CN205710621U - The system of high concentration CO is prepared with rubbish charcoal for raw material - Google Patents

Abstract

This utility model belongs to the technical field that solid waste resource recovery processes, and relates to a kind of system preparing high concentration CO with rubbish charcoal for raw material.Described system includes rubbish pretreatment unit, revolving bed pyrolysis oven, disintegrating machine, revolving bed pyrolysis oven, energy-saving denitration device, Oil-gas Separation purifier, CO₂Capturing device and fluidized-bed gasification furnace, revolving bed pyrolysis oven therein, energy-saving denitration device, Oil-gas Separation purifier, CO₂Capturing device and fluidized-bed gasification furnace are sequentially connected with.This utility model with rubbish charcoal as gasified raw material, from pyrolysis gas trapping high concentration CO₂As gasifying agent vaporizing system for high concentration CO, and being applied to gas-based shaft kiln directly reduced iron-smelting process, whole technique, carbon emission amount is low, and environmental benefit is good.

Description

The system of high concentration CO is prepared with rubbish charcoal for raw material

Technical field

This utility model belongs to the technical field that solid waste resource recovery processes, and relates to a kind of with rubbish charcoal for raw material system The system of standby high concentration CO.

Background technology

China is faced with the dual-pressure of environment and the energy, the acceleration being in progress along with economy and urbanization, and the whole nation energy disappears Consuming huge, most big cities face garbage-surrounded city predicament, by technological means, house refuse are become available resources, China's energy and environmental crisis can be alleviated to a certain extent.Domestic garbage pyrolysis technology is high with its resource utilization rate, environment Pollute little advantage increasingly to be favored by people.Domestic garbage pyrolysis primary product has following several: partial thermal decomposition oil passes through Refine and can use as fuel oil；Can as the pyrolysis gas that fuel gas uses include some low-molecular-weight hydrocarbons such as hydrogen, Methane, carbon monoxide etc.；Rubbish charcoal major part exists with white carbon black form, but there is the poisonous and harmful substances such as heavy metal, and calorific value is low, Market outlet is poor；If used as solid fuel, combustion efficiency is poor, and can produce a large amount of secondary pollution in combustion process Thing, environmental benefit is poor.Therefore, most of rubbish charcoals finally carry out landfill disposal only as pyrolysis residue, and land occupation provides Source and cause the waste of the energy.

The pyrolysis gas that house refuse produces after pyrolysis contains the CO of about 30%₂, CO₂Existence can reduce pyrolysis gas Calorific value, reduces its utilization ways, and economic benefit is poor.Pyrolytic carbon major part exists with white carbon black form, is good gasified raw material, If the CO in employing pyrolysis gas₂It is oxidized to CO as gasifying agent, on the one hand can be substantially reduced because burning pyrolytic carbon is carried The problem of environmental pollution come, on the other hand, reduces CO in pyrolysis gas₂Content, improves CO content, improves pyrolysis gas calorific value.

The open one way of life refuse pyrolysis comprehensive resource processing system of patent documentation (patent No. 201420457702.8), House refuse after the pretreatment such as sorting, broken, drying, molding, is pyrolyzed to obtain high-temperature oil gas in pyrolysis oven by this system With rubbish charcoal, generate gasification combustible gas after the gasification of rubbish charcoal, in order to the fuel as heat storage type gas radiation pipe burner.

Owing to this system uses the flue gas of the air frowzy and moisture vapor produced in preprocessing process as rubbish The gasifying agent of charcoal, the combustible gas calorific value that gasification produces is low, and value is low, and gasification gas directly burns simultaneously, does not collect flue gas Middle CO₂, charcoal discharge capacity is big, and environmental benefit is poor.This system uses gasification technology to be gasified by rubbish charcoal, it is achieved rubbish charcoal resource, But reducibility gas concentration is relatively low in product, it is impossible to directly apply to shaft furnace iron-smelting process.

The announcement one adverse current of another patent documentation (patent No. 201210143133.5) turns domestic garbage pyrolysis carbonization Furnace system and garbage treating process, this system mainly includes feed arrangement, rubbish carbonization furnace body, spiral organ of Corti of slagging tap, pyrolysis gas The equipment such as incinerator, circulating fan, air preheater, aerator, pipeline valve, and combine and be connected with rubbish carbonization furnace body Air and heat circulating device carries out perfect, coordinates rubbish carbonization furnace body temperature, the control of the rubbish time of staying, it is achieved to life Rubbish and organic solid castoff process, and the product pyrolysis gas that this patent obtains is directly entered incinerator burning generation 850 The high-temperature flue gas of DEG C-1100 DEG C, rubbish charcoal is as final products.

Above-mentioned utility model be under conditions of heating anaerobic house refuse and organic solid waste resolved into fuel gas and Breeze, combustible gas directly burns, and is not carried out CO₂Recycle, there is charcoal discharge capacity big, the shortcoming of environmental benefit difference.Additionally, Above-mentioned utility model is as final products using rubbish charcoal, and owing to rubbish charcoal calorific value is relatively low, market outlet is not smooth, and containing a huge sum of money The poisonous and harmful substances such as genus, if rubbish charcoal is the most poor as final products, economic benefit and environmental benefit, Technique Popularizing ratio More difficult.

In sum, prior art is not by the CO in domestic garbage pyrolysis gas₂As gasifying agent, rubbish charcoal is as gasification Raw material production high concentration CO, and it is applied to gas-based shaft kiln directly reduced iron-smelting process, realizing the same of rubbish charcoal resource Time, not only improve pyrolysis gas calorific value but also meet CO₂Recycle.

Utility model content

For the problems referred to above, main purpose of the present utility model is to provide and with rubbish charcoal for what high concentration CO prepared by raw material is System, by the CO in domestic garbage pyrolysis gas₂As gasifying agent, rubbish charcoal produces high concentration CO as gasified raw material, and is answered It is used in gas-based shaft kiln directly reduced iron-smelting process.

This utility model provides a kind of method preparing high concentration CO for raw material with rubbish charcoal, and it comprises the following steps:

Pretreatment: rubbish sequentially passes through broken bag, roller screen, sorting and break process, obtains garbage raw material；

Refuse pyrolysis: the described garbage raw material sending into revolving bed pyrolysis oven passes through dry, pyrolysis and priming reaction, obtains Material includes pyrolytic carbon, pyrolysis oil gas；

Broken pyrolytic carbon: through the described pyrolytic carbon particle diameter ＜ 10mm of crusher in crushing；

Energy-conservation deacidification and isolation of purified: described pyrolysis oil gas is at energy-conservation deacidifying device and Oil-gas Separation purifier Reason, obtains pyrolysis gas；

CO₂Trapping: described pyrolysis gas is through CO₂Capturing device processes, and isolates CO₂Gas；

Fluidized-bed gasification furnace gasify: described in isolate CO₂Described fluidized gasification is entered with the described pyrolytic carbon after broken Stove gasifies, and the gasification temperature of fluidized-bed gasification furnace is 900-1100 DEG C, produces gasification gas CO.

At described CO₂In trapping step, described pyrolysis gas enters CO₂The absorption tower of capturing device, in absorption tower and hydramine Solution contacts, the CO in described pyrolysis gas₂Being absorbed by described alkanolamine solution and become rich solution, described rich solution is pumped into solution through rich solution Inhale tower, mixed gas after desorbing and and lean solution cooled device cooling down, the mixed gas after cooling enters gas-liquid separator, Isolate CO₂Gas.

In fluidized-bed gasification furnace gasification step, the gas CO that gasifies described in a part for generation is as gas-based shaft kiln reduction iron production Reducing agent, the CO of generation₂Gas sends into described fluidized-bed gasification furnace；The gas CO that gasifies described in another part sends into described revolving bed Pyrolysis oven.

After the described pyrolysis oil gas obtained after the refuse pyrolysis process by described energy-conservation deacidification, the temperature of described pyrolysis oil gas Degree is down to 250 DEG C-350 DEG C, sour gas volumetric concentration 0.05%；Wet dedusting tower in described Oil-gas Separation purifier 70-80 DEG C of Quench recirculated water is used to spray described pyrolysis oil gas, it is achieved dedusting and pyrolysis oil, the separation of pyrolysis gas, after dedusting Described pyrolysis gas cools down in primary cooler, is then fed into detar in electrical tar precipitator, then is delivered to take off by pyrolysis gas by aerator Sulfur tower and denitrating tower, produce pure pyrolysis gas；Described primary cooler recirculated water and chilled water are by described pyrolysis oil air cooling extremely 20-25 DEG C, the temperature of described recirculated water and described chilled water is respectively 30-35 DEG C and 15-20 DEG C.

The particle diameter ＜ 20mm of the pretreated described garbage raw material of rubbish, the moisture content of described garbage raw material is 20%- 60%.

This utility model provides a kind of system preparing high concentration CO with rubbish charcoal for raw material, comprising:

Rubbish pretreatment unit: be sequentially connected with constituted by broken bag mechanism, roller screen mechanism, sorting mechanism and crushing mechanism, institute State mechanism and be respectively provided with charging aperture and discharging opening；

Revolving bed pyrolysis oven: be made up of, often dry section, pyrolytic reaction one district, pyrolytic reaction two district and pyrolytic reaction three district The top in individual described district has pyrolysis oil gas vent, the radial canal in each described district to have gas inlet；The front end of described dry section Garbage raw material entrance, the end in described pyrolytic reaction three district is had to have pyrolytic carbon discharging opening；

The charging aperture of disintegrating machine is connected with described pyrolytic carbon discharging opening, the outlet of storage charcoal groove and the fluid bed gas of described disintegrating machine The pyrolytic carbon charging aperture changing stove is connected；

Described revolving bed pyrolysis oven, energy-saving denitration device, Oil-gas Separation purifier, CO₂Capturing device and described fluidisation Bed gasification furnace is sequentially connected with.

Further, the pyrolysis oil gas being pyrolyzed oil gas air inlet and described revolving bed pyrolysis oven of described energy-saving denitration device Outlet is connected；

Described Oil-gas Separation purifier is by oil pyrolysis gas pipeline, wet dedusting tower, primary cooler, electrical tar precipitator, air blast Machine, desulfurizing tower, denitrating tower are sequentially connected with composition；Described oil pyrolysis gas pipeline and the pyrolysis oil gas vent of described energy-saving denitration device It is connected.

Described CO₂Capturing device is by absorption tower, rich solution pump, desorber, reboiler, gas-liquid separator, lean pump and lean solution Cooler is sequentially connected with composition；The air inlet on described absorption tower is connected with the gas outlet of the denitrating tower of described energy-saving denitration device, The gas outlet of described gas-liquid separator is connected with the air intake of described fluidized-bed gasification furnace.

At described CO₂In capturing device, the absorption tower second bottom the entrance of described rich solution pump and described absorption tower exports It is connected；Described rich solution delivery side of pump is connected with desorber first entrance on described desorber top；The entrance of described lean pump with Desorber first bottom described desorber exports and is connected；Desorber bottom the entrance of described reboiler and described desorber the Two outlets are connected, and described desorber the second entrance is connected with the outlet of described reboiler, the desorber the 3rd at described desorber top Gas-liquid separator entrance described in outlet, the outlet of described lean pump is connected with the entrance of described lean solution cooler.

The air inlet of air accumulator exports with the gasification gas of described fluidized-bed gasification furnace and is connected, and the first of described air accumulator is given vent to anger Mouth is connected with the gas inlet of described revolving bed pyrolysis oven, and the second gas outlet of described air accumulator is connected with gas-based shaft kiln.

In described revolving bed pyrolysis oven, described garbage raw material layer thickness is 50-250mm.Described fluidized-bed gasification furnace Gasification temperature be 900-1100 DEG C.

The pyrolysis gas that house refuse produces after pyrolysis contains the CO of about 30%₂, due to CO₂It is non-combustible gas, its Existence can reduce the calorific value of pyrolysis gas, and the economic benefit of generation is poor.Rubbish charcoal major part exists with white carbon black form, is good Gasified raw material.Use method and system of the present utility model, pass through CO₂Trapping technique is by the CO in pyrolysis gas₂Separation and collection, so Preparing high concentration CO gas as gasifying agent gasification rubbish charcoal afterwards, a part of CO can going back as gas-based shaft kiln directly reduced ironmaking Former dose, side-product high concentration CO₂, may return to fluidized-bed gasification furnace as gasifying agent.A part of CO can do revolving bed radiation Pipe supplements fuel.On the one hand this utility model can solve the problem of environmental pollution brought because of charcoal of burning away the refuse, and on the other hand, divides CO in trapping pyrolysis gas₂, improve the calorific value of pyrolysis gas, it is achieved rubbish charcoal resource, also can realize CO simultaneously₂Internal process follows Ring utilizes, and reduces charcoal discharge capacity, is conducive to improving whole domestic garbage pyrolysis and processes economic benefit and the environmental benefit of technique.

The beneficial effects of the utility model are:

Employing revolving bed pyrolysis oven is as domestic garbage pyrolysis oil gas and the equipment of pyrolysis oil gas charcoal, complete in same stove Becoming the process being dried, being pyrolyzed, flow process is short, and energy utilization rate is high, is easily achieved scale simultaneously.

From revolving bed pyrolysis oven pyrolysis oil gas out through energy-conservation deacidifying device, realize waste heat recovery and sour gas simultaneously The removing of body, improves energy utilization efficiency, alleviates the sour gas corrosion to equipment.

With rubbish charcoal as gasified raw material, the high concentration CO of trapping from pyrolysis gas₂As gasifying agent vaporizing system for high concentration CO, and it is applied to gas-based shaft kiln directly reduced iron-smelting process, whole technique, carbon emission amount is low, and environmental benefit is strong；The most also Solve rubbish charcoal calorific value low, the problem that market outlet is the most smooth, high financial profit.

Use this utility model, CO₂The response rate reaches more than 90%, and purity reaches more than 98%.High-purity CO₂Exist with rubbish charcoal Normal pressure, carrying out gasification reaction at 1200 DEG C, charcoal conversion ratio reaches more than 97%.In gasification gas, CO purity reaches more than 98%, Ke Yiman The gas-based shaft kiln directly reduced iron-smelting process requirement of foot.CO₂The calorific value of the pyrolysis gas after trapping rises to 5152Kcal/Nm³, significantly carry The utilization of high pyrolysis gas.

Accompanying drawing explanation

Fig. 1 is the system schematic that this utility model prepares high concentration CO with rubbish charcoal for raw material.

Detailed description of the invention

Below in conjunction with drawings and Examples, detailed description of the invention of the present utility model is described in more details, with Just the advantage that better understood when scheme of the present utility model and various aspects.But, specific implementations described below side Formula and embodiment are only descriptive purposes rather than to restriction of the present utility model.

The method that this utility model prepares high concentration CO with rubbish charcoal for raw material includes house refuse pretreatment, rubbish heat Solve, crush pyrolytic carbon, the energy-conservation deacidification of pyrolysis oil gas and isolation of purified, CO₂The steps such as trapping and fluidized-bed gasification furnace gasification.

House refuse pretreatment is that rubbish sequentially passes through broken bag, roller screen, sorting and break process, by bulk therein without Machine thing, metal etc. separates and is crushed to pan feeding requirement, and the particle diameter ＜ 20mm of the pretreated garbage raw material of rubbish, described rubbish is former The moisture content of material is 20%-60%.

In refuse pyrolysis step, garbage raw material uniformly being sent into revolving bed pyrolysis oven, layer thickness is 50-250mm, Heating up through the stage in stove, through being dried, being pyrolyzed and priming reaction, the response time (time that i.e. revolving bed rotates a circle) is about 1h, the material obtained includes pyrolytic carbon, pyrolysis oil gas.

Pyrolytic carbon is through crusher in crushing, the particle diameter ＜ 10mm of pyrolytic carbon.500 DEG C of pyrolysis oil gas enter energy-conservation de-through pipeline Acid device completes waste heat recovery and deacidification, and temperature is down to 350 DEG C, and acidic gas concentration is down to 0.05%.Utilize the waste heat reclaimed Preheating noble gas, preheating temperature is up to about 210 DEG C, and the noble gas after preheating sends into drying process, can be to life Garbage raw material alive, percolate and pyrolysis sewage etc. are evaporated concentrating, it is achieved noble gas recycles.

After process pyrolysis oil gas enter Oil-gas Separation purifier realize the separation of oil gas, the dedusting of pyrolysis gas, desulfurization, Denitration etc..Specifically, Quench recirculated water is first used to spray pyrolysis oil gas in wet dedusting tower, it is achieved dedusting and pyrolysis Oil, the separation of pyrolysis gas, pyrolysis gas enters transverse pipe initial cooler, primary cooler 32 DEG C of recirculated waters and two sections of coolings of 16 DEG C of chilled water Pyrolysis gas is cooled to about 21 DEG C by water.The pyrolysis gas discharged by primary cooler bottom enters the electric tar that two parallel connections operate simultaneously Oil device, completes the tar work carried secretly in gas.By Roots blower, pyrolysis gas is delivered to desulphurization denitration tower again, complete desulfurization and take off Nitre, produces pure pyrolysis gas.

CO₂In trapping step, the pyrolysis gas after Oil-gas Separation purifies feeds absorption tower, in absorption tower through blower fan pressurization With absorbent counter current contacting, use alkanolamine solution as absorbent, the CO in pyrolysis gas₂Absorbed by absorbent, become rich solution, rich Liquid feeds desorber through rich solution pump, and desorbing generates CO₂The mixed gas of gas, steam and mist and lean solution；CO after desorbing₂Warp Cooler carries out cooling down, steam and mist and becomes water and foam；Mixed gas after cooling enters gas-liquid separator, removes Water in mixed gas and foam, isolated CO₂Gas enters fluidized-bed gasification furnace as gasifying agent.

Fluidized-bed gasification furnace gasifies: as the CO of gasifying agent₂Enter described with the broken rear pyrolytic carbon as gasified raw material Fluidized-bed gasification furnace gasifies, and the gasification temperature of fluidized-bed gasification furnace is about 1000 DEG C, produces gasification gas CO.A part of gas Activating QI CO is as the reducing agent in gas-based shaft kiln directly reduced iron-smelting process, and part gasification gas CO is as the supplementary combustion of radial canal Material.

In fluidized-bed gasification furnace gasification step, the gas CO that gasifies described in a part for generation processes through gas-based shaft kiln, produces Raw CO₂Gas sends into described fluidized-bed gasification furnace；The gas CO that gasifies described in another part sends into described revolving bed pyrolysis oven.

Gas-based shaft kiln comprises reduction section and cooling section, during gas-based shaft kiln reduction iron production, and fluidized gasification furnace gas Change the high concentration CO produced to be delivered in gas-based shaft kiln from cooling section, in order to make CO carry out heat exchange with the sponge iron in cooling section Rear entrance reduction section also carries out reduction reaction, and CO is after thermal sponge iron preheats, and temperature reaches more than 850 DEG C, can directly carry out also Former reaction, reduces the reaction temperature of reduction section, and energy consumption reduces.CO after preheating ascends into reduction section, and with the oxidation fallen Pelletizing inversely contacts generation reduction reaction, generates high-temperature sponge iron and high concentration CO₂, CO₂Stream is escaped and enter by top gas outlet Changing bed gasifier bed to use as gasifying agent, this process achieves CO₂Recycle, reduce carbon emission amount.

This utility model is specifically described below and realizes preparing with rubbish charcoal for raw material the system of high concentration CO.

As it is shown in figure 1, according to processing technological requirement, rubbish pretreatment unit is by broken bag mechanism, roller screen mechanism, sorting mechanism Being sequentially connected with composition with crushing mechanism, described mechanism is respectively provided with charging aperture and discharging opening；

Revolving bed pyrolysis oven is made up of dry section, pyrolytic reaction one district, pyrolytic reaction two district and pyrolytic reaction three district, each The top in district has pyrolysis oil gas vent, the radial canal in each district to have gas inlet；There is garbage raw material entrance the front end of dry section, The end in described pyrolytic reaction three district has pyrolytic carbon discharging opening；Radial canal is the heater of revolving bed pyrolysis oven, and it is by combustion Burn for revolving bed pyrolysis oven heat supply.

The charging aperture of disintegrating machine is connected with pyrolytic carbon discharging opening, the storage charcoal groove outlet of disintegrating machine and the heat of fluidized-bed gasification furnace Solve charcoal charging aperture to be connected；

Revolving bed pyrolysis oven, energy-saving denitration device, Oil-gas Separation purifier, CO₂Capturing device, fluidized-bed gasification furnace depend on Secondary connection.

Further, energy-saving denitration device includes noble gas air accumulator, inert gas duct, pyrolysis oil feed channel, takes off Acid-accumulation of heat complex, wherein pyrolysis oil gas air inlet is connected with the pyrolysis oil gas vent of revolving bed pyrolysis oven.

Oil-gas Separation purifier is by oil pyrolysis gas pipeline, wet dedusting tower, primary cooler, electrical tar precipitator, aerator, de- Sulfur tower, denitrating tower are sequentially connected with composition, and oil pyrolysis gas conduit air inlet is connected with the pyrolysis oil gas vent of energy-saving denitration device；Remove Chimney has air inlet and gas outlet, gas wash tower air inlet to be connected with pyrolysis oil feed channel gas outlet, gas wash tower gas outlet and desulfurization Tower air inlet is connected, and desulfurizing tower gas outlet is connected with denitrating tower air inlet.

CO₂Capturing device is cooled down by absorption tower, rich solution pump, desorber, reboiler, gas-liquid separator, lean pump and lean solution Device is sequentially connected with composition；The air inlet on absorption tower is connected with the gas outlet of the denitrating tower of energy-saving denitration device, gas-liquid separator Gas outlet and the CO of fluidized-bed gasification furnace₂Air inlet is connected.

Specifically, the entrance of rich solution pump is connected with absorption tower the second outlet bottom absorption tower；Rich solution delivery side of pump and institute Desorber the first entrance stating desorber top is connected；Desorber first bottom the entrance of lean pump and described desorber exports It is connected；The entrance of reboiler is connected with desorber the second outlet bottom desorber, and desorber the second entrance exports with reboiler It is connected, gas-liquid separator entrance described in desorber the 3rd outlet at desorber top, lean pump outlet and lean solution cooler Entrance be connected.

Fluidized-bed gasification furnace gasification furnace is rubbish charcoal gasification installation, has CO₂Air inlet, pyrolytic carbon charging aperture, CO export With gasification solid discharge, CO outlet is connected with air accumulator air inlet, and pyrolytic carbon charging aperture is connected with storage charcoal groove outlet.

In air accumulator, air inlet exports with the CO of fluidized-bed gasification furnace and is connected, the first gas outlet of air accumulator and rotation The gas inlet of bed pyrolysis oven is connected, and the second gas outlet of air accumulator is connected with gas-based shaft kiln.

Gas-based shaft kiln is provided with charging aperture, discharge gate, reducing gases entrance and top gas outlet, top gas outlet and fluid bed gas The CO2 air inlet changing stove is connected, and gas-based shaft kiln has reduction chamber and is positioned at the cooling chamber below reduction chamber, wherein, described Reduction chamber has reducing gases import, and the cooling gas import of cooling chamber is connected with the second gas outlet of air accumulator.

Embodiment

Using certain city's house refuse is raw material, and material composition composition is shown in Table 1 below.

Table 1 house refuse becomes to be grouped into (wt%)

The rubbish entering factory removes bulk inorganic matter and metal through simple sorting, then crushes, the broken rubbish obtained Rubbish pyrolysis feed particle diameter ＜ 20mm；

Broken rubbish is uniformly fed revolving bed pyrolysis oven, fabric thickness 100mm, and in stove, rubbish is with the rotation of furnace bottom Pyrolytic reaction is completed, wherein dry section temperature through dry section, pyrolytic reaction one district, pyrolytic reaction two district and pyrolytic reaction three district 350 DEG C, pyrolytic reaction one district, pyrolytic reaction two district and pyrolytic reaction three district temperature 800 DEG C, response time 2-3h.

House refuse through pyrolysis oven be pyrolyzed after pyrolysis gas composition and calorific value be shown in Table 2 below.CO in pyrolysis gas₂Contain Amount is 28%, gas heating value 3962Kcal/Nm³。

Table 2 pyrolysis gas composition and calorific value

Through CO₂After capturing device processes, CO₂The response rate is up to more than 90%, and purity is up to more than 98%.High-purity CO₂ Carrying out gasification reaction with rubbish charcoal at normal pressure, at 1200 DEG C, charcoal conversion ratio reaches more than 97%.Gasification gas in CO purity reach 98% with On, gas-based shaft kiln directly reduced iron-smelting process requirement can be met.Trapping CO₂After pyrolysis gas character be shown in Table 3 below.Pyrolysis The calorific value of gas is by 3962Kcal/Nm³Rise to 5152Kcal/Nm³, improve the utilization ways of pyrolysis gas.

Table 3 pyrolysis gas composition and calorific value

Domestic garbage pyrolysis produces substantial amounts of pyrolysis gas, is the primary product of pyrolysis generation economic worth, but due to wherein Containing the CO of about 30%₂, pyrolysis gas calorific value is relatively low, restricts its use approach, reduces the economic effect of Prediction for Solid Waste Treatment Technology Benefit, makes the promotion and application of pyrolytic technique be greatly limited.The CO that this utility model uses₂Trapping technique separates and collects CO₂, improve the calorific value of pyrolysis gas, the CO after collection₂High concentration CO can be prepared, it is achieved CO as gasifying agent₂Recycling, fall Low-carbon emission amount, improves environmental benefit.

There is the poisonous and harmful substances such as heavy metal in rubbish charcoal, calorific value is low, and market outlet is poor, if made as solid fuel With, combustion efficiency is poor, and can produce substantial amounts of secondary pollution in combustion process, and environmental benefit is poor, the most most of rubbish Rubbish charcoal carries out landfill disposal only as pyrolysis residue, land occupation resource and cause the waste of the energy, and this utility model uses Rubbish charcoal is made high concentration CO by gasification technology, can increase economic efficiency as gas-based shaft kiln directly reduced ironmaking reducing agent, with Time output high concentration CO₂Fluidized-bed gasification furnace is returned, it is achieved CO as gasifying agent₂Inner loop utilizes, and makes domestic garbage pyrolysis Technology all has huge competitiveness in terms of economy and the feature of environmental protection, is greatly promoted Technique Popularizing and application.

It is last that it is noted that obviously above-described embodiment is only for clearly demonstrating this utility model example, And not restriction to embodiment.For those of ordinary skill in the field, the most also may be used To make other changes in different forms.Here without also cannot all of embodiment be given exhaustive.And thus That is amplified out obviously changes or changes among still in protection domain of the present utility model.

Claims (7)

1. a system for high concentration CO is prepared with rubbish charcoal for raw material, comprising:

Rubbish pretreatment unit: be sequentially connected with constituted by broken bag mechanism, roller screen mechanism, sorting mechanism and crushing mechanism, described machine Structure is respectively provided with charging aperture and discharging opening；

Revolving bed pyrolysis oven: be made up of dry section, pyrolytic reaction one district, pyrolytic reaction two district and pyrolytic reaction three district, Mei Gesuo The top stating district has pyrolysis oil gas vent, the radial canal in each described district to have gas inlet；There is rubbish the front end of described dry section Rubbish feed(raw material)inlet, the end in described pyrolytic reaction three district has pyrolytic carbon discharging opening；

The charging aperture of disintegrating machine is connected with described pyrolytic carbon discharging opening, the storage charcoal groove outlet of described disintegrating machine and fluidized-bed gasification furnace Pyrolytic carbon charging aperture be connected；

Described revolving bed pyrolysis oven, energy-saving denitration device, Oil-gas Separation purifier, CO₂Capturing device and described fluidized gasification Stove is sequentially connected with.

System the most according to claim 1, it is characterised in that the pyrolysis oil gas air inlet of described energy-saving denitration device and institute The pyrolysis oil gas vent stating revolving bed pyrolysis oven is connected；

Described Oil-gas Separation purifier is by oil pyrolysis gas pipeline, wet dedusting tower, primary cooler, electrical tar precipitator, aerator, de- Sulfur tower, denitrating tower are sequentially connected with composition；Described oil pyrolysis gas pipeline is connected with the pyrolysis oil gas vent of described energy-saving denitration device.

System the most according to claim 2, it is characterised in that described CO₂Capturing device is by absorption tower, rich solution pump, desorbing Tower, reboiler, gas-liquid separator, lean pump and lean solution cooler are sequentially connected with composition；The air inlet on described absorption tower is with described The gas outlet of the denitrating tower of energy-saving denitration device is connected, and the gas outlet of described gas-liquid separator enters with described fluidized-bed gasification furnace QI KOU is connected.

System the most according to claim 3, it is characterised in that the suction bottom the entrance of described rich solution pump and described absorption tower Receive tower second and export connected；Described rich solution delivery side of pump is connected with desorber first entrance on described desorber top；Described lean The entrance of liquid pump is connected with desorber the first outlet bottom described desorber；At the bottom of the entrance of described reboiler and described desorber The desorber second in portion exports and is connected, and described desorber the second entrance is connected with the outlet of described reboiler, described desorber top Desorber the 3rd outlet described in gas-liquid separator entrance, the outlet of described lean pump and the entrance phase of described lean solution cooler Even.

System the most according to claim 4, it is characterised in that the air inlet of air accumulator and the gas of described fluidized-bed gasification furnace Activating QI outlet is connected, and the first gas outlet of described air accumulator is connected with the gas inlet of described revolving bed pyrolysis oven, described storage Second gas outlet of gas tank is connected with gas-based shaft kiln.

System the most according to claim 1, it is characterised in that in described revolving bed pyrolysis oven, described garbage raw material spreads Material thickness is 50-250mm.

System the most according to claim 1, it is characterised in that the gasification temperature of described fluidized-bed gasification furnace is 900-1100 ℃。