CN104018820B - A kind of coal underground gasifying technology system - Google Patents
A kind of coal underground gasifying technology system Download PDFInfo
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- CN104018820B CN104018820B CN201410268371.8A CN201410268371A CN104018820B CN 104018820 B CN104018820 B CN 104018820B CN 201410268371 A CN201410268371 A CN 201410268371A CN 104018820 B CN104018820 B CN 104018820B
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Abstract
The present invention relates to a kind of coal underground gasifying technology system.Including gasifying agent injection hole, gas exit is holed, trunk gasification tunnel, branch's gasification tunnel, boring stay tube, gasifying agent ascending pipe, incendiary agent ascending pipe, sealing device and ignition point mobile device.Described gasifying agent injection hole is connected by trunk gasification tunnel and branch's gasification tunnel with gas exit boring, and described incendiary agent ascending pipe is placed in pipe by gasifying agent ascending pipe, and is connected by sealing device.Gasifying process is: igniting；Judge whether to be passed through steam；It is passed through steam；Judge whether to move forward burning point；Starting ignition point mobile device, burns away.Advantages of the present invention: the horizontal and vertical area of gasification can be expanded, improve gasification of coal reserves, while realizing the automatic ignition without well formula Underground Coal Gasification Process and controllable type retrogressing gas injection, solve gasifying agent short circuit problem in gasification tunnel, reduce the back mixing of product coal gas and gasifying agent, it is ensured that the safety of gasification is carried out.
Description
Technical field
The present invention relates to underground coal gasification(UCG) production field, particularly to a kind of coal underground gasifying technology system.
Background technology
Coal underground gasification technology is recyclable manually can not exploit and exploit uneconomic coal resources, and people have begun working on very early.Underground coal gasification(UCG) is divided into has well formula and without well formula, well formula is had to utilize existing tunnel to carry out underground gasification process, the Chinese patent " a kind of underground coal gasification system and production technology thereof " of publication number CN101315026B, the Chinese patent " long-passage and large-section underground coal gasification in mine " of publication number CN1169501A, the Chinese patent " injection point backing gas injection device in a kind of underground gasification system " etc. of publication number CN201310327035.1 has been well formula coal underground gasification technology, device need to manually be gone into the well installation when installing, inconvenience is installed, safety problem cannot ensure, and device not recoverable.It is unattended that the underground coal gasification(UCG) of formula without well achieves underground, ensure the safety of production process, " connection of a kind of novel underground coal gasification furnace, the gasifying agent injection hole such as Chinese patent " a kind of coal underground gasification method " of publication number CN201110391186.4 and gas exit boring is straight line gasification tunnel and connects; gasification horizontal area and longitudinal area are smaller; gasification of coal reserves are few, and coal seam utilization rate is low for the Chinese patent of publication number CN200810119351.9.The fusing method that uses the Chinese patent " gasifying method for coal seam " of publication number CN1112188A melts piecemeal opens the existing injection point backing of air injection pipe cause for gossip, but air injection pipe can not be burned off, gas is caused to remain unchanged along obsolete air injection pipe to the most burned coal seam gas injection, while reducing coal seam utilization rate, bring unsafe hidden danger to production.Coal ground down-firing is also an important research contents during underground coal gasification(UCG) produces, the Chinese patent " water-bearing coal seam water control igniter " of publication number CN200810119355.7 uses electrically-fired mode to ignite coal seam, but it is adapted only to the aqueous less coal seam of superficial part, owing to no-shaft UCG is applied to deep fractures, the situation such as the occurrence status High Temperature High Pressure of deep fractures, infiltration has had a strong impact on electric ignition.The Chinese patent " without well formula underground coal gasification ignition simulating device " of publication number CN200820010590.6 uses pyrophoric gas silane and oxygen catalytic combustion to reach the purpose of igniting, but, in this patent, silane and oxygen, air are injected in same pipe, combustion inner pipe safety is poor, and burning position is uncontrollable.
Summary of the invention
It is an object of the invention to for narrow without well formula Underground Coal Gasification Process pneumatization, gasification efficiency is low, and gasification is difficult to stability contorting and difficult and unsafe problem of lighting a fire, and a kind of coal underground gasifying technology system proposed.
The technical scheme is that and be achieved in that:
A kind of coal underground gasifying technology system, including gasifying agent injection hole, gas exit is holed, trunk gasification tunnel, branch's gasification tunnel, boring stay tube, gasifying agent ascending pipe, incendiary agent ascending pipe, sealing device and ignition point mobile device.Described gasifying agent injection hole and gas exit boring vertically pierce coal seam, until required gasification bottom；Described trunk gasification tunnel one end connects gasifying agent injection hole, and the other end is divided into Liang Tiao branch gasification tunnel, and the other end of Liang Tiao branch gasification tunnel respectively connects a gas exit boring, forms a gasification unit；Described boring is propped up stay tube outer wall and is provided with steam ascending pipe in the bottom of obturator；Described incendiary agent ascending pipe is placed in pipe by gasifying agent ascending pipe, and is threaded connection with gasifying agent ascending pipe or welds；Described gasifying agent ascending pipe drilled support pipe box is in pipe, and the connection realized with gasifying agent injection hole by obturator is fixed and seals；Described obturator includes upper flange, lower flange, pad and bolt, is threaded connection fixing gasifying agent ascending pipe, and sets the fixing of wing support member auxiliary gasifying agent ascending pipe and the sealing function of sealing device；Described ignition point mobile device is located between gasifying agent ascending pipe and incendiary agent ascending pipe junction point and obturator, including runner, rotating shaft and bracing frame.
The underground coal gasification(UCG) production technology that above-mentioned gasification system realizes:
A. Directional Drilling is utilized vertically to drill gasifying agent injection hole and gas exit boring, horizontal drilling trunk gasification tunnel and branch's gasification tunnel, through gasifying agent injection hole and gas exit boring；Incendiary agent ascending pipe is inserted in gasifying agent ascending pipe, is threaded connection and incendiary agent ascending pipe and gasifying agent ascending pipe are fixed.
B. the sleeve pipe of incendiary agent ascending pipe and gasifying agent ascending pipe is put into a boring stay tube, under to after ignition point, lower flange is enclosed within first wing support member bottom, then sleeve pipe is down pressed, until wing support chip is launched into level, be stuck in lower flange top.
C. pad is placed on upper flange, puts upper flange, rotate upper flange, make upper flange intact with telescopic joint, and be bolted.
D. injecting steam into pipe, gasifying agent ascending pipe, inflammable gas ascending pipe branch, pyrophoric gas ascending pipe branch connects respective gas, and is closed.
E. open inflammable gas ascending pipe branch switch, close after purging incendiary agent ascending pipe.
F. open pyrophoric gas ascending pipe branch switch, gasifying agent ascending pipe is passed through pure oxygen/air, at ignition point, pyrophoric gas contact oxygen after-combustion, it is achieved igniting.
G. after lighting a fire successfully, open inflammable gas ascending pipe branch switch, be passed through inflammable gas, and close pyrophoric gas switch, make ignition point sustained combustion, coal seam of igniting.
H. after the temperature of temperature point reaches more than 400 degree, coal seam is ignited successfully, closes inflammable gas switch.
I., after the temperature of temperature point reaches more than 800 degree, open steam ascending pipe, be passed through steam.
J. when the temperature of temperature point reaches below 600 degree, close steam ascending pipe, turn pine obturator upper flange, starting ignition point mobile device, open the opening and closing mouth of wing support member, take off wing support member, by sleeve pipe toward when pulling on to next wing support member bottom, again sleeve pipe is down pressed, it is achieved the retrogressing of burning.
In gasification, it is continually fed into steam by steam ascending pipe, it is also possible in gasifying agent ascending pipe, discontinuously inject steam, makes steam and gasifying agent be mixed into gasification tunnel.
K. step i, j are returned to, until coal combustion point moves to the gasification tunnel end.
The present invention is compared with prior art:
1. the technical program is divided into the structure of Liang Tiao branch gasification tunnel owing to have employed each trunk gasification tunnel of gasification tunnel, artificially expand the transverse width of gasification face, and utilize the principle of multiple thermal source conjugation burning, naturally width and the height of gasification face are expanded, add the gasification of coal reserves of 1 gasification face, reduce cost；
2. the technical program is 45 ° owing to have employed gasification unit Zhong Liangge branch gasification tunnel with trunk gasification tunnel angle, it is possible in the case of holding cost and quantities are relatively low, improves unit gasification of coal reserves；
3. when the technical program produces owing to have employed the many gasification unit of coal underground gasifying technology system, the position arrangement that gasification unit is adjacent with relative, it is possible not only to make full use of adjacent cells, the conjugation burning of confrontation unit, increase horizontal pneumatization and longitudinal pneumatization, expand high permeability zones simultaneously, again extend laterally gasification width and longitudinally gasification height, increase gasification of coal reserves, and reduce gas piping cost by the shared of gas exit, reduce the required boring in gasification zone number simultaneously, greatly reduce cost, as shown in Figure 4, former horizontal gasification zone 4 expands pneumatization 7 after using the arrangement of this patent gasification unit；
4. the technical program sets up steam ascending pipe owing to have employed boring stay tube outer wall in the bottom of obturator, boring stay tube is applied not only to support boring, prevent subsiding and destroying of boring, and may be used for the injection of steam, while effectively utilizing pipeline, enhance gasification reaction, improve gas quality.
5. the technical program is owing to have employed sealing device threaded gasification ascending pipe, and sets the fixing of wing support member auxiliary gasifying agent ascending pipe, and wing support member can protect gasifying agent ascending pipe outer wall thread, prevents it from wearing and tearing, it is ensured that obturation effect；Wing support member is provided with opening and closing mouth, detachably, recycling, low cost；Threaded and wing support member is set every 15-30 rice, the problem solving injection point backing, easy and simple to handle；The retrogressing that gas injection simultaneously is selected makes gasifying agent ascending pipe, incendiary agent ascending pipe etc. to burn, repeatable utilization.
6. the technical program is owing to have employed the frame mode that incendiary agent ascending pipe is placed in pipe by gasifying agent ascending pipe, avoid the mixing of incendiary agent and oxidant, improve the safety of ignition process, and incendiary agent ascending pipe gas outlet is shorter than gasifying agent ascending pipe, ensure that burning gases are fully contacted with oxygen, improve efficiency of combustion, avoid burning gases loss simultaneously, improve the safety of gasification.
7. the technical program is provided with spontaneous combustion agent ascending pipe branch and the structure of inflammable compound ascending pipe branch owing to have employed incendiary agent ascending pipe entrance, in ignition process, gasifying agent and pyrophoric gas can be initially injected, inflammable gas it is passed through after igniting, turn off pyrophoric gas, while standing pilot coal seam, save igniting cost, it is ensured that the safety of ignition process is carried out.
With embodiment, the present invention is described in detail below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is no-shaft underground gasification system schematic perspective view of the present invention；
Fig. 2 is the present invention single gasification unit gasification tunnel schematic diagram；
Fig. 3 is gasification unit of the present invention arrangement schematic diagram；
Fig. 4 is the status architecture schematic diagram during work of gasification zone of the present invention；
Fig. 5 is the overall structure schematic diagram of no-shaft underground gasification system of the present invention；
Fig. 6 is without well formula underground coal gasification(UCG) igniting and injection point backing device enlarged diagram in Fig. 1；
Fig. 7 is obturator duty of the present invention positive TV structure enlarged diagram；
Fig. 8 is line A-A section plan structure enlarged diagram in Fig. 3；
Fig. 9 is that the present invention works front wing supporting piece structure enlarged diagram；
Figure 10 is ignition point mobile device structure enlarged diagram of the present invention.
Detailed description of the invention
Embodiment
A kind of coal underground gasifying technology system embodiment, if Fig. 1 is to shown in 10, this underground gasification system includes gasifying agent injection hole 1, gas exit boring 2, trunk gasification tunnel 3, branch's gasification tunnel 5, boring stay tube 8, gasifying agent ascending pipe 9, incendiary agent ascending pipe 10, sealing device 11 and ignition point mobile device 12.As it is shown in figure 1, described gasifying agent injection hole 1 and gas exit boring 2 vertically pierce coal seam, until required gasification bottom；Described trunk gasification tunnel 3 one end connects gasifying agent injection hole 1, and the other end is divided into Liang Tiao branch gasification tunnel 5, and the other end of Liang Tiao branch gasification tunnel 5 respectively connects a gas exit boring 2, forms a gasification unit；As it is shown in figure 5, stay tube 8 outer wall is propped up in described boring is provided with steam ascending pipe 8-1 in the bottom of obturator 11；Described incendiary agent ascending pipe 10 is placed in pipe by gasifying agent ascending pipe 9, and is connected with gasifying agent ascending pipe 9 by screw thread 13 or is welded；Described 9 drilled stay tubes of gasifying agent ascending pipe 8 are placed in pipe, and realize fixing with the connection of boring stay tube 8 and sealing by obturator 11；As shown in Figure 7, described obturator 11 includes upper flange 11-1, lower flange 11-2, pad 11-3 and bolt 11-4, connect fixing gasifying agent ascending pipe 9 by screw thread 11-11, and set the fixing of wing support member 11-5 auxiliary gasifying agent ascending pipe 9 and the sealing function of sealing device 11；As shown in Fig. 5 and Figure 10, described ignition point mobile device 12 is located between gasifying agent ascending pipe 9 and incendiary agent ascending pipe 10 junction point and obturator 11, including runner 12-1, rotating shaft 12-2 and bracing frame 12-3.
In embodiment, described gasifying agent injection hole 1 and gas exit 2 vertical dimensions of holing are 400-800 rice；The spacing of two gas exit borings 2 of described gasification unit is the most maximum gasification distance of 1 gasification unit, and scope is 15-30 rice.
In embodiment, described gasification unit Zhong Liangge branch gasification tunnel 5 is equal with trunk gasification tunnel 3 angle, and angle α is 45 °.
In embodiment, when the described many gasification unit of coal underground gasifying technology system produce, the arrangement of gasification unit includes adjacent and relative two parts, as it is shown on figure 3, adjacent part, gasification unit a, b are parallel, and shares a gas exit boring；Opposite segments, two gasification unit of a, c are symmetrical about two gas exits, 2 place straight lines of holing, and share two gas exits borings 2 simultaneously.If gasification zone is relatively big, then can share gasifying agent inlet boring 1.
In embodiment, it is floral tube that described boring props up stay tube 8 at gasification of coal layer segment.
In embodiment, as it is shown in figure 5, described gasifying agent ascending pipe 9 sets up temperature point 9-3 at the gasifying agent ascending pipe outlet inclined upstream position of 9-2.
In embodiment, described gasifying agent ascending pipe 9 outer wall sets external screw thread 9-1 and wing support member 11-5 every 15-30 rice, as shown in Figure 9, wing support member 11-5 top loop connecting 11-51 is fixed on gasifying agent ascending pipe 9 outer wall in the way of female thread, and bottom is folded to gasifying agent ascending pipe 9 tube wall but does not fixes；Described wing support member 11-5 includes that two wing support chip 11-52, wing support chip 11-52 are square or semicircle, and between two wing support chip 11-52, ring-type place sets up opening and closing mouth 11-53.
In embodiment, as it is shown in fig. 7, described sealing device upper flange 11-1 is provided with female thread 11-11, mate with gasifying agent ascending pipe 9 outer wall external screw thread 9-1, as shown in Figure 8, described lower flange 11-2 sets two groove 11-21 relative to position, the described groove 11-21 width width more than wing support member 11-5.
In embodiment, as it is shown in figure 9, described incendiary agent ascending pipe 10 is more slightly shorter than gasifying agent ascending pipe at gas outlet, i.e. incendiary agent ascending pipe outlet 10-3 is included in gasifying agent ascending pipe outlet 9-2, gasifying agent ascending pipe outlet 9-2 is ignition point 6, is positioned at the point of intersection of Liang Tiao branch gasification tunnel.
In embodiment, as it is shown in figure 1, described incendiary agent ascending pipe 10 entrance is provided with spontaneous combustion agent ascending pipe branch 10-1 and inflammable compound ascending pipe branch 10-2.
According to the structure of above-mentioned underground coal gasification system, the production craft step of underground gasification is as follows:
A. Directional Drilling is utilized vertically to drill gasifying agent injection hole 1 and gas exit boring 2, horizontal drilling trunk gasification tunnel 3 and branch's gasification tunnel 5, through gasifying agent injection hole 1 and gas exit boring 2；Incendiary agent ascending pipe 10 is inserted in gasifying agent ascending pipe 9, is connected by screw thread 13 and incendiary agent ascending pipe 10 and gasifying agent ascending pipe 9 are fixed.
B. the sleeve pipe of incendiary agent ascending pipe 10 and gasifying agent ascending pipe 9 is put into boring stay tube 8, after arriving down ignition point 6, lower flange 11-2 is enclosed within first wing support member 11-5 bottom, again sleeve pipe is down pressed, as shown in Figure 7, until wing support chip 11-52 is launched into level, it is stuck in lower flange 11-2 top.
C. pad 11-3 is placed on upper flange 11-1, puts upper flange 11-1, rotate upper flange 11-1, make upper flange 11-1 intact with telescopic joint, and fixed by bolt 11-4.
D. injecting steam into pipe 8-1, gasifying agent ascending pipe 9, inflammable gas ascending pipe branch 10-2, pyrophoric gas ascending pipe branch 10-1 connect respective gas, and are closed.
E. open inflammable gas ascending pipe branch 10-2 switch, close after purging incendiary agent ascending pipe 10.
F. open pyrophoric gas ascending pipe branch 10-1 switch, gasifying agent ascending pipe 9 is passed through pure oxygen/air, at ignition point, pyrophoric gas contact oxygen after-combustion, it is achieved igniting.
G. after lighting a fire successfully, open inflammable gas ascending pipe branch 10-2 switch, be passed through inflammable gas, and close pyrophoric gas switch, make ignition point sustained combustion, coal seam of igniting.
H. after the temperature of temperature point 9-3 reaches more than 400 degree, coal seam is ignited successfully, closes inflammable gas switch.
I., after the temperature of temperature point 9-3 reaches more than 800 degree, open steam ascending pipe 8-1, be passed through steam.
J. when the temperature of temperature point 9-3 reaches below 600 degree, close steam ascending pipe 8-1, turn pine obturator upper flange 11-1, starting ignition point mobile device 12, open the opening and closing mouth 11-53 of wing support member 11-5, take off wing support member 11-5, by sleeve pipe toward when pulling on to next wing support member 11-5 bottom, again sleeve pipe is down pressed, it is achieved the retrogressing of burning.
Explode to prevent coal gas during underground gasification to be gathered in gasification tunnel, steam can be continually fed into by steam ascending pipe in gasification, can also discontinuously inject steam in gasifying agent ascending pipe, make steam and gasifying agent be mixed into gasification tunnel.
K. step i, j are returned to, until coal combustion point moves to the gasification tunnel end.
Claims (10)
1. a coal underground gasifying technology system, it is characterised in that described underground gasification system includes that gasifying agent is noted
Entering boring, gas exit is holed, trunk gasification tunnel, branch's gasification tunnel, boring stay tube, and gasifying agent is noted
Enter pipe, incendiary agent ascending pipe, sealing device and ignition point mobile device；Described gasifying agent injection hole and coal gas
Exit bore vertically pierces coal seam, until required gasification bottom；Described trunk gasification tunnel one end connects gas
Agent injection hole, the other end connects Liang Tiao branch gasification tunnel, and the other end of Liang Tiao branch gasification tunnel respectively connects
Connect a gas exit boring, form a gasification unit；Described boring props up stay tube outer wall under obturator
Portion is provided with steam ascending pipe；Described incendiary agent ascending pipe is placed in pipe by gasifying agent ascending pipe, notes than gasifying agent
Enter to manage slightly shorter, be threaded connection with gasifying agent ascending pipe or weld；Drilled of described gasifying agent ascending pipe
Stay tube is placed in pipe, and realized by obturator and gasifying agent injection hole prop up the connection of stay tube fix and
Seal；Described obturator includes upper flange, lower flange, pad and bolt, is threaded connection fixing gasification
Agent ascending pipe, and set the fixing of wing support member auxiliary gasifying agent ascending pipe and the sealing function of sealing device；Institute
State ignition point mobile device to be located between gasifying agent ascending pipe and incendiary agent ascending pipe junction point and obturator, bag
Include runner, rotating shaft and bracing frame.
A kind of coal underground gasifying technology system, it is characterised in that described gasifying agent
Injection hole is 400-800 rice with gas exit boring vertical dimension；Two gas exits of described gasification unit bore
The spacing in hole is the most maximum gasification distance of 1 gasification unit, and scope is 15-30 rice.
A kind of coal underground gasifying technology system, it is characterised in that described gasification list
Yuan Zhongliangtiao branch gasification tunnel is equal with trunk gasification tunnel angle, and angle α is 45 °.
A kind of coal underground gasifying technology system, it is characterised in that described coal ground
When the many gasification unit of gasified process system produce, the arrangement of gasification unit includes adjacent and relative two parts, phase
Adjacent part, each gasification unit is parallel, and shares a gas exit boring；Opposite segments, two gasifications are single
Unit is symmetrical about two gas exit boring place straight lines, shares two gas exit borings simultaneously；If gasification zone
Relatively big, then can share the boring of gasifying agent inlet.
A kind of coal underground gasifying technology system, it is characterised in that: described boring is propped up
Stay tube is floral tube at gasification of coal layer segment.
A kind of coal underground gasifying technology system, it is characterised in that described gasifying agent
Ascending pipe upstream position partially outside gasifying agent ascending pipe outlet tube wall sets up temperature point.
A kind of coal underground gasifying technology system, it is characterised in that described gasifying agent
Ascending pipe outer wall sets external screw thread and wing support member every 15-30 rice, within the loop connecting of wing support member top
The mode of screw thread is fixed on gasifying agent ascending pipe outer wall, and bottom is folded to gasifying agent ascending pipe tube wall but does not fixes；
Described wing support member includes two wing support chips, and support chip is square or semicircle, two wing support chips
Between ring-type place set up opening and closing mouth.
A kind of coal underground gasifying technology system, it is characterised in that described sealing fills
Putting upper flange and be provided with female thread, mate with gasifying agent ascending pipe outer wall external screw thread, described lower flange sets relative to position
Two grooves, described recess width is more than the width of wing support member.
A kind of coal underground gasifying technology system, it is characterised in that described incendiary agent
Ascending pipe entrance is provided with spontaneous combustion agent ascending pipe branch and inflammable compound ascending pipe branch.
A kind of coal underground gasifying technology system that the most according to claim 1, system realizes, it is characterised in that
The processing step that gasification produces is as follows:
A. utilizing Directional Drilling vertically to drill gasifying agent injection hole and gas exit boring, the gasification of horizontal drilling trunk is logical
Road and branch's gasification tunnel, through gasifying agent injection hole and gas exit boring；Incendiary agent ascending pipe is inserted in
Gasifying agent ascending pipe, is threaded connection and incendiary agent ascending pipe and gasifying agent ascending pipe is fixed；
B. the sleeve pipe of incendiary agent ascending pipe and gasifying agent ascending pipe is put into boring stay tube, lower to the gasification of Liang Tiao branch
After the point of intersection of passage, lower flange is enclosed within first wing support member bottom, then sleeve pipe is down pressed, until
Wing support chip is launched into level, is stuck in lower flange top；
C. pad is placed on upper flange, puts upper flange, rotate upper flange, make upper flange intact with telescopic joint,
And be bolted；
D. injecting steam into pipe, gasifying agent ascending pipe, inflammable gas ascending pipe branch, pyrophoric gas ascending pipe divides
Prop up and connect respective gas, and be closed；
E. open inflammable gas ascending pipe branch switch, close after purging incendiary agent ascending pipe；
F. open pyrophoric gas ascending pipe branch switch, gasifying agent ascending pipe is passed through pure oxygen/air, note at incendiary agent
Enter at the pipe mouth of pipe, pyrophoric gas contact oxygen after-combustion, it is achieved igniting；
G., after lighting a fire successfully, open inflammable gas ascending pipe branch switch, be passed through inflammable gas, and close from combustion gas
Body switchs, and makes ignition point sustained combustion, coal seam of igniting；
H. after the temperature of temperature point reaches more than 400 degree, coal seam is ignited successfully, closes inflammable gas switch；
I., after the temperature of temperature point reaches more than 800 degree, open steam ascending pipe, be passed through steam；
J. when the temperature of temperature point reaches below 600 degree, close steam ascending pipe, turn method on pine obturator
Orchid, starting ignition point mobile device, open the opening and closing mouth of wing support member, take off wing support member, by sleeve pipe
Toward when pulling on to next wing support member bottom, then sleeve pipe is down pressed, it is achieved the retrogressing of burning；
It is continually fed into steam by steam ascending pipe, it is also possible in gasifying agent ascending pipe in gasification
Discontinuously inject steam, make steam and gasifying agent be mixed into gasification tunnel；
K. step i, j are returned to, until coal combustion point moves to the gasification tunnel end.
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