CN101382065A - Well-less underground gasification process - Google Patents

Abstract

Translated fromChinese

本发明提供一种无井式地下气化工艺。本工艺主要包括“L”型气化炉的构建和气化生产两个阶段，定向钻贯通1～6号钻孔，形成“一”线炉，火力贯通5～9号钻孔形成“一”线炉，二者共同组成“L”型炉。贯通后，在5号孔点火，利用火力扩孔的方式形成1～5气化通道，作为出气列。利用火力贯通方式形成5～9气化通道作为气化列。并在气化不能达到要求时，补加钻孔进行扩展。此种工艺可以缩短施工周期，保护钻孔，有利于地下气化的稳定。

The invention provides a well-free underground gasification process. This process mainly includes two stages of "L" type gasification furnace construction and gasification production. Directional drilling penetrates No. 1 to No. 6 boreholes to form a "first" line furnace, and fire power penetrates No. 5 to No. 9 boreholes to form a "first" line Furnace, the two together form an "L"-shaped furnace. After piercing through, ignite in the No. 5 hole, and form 1-5 gasification channels by means of fire expansion, as the gas outlet row. 5-9 gasification passages are formed as gasification columns by means of fire penetration. And when the gasification can not meet the requirements, add drilling to expand. This technology can shorten the construction period, protect the borehole, and is conducive to the stability of underground gasification.

Description

Translated fromChinese

无井式地下气化工艺Well-less underground gasification process

技术领域technical field

本发明涉及煤炭地下气化领域，特别涉及无井式地下气化工艺。The invention relates to the field of underground coal gasification, in particular to a wellless underground gasification process.

背景技术Background technique

煤炭地下气化的工艺过程，是借助于从地面向煤层打钻孔，和在钻孔间沿煤层开拓气化通道而形成的。根据准备煤层的方式不同，地下气化分为无井式、有井式、综合式三种。其中有井式地下气化，需要人工开拓气化通道，建炉周期长，避免不了地下劳动。而无井式地下气化工艺消除了地下作业，对环境无公害，施工周期短。无井式地下气化的贯通方法主要有空气火力渗透法、电力贯通法、定向钻进法、水力压裂法等。本工艺采用定向钻进和火力贯通相结合的方式开拓气化通道，具有适应性广，灵活性好等特点，能进行推广。The process of underground coal gasification is formed by drilling holes from the ground to the coal seam, and opening gasification channels along the coal seam between the drill holes. According to different ways of preparing coal seams, underground gasification can be divided into three types: no well type, well type, and comprehensive type. Among them is well-type underground gasification, which requires manual development of gasification channels, and the furnace construction period is long, so underground labor cannot be avoided. The well-less underground gasification process eliminates underground operations, has no pollution to the environment, and has a short construction period. The penetration methods of wellless underground gasification mainly include air fire penetration method, electric power penetration method, directional drilling method, hydraulic fracturing method, etc. This process adopts the combination of directional drilling and fire penetration to open up gasification channels, which has the characteristics of wide adaptability and good flexibility, and can be popularized.

为了能够对各种不同赋存条件的煤层气化过程实现有效控制，必须针对不同的煤层赋存条件，采用不同气化炉结构。几十年来，发展了多种炉型，从进、排气点和气化通道相对位置来分可把它们分为几种基本炉型，即一线炉、V形炉、盲孔炉、U形炉等，在这几种基本炉型的基础上，后来又发明了几种炉型，如后退式供风(CRIP)气化炉、多孔气化炉、具有可控转换供风点的气化炉和长壁炉等。In order to be able to effectively control the coalbed gasification process of various coal seam occurrence conditions, different gasifier structures must be adopted for different coal seam occurrence conditions. For decades, a variety of furnace types have been developed, and they can be divided into several basic furnace types from the relative positions of the inlet and exhaust points and the gasification channel, namely, one-line furnace, V-shaped furnace, blind hole furnace, and U-shaped furnace. etc. On the basis of these basic furnace types, several furnace types were invented later, such as retreating air supply (CRIP) gasifier, porous gasifier, gasifier with controllable switching air supply point and long fireplace etc.

国外无井式地下气化工艺主要研究方向是受控注入点后退气化工艺(CRIP)。这种新工艺把定向钻进和反向燃烧结合在一起，钻孔打完后在钻孔内下套管；开始气化时，用移动点火器在靠近产气孔的第一个注入点烧掉一段套管，并点燃煤体，燃烧空穴不断扩展，一直烧到煤层顶板，待顶板开始塌落时，注入点后退相当于一个空穴宽度的距离，再用点火器烧掉一段套管，形成新的燃烧带，如此逐段向垂直注入孔推进。点火器用引火气体硅烷点燃丙烷喷嘴，在地面拖曳移动。该工艺需要地面的机械装置，在煤层埋深很大的情况下，很难保证点火器的顺利拖动，不能保证点火的可靠性。The main research direction of foreign well-free underground gasification technology is the controlled injection point retreat gasification process (CRIP). This new technology combines directional drilling and reverse combustion. After the drilling is completed, the casing is run in the borehole; when the gasification starts, a mobile igniter is used to burn the gas at the first injection point near the gas production hole. A section of casing is used to ignite the coal body, and the combustion cavity continues to expand until it reaches the roof of the coal seam. When the roof begins to collapse, the injection point retreats a distance equivalent to the width of a cavity, and then burns a section of casing with an igniter , forming a new combustion zone, which advances to the vertical injection hole section by section. The igniter ignites the propane nozzle with silane, the pilot gas, and drags it across the ground. This process requires mechanical devices on the ground, and it is difficult to ensure the smooth dragging of the igniter when the coal seam is deeply buried, and the reliability of ignition cannot be guaranteed.

为了研发更可靠的地下气化工艺，特发明了新的工艺，本发明为无井式地下气化工艺，主要解决炉区布置和扩展方式。该工艺包括“L”型气化炉的构建和后续的生产两个过程。In order to develop a more reliable underground gasification process, a new process has been invented. This invention is a wellless underground gasification process, which mainly solves the layout and expansion of the furnace area. The process includes two processes, the construction of the "L" type gasifier and the subsequent production.

发明内容Contents of the invention

本发明针对现有技术的不足，主要解决炉区布置和扩展方式等问题，包括：无井式地下气化炉的布置，设计，施工问题；气化炉的扩展等。通过先进技术的应用，可缩短施工周期，提高气化的稳定性和可靠性。The present invention aims at the deficiencies of the prior art, and mainly solves problems such as layout and expansion of the furnace area, including: the layout, design and construction of the wellless underground gasifier; the expansion of the gasifier, etc. Through the application of advanced technology, the construction period can be shortened, and the stability and reliability of gasification can be improved.

本工艺主要包括“L”型气化炉的构建和气化生产两个阶段，其主要特征在于气化炉由定向钻形成“一”线炉，然后火力扩大定向钻形成出气列，火力贯通形成“一”线炉即气化列共同组成，气化炉形成后，气化的主要方法和气化炉的扩大生产。This process mainly includes two stages of "L" type gasification furnace construction and gasification production. Its main feature is that the gasification furnace is formed by directional drilling to form a "first" line furnace, and then the fire power is enlarged to form a gas outlet row by directional drilling, and the fire power is penetrated to form a " A "line furnace is composed of gasification trains. After the gasification furnace is formed, the main method of gasification and the expansion of production of the gasification furnace.

所述的定向钻形成“一”线炉，首先布置间距为10～60米不同距离的若干直钻孔，编号为1、2、3、4、5、6号孔，地势低的6号孔为排水孔，1、5号孔为主进、出气孔，定向钻位置在煤层底板上0.5米～2.0米，用定向钻将1、2、3、4、5、6贯通，形成气化通道。The directional drilling described above forms a "one" line furnace. First, a number of straight drilling holes with different distances of 10 to 60 meters are arranged, numbered asholes 1, 2, 3, 4, 5, and 6, and thenumber 6 hole is low-lying. It is a drainage hole, No. 1 and No. 5 holes are the main inlet and outlet holes, and the directional drilling position is 0.5m to 2.0m on the coal seam floor. Use directional drilling to connect No. 1, 2, 3, 4, 5, and 6 to form a gasification channel .

所述的火力贯通形成“一”线炉，预先打若干垂直钻孔，距离为10～30米，在其中一个钻孔点火，与其相邻的钻孔鼓入高压空气，压力为2.0MPa～4.0MPa，高压空气通过煤层的裂隙进入点火钻孔，逐步将火区引到鼓风钻孔，形成气化通道。The fire power is connected to form a "one" line furnace, and several vertical boreholes are drilled in advance with a distance of 10-30 meters. Ignition is carried out in one of the boreholes, and high-pressure air is blown into the adjacent borehole with a pressure of 2.0MPa-4.0 MPa, high-pressure air enters the ignition borehole through the cracks in the coal seam, and gradually leads the fire area to the blast borehole to form a gasification channel.

本工艺的技术方案是这样实现的：The technical scheme of this technology is realized like this:

定向钻形成“一”线炉，首先布置间距为10～60米不同距离的若干直钻孔，编号为1、2、3、4、5、6号孔，地势低的6号孔为排水孔，1、5号孔为主进、出气孔，用定向钻将1、2、3、4、5、6贯通，形成气化通道。Directional drilling forms a "one" line furnace. First, arrange several straight drilling holes with different distances from 10 to 60 meters, numberedholes 1, 2, 3, 4, 5, and 6, and the low-lying hole No. 6 is a drainage hole , No. 1 and No. 5 holes are the main inlet and outlet holes, and 1, 2, 3, 4, 5, and 6 are penetrated with directional drills to form gasification channels.

定向钻形成“一”线炉后，测量5号孔水位，若有积水不能点火，通过6号孔进行排水，然后在5号孔进行点火，通常采用投入炽热的焦炭点火。After the directional drilling forms the "first" line furnace, measure the water level in the No. 5 hole. If there is accumulated water and cannot be ignited, drain the water through the No. 6 hole, and then ignite it in the No. 5 hole. Usually, it is ignited by putting hot coke into it.

点火成功后，向5号孔通入大量的空气，空气流量800～1500Nm³/h，扩展孔底的火源。After the ignition is successful, a large amount of air is introduced into the No. 5 hole, the air flow rate is 800-1500Nm³ /h, and the fire source at the bottom of the hole is expanded.

由于定向钻不能打大直径的孔，故需要将打好的钻孔进行火力扩大，为气化准备条件。通过4号孔进气，5号孔出气，反向燃烧的方式，将钻孔通过火力方法进行扩大，当火焰到达4号井时，采用3号井进气，将通过火力扩孔至3号孔底；按照此种方法，将1～5号孔的定向钻进行火力扩大。Since directional drilling cannot drill large-diameter holes, it is necessary to expand the firepower of the drilled holes to prepare for gasification. Intake air through No. 4 hole, exit No. 5 hole, and use reverse combustion to expand the drill hole through firepower. When the flame reaches No. 4 well, use No. 3 well to enter the air, and expand the hole to No. 3 through firepower Bottom of the hole; according to this method, the directional drilling of No. 1 to No. 5 holes is expanded.

在1～5号孔进行火力扩孔的过程中，在7号孔通入高压空气，进行高压空气火力贯通，压力为2.0MPa～4.0MPa，优选采用压力3.0MPa。5～7号之间形成气化通道后，在8号孔通入高压空气，进行7～8号孔之间的气化通道的贯通，按照火力贯通的方法将5～9号孔进行贯通，形成一个气化通道。In the process of thermal reaming in No. 1-5 holes, high-pressure air is introduced into No. 7 hole to carry out high-pressure air fire penetration. The pressure is 2.0MPa-4.0MPa, preferably 3.0MPa. After the gasification channel is formed between No. 5 and No. 7, high-pressure air is introduced into No. 8 hole to penetrate the gasification channel between No. 7 and No. 8 holes, and No. 5 to No. 9 holes are penetrated according to the fire penetration method A gasification channel is formed.

从9号孔进行鼓风，7、8号孔和1～5线性炉的各钻孔作为出气孔，6号孔作为排水孔，排除气化炉中的多余水分。Blow air from No. 9 hole, No. 7, No. 8 holes and each drilled hole of 1-5 linear furnaces are used as air outlet holes, and No. 6 hole is used as a drainage hole to remove excess water in the gasifier.

在进行生产的过程中，本发明还可以进行气化炉的扩展。具体方式有两种，一种是采用反向气化方式，沿7～9相同的方向打第一排钻孔，每排钻孔间距为10～30米，并在生产的过程中，将第1排钻孔与7～9号孔进行贯通，当生产的煤气质量不能满足甲醇生产要求时，从第1排钻孔进气，7、8、9号及1～5号各钻孔进行排气，在第1排钻孔投入使用后，打第2排钻孔，并进行贯通，按照此种方法依次进行气化，逐步把整个气化盘区的煤进行气化。During the production process, the present invention can also expand the gasifier. There are two specific ways, one is to use the reverse gasification method, drill the first row of drill holes along the same direction as 7-9, and the distance between each row of drill holes is 10-30 meters, and in the process of production, the first row of drill holes The first row of boreholes connects with No. 7-9 holes. When the quality of the gas produced cannot meet the requirements of methanol production, the gas will be fed from the first row of boreholes, and No. 7, 8, 9 and No. 1-5 holes will be exhausted After the first row of drilling holes is put into use, the second row of drilling holes is drilled and penetrated. According to this method, the gasification is carried out in sequence, and the coal in the entire gasification panel is gradually gasified.

另一种为正向气化，选择从7、8、9号钻孔进行鼓风，从第1排钻孔出气，实现正向气化，在气化过程中，打第2排钻孔，并实现与第1排钻孔的贯通，当生产煤气不能满足标准时，从第1排钻孔进气，第2排钻孔出气，根据生产甲醇和产量的需要依次打第3排、4排钻孔，直至将整个气化盘区的煤进行气化。The other is forward gasification, choose to blow air from No. 7, 8, and 9 drill holes, and discharge gas from the first row of drill holes to realize forward gasification. During the gasification process, drill the second row of drill holes. And to realize the connection with the first row of drill holes, when the production gas cannot meet the standard, the first row of drill holes will be used for air intake, the second row of drill holes for gas outlet, and the third and fourth rows of drill holes will be drilled sequentially according to the needs of methanol production and output holes until the coal in the entire gasification panel is gasified.

进行气化炉的扩展，反向气化有利于气化通道的形成，保护出气列。正向气化，可以对煤层进行预热，提高煤气的质量，气化时，采用正向气化或反向气化中的任意一种或两种方法交换使用均可。但由于一种方法通常满足不了用气要求，因此，优选两种方法交换使用。The expansion of the gasifier, the reverse gasification is conducive to the formation of the gasification channel and protects the gas outlet column. Forward gasification can preheat the coal seam and improve the quality of coal gas. During gasification, any one of forward gasification or reverse gasification can be used or both methods can be used interchangeably. However, because one method usually cannot meet the gas requirements, it is preferable to use the two methods interchangeably.

本发明与已有技术相比达到的有益效果是，采用定向钻进的方式连通钻孔，并用火力贯通的方法将钻孔扩大，作为出气列，缩短了施工期，保护钻孔的稳定性，采用火力贯通的方式形成气化列，能形成稳定的火区，保证气化的稳定，能提高气化炉的产量，减少顶板塌落的影响。所采用的气化炉布置、结构和扩展有利于气化的稳定和长期进行，有利于无井式气化的工业性生产。Compared with the prior art, the beneficial effect of the present invention is that the boreholes are connected by means of directional drilling, and the boreholes are expanded by the method of fire penetration, which is used as a gas outlet column, which shortens the construction period and protects the stability of the boreholes. The gasification column is formed by means of fire penetration, which can form a stable fire area, ensure the stability of gasification, increase the output of the gasifier, and reduce the impact of roof collapse. The adopted gasifier layout, structure and expansion are conducive to the stable and long-term gasification, and are beneficial to the industrial production of well-free gasification.

附图说明Description of drawings

图1为L型气化炉平面布置图。Figure 1 is a plan layout of an L-shaped gasifier.

图2为定向钻进剖面图。Figure 2 is a sectional view of directional drilling.

图3为气化炉的扩展图。Figure 3 is an expanded view of the gasifier.

图中，1、5、9-主进、出气孔；2、3、4-辅助进、出气孔；6-排水孔；7、8-辅助进出、气孔；10、11、12-水文监测孔；13、14号孔先为测温孔，后可作为辅助进、出气孔；15-煤层；16-煤层底板。In the figure, 1, 5, 9- main inlet and outlet holes; 2, 3, 4- auxiliary inlet and outlet holes; 6- drainage holes; 7, 8- auxiliary inlet and outlet holes; 10, 11, 12- hydrological monitoring holes ;Holes 13 and 14 are temperature measuring holes first, and then can be used as auxiliary inlet and outlet holes; 15-coal seam; 16-coal seam floor.

其中，图1为摘要附图。Among them, Figure 1 is the abstract drawing.

具体实施方式Detailed ways

下面结合附图和实施例对本发明作一详细描述。The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

图1说明了“L”型气化的平面布置图，其中，1、2、3、4、5、6号钻孔由定向钻进行贯通，6号孔为排水孔；5、7、8、9号钻孔由火力贯通。1号孔与贯通口距离190米，1号、2号距离55米，2号、3号距离45米，3号、4号距离25米，4号、5号距离22米，5号、6号距离15米，5号、7号距离24.5米，7号、8号距离24.8米，8#、9#距离12米。其中主进出气孔1、5、9号孔直径325mm，2、3、4、6、7、8、10、11、12、13、14孔径219mm。其中13、14为测温孔，6#为排水孔，10、11、12孔为水文观测孔，监测气化前、中、后对地下水的影响。通过火力贯通的方式将定向钻形成的通道1～5号进行扩大，作为出气列。5号孔点火成功后，向7号孔通入高压空气，压力3.0MPa。空气通过煤层裂隙进入5号孔，火源将向着氧气浓度高的方向移动，并观测过程中压力和组分的变化，当7号孔压力迅速降低，与5号孔相差不大时，标志贯通成功。按照此方法贯通8号、9号钻孔。1～6气化通道和5～9气化通道共同组成“L”型气化炉。Figure 1 illustrates the layout of the "L"-shaped gasification, in which, holes 1, 2, 3, 4, 5, and 6 are penetrated by directional drilling, andhole 6 is a drainage hole;holes 5, 7, 8, Drill hole No. 9 is penetrated by fire. The distance between No. 1 and the through-hole is 190 meters, the distance between No. 1 and No. 2 is 55 meters, the distance between No. 2 and No. 3 is 45 meters, the distance between No. 3 and No. 4 is 25 meters, the distance between No. 4 and No. 5 is 22 meters, and the distance between No. 5 and No. 6 The distance between No. 5 and No. 7 is 15 meters, the distance between No. 5 and No. 7 is 24.5 meters, the distance between No. 7 and No. 8 is 24.8 meters, and the distance between No. 8 and No. 9 is 12 meters. Among them, the diameters of No. 1, No. 5 and No. 9 main air inlet and outlet holes are 325 mm, and the diameters of No. 2, 3, 4, 6, 7, 8, 10, 11, 12, 13 and 14 holes are 219 mm. Among them, 13 and 14 are temperature measuring holes, 6# is a drainage hole, and 10, 11, and 12 holes are hydrological observation holes to monitor the impact on groundwater before, during and after gasification. Through fire penetration, channels No. 1 to No. 5 formed by the directional drill are expanded to serve as gas outlet columns. After the No. 5 hole is successfully ignited, high-pressure air is passed into the No. 7 hole with a pressure of 3.0MPa. Air enters the No. 5 hole through the coal seam fissures, and the fire source will move toward the direction of high oxygen concentration, and observe the changes in pressure and composition during the process. When the pressure of No. 7 hole drops rapidly, which is not much different from that of No. 5 hole, the sign is through. success. According to this method, drill holes No. 8 and No. 9. 1-6 gasification channels and 5-9 gasification channels together form an "L"-shaped gasifier.

图2说明了定向钻与各钻孔的剖面图，在打定向钻时，位置位于煤层底板以上0.5米，以达到煤层的最大利用率。6号排水井要打入煤层底板下10米，并做人工底，用水泥将钻孔底部封住，防止下面泥沙向上涌出。Fig. 2 illustrates the cross-sectional view of directional drilling and each drilling hole. When drilling directional drilling, the position is located 0.5 meters above the coal seam floor, so as to achieve the maximum utilization rate of the coal seam. The No. 6 drainage well shall be drilled 10 meters below the coal seam floor, and shall be made as an artificial bottom, and the bottom of the borehole shall be sealed with cement to prevent the sediment below from gushing upwards.

图3说明了气化炉的扩展，“L”型气化炉结构形成后，从9#进气，1～5号作为出气列，进行气化，当出气质量和产量达不到要求时，沿7～9相同的方向打一排钻孔，钻孔间距10～30米，先采用反向气化方式，将第1排钻孔与7～9通道贯通，贯通后从第一排钻孔进气，7～9，1～5通道出气，按照此种方法，进行布孔，直到将气化盘区煤炭气化完毕。Figure 3 illustrates the expansion of the gasifier. After the formation of the "L"-shaped gasifier structure, the gas is fed from #9, and No. 1 to No. 5 are used as gas outlets for gasification. When the quality and output of the gas outlet cannot meet the requirements, Drill a row of boreholes along the same direction as 7-9, with a drill hole spacing of 10-30 meters. First use the reverse gasification method to connect the first row of boreholes with passages 7-9, and then drill holes from the first row Air intake, 7-9, and 1-5 channel outlet, according to this method, carry out hole layout until the coal gasification of the gasification panel is completed.

当第一排钻孔与7～9通道贯通后，可以从7～9鼓入气化剂，从第一排钻孔出气，进行正向气化，在气化过程中，打第2排钻孔，并实现与第1排钻孔的贯通，当生产煤气不能满足标准时，从第1排钻孔进气，第2排钻孔出气，根据生产甲醇和产量的需要依次打第3排、4排钻孔，直至将整个气化盘区的煤进行气化。When the first row of drill holes is connected with channels 7-9, the gasification agent can be blown in from 7-9, and the gas can be discharged from the first row of drill holes to carry out forward gasification. During the gasification process, the second row of drill holes can be drilled. holes, and realize the connection with the first row of drilled holes. When the production gas cannot meet the standard, the first row of drilled holes will be used for air intake, and the second row of drilled holes will be used for gas outlet. According to the needs of methanol production and output, the third and fourth rows will be drilled in sequence. Drill holes in a row until the coal in the entire gasification panel is gasified.

Claims (10)

Translated fromChinese

1.一种无井式地下气化工艺，其特征在于，定向钻贯通1～6号钻孔，形成“一”线炉，火力贯通5～9号钻孔形成“一”线炉，二者共同组成“L”型炉。1. A wellless underground gasification process, characterized in that the directional drilling penetrates No. 1 to No. 6 boreholes to form a "first" line furnace, and the firepower penetrates No. 5 to No. 9 boreholes to form a "first" line furnace. Together they form an "L" shaped furnace.2.根据权利要求1所述的无井式地下气化工艺，其特征在于，1～6号钻孔距离为10～60米，5～9号钻孔距离10～30米。2. The well-less underground gasification process according to claim 1, characterized in that the distance of No. 1-6 boreholes is 10-60 meters, and the distance of No. 5-9 boreholes is 10-30 meters.3.根据权利要求1所述的无井式地下气化工艺，其特征在于，定向钻贯通1～6号钻孔，定向钻位置在煤层底板上0.5米～2.0米。3. The wellless underground gasification process according to claim 1, characterized in that the directional drilling runs through No. 1 to No. 6 boreholes, and the directional drilling position is 0.5 to 2.0 meters on the coal seam floor.4.根据权利要求1所述的无井式地下气化工艺，其特征在于，1、5、9号钻孔为主进出气孔，6号孔为排水孔，13、14号孔为测温孔，10、11、12号孔为水文观测孔。4. The wellless underground gasification process according to claim 1, characterized in that boreholes No. 1, 5, and 9 are main air inlet and outlet holes, hole No. 6 is a drainage hole, and holes No. 13 and 14 are temperature measuring holes , Holes 10, 11, and 12 are hydrological observation holes.5.根据权利要求1所述的无井式地下气化工艺，其特征在于，进行火力贯通时，所用压力为2.0～4.0MPa。5 . The wellless underground gasification process according to claim 1 , characterized in that, when the fire power penetration is performed, the pressure used is 2.0-4.0 MPa.6.根据权利要求1所述的无井式地下气化工艺，其特征在于，定向钻形成“一”线炉后，测量5号孔水位，若有积水不能点火，通过6号孔进行排水。6. The wellless underground gasification process according to claim 1, characterized in that after the directional drilling forms the "one" line furnace, measure the water level in the No. 5 hole, and if there is accumulated water and cannot be ignited, drain the water through the No. 6 hole .7.根据权利要求1所述的无井式地下气化工艺，其特征在于，通过反向燃烧的方式，对定向钻进行火力扩大。7. The wellless underground gasification process according to claim 1, characterized in that the directional drilling is expanded by means of reverse combustion.8.根据权利要求1所述的无井式地下气化工艺，其特征在于，从9号孔进行鼓风，7、8号孔和1～5线性炉的各钻孔作为出气孔，6号孔作为排水孔，排除气化炉中的多余水分。8. The wellless underground gasification process according to claim 1, characterized in that blasting is carried out from hole No. 9, holes No. 7 and 8 and each borehole of linear furnaces 1 to 5 are used as air outlets, and No. 6 holes are used as air outlets. The holes act as drain holes to remove excess moisture from the gasifier.9.根据权利要求1～8所述的任意一种无井式地下气化工艺，其特征在于，气化炉的扩展采用正向气化或反向气化中的一种或两种。9. The wellless underground gasification process according to any one of claims 1-8, characterized in that, the expansion of the gasifier adopts one or both of forward gasification and reverse gasification.10.根据权利要求9所述的无井式地下气化工艺，其特征在于，气化炉的扩展采用正向气化和反向气化两种方法交换使用。10. The wellless underground gasification process according to claim 9, characterized in that, the expansion of the gasifier adopts two methods of forward gasification and reverse gasification to be used interchangeably.

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