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Compensation method for expanding with heat and contracting with cold of underground gasifying furnace perforated pipe

A technology of underground gasification, thermal expansion and cold contraction, applied in the direction of coal gasification, underground mining, construction, etc., can solve the problems of high price, unbearable compensator, large compensation amount, etc., and achieve the effect of high price

Inactive Publication Date: 2005-02-23
新汶矿业集团有限责任公司孙村煤矿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the methods to solve the thermal expansion and contraction of the hole tube of the underground gasification furnace are as follows: one is to install a concrete member at the hole to prevent the hole tube from rising and falling, but it is difficult to do; the other is to install a large compensator at the hole , but this method also has major problems, such as the compensator can hardly bear the pressure of the upper pipe network and the gravity of the lower hole pipe, it is difficult to bear a large amount of compensation, and the price is expensive, etc.

Method used

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  • Compensation method for expanding with heat and contracting with cold of underground gasifying furnace perforated pipe
  • Compensation method for expanding with heat and contracting with cold of underground gasifying furnace perforated pipe
  • Compensation method for expanding with heat and contracting with cold of underground gasifying furnace perforated pipe

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Experimental program
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Effect test

Embodiment 1

[0039] Figure 1 shows that when the thickness of the surface soil layer is large, the thickness is > 30m, or the maximum expansion and contraction of the telescopic section S on the hole tube is > 60mm, and there is a quicksand layer and groundwater affecting the drilling project, the intake and exhaust hole pipes of the underground gasifier 4 Installation situation in borehole 8. The inlet and outlet pipes 4 of the underground gasifier are also referred to as the pipes 4 for short.

[0040] The inlet and outlet holes 8 of the underground gasifier are drilled on the ground, and after connecting with the airflow passages 8 at both ends of the underground gasifier, the inlet and outlet pipes 4 are installed along the depth of the entire borehole 8. And pour cement mortar 7 between hole pipe 4 and borehole 8 hole walls. In the process of installing the hole pipe 4, at first according to the geological data of the inlet and outlet boreholes 8, such as: the lithology and thickness...

Embodiment 2

[0052] Figure 9 shows the installation situation of the hole pipe 4 in the borehole 8 when the thickness of the topsoil layer is large, the thickness>30m, or the maximum expansion and contraction of the telescopic section S on the hole pipe>60mm, no quicksand layer and groundwater affect the drilling project. Now, the installation method of bore pipe 4 in borehole 8 is basically the same as that of embodiment 1, the difference is that the installation of sleeve pipe 2 is added outside the upper end of bore pipe 4: the lower end of sleeve pipe 2 will go deep into the surface 3 below the surface. Less than 1m, pour concrete foundation around the casing 2, fix the fixed plate welded on the casing 2 with anchor bolts; the inner wall of the casing 2 is not connected with the hole pipe 4, and reserve The maximum elongation of the telescopic section S on the outlet pipe. At this time, the lower end of the casing 2 does not have to go deep into the bedrock. The bushing 2 shown in the...

Embodiment 3

[0054] Figure 10 shows the installation situation of the bore pipe 4 in the borehole 8 when the thickness of the topsoil layer is small, the total thickness<10m, or the maximum expansion and contraction amount of the telescopic section S on the bore pipe<20mm. The topsoil layer may contain quicksand layer. At this time, because the telescopic section S on the orifice pipe is very small and the fixed section G is relatively upward, the orifice pipe 4 and the ground pipeline 1 can be directly connected without adding a casing 2 . All the other are identical with embodiment 1.

[0055] When the thickness of the surface soil layer is 10-30m, or the maximum expansion and contraction of the telescopic section S on the hole pipe is between 20-60mm, it can be flexibly controlled according to the complexity of the ground pipeline and the temperature of the hole pipe. . When the surface pipeline is complex, the temperature of the hole pipe is high, and the requirements for the uplift ...

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Abstract

The present invention relates to thermal expansion compensating method for perforated pipe of underground gasifying furnace. The air inlet and exhaust pipe is divided into three sections: fixed section, the lower extending section and the upper extending section. The fixed section is set below bedrock and in hard wall rock area and in the length of 10-50% of the pipe and has several fixtures around it. The lower extending section has great extending amount but smaller than the distance between the lower port and the air flow passage base board. The upper extending section to the ground has length dependent on the surface soil layer case. The present invention is used in underground coal gasification, and is simple, safe and reliable.

Description

technical field [0001] The invention relates to an underground coal gasification process, in particular to a method for solving the thermal expansion and contraction of the underground gasification furnace inlet and exhaust hole tubes by setting fixed sections on the inlet and exhaust hole tubes in the underground coal gasification process. Compensation method for thermal expansion and contraction of hole tubes of underground gasification furnace, or called fixed expansion and contraction compensation technology of hole tubes. Background technique [0002] Underground coal gasification technology is a breakthrough in traditional coal mining methods and surface coal gasification technology. Underground coal gasification is carried out in an underground gasifier. Generally speaking, an underground gasifier is composed of three parts: air inlet and exhaust hole, air flow channel, and gasification channel. The air intake and exhaust holes are drilled on the ground; the air flo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/295
Inventor 刘宝银陈传海余力梁杰
Owner 新汶矿业集团有限责任公司孙村煤矿