CN105344040A - Foam gel preparation device for preventing and controlling self-combustion of coal - Google Patents

Abstract

The invention discloses a foam gel preparation device for preventing spontaneous combustion of coal, which comprises a pulping pool, a mud pump, a foaming agent storage tank, an adding pump, a foaming gluer, and an air supply device; the pipeline of the pulping pool passes through three Connect with the foaming agent storage tank and the foaming gelator respectively, and respectively install mud pumps and adding pumps on the pipelines of the pulping tank and the foaming agent storage tank; the air supply device is connected with the foaming gelator; it also includes Liquid gelling agent storage tank, liquid gelling agent adding pump and foam gel outlet; liquid gelling agent storage tank pipeline is connected with foaming gelator, liquid gelling agent adding agent is installed on liquid gelling agent storage tank pipeline The outlet end of the pump and the foaming gel device is connected to the foam gel discharge port. The invention fundamentally avoids the problem of a large amount of water being precipitated when the foam bursts; and the foaming agent can be added immediately without intermediate pauses to wait for the foam to form, and continuous operation can be realized.

Description

A foam gel preparation device for preventing coal spontaneous combustion

technical field

The invention relates to a preparation method and device for mine foam, in particular to a foam gel preparation device for preventing coal spontaneous combustion.

Background technique

Mine fire is one of the major mine disasters in my country. In my country's key state-owned coal mines, fires caused by coal spontaneous combustion account for about 90% of the total number of mine fires, which seriously hinders the smooth progress of safe production. In order to effectively prevent coal spontaneous combustion, fire prevention technologies such as nitrogen, inhibitors, yellow mud grouting, gel and three-phase foam are widely used at present. Among them, gel has the advantages of good covering performance and strong heat absorption and cooling ability, but its disadvantages are small diffusion range and poor fluidity; three-phase foam has the advantages of wide diffusion range and fast fire extinguishing speed, but its foam stability is poor and the foam is very fast. When the foam bursts, a large amount of water flows back out of the fire area, which cannot keep the floating coal wet for a long time, and cooling inhibits the spontaneous combustion of the coal.

Patent name Multiphase gel foam preparation method for preventing coal spontaneous combustion, Chinese patent with publication number CN101265811A, the multiphase gel foam preparation method announced by this patent is to add crosslinking agent and thickener when traditional foam preparation, the purpose is Increasing the viscosity of the foam on the basis of the original foam fire extinguishing technology solves the problem of poor foam stability, but it has two shortcomings: first, a large amount of water will still flow out after the foam bursts. Second, the method for preparing gel foam in this patent is to put mud, cross-linking agent and thickener in a container, introduce nitrogen gas during the stirring process of the agitator, and then use a screw pump to transport the foam to In the fire area, the method is complicated to operate and the preparation amount is small. Since the mud, crosslinking agent and thickener are mixed in the mixer to form foam, continuous pumping of foam cannot be realized, and it is difficult to meet the needs of coal mine goafs and coal fields. Prevention and control of large area fires.

Contents of the invention

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a foam gel preparation device for preventing spontaneous combustion of coal, which integrates the advantages of gel and foam in preventing and extinguishing fire, greatly increases the covering performance of foam in preventing and extinguishing fire, and avoids the foam The disadvantage of a large amount of water precipitation after rupture, the generated gel uses foam as a carrier to cover a wide range of high, medium and low fire sources in goafs or coalfield fire areas, keep the coal wet and cool for a long time, and the operation is simple. Continuous pumping of foam is possible.

In order to achieve the above object, the present invention provides a foam gel preparation device for preventing coal spontaneous combustion, comprising a pulping tank, a mud pump, a foaming agent storage tank, an adding pump, a foaming gelator, and an air supply device; the pulping tank pipe The road is connected to the foaming agent storage tank and the foaming gelator through a tee, and the mud pump and the adding pump are respectively installed on the slurry tank pipeline and the foaming agent storage tank pipeline; the air supply device is connected to the foaming gelator ; It also includes a liquid gelling agent storage tank, a liquid gelling agent adding pump and a foam gel outlet; The coagulant is added to the pump, and the outlet end of the foaming gel device is connected to the foam gel discharge port.

The foam gel fire prevention and extinguishing method for coal spontaneous combustion control and its preparation system of the present invention combine the advantages of gel and foam fire prevention into one, the present invention and the multiphase gel for preventing and control of coal spontaneous combustion disclosed in the prior art publication number CN101265811A The advantages compared to foam preparation methods are:

First, let a large amount of liquid on the foam wall form a gel before the foam bursts. After the foam bursts, a gel solid will be formed. The gel can use the foam as a carrier, and the diffusion range in the fire prevention area becomes wider, and it can protect the goaf Or the high, medium and low fire sources of the coalfield fire area are covered in all directions. After a large amount of water on the foam wall turns into a gel, the stability of the foam is greatly increased. After the foam bursts, no water will flow out, and a large amount of Water will be consolidated in the gel body, forming a gel layer on the surface of the coal body, which can maintain long-term cooling coverage and heat absorption resistance to the coal body, and fundamentally avoid the problem of a large amount of water precipitation when the foam bursts.

Second, the patent prepares the foam gel by adding a gelling agent after the foam is formed, wherein the foaming agent can be added immediately without waiting for the foam to form in the middle, and continuous operation can be realized.

In addition, the foaming process of the foaming gelator does not require external power, which reduces the risk of the process and improves the safety and stability of the system; the addition of the gelling agent relies on the action of the spiral blade, which can be continuously and evenly The gelling agent is sent to the buffer tank, and the feeding amount can be adjusted through the stepless transmission on the screw feeder to achieve different construction requirements, and the powder gelling agent adder is easy to move and easy to operate. In the present invention, the outlet of the foam gel is transported to the goaf, and the foam gel produced has good fluidity and a wide diffusion range, can evenly fill the cracks in the goaf, effectively and permanently cover the coal body and resist heat absorption. The parts of the invention can be separately and flexibly installed, flexible and convenient, easy to operate and suitable for different places.

Description of drawings

Fig. 1 is the first embodiment schematic diagram of foam gel preparation device;

Fig. 2 is the second embodiment schematic diagram of foam gel preparation device;

Fig. 3 is the front view of adding pump and liquid gelling agent adding pump;

Fig. 4 is a top view of the addition pump and the liquid gelling agent addition pump.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

A kind of foam gel preparation method for preventing and controlling coal spontaneous combustion of the present invention, comprises the following steps:

(1) Prepare yellow mud on the ground or underground;

(2) Mix the well-proportioned foaming agent with the yellow mud to form a two-phase mixture;

(3) Fill the above-mentioned two-phase mixture with air or nitrogen, stir evenly to form foam;

(4) Add a gelling agent to the foam and mix evenly to form a foam gel.

As shown in Figure 1, a first embodiment of a foam gel preparation device for preventing coal spontaneous combustion according to the present invention includes a pulping tank 1, a mud pump 2, a foaming agent storage tank 3, an adding pump 4, and a foaming gelator 7 , air supply device 9; the pulping tank 1 pipeline is connected with the foaming agent storage tank 3 and the foaming gelator 7 respectively through a tee, and mud is respectively installed on the pulping tank 1 pipeline and the foaming agent storage tank 3 pipelines Pump 2, add pump 4; Air supply device 9 links to each other with foaming gel forming device 7; Also comprises liquid gelling agent storage tank 24, liquid gelling agent adding pump 25 and foam gel discharge port 11; Liquid gelling agent storage tank The tank 24 pipeline is connected with the foaming and gelling device 7, and the liquid gelling agent adding pump 25 is installed on the liquid gelling agent storage tank 24 pipelines, and the outlet of the foaming and gelling device 7 is connected to the foam gel discharge port 11.

As shown in Figure 2, the second embodiment of a foam gel preparation device for preventing coal spontaneous combustion according to the present invention differs from the first embodiment only in that the foaming agent storage tank 3 is arranged underground.

The first embodiment and the second embodiment are suitable for preparing foam gels from liquid gelling agents.

As a further improvement of the present invention, a stepless speed regulator is installed in the liquid gelling agent adding pump 25 .

As shown in Fig. 3 and Fig. 4, the liquid gelling agent addition pump 25 of embodiment 1 and 2 mainly consists of adjusting handle 26, speed regulating screw rod 27, rotating speed scale scale 28, flow scale scale 29, pointer 30, gearbox 32 , a plunger pump 33, and an explosion-proof motor 34; the explosion-proof motor 34 is connected to the plunger pump 33 through a gearbox 32, the adjustment handle 26 is connected to the gearbox 32 through a speed regulating screw 27, and a speed scale 28 is installed in the gearbox 32. Flow scale scale 29 and pointer 30. When in use, manually rotate the speed regulating handle 26 to drive the position of the speed regulating screw 27 to move, thereby changing the output speed of the gearbox 32, controlling the flow of the plunger pump 33, and finally realizing the control of the flow of the liquid gelling agent.

Further, the gas supply device 9 in Embodiments 1 to 2 is a nitrogen generator or an air compressor.

Further, a one-way valve 8 is provided on the nozzle connecting the foaming and gelling device 7 to the air supply device 9 in Embodiments 1 and 2, and on the nozzle connecting the foaming and gelling device 7 to the buffer tank 12 in Embodiments 1 and 2 A one-way valve 8 is provided. In Embodiments 3 and 4, a one-way valve 8 is provided on the nozzle connecting the foaming and gelling device 7 to the liquid gelling agent adding pump 25 . The installed check valve 8 can prevent the mixed liquid in the foaming and gel forming device 7 from flowing backwards.

Working process: the yellow mud is prepared on the ground or underground through the slurry tank 1, and is pressed into the pipeline under the action of the mud pump 2. The foaming agent that has been prepared is pressed into the pipeline by the adding pump 4, and the two pipelines pass through the tee Connected to form a two-phase mixed liquid, and then enter the foaming gluer 7; the other pipeline is connected to the gas supply device 9 downhole, and the gas is pressed into the foaming gluer 7 through the shut-off valve 5 through high pressure, and finally a uniform Foam, where the intake volume is controlled by the shut-off valve 5.

Working parameters: yellow mud supply 5-25m3/h, nitrogen or compressed air intake 100-900m3/h, screw feeding speed 500-1500r/min.

When using the first and second embodiment devices, the gelling agent in the liquid gelling agent storage tank 24 is pressed into the foaming gel forming device 7 by the gelling agent adding pump 25, wherein the addition amount of the liquid gelling agent can be passed through the gelling agent. The stepless variable speed regulator on the coagulant adding pump 25 is adjusted, and the coagulant and foam form uniform foam gel inside the foaming and gelling device 7, and are transported to the fire prevention area by pipelines.

Working parameters: yellow mud supply 5-25m3/h, nitrogen or compressed air intake 100-900m3/h, liquid gelling agent supply 0.5-2.5m3/h.

Claims (4)

1., for the frothy gel preparation facilities that spontaneous combustionof coal is administered, comprise slurrying pond (1), slush pump (2), blowing agent storage tank (3), add pump (4), foaming plastic device (7), feeder (9); Slurrying pond (1) pipeline is connected with blowing agent storage tank (3) and the plastic device (7) that foams respectively by threeway, slurrying pond (1) pipeline, blowing agent storage tank (3) pipeline is installed respectively slush pump (2), adds pump (4); Feeder (9) is connected with foaming plastic device (7); It is characterized in that, also comprise liquid gelling agent storage tank (24), liquid gelling agent adds pump (25) and frothy gel outlet (11); Liquid gelling agent storage tank (24) pipeline is connected with foaming plastic device (7), liquid gelling agent storage tank (24) pipeline is installed liquid gelling agent and adds pump (25), and foaming plastic device (7) port of export connects frothy gel outlet (11).

2. a kind of frothy gel preparation facilities administered for spontaneous combustionof coal according to claim 1, it is characterized in that, described interpolation pump (4) and liquid gelling agent add pump (25) primarily of regulating handle (26), speed governing screw mandrel (27), rotating speed graduated scale (28), flow scale scale (29), pointer (30), gearbox (32), plunger displacement pump (33), fire-proof motor (34) is formed; Fire-proof motor (34) connects plunger displacement pump (33) by gearbox (32), regulating handle (26) connects gearbox (32) by speed governing screw mandrel (27), rotating speed graduated scale (28) is installed, flow scale scale (29) and pointer (30) in gearbox (32).

3. a kind of frothy gel preparation facilities administered for spontaneous combustionof coal according to Claims 2 or 3, it is characterized in that, described blowing agent storage tank (3) is arranged in ground or down-hole.

4. a kind of frothy gel preparation facilities administered for spontaneous combustionof coal according to Claims 2 or 3, is characterized in that, described liquid gelling agent adds in pump (25) installs infinitely variable speeds adjuster.