CN101113671B

CN101113671B - Underground catalytic gasification process of coal

Info

Publication number: CN101113671B
Application number: CN 200710145880
Authority: CN
Inventors: 赵昱; 金国荣; 潘霞
Original assignee: ENN Science and Technology Development Co Ltd
Current assignee: ENN Science and Technology Development Co Ltd
Priority date: 2007-09-04
Filing date: 2007-09-04
Publication date: 2011-05-11
Anticipated expiration: 2027-09-04
Also published as: CN101113671A

Abstract

The invention discloses an underground catalytic gasification technique for coal and is divided into the following steps: (1) an injection well consists of two vertical shafts arranged in interval and a communication passage which is located in the coal bed and communicates the two vertical shafts is arranged; (2) the two sides of the communication passage are respectively provided with an auxiliary well from ground to the coal bed with a certain distance from the communication well; (3) effective components of the catalyst and the carrier materials are mixed into catalyst grains with the grain diameter matching with the coal cracks; (4) the catalyst grains are evenly distributed to the coal cracks through high-pressure fluid; (5) the two vertical shafts in the injection well are respectively converted into a gas intake well and a gas outtake well and then the underground gasification production of coal is carried out by the prior art. By adopting the special catalyst grains and corresponding catalyst grain supply method, the invention solves the problem of the distribution of catalyst in the coal bed and realizes underground catalytic gasification of coal.

Description

A kind of underground catalytic gasification process of coal

Technical field

The invention belongs to the underground coal gasification(UCG) production field, especially a kind of underground catalytic gasification process of coal.

Background technology

In the prior art, coal gasification is divided into ground gasification and underground gasification, and wherein the gasification of coal ground realizes by gasification furnace on ground.Press the motion mode of coal in gasification furnace, gasification process can be divided into three classes, i.e. fixed bed (moving bed) evaporating method, thermopnore (ebullated bed) evaporating method and entrained flow gasification method.Underground coal gasification(UCG) is the mode by tunnelling or boring driving, in natural coal seam, arrange air inlet/outlet, gas channel, gasification zone, isolated area and drainage gallery etc., and finally form underground gasification furnace (seeing patent CN 1854459A), then gasifying agent is fed in the coal seam, light the coal seam and control that coal and gasifying agent carry out gasification reaction in the coal seam.

Compare with the ground gasification of coal, underground gasification is an one with multinomial link collection such as the underground lifting of coal mining, tunnelling, coal and ground storage, washing, transportations, with coal mining and the effective combination of clean utilization, having the characteristics of efficient, environmental protection, safety, obviously is a kind of coal gasification with extensive prospect.

In order to improve the gasification result of coal, in the gasification of the ground of coal, people have used catalyzer, utilize catalyzer to realize catalytic gasification to coal.As publication number is " the catalytic coal gasifaction technology " of the Korean Patent document record of KR910007312B.When carrying out coal gasification, after in coal, adding catalyzer such as calcium chloride, calcium oxide, can improve activity, the reduction gasification temperature of coal, and can make gasification complete, thereby utilize catalyzer that coal is carried out catalytic gasification, energy-saving and cost-reducing, the minimizing wasting of resources are had crucial meaning.

Just because of utilizing catalyzer that coal is carried out the excellent effect that catalytic gasification manifested, people also wish the catalytic gasification at underground realization coal, but because the particularity that underground coal gasification(UCG) had, used various technological means can't be applied in the underground gasification of coal in the catalytic gasification of existing coal ground, this also is the reason of the rarely seen report of underground catalytic gasification technology of relevant coal, how to overcome because of coal is arranged in the problems that bring on the stratum, become the obstacle of the underground catalytic gasification of realizing coal.

Summary of the invention

At the problem that prior art exists, the purpose of this invention is to provide a kind of underground catalytic gasification process of coal, this technology has solved because of coal is arranged in the difficulty that bring on the stratum, has realized the underground catalytic gasification of coal.

For achieving the above object, the underground catalytic gasification process of a kind of coal of the present invention is specially:

(1) the injection well is set, this injection well is made of with the interface channel that is arranged in two vertical shafts of connection in coal seam two vertical shafts that are provided with at interval, and wherein vertical shaft is drilled into the coal seam by ground;

(2) respectively in the interface channel both sides at interval the interface channel setting be drilled into the service well in coal seam by ground, the every side of interface channel all includes at least two service wells, and these service wells all are spaced along the interface channel bearing of trend;

(3) preparation catalyst granules is mixed and made into the particle that particle diameter and cracks in coal seam match with catalyzer active ingredient and carrier material;

(4) keeping injecting high-pressure fluid to injecting well under the open situation of service well, and catalyst granules is added in the high-pressure fluid, utilization because of inject well and service well exist pressure reduction by cracks in coal seam to the mobile high-pressure fluid of service well direction, catalyst granules is deployed in the cracks in coal seam;

(5) in subterranean coal, laid catalyzer after, two vertical shafts that inject well are converted to an air inlet well and one go out gas well, utilize known way to carry out the underground gasification operation of coal then.

Further, described high-pressure fluid is water under high pressure or gases at high pressure, and wherein gases at high pressure are O ₂, N ₂, CO ₂In a kind of or its mixture.

Further, described active ingredient is alkali-metal oxide or salt, perhaps is the oxide or the salt of transition metal, perhaps is the complex salt of alkali metal and transition metal, and described carrier material is one or more in plastics, wood chip, silica gel, the activated carbon.

Further, described carrier material is wood chip or activated carbon granule, and described catalyzer active ingredient is mixed with carrier material mutually with impregnation method under fusion or dissolving and starvation state.

Further, described carrier material is plastics or silica gel, and described catalyzer active ingredient is at first mixed with plastics or silica gel, makes catalyst granules through granulation then.

The present invention reaches corresponding catalyst granules feed means by adopting special catalyst granules, solves the difficult problem that catalyzer is laid in the coal seam, thereby has realized the underground catalytic gasification of coal.

Description of drawings

Fig. 1 is used injection well and service well configuration schematic diagram in the technology of the present invention;

Fig. 2 is an A-A view profile among Fig. 1;

Fig. 3 is a B-B view profile among Fig. 1.

The specific embodiment

Shown in accompanying drawing 1-3, the underground catalytic gasification process of a kind of coal of the present invention gets out two vertical shafts 1, No. 2 at interval at first on the ground, and vertical shaft is drilled into the inclined to one side bottom of subterranean coal when implementing, 1, No. 2 two vertical shaft is got through in the back along the coal seam, form the interface channel that connects two vertical shafts; Get out a plurality of service wells in the interface channel both sides again along the interface channel bearing of trend then, service well is drilled into the coal seam by ground equally; Keeping injecting water under high pressure or gases at high pressure to 1, No. 2 vertical shaft under the open situation of service well, and previously prepared catalyst granules is added in water under high pressure or the gases at high pressure, owing to have pressure differential between the service well of interface channel and its both sides, therefore the water under high pressure or the gases at high pressure that are injected in the interface channel will carry catalyst granules automatically along the service well direction diffusion of cracks in coal seam to both sides, and in the process of diffusion, constantly catalyst granules is retained in the cracks in coal seam of process, finish the laying of catalyzer thus in the coal seam.

The used gas componant of above-mentioned gases at high pressure can be selected O for use ₂, N ₂, CO ₂In a kind of or its mixture.

The every side of interface channel all is provided with 3 service wells among the figure, when the interval of 1, No. 2 vertical shaft is big, in order to make catalyst granules be evenly distributed in the subterranean coal as far as possible, the every side of interface channel also can be arranged more service well, and in order to enlarge the coverage of work plane, shown in dotted line in the accompanying drawing, the every side of interface channel also can be provided with two rows even many rows' via hole.

Above-mentioned catalyst granules is mixed and made into by its active ingredient and carrier material thereof, wherein the active ingredient of catalyzer is selected known alkali-metal oxide or salt for use, perhaps be the oxide or the salt of transition metal, perhaps be the complex salt of alkali metal and transition metal, the used carrier material can be selected one or more in plastics, wood chip, silica gel, the activated carbon for use.

When the preparation catalyst granules, according to the carrier material difference, the mode that can flood is mixed catalyzer active ingredient with carrier material particles, when being wood chip or activated carbon granule as carrier material, with melted catalyst active ingredient under the situation of starvation, mix mutually with carrier material with impregnation method, make catalyst granules; Also can earlier catalyzer active ingredient be mixed with carrier material, and then make catalyst granules, when being plastics or silica gel, promptly adopt this mode to prepare catalyst granules as carrier material through granulation.

After in the coal seam, having laid catalyzer, with No. 1 vertical shaft or No. 2 vertical shafts as the air inlet well, with another vertical shaft as going out gas well, carry out the underground gasification operation of coal then in a known way, in this process, can seal the service well of interface channel both sides, also can not seal service well.That is: light the coal seam of air inlet well one side, and inject gasifying agent, be the gasification gas of being produced from the gaseous mixture that goes out gas well output to the air inlet well.

In technology of the present invention, after catalyzer active ingredient and carrier material are mixed and made into the particle with certain intensity, both be convenient to high-pressure fluid and carried and be deployed in the cracks in coal seam, and can guarantee again to be retained in the cracks in coal seam, and unlikelyly flowed away with high-pressure fluid in the fixing mode.When especially adopting light material, can make the catalyst granules of making be similarly lightweight, to guarantee that gases at high pressure can reliably carry as the carrier material of catalyzer.

As the carrier of catalyzer active ingredient, be not limited in the above-mentioned material of enumerating, also can adopt other suitable materials.

Claims

1. the underground catalytic gasification process of a coal, it is specially:

(3) preparation catalyst granules is mixed and made into the particle that particle diameter and cracks in coal seam match with catalyzer active ingredient and carrier material; Described active ingredient is alkali-metal oxide or salt, perhaps is the oxide or the salt of transition metal, perhaps is the complex salt of alkali metal and transition metal; Described carrier material is wood chip or activated carbon granule, and described catalyzer active ingredient is mixed with carrier material mutually with impregnation method under fusion or dissolving and starvation state;

(4) keeping injecting high-pressure fluid to injecting well under the open situation of service well, and catalyst granules is added in the high-pressure fluid, utilization because of inject well and service well exist pressure reduction by cracks in coal seam to the mobile high-pressure fluid of service well direction, catalyst granules is deployed in the cracks in coal seam; Described high-pressure fluid is water under high pressure or gases at high pressure, and wherein gases at high pressure are O ₂, N ₂, CO ₂In a kind of or their mixture;