Efficient energy-saving mine shaft anti-freezing system

Abstract

The present application relates to a kind of high-efficiency energy-saving mine shaft anti-freezing system, comprising: installation in the air intake heat exchanger of return air shaft, installation in the return air shaft heat exchanger of return air shaft bottom, installation in the mine air supply mechanism of mine shaft, installation in the mine shaft wall of the mine shaft inlet position close to mine shaft, the mine shaft heat exchanger of mine shaft, air intake heat exchanger is equipped with first axial fan, second axial fan;Return air shaft heat exchanger is connected with the air outlet of second axial fan by air inlet pipe;The air inlet of mine air supply mechanism is connected with the air outlet of return air shaft heat exchanger by gas conveying hose, and the head of mine air supply mechanism close to mine shaft inlet is provided with multiple third axial fan;The air inlet of mine shaft heat exchanger is equipped with air intake pipe, and the air outlet of mine shaft heat exchanger is equipped with fourth axial fan.The present application is heated after heating external air by high-efficiency utilization of heat in return air to heat mine shaft and prevent freezing.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and in particular to a high-efficiency and energy-saving mine shaft antifreeze system. Background Technology

[0002] In coal mines in northern my country, low ground temperatures in winter cause cold air to easily freeze near the mine shaft entrance, blocking sections of the shaft and affecting the normal operation of mine production equipment. Therefore, coal mining companies use boilers or electric heating to prevent freezing in winter. However, boiler heating consumes a large amount of coal mine energy, and electric heating consumes a large amount of electricity, resulting in high operating costs. Meanwhile, the return air from deep within the mine is at a high temperature, and direct discharge wastes resources. Existing return air utilization methods involve installing conventional heat exchangers on the ground to heat the ground air before blowing it into the mine shaft. However, the return air experiences significant heat loss as it rises in the return air shaft, and the ground-mounted heat exchangers also contribute to heat loss, resulting in low heat utilization efficiency. Therefore, there is a need to develop a mine shaft anti-freezing system that efficiently utilizes the heat in the return air while saving coal mine and electricity. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned problems in the existing technology and provide a high-efficiency and energy-saving mine shaft antifreeze system.

[0004] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0005] A high-efficiency and energy-saving mine shaft antifreeze system includes:

[0006] An air intake heat exchanger is installed at the return air wellhead for primary heat exchange between intake and return air. The air intake heat exchanger is equipped with a first axial flow fan for extracting return air from the return air well and a second axial flow fan for drawing outside air into the air intake heat exchanger.

[0007] A return air shaft heat exchanger is installed at the bottom of the return air shaft to perform secondary heat exchange between the intake and return air. The return air shaft heat exchanger is connected to the air outlet of the second axial flow fan through an intake pipe.

[0008] A mine ventilation system is installed in the mine shaft. The air inlet of the mine ventilation system is connected to the air outlet of the return air shaft heat exchanger through a flexible air supply hose. Multiple third axial flow fans that blow air into the mine shaft to prevent freezing are provided at one end of the mine ventilation system near the mine shaft inlet.

[0009] The mine shaft heat exchanger is installed on the inner wall of the mine shaft near the entrance of the mine shaft, the air inlet of the mine shaft heat exchanger is provided with a wind taking pipe extending to the bottom of the mine shaft for taking return air, and the air outlet of the mine shaft heat exchanger is provided with a fourth axial flow fan for taking return air.

[0010] The air inlet heat exchanger comprises a spindle-shaped outer shell and a barrel-shaped inner shell, the bottom end of the outer shell is installed on the well mouth of the return air shaft, the inner diameter of the opening at the bottom end of the outer shell is larger than the diameter of the well mouth of the return air shaft, the inner shell is located at the center of the outer shell, a plurality of first heat exchange pipes arranged in a ring array are welded between the outer shell and the inner shell, the inside of the inner shell is in communication with the outside of the outer shell through the first heat exchange pipes, the first axial flow fan is installed at the top of the outer shell, the second axial flow fan is installed at the bottom of the inner shell, and the top end of the inner shell is closed.

[0011] The air outlet of the first axial flow fan is provided with a discharge tower for discharging return air at a high altitude, and the air outlet of the fourth axial flow fan is in communication with the discharge tower through an exhaust hose.

[0012] The return air shaft heat exchanger comprises a barrel-shaped air inlet connector and a barrel-shaped air outlet connector, a plurality of second heat exchange pipes arranged in a ring array are welded between the air inlet connector and the air outlet connector in the same return air shaft heat exchanger, the air inlet connector of one return air shaft heat exchanger is screwed with the air outlet connector of another return air shaft heat exchanger when two adjacent return air shaft heat exchangers are assembled, and the air inlet connector of the return air shaft heat exchanger is screwed with the tail of the air inlet pipe when the return air shaft heat exchanger is assembled with the air inlet pipe.

[0013] The air inlet pipe and the return air shaft heat exchanger are respectively provided with movable support frames, the movable support frame comprises an upper support ring, a lower support ring, N support rods arranged in a ring array and N inclined rods arranged in a ring array, the tail of the support rod is hinged to the outer side of the upper support ring, the tail of the inclined rod is hinged to the outer side of the lower support ring, the head of the inclined rod is hinged to the middle part of the support rod, and the head of the support rod is clamped on the inner wall of the return air shaft.

[0014] The mine air supply mechanism comprises a plurality of circular air supply hard pipes, a plurality of reducing tees and a circular cover, the air supply hard pipe is screwed with the adjacent air supply hard pipe, the air supply hard pipe is screwed with the adjacent reducing tee, the cover is screwed on the end of the reducing tee near the entrance of the mine shaft, and the third axial flow fan is installed on the interface on the side of the reducing tee.

[0015] The air supply hard pipe is wrapped with heat preservation cotton.

[0016] The mine shaft heat exchanger comprises multiple hollow heat exchange plates in circular arc shape, a lower adapter and an upper adapter, the hollow heat exchange plates are installed on the inner wall of the mine shaft by expansion bolts, the convex surface of the hollow heat exchange plate is attached to the inner wall of the mine shaft, two adjacent hollow heat exchange plates are connected in a plug-in mode, the lower adapter is installed at the bottom of the hollow heat exchange plate close to the bottom of the mine shaft, the upper adapter is installed at the top of the hollow heat exchange plate close to the entrance of the mine shaft, the fourth axial flow fan is installed on the air extraction interface of the upper adapter, and one end of the air extraction pipe is installed on the interface of the lower adapter.

[0017] The beneficial effects of the present application are:

[0018] The intake heat exchanger is installed at the return air shaft, the intake heat exchanger is used to make the return air discharged from the return air shaft to exchange heat with the external air sucked into the intake heat exchanger for the first time, the external air is preheated, and the residual heat in the return air is fully utilized;

[0019] The return air shaft heat exchanger is installed at the bottom of the return air shaft, the high-temperature return air at the bottom of the return air shaft is used to exchange heat with the external air preheated in the return air shaft heat exchanger for the second time, so that the temperature of the external air after heat exchange in the return air shaft heat exchanger approaches the temperature of the return air at the bottom of the return air shaft, then the heated external air is sent to the mine shaft close to the entrance of the mine shaft through the gas conveying hose and the mine air supply mechanism, the inner wall of the mine shaft close to the entrance of the mine shaft is heated and prevented from freezing, the external air is exchanged in the return air shaft and conveyed from the inside of the mine shaft, avoiding heat loss of the return air before heat exchange with the external air, and avoiding heat loss of the heated external air during ground conveying;

[0020] The mine shaft heat exchanger is installed on the inner wall of the mine shaft close to the entrance of the mine shaft, the return air at the bottom of the mine shaft is sucked into the mine shaft heat exchanger by the fourth axial flow fan to directly heat and prevent freezing of the inner wall of the mine shaft, the number of heat exchange times of the return air is reduced, and the heat exchange efficiency of the return air is improved;

[0021] In summary, the mine shaft anti-freezing system of the present application efficiently utilizes the heat in the return air to heat the external air, then heats and prevents freezing of the mine shaft, and saves coal mine combustion and electric energy consumption caused by electric heating. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0023] Figure 1 is a structural schematic view of the first perspective of the mine shaft anti-freezing system in the present application;

[0024] Figure 2 is the structural schematic diagram of the second perspective of the mine shaft anti-freezing system in the application;

[0025] Figure 3 is the structural schematic diagram of the air inlet heat exchanger after being cut open in the application;

[0026] Figure 4 is the structural schematic diagram of the return air shaft heat exchanger in the application;

[0027] Figure 5 is the structural schematic diagram of the movable support frame in the application;

[0028] Figure 6 is the structural schematic diagram of the mine air supply mechanism in the application;

[0029] Figure 7 is the structural schematic diagram of the mine shaft heat exchanger in the application;

[0030] Explanation of the reference numerals in the drawing: air inlet heat exchanger 1, outer shell 101, inner shell 102, first heat exchange pipe 103; return air shaft heat exchanger 2, air inlet connecting head 201, air outlet connecting head 202, second heat exchange pipe 203; mine air supply mechanism 3, air supply hard pipe 301, reducing tee 302, cover 303; mine shaft heat exchanger 4, hollow heat exchange plate 401, lower adapter 402, upper adapter 403; air inlet pipe 5, air conveying hose 6, air taking pipe 7, exhaust tower 8, air exhaust hose 9, movable support frame 10, upper support ring 1001, lower support ring 1002, support rod 1003, inclined rod 1004; first axial flow fan 11, second axial flow fan 12, third axial flow fan 13, fourth axial flow fan 14, dust filter screen cylinder 15. DETAILED DESCRIPTION

[0031] The application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0032] As shown in the drawings, Figures 1 to 7 An efficient and energy-saving mine shaft anti-freezing system includes an air inlet heat exchanger 1, a return air shaft heat exchanger 2, a mine air supply mechanism 3, and a mine shaft heat exchanger 4.

[0033] The air inlet heat exchanger 1 is installed at the return air shaft opening to perform one-time heat exchange of the air inlet and the return air. The air inlet heat exchanger 1 is provided with a first axial flow fan 11 for extracting the return air in the return air shaft and a second axial flow fan 12 for sucking external air into the air inlet heat exchanger.

[0034] The specific structure of the intake heat exchanger 1 is as follows: the intake heat exchanger 1 comprises a spindle-shaped outer shell 101 and a barrel-shaped inner shell 102, the bottom end of the outer shell 101 is mounted on the well mouth of the return air well, the inner diameter of the opening at the bottom end of the outer shell 101 is larger than the diameter of the well mouth of the return air well; the inner shell 102 is located at the center of the outer shell 101, a plurality of first heat exchange pipes 103 arranged in a ring array are welded between the outer shell 101 and the inner shell 102, the inside of the inner shell 102 is connected with the outside of the outer shell 101 through the first heat exchange pipes 103, a first axial flow fan 11 is mounted on the top of the outer shell 101, a second axial flow fan 12 is mounted on the bottom of the inner shell 102, and the top end of the inner shell 102 is closed.

[0035] The intake heat exchanger is installed on the well mouth of the return air well, and the intake heat exchanger is used to make the return air discharged from the return air well enter the first heat exchange with the external air sucked into the intake heat exchanger, so as to preheat the sucked external air and fully utilize the residual heat in the return air.

[0036] A discharge tower 8 for discharging the return air at a high altitude is mounted on the air outlet of the first axial flow fan 11, so as to avoid the discharged return air directly entering the intake heat exchanger as the external air, thereby preventing the external air entering the intake heat exchanger from being insufficient in oxygen content.

[0037] The return air well heat exchanger 2 is installed at the bottom of the return air well to perform the second heat exchange of the intake air and the return air, and the return air well heat exchanger 2 is connected with the air outlet of the second axial flow fan through the intake pipe 5. The return air well heat exchanger 2 comprises a barrel-shaped intake connecting head 201 and a barrel-shaped air outlet connecting head 202, a plurality of second heat exchange pipes 203 arranged in a ring array are welded between the intake connecting head 201 and the air outlet connecting head 202 in the same return air well heat exchanger 2; when two adjacent return air well heat exchangers 2 are assembled, the intake connecting head 201 of one return air well heat exchanger 2 is screwed with the air outlet connecting head 202 of the other return air well heat exchanger 2; when the return air well heat exchanger 2 is assembled with the intake pipe 5, the intake connecting head 201 of the return air well heat exchanger 2 is screwed with the tail of the intake pipe 5.

[0038] The mine air supply mechanism 3 is installed in the mine shaft, the air inlet of the mine air supply mechanism 3 is connected with the air outlet of the return air well heat exchanger 2 through the air conveying hose 6, and a plurality of third axial flow fans 13 for blowing air to prevent freezing in the mine shaft are arranged at the head of the mine air supply mechanism 3 close to the entrance of the mine shaft. The mine air supply mechanism 3 comprises a plurality of circular pipe-shaped air conveying hard pipes 301, a plurality of reducing tees 302, and a circular cover 303, the air conveying hard pipes 301 are screwed with adjacent air conveying hard pipes 301, the air conveying hard pipes 301 are screwed with adjacent reducing tees 302, the cover 303 is screwed at the end of the reducing tee 302 close to the entrance of the mine shaft, and the third axial flow fans 13 are installed on the interfaces on the side of the reducing tees 302.

[0039] The air supply hard pipe 301 is wrapped with thermal insulation cotton to prevent the temperature of the heated external air from decreasing during the transportation in the air supply hard pipe 301.

[0040] The air return shaft heat exchanger is installed at the bottom of the air return shaft, and the external air preheated in the air return shaft heat exchanger is subjected to secondary heat exchange with the high-temperature air return at the bottom of the air return shaft, so that the temperature of the external air after the heat exchange in the air return shaft heat exchanger approaches the temperature of the air return at the bottom of the air return shaft.

[0041] The mine shaft heat exchanger 4 is installed on the inner wall of the mine shaft near the mine shaft entrance, the air inlet of the mine shaft heat exchanger 4 is provided with an air intake pipe 7 extending to the bottom of the mine shaft to suck the air return, and the air outlet of the mine shaft heat exchanger 4 is provided with a fourth axial flow fan 14 for sucking the air return.

[0042] The mine shaft heat exchanger 4 comprises a plurality of hollow heat exchange plates 401 in the shape of circular arcs, a lower adapter 402 and an upper adapter 403, the hollow heat exchange plates 401 are installed on the inner wall of the mine shaft by expansion bolts, the convex surface of the hollow heat exchange plates 401 is attached to the inner wall of the mine shaft, adjacent two hollow heat exchange plates 401 are connected in a plug-in manner, the lower adapter 402 is installed at the bottom of the hollow heat exchange plates 401 near the bottom of the mine shaft, the upper adapter 403 is installed at the top of the hollow heat exchange plates 401 near the entrance of the mine shaft, the fourth axial flow fan 14 is installed on the air suction interface of the upper adapter 403, and one end of the air intake pipe 7 is installed on the interface of the lower adapter 402.

[0043] The mine shaft heat exchanger is installed on the inner wall of the mine shaft near the mine shaft entrance, and the air return at the bottom of the mine shaft is sucked into the mine shaft heat exchanger by the fourth axial flow fan to directly heat and prevent freezing of the inner wall of the mine shaft, thereby reducing the heat exchange times of the air return and improving the heat exchange efficiency of the air return.

[0044] The air outlet of the fourth axial flow fan 14 is connected to the exhaust tower 8 through the exhaust hose 9, and the air return passing through the mine shaft heat exchanger is sent to the exhaust tower 8 for high-altitude exhaust.

[0045] The bottom of the air intake pipe 7 is provided with a dust filter net cylinder 15 to prevent dust from entering.

[0046] The air inlet pipe 5 and the air return well heat exchanger 2 are respectively provided with a movable support frame 10, the movable support frame 10 comprising an upper support ring 1001, a lower support ring 1002, three support rods 1003 arranged in a ring array, and three inclined rods 1004 arranged in a ring array, the tail of the support rod 1003 being hinged to the outer side of the upper support ring 1001, the tail of the inclined rod 1004 being hinged to the outer side of the lower support ring 1002, the head of the inclined rod 1004 being hinged to the middle of the support rod 1003, and the head of the support rod 1003 being clamped on the inner wall of the air return well.

[0047] The movable support frame 10 is installed at the connection of two adjacent air inlet pipes 5, or the connection of two adjacent air return well heat exchangers 2, or the connection of an air inlet pipe 5 and an air return well heat exchanger 2. During installation, the lower support ring and the upper support ring are pressed towards each other by the two adjacent air inlet pipes 5, or the two adjacent air return well heat exchangers 2, or the air inlet pipe 5 and the air return well heat exchanger 2, and the inclined rods 1004 stretch the support rods 1003 away from the lower support ring, so that the three support rods 1003 are supported in the air return well.

[0048] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A high efficiency energy saving mine shaft freezing system, characterized in that, The application relates to a mine air supply mechanism. The application relates to a mine air supply mechanism. The application relates to a mine air supply mechanism. The application relates to a mine air supply mechanism. The application relates to a mine air supply mechanism.

2. The mine shaft frost protection system according to claim 1, wherein: The application relates to a mine air supply mechanism.

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The mine shaft frost prevention system of claim 1, wherein: The mine air supply mechanism comprises a plurality of round pipe-shaped air supply hard pipes, a plurality of reducing tees, and a round cover, the air supply hard pipes are screwed with adjacent air supply hard pipes, the air supply hard pipes are screwed with adjacent reducing tees, the cover is screwed at the end of the reducing tee close to the mine shaft inlet, and the third axial flow fan is installed on the interface on the side of the reducing tee.

5. The mine shaft frost prevention system of claim 4, wherein: The air supply hard pipe is wrapped with heat preservation cotton.

6. The mine shaft frost prevention and control system according to claim 1, wherein: The mine shaft heat exchanger comprises a plurality of circular-arc hollow heat exchange plates, a lower adapter, and an upper adapter, the hollow heat exchange plates are installed on the inner wall of the mine shaft by expansion bolts, the convex surface of the hollow heat exchange plates is attached to the inner wall of the mine shaft, two adjacent hollow heat exchange plates are connected in a plug-in mode, the lower adapter is installed at the bottom of the hollow heat exchange plate close to the bottom of the mine shaft, the upper adapter is installed at the top of the hollow heat exchange plate close to the inlet of the mine shaft, the fourth axial flow fan is installed on the air extraction interface of the upper adapter, and one end of the air extraction pipe is installed on the interface of the lower adapter.

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