rotate; a round hole of the rear separation wall (3) is sleeved at the rear end of the rotary methane generator, and a plurality of rollers matched with a rear annular track of the rotary methane generator are arranged in the round hole of the rear separation wall (3); the front section of the spiral propeller extractor (11) is obliquely placed into the methane tank (1) in front of the front partition wall (2), the rear section of the spiral propeller extractor (11) is fixed on a cover plate of the methane tank (1), and an output pipe of the spiral propeller extractor (11) is connected to a straw hopper of the spiral feeder (9); a mud pump (12) sinks into a mud pit of the methane tank (1) behind the rear isolation wall (3), an output pipe of the mud pump (12) is connected to a centrifugal drier (13), or the front section of a spiral mud pump is obliquely placed into the mud pit of the methane tank behind the rear isolation wall (3), the rear section of the spiral mud pump is fixed on a cover plate of the methane tank (1), the output pipe of the spiral mud pump is connected to the centrifugal drier (13), water thrown out of the centrifugal drier (13) flows into the methane tank (11) from a hole of the cover plate of the methane tank (1) behind the rear isolation wall (3), two groups of heating pipes (14) enter the methane tank (1) from the cover plate in front of the front isolation wall (2) of the methane tank (1), then the two groups of heating pipes (14) pass through the front isolation wall (2) and the rear isolation wall (3) from two sides of the rotary methane generator, two groups of heating pipes (14) which pass through the rear separation wall (3) pass through a cover plate of the methane tank (1) behind the rear separation wall (3) of the methane tank, and a methane output pipe (15) is arranged on the cover plate of the methane tank (1) between the front separation wall (2) and the spiral feeder (9); the coal straw gasification device has the following structure: the furnace body is sequentially provided with a shell (16), a rotary kiln (17), an interlayer rotating net (18) and an inner layer rotating net (19) from outside to inside, the front part of the furnace body is arranged on a first support frame (20) and a second support frame (20) in a high-back low-back mode, a front annular track of the rotary kiln (17) is pressed on two rollers on the first support frame (20), a back annular track of the rotary kiln (17) is pressed on two rollers on the second support frame (20), the rotary kiln (17) is made of foam alloy, the inner layer rotating net (19) is a conical rotating net, and the rotary kiln (17), the rear ends of the interlayer rotating net (18) and the inner layer rotating net (19) are provided with an annular metal net and an annular metal plate, the meshes of the annular metal net are large, the annular metal net leaks ash left after burning coal powder and straws into an ash pipe arranged at the tail end of the shell (16), and an upper ash electric rotating butterfly valve (38) and a lower ash electric rotating butterfly valve (39) are arranged in the ash pipe; the annular metal plate is arranged in a central hole of the annular metal net, the annular metal net and the annular metal plate are connected into a piece, a hollow rotating shaft (35) penetrates through the central hole of the annular metal plate, the annular metal plate is fixed on the hollow rotating shaft (35), the rear section of the hollow rotating shaft (35) penetrates through a bearing at the rear end of a shell (16), a driven gear (36) is arranged at the rear section of the hollow rotating shaft (35), the driven gear (36) is meshed with a driving gear arranged on a rotating shaft of a gear reduction motor (37), the gear reduction motor (37) is fixed on a third support frame (20), the rear end of the hollow rotating shaft (35) is movably connected with a combustion-supporting air pipe (40) through an organic silicon sealing ring, a ceramic fiber felt sealing ring is arranged between the rear surface of a front annular track of the rotary kiln (17) and the shell (16), and a ceramic fiber felt sealing ring is arranged between, a ceramic fiber felt sealing ring is arranged between the front of a rear annular rail of the rotary kiln (17) and the shell (16), a flue gas pipe is arranged at the top of the front section of the shell (16), a gas pipe is arranged at the top of the rear section of the shell (16), a temperature sensor is arranged in the shell (16) beside the gas pipe, a flue gas heater (43), a boiler (47) and an air heater (51) are sequentially arranged on the gas pipe, the gas sequentially passes through a hot channel of the flue gas heater (43), a hot channel of the boiler (47) and a hot channel of the air heater (51), the flue gas generated at the front section of the rotary kiln (17) is pumped out of the flue gas pipe by a flue gas suction fan (41), then passes through a cold channel of the flue gas heater (43) after passing through a flue gas electric regulating valve (42), then enters a smoke spraying pipe arranged at the center of a combustion-supporting air pipe (40) and is sprayed into the hollow rotating shaft (35), a clean water pump (45) pumps water from a water tank, water vapor generated by a boiler (47) enters a vapor storage tank (48), the vapor storage tank (48) is provided with a pressure sensor, the water vapor from the vapor storage tank (48) enters a combustion-supporting air pipe (40) through an electric adjusting vapor valve (49), air blown out by an air blower (50) passes through a cold channel of an air heater (51) and enters the combustion-supporting air pipe (40) through an electric adjusting air valve (52), and the rear end of a shell (16) is provided with a biogas burner (34) and a diesel nozzle (33); the front end of the shell (16) is provided with a rotary distributing device, an output gear of a distributing motor (30) of the rotary distributing device is meshed with a distributing gear at the edge of a distributing circular plate (29), a plurality of round holes on the distributing circular plate (29) below a distributing circular barrel (28) are matched with a plurality of round holes at the bottom of the distributing circular barrel (28), coal powder is filled in the distributing circular barrel (28) of the rotary distributing device, the coal powder leaks into an iron groove of a coal chain conveyor (27) through a coal electric rotary valve (26) below a coal powder funnel (25), the coal chain conveyor (27) conveys the coal powder into the distributing circular barrel (28) of the rotary distributing device, the upper end of an outer elbow (32) is movably connected with the distributing circular plate (29), the lower end of the outer elbow (32) is movably connected with the front end of the rotary kiln (17) through a ceramic fiber felt sealing ring, the upper end of the outer elbow (32) is fixed at, a straw spiral extrusion conveyor (24) penetrates through the central positions of a distribution barrel (28) and a distribution circular plate (29) of the rotary distributor, the lower half part of the straw spiral extrusion conveyor (24) is fixedly connected with the upper end of an inner elbow (31), the upper half part of the straw spiral extrusion conveyor (24) is a straw barrel, straws leak into an iron groove of a straw chain conveyor (23) through a straw electric rotary valve (22) arranged on a funnel tube of a straw funnel (21), the straws are conveyed into the straw barrel of the straw spiral extrusion conveyor (24) by the straw chain conveyor (23), and the lower end of the inner elbow (31) is communicated with a ceramic fiber felt sealing ring and movably connected with the front end of the interlayer rotary net (18); the gas from the hot channel of air heater (51) back out from the preceding biogas digester (1) apron on two sets of heating pipes (14) of preceding division wall (2) of biogas generating device's preceding biogas digester get into two sets of heating pipes (14), heat the water in biogas digester (1), the gas from biogas generating device's back division wall (3) back two sets of heating pipes (14) on biogas digester (1) apron come out the back and collect on a pipe, then get into the slope desulfurizer through gas suction fan (53), the structure of slope desulfurizer is as follows: the inclined desulfurizer consists of an inclined lime water pipe (54), an inclined lime powder pipe (58), a quicklime powder funnel (59), an electric rotary butterfly valve (60), a lime water pump (56) and a lime water tank (55), wherein the inclined lime water pipe (54) is connected with the inclined lime powder pipe (58) to form an upward inclined pipe, the lime water pump (56) pumps out lime water in the lime water tank (55) and then enters the inclined lime water pipe (54) from the upper part of the tail end of the inclined lime water pipe (54), and lime water flowing out of a water outlet pipe (57) at the front end of the inclined lime water pipe (54) flows into the lime water tank (55); a quicklime powder funnel (59) is arranged above the rear end of the inclined quicklime powder pipe (58), an electric rotary butterfly valve (60) is arranged on a funnel pipe of the quicklime powder funnel (59), and the lower end of the funnel pipe of the quicklime powder funnel (59) is communicated with the rear end of the inclined quicklime powder pipe (58); the fuel gas enters the inclined lime water pipe (54) from the front end of the inclined lime water pipe (54), most of sulfur dioxide is removed when the fuel gas passes through the inclined lime water pipe (54) with the flowing lime water, and moisture and residual sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe (58) filled with quicklime powder; or the fuel gas enters the spiral desulfurizer through the fuel gas suction fan (53), and the inclined desulfurizer has the following structure: the spiral desulfurizer consists of a spiral lime water pipe (54 '), an inclined quicklime powder pipe (58), a quicklime powder funnel (59), an electric rotary butterfly valve (60), a lime water pump (56) and a lime water tank (55), wherein the spiral lime water pipe (54') is a spiral upward pipe, the inclined quicklime powder pipe (58) is an inclined upward pipe, the rear end of the spiral lime water pipe (54 ') is connected with the front end of the inclined quicklime powder pipe (58), the lime water pump (56) pumps out lime water in the lime water tank (55), then the lime water enters the spiral lime water pipe (54') from the upper part of the tail end of the spiral lime water pipe (54 '), and the lime water discharged from a water outlet pipe (57) at the front end of the spiral lime water pipe (54') flows into the lime water tank (55); a quicklime powder funnel (59) is arranged above the rear end of the inclined quicklime powder pipe (58), an electric rotary butterfly valve (60) is arranged on a funnel pipe of the quicklime powder funnel (59), and the lower end of the funnel pipe of the quicklime powder funnel (59) is communicated with the rear end of the inclined quicklime powder pipe (58); the fuel gas enters the spiral lime water pipe (54 ') from the front end of the spiral lime water pipe (54 '), most of sulfur dioxide is removed when the fuel gas passes through the spiral lime water pipe (54 ') with the flowing lime water, and water and residual sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe (58) filled with the lime powder.

2. The control method of the methane generating device and the coal straw gasification device is characterized in that: injecting water into the methane tank (1), stopping injecting water after the water in the methane tank (1) reaches a set water level, putting straws into a straw hopper of a spiral feeder (9), starting the spiral feeder (9) to press the straws in the straw hopper into the rotary methane generator, starting a motor (6), and driving a conical gear (7) to drive a driven conical gear (8) to rotate so as to drive the rotary methane generator to rotate; the straws in the rotary methane generator are soaked in water, the straws are fermented to generate methane under the action of anaerobic bacteria, heat is generated to heat the water in the methane tank (1), when the water temperature of the methane tank is near two temperature values of 33 ℃ and 50 ℃, the speed of the methane generating device for generating the methane is fastest, after the straws enter the rotary methane generator, the rotary methane generator slowly rotates to enable the transverse reinforcing steel bars of the rotary framework to be provided with ribbed plates for stirring the straws in the stainless steel rotary net (4) of the rotary methane generator, so that the straws in the stainless steel rotary net (4) of the rotary methane generator slowly move forwards and upwards, the methane generated by the anaerobic fermentation of the straws in the stainless steel rotary net (4) of the rotary methane generator passes through meshes of the stainless steel rotary net (4) of the rotary methane generator to reach a methane chamber at the top of the methane tank, then enters a biogas pipe (15); straws are subjected to anaerobic fermentation in a stainless steel rotary net (4) of a rotary methane generator to generate methane, the rotary methane generator slowly rotates to enable the light substances left after the straw anaerobic fermentation to slowly move forwards and upwards under the stirring of a ribbed slab arranged on a transverse reinforcing bar of a rotary framework, and finally the light substances come out from a central hole of a stainless steel net at the front end of the rotary methane generator and float on the water surface of a methane tank (1) in front of a front separation wall (2) and are pumped into a straw hopper of a spiral feeder (9) by a spiral paddle pumping machine (11); the rotary methane generator rotates slowly, soil on straws is sunk into a glass fiber reinforced plastic rotary pipe (5) of the rotary methane generator under the stirring of ribs arranged on transverse reinforcing steel bars of a rotary framework, the straws move downwards and backwards slowly along the glass fiber reinforced plastic rotary pipe (5) of the rotary methane generator, finally the straws flow out of the rear end of the rotary methane generator, flow into a mud pit of the methane tank (1) behind a rear isolation wall (3), are pumped into a centrifugal drier (13) by a screw mud pump (12), or are pumped into the centrifugal drier (13) by the screw mud pump, water in the mud is thrown out by the centrifugal drier (13), and the water thrown out of the centrifugal drier (13) flows into the methane tank (1) from a small hole on a cover plate of the methane tank (1) behind the rear isolation wall (3); coal powder leaks into an iron groove of a coal chain conveyor (27) through a coal electric rotary valve (26) below a coal powder funnel (25), the coal chain conveyor (27) conveys the coal powder into a distribution barrel (28) of a rotary distributor, an output gear of a distribution motor (30) of the rotary distributor drives a distribution gear at the edge of a distribution circular plate (29) to rotate, so that the distribution circular plate (29) is driven to rotate, when a plurality of round holes on the distribution circular plate (29) below the distribution barrel (28) are aligned with a plurality of round holes at the bottom of the distribution barrel (28), the coal powder passes through the plurality of round holes at the bottom of the distribution barrel (28) and the plurality of round holes on the distribution circular plate (29) to flow into an interlayer of an outer elbow (32) and an inner elbow (31), and then flows into an interlayer of a rotary kiln (17) and an interlayer rotary screen (18); straws are loaded with an electric straw rotary valve (22) through a funnel tube of a straw funnel (21) and leak into an iron groove of a straw chain conveyor (23), the straw chain conveyor (23) conveys the straws into a straw barrel of a straw spiral extrusion conveyor (24), and the straw spiral extrusion conveyor (24) conveys the straws in the straw barrel into an interlayer of an interlayer rotating net (18) and an inner layer rotating net (19) through an inner elbow (31); after the straw is filled in the interlayer between the interlayer rotating net (18) and the inner layer rotating net (19), the diesel oil is sprayed out by a diesel oil nozzle (33) arranged at the rear end of the shell (16) and sprayed onto the straw in the interlayer between the interlayer rotating net (18) and the inner layer rotating net (19); a biogas burner (34) arranged at the rear end of the shell (16) is ignited, and the flame of the biogas burner (34) ignites straws in an interlayer of the interlayer rotating net (18) sprayed with diesel oil and the inner rotating net (19); starting gear reduction motor (37), the driven gear (36) that the driving gear that gear reduction motor (37) were equipped with in the pivot drove hollow rotating shaft (35) and go up and be equipped with rotate to drive rotary kiln (17), interlayer gyration net (18) and inlayer gyration net (19) and rotate: air blown out by the blower (50) sequentially passes through a cold channel of the air heater (51) and the electric adjusting air valve (52) to enter the combustion-supporting air pipe (40), then passes through the hollow rotating shaft (35) to enter the inner layer rotating net (19), and then passes through the inner layer rotating net (19) to support straw combustion in an interlayer of the interlayer rotating net (18) and the inner layer rotating net (19); the flame of straw burning in the interlayer of the interlayer rotating net (18) and the inner layer rotating net (19) ignites the coal powder in the interlayer of the rotary kiln (17) and the interlayer rotating net (18); the smoke suction fan (41) pumps out a large amount of water vapor and coal tar contained smoke generated at the front section of the rotary kiln (17) from a smoke pipe, then the smoke passes through a smoke electric regulating valve (42), then passes through a cold channel of a smoke heater (43) to be heated, then enters a smoke spraying pipe arranged at the central position of a combustion-supporting air pipe (40), and is sprayed into the hollow rotating shaft (35); a clean water pump (45) pumps water from a water tank (44) and then enters a cold channel of a boiler (47) through an electric water regulating valve (46), water vapor generated by the boiler (47) enters an air storage tank (48), the water vapor discharged from the air storage tank (48) enters a combustion-supporting air pipe (40) through an electric steam regulating valve (49), a computer controller regulates the size of the electric steam regulating valve (49) according to a temperature value set by a temperature sensor arranged in a shell (16) beside a gas pipe, and the computer controller regulates the size of the electric water regulating valve (46) according to a pressure value set by a pressure sensor arranged in the gas storage tank (48); the ash residue left by burning the coal dust and the straws is leaked down from the annular metal net and into the ash residue pipe arranged at the tail end of the shell (16), the ash residue is trapped in the ash residue pipe above the upper ash residue electric rotary disc valve (38) by the upper ash residue electric rotary disc valve (38) arranged in the ash residue pipe, when the ash residue in the ash residue pipe above the upper ash residue electric rotary disc valve (38) reaches a certain amount, an upper ash electric rotary butterfly valve (38) arranged in the ash pipe is opened to place ash into the ash pipe between the upper ash electric rotary butterfly valve (38) and a lower ash electric rotary butterfly valve (39), then the upper ash electric rotary butterfly valve (38) is closed, then the lower ash electric rotary butterfly valve (39) is opened to discharge the ash between the upper ash electric rotary butterfly valve (38) and the lower ash electric rotary butterfly valve (39), and then the lower ash electric rotary butterfly valve (39) is closed; the method comprises the following steps that fuel gas enters two groups of heating pipes (14) on a cover plate of a methane tank (1) in front of a front separation wall (2) of a methane generating device after coming out of a hot channel of an air heater (51) and enters the two groups of heating pipes (14) to heat water in the methane tank (1), the fuel gas enters the two groups of heating pipes (14) on the cover plate of the methane tank (1) behind a rear separation wall (3) of the methane generating device and is collected on one pipe, then enters an inclined desulfurizer through a fuel gas suction fan (53), lime water in a lime water tank (55) is pumped out through a lime water pump (56) and then enters an inclined lime water pipe (54) from the upper part of the tail end of the inclined lime water pipe (54), and lime water flowing out of a water outlet pipe (57) at the front end of the inclined lime water pipe (54; an electric rotary butterfly valve (60) arranged on a funnel pipe of the quicklime powder funnel (59) rotates, and quicklime powder flows to the rear end of the inclined quicklime powder pipe (58) from the lower end of the funnel pipe of the quicklime powder funnel (59) and then flows downwards along a slope; the fuel gas enters the inclined lime water pipe (54) from the front end of the inclined lime water pipe (54), most of sulfur dioxide is removed when the fuel gas passes through the inclined lime water pipe (54) with the flowing lime water, and water and the residual sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe (58) with the quicklime powder; or the fuel gas enters the spiral desulfurizer through the fuel gas suction fan (53), the lime water pump (56) pumps out the lime water in the lime water tank (55) and then enters the spiral pipe (54 ') from the upper part of the tail end of the spiral lime water pipe (54'), the lime water rotates in the spiral lime water pipe (54 ') and flows downwards, and the lime water flowing out of the water outlet pipe (57) at the front end of the spiral lime water pipe (54') flows into the lime water tank (55); an electric rotary butterfly valve (60) arranged on a funnel pipe of the quicklime powder funnel (59) rotates, and quicklime powder flows to the rear end of the inclined quicklime powder pipe (58) from the lower end of the funnel pipe of the quicklime powder funnel (59) and then flows downwards along a slope; the fuel gas enters the spiral lime water pipe (54 ') from the front end of the spiral lime water pipe (54 '), most of sulfur dioxide is removed when the fuel gas passes through the spiral lime water pipe (54 ') with the flowing lime water, and water and residual sulfur dioxide are removed after the fuel gas passes through the inclined lime powder pipe (58) filled with the lime powder.