Foam curtain device for preventing coal chute blockage

Abstract

The present application relates to a kind of anti-falling coal hopper jamming foaming curtain device, including coal hopper, foam curtain generating unit and foam mixture supply unit;Foam curtain generating unit is hollow structure, inside is foam mixture temporary storage cavity.Foam curtain generating unit is set on the side wall of coal hopper, can be injected to the inner wall of coal hopper on foam curtain, forms flowing foam curtain on the inner wall of coal hopper.Foam curtain is between the coal seam close to the inner wall of coal hopper and the inner wall of coal hopper, reduce the friction coefficient of coal and the inner wall of coal hopper, effectively reduce the viscosity coefficient of the coal seam close to the inner wall of coal hopper, so as to facilitate to alleviate jamming situation, improve the stability of equipment operation.At the same time, foam curtain reduces the possibility of dust formation of coal flow, reduces the pollution of raising coal, improves the environment around coal hopper.In addition, flowing foam curtain reduces the incidence of spontaneous combustion of high volatile coal, improves the reliability of coal conveying equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal chute supporting facilities, and particularly relates to a foam curtain spraying device for preventing coal chute blockage. BACKGROUND

[0002] Thermal power generation is divided into coal-fired power generation, oil-fired power generation and gas-fired power generation according to the fuel used. The fuel used in coal-fired power generation is coal.

[0003] Due to the cost of power generation, many coal-fired power plants in China will mix and use secondary smoke coal and other coal species in a certain proportion according to the characteristics of the power plant boiler. However, secondary smoke coal has the characteristics of strong viscosity and is easy to adhere to the inner wall of the coal chute, aggravating the blockage of the coal chute and affecting the safe production of the coal-fired system.

[0004] The coal chute is usually a hollow structure with an upper opening and a lower opening. The coal falls in the coal chute by gravity. Since the upper opening of the coal chute is large and the lower opening is small, the space for flowing downward becomes smaller, and the coal is easily pressed when falling, which can easily cause blockage. If the coal has a large viscosity coefficient and is easy to adhere to the inner wall of the coal chute, the blockage will be aggravated.

[0005] Therefore, how to reduce the viscosity coefficient of the coal layer close to the inner wall of the coal chute to alleviate the blockage has become a technical problem to be solved by those skilled in the art. SUMMARY

[0006] To solve the problem that the coal layer close to the inner wall of the coal chute has a large viscosity coefficient and is easy to adhere to the inner wall of the coal chute, aggravating the blockage, the present application provides a foam curtain spraying device for preventing coal chute blockage.

[0007] To achieve the purpose of the present application, a foam curtain spraying device for preventing coal chute blockage is provided, which comprises:

[0008] a coal chute;

[0009] a foam curtain generating unit, which is a hollow structure and has a foam mixture temporary storage cavity inside; the foam curtain generating unit is arranged on the side wall of the coal chute and can spray a foam curtain onto the inner wall of the coal chute;

[0010] a foam mixture supply unit, which is in communication with the foam curtain generating unit and can deliver foam mixture to the foam curtain generating unit.

[0011] In some embodiments, the foam curtain generating unit is four, which are arranged on the side walls of the four sides of the coal chute.

[0012] In some embodiments, each foam curtain generating unit comprises:

[0013] A spray pipe is arranged in the coal drop, the axis of the spray pipe is perpendicular to the axis of the coal drop, and the spray pipe is in communication with the foam mixture supply unit.

[0014] A plurality of nozzles are uniformly fixed to the bottom end of the spray pipe along the axial direction of the spray pipe.

[0015] In some embodiments, each foam curtain generating unit further comprises:

[0016] A cylinder is arranged with an inclined axis, the cylinder barrel is fixedly connected to the outer wall of the coal drop, and the piston rod penetrates into the coal drop;

[0017] A first sliding groove;

[0018] A first sliding block is slidably connected in the first sliding groove; the first sliding block is fixedly connected to the piston rod of the cylinder;

[0019] A second sliding groove is arranged in cross with the first sliding groove and in internal communication with the first sliding groove;

[0020] A second sliding block is slidably connected in the second sliding groove;

[0021] A transmission rod is rotatably connected at one end to the first sliding block and at the other end to the second sliding block;

[0022] A rocker is rotatably connected at one end to the middle part of the transmission rod and at the other end to one end of the spray pipe;

[0023] The piston rod can drive the first sliding block to slide along the first sliding groove, the first sliding block drives the second sliding block to slide along the second sliding groove through the transmission rod, and the spray pipe is driven to rotate around its axis through the rocker.

[0024] In some embodiments, each foam curtain generating unit further comprises:

[0025] A protective cover is arranged in the coal drop and above the spray pipe.

[0026] In some embodiments, the protective cover has an arc-shaped cross section and is hingedly connected to the inner wall of the coal drop on one side.

[0027] In some embodiments, the foam mixture supply unit comprises:

[0028] A storage tank has a hollow structure, the inner part of the lower part is a foam liquid storage cavity, the inner part of the upper part is a water storage cavity, an exhaust port is arranged at the top, and a sewage outlet is arranged at the bottom;

[0029] A flow guide pipe is arranged with a vertical axis and penetrates into the storage tank, the top end of the flow guide pipe extends to the outside of the storage tank through the exhaust port; the top end of the flow guide pipe is a foam liquid injection port, and the bottom end is a foam liquid outlet;

[0030] The proportional mixer is provided with a pressure water inlet at one end and a foam mixture outlet at the other end; the foam mixture outlet can be communicated with the foam curtain generating unit; the interior of the proportional mixer near the pressure water inlet is communicated with the interior of the upper part of the storage tank; and the interior of the proportional mixer near the foam mixture outlet is communicated with the upper part of the flow guide pipe.

[0031] In some embodiments, a partition is arranged in the middle of the proportional mixer; a plurality of throttling holes are arranged on the partition.

[0032] In some embodiments, the foam mixture supply unit further comprises:

[0033] An inlet valve is connected with the pressure water inlet at one end and communicated with the pressure water inlet;

[0034] An outlet valve is connected with the foam mixture outlet at one end and communicated with the foam mixture outlet;

[0035] A one-way valve is communicated with the other end of the outlet valve at one end and communicated with the middle part of the shunt pipeline at the other end;

[0036] A high-pressure mixing valve is communicated with one end of the shunt pipeline at one end;

[0037] A pressure reducing valve is communicated with the other end of the shunt pipeline at one end;

[0038] A low-pressure mixing valve is communicated with the other end of the pressure reducing valve at one end and communicated with the foam curtain generating unit at the other end.

[0039] In some embodiments, a pressure water valve is arranged on the communication pipeline of the proportional mixer and the storage tank; and a foam liquid valve is arranged on the communication pipeline of the proportional mixer and the flow guide pipe.

[0040] The foam curtain generating unit can spray the foam curtain on the inner wall of the coal drop chute, and the flowing foam curtain is formed on the inner wall of the coal drop chute. The foam curtain is between the coal layer close to the inner wall of the coal drop chute and the inner wall of the coal drop chute, which reduces the friction coefficient of the coal and the inner wall of the coal drop chute, effectively reduces the viscosity coefficient of the coal layer close to the inner wall of the coal drop chute, thereby facilitating the relief of the blockage and improving the stability of the equipment operation. At the same time, the foam curtain reduces the possibility of dust formation of the coal flow, reduces the pollution of the coal dust, and improves the environment around the coal drop chute. In addition, the flowing foam curtain reduces the occurrence rate of spontaneous combustion of high-volatile coal, and improves the reliability of the coal conveying equipment. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of some embodiments of the foam curtain spraying device for preventing the coal drop chute from being blocked;

[0042] Figure 2 isFigure 1 A schematic diagram of the combined structure of the coal hopper and the foam curtain generating unit in some specific embodiments of the foam curtain spraying device for preventing coal hopper blockage is shown.

[0043] Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle;

[0044] Figure 4 yes Figure 1 The diagram shows a structural schematic of some specific embodiments of the foam curtain generating unit in the foam curtain spraying device for preventing coal hopper blockage.

[0045] In the attached diagram, 110 is a coal hopper; 120 is a foam curtain generating unit; 121 is a nozzle; 122 is a spray pipe; 123 is a cylinder; 1241 is a first chute; 1242 is a second chute; 1251 is a first slider; 1252 is a second slider; 126 is a transmission rod; 127 is a rocker arm; 128 is a protective cover; 129 is a support frame; 130 is a foam mixture supply unit; 131 is a storage tank; 132 is a guide pipe; 133 is a proportioning mixer; 1331 is a partition plate; 134 is an inlet valve; 135 is an outlet valve; 136 is a check valve; 137 is a branch pipe; 138 is a high-pressure mixing valve; 1391 is a pressure reducing valve; 1392 is a low-pressure mixing valve; 1393 is a pressure water valve; 1394 is a foam liquid valve; and 140 is a branch pipe. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0048] In the description of this invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axis", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "connecting", "hinging" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] As described in the background, due to the cost of power generation, many coal-fired power plants in China will mix and use sub-bituminous coal and other coal species in a certain proportion according to the characteristics of the power plant boiler. However, sub-bituminous coal has a large viscosity coefficient and is easy to adhere to the inner wall of the coal drop, which will aggravate the degree of blockage.

[0052] In order to improve the above problems, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The application provides a device for preventing coal chute from being blocked by spraying foam curtain, which comprises a coal chute 110, a foam curtain generating unit 120 and a foam mixture supply unit 130. The coal chute 110 is a hollow structure with an upper opening and a lower opening, and the upper opening is larger than the lower opening. The coal in the coal chute 110 falls by gravity. The foam curtain generating unit 120 is a hollow structure with a foam mixture temporary storage cavity inside. The foam mixture can be temporarily stored in or flow through the foam mixture temporary storage cavity. The foam curtain generating unit 120 is arranged on the side wall of the coal chute 110 and can spray the foam curtain on the inner wall of the coal chute 110 to form a flowing foam curtain on the inner wall of the coal chute 110. The foam curtain is between the coal layer close to the inner wall of the coal chute 110 and the inner wall of the coal chute 110, which reduces the friction coefficient between the coal and the inner wall of the coal chute 110, effectively reduces the viscosity coefficient of the coal layer close to the inner wall of the coal chute 110, thereby facilitating the alleviation of the blocking condition and improving the stability of the equipment operation. At the same time, the foam curtain reduces the possibility of dust formation of the coal flow, reduces the coal dust pollution and improves the environment around the coal chute 110. In addition, the flowing foam curtain reduces the occurrence rate of spontaneous combustion of high-volatile coal and improves the reliability of the coal conveying equipment. The foam mixture supply unit 130 is in communication with the foam curtain generating unit 120 and can continuously supply the foam mixture to the foam curtain generating unit 120.

[0053] In some practical applications, the foam curtain generating unit 120 is two, which are arranged on the side walls of the opposite sides of the coal chute 110, respectively, and can spray the foam curtain on the inner wall of the corresponding side to form a flowing foam curtain on the inner wall of the corresponding side, thereby effectively reducing the viscosity coefficient of the coal layer close to the inner wall of the corresponding side of the coal chute 110 and facilitating the alleviation of the blocking condition.

[0054] In some other practical applications, the foam curtain generating unit 120 is four, which are arranged on the side walls of the four sides of the coal chute 110, respectively, and can spray the foam curtain on the inner wall of the corresponding side to form a flowing foam curtain on the inner wall of the corresponding side, thereby effectively reducing the viscosity coefficient of the coal layer close to the inner wall of the corresponding side of the coal chute 110 and facilitating the alleviation of the blocking condition.

[0055] Specifically, in the exemplary embodiment, each foam curtain generating unit 120 comprises a spray pipe 121, a nozzle 122, a cylinder 123, a first sliding groove 1241, a first sliding block 1251, a second sliding groove 1242, a second sliding block 1252, a transmission rod 126 and a rocker 127. The spray pipe 121 is arranged in the coal drop hopper 110. The axis of the spray pipe 121 is perpendicular to the axis of the coal drop hopper 110. The inside of the spray pipe 121 is in communication with the foam mixture supply unit 130. The foam mixture is supplied to the spray pipe 121 by the foam mixture supply unit 130. The nozzle 122 is a plurality of nozzles which are uniformly fixed to the bottom end of the spray pipe 121 along the axial direction of the spray pipe 121. The axis of the cylinder 123 is obliquely arranged. The cylinder barrel is fixedly connected to the outer wall of the coal drop hopper 110. The piston rod penetrates into the coal drop hopper 110. Since the air in the environment where the coal drop hopper 110 is located contains carbon ash, the cylinder 123 is used as the driving source, which is safer than using a driving motor. The cylinder 123 does not need to be additionally provided with an explosion-proof structure, thereby simplifying the structure of the driving source. The axis of the first sliding groove 1241 is arranged in line with the axis of the cylinder 123. The first sliding block 1251 is slidably connected in the first sliding groove 1241. The first sliding block 1251 is fixedly connected to the piston rod of the cylinder 123. The second sliding groove 1242 is arranged transversely to the first sliding groove 1241 and in communication with the inside of the first sliding groove 1241. The second sliding block 1252 is slidably connected in the second sliding groove 1242. One end of the transmission rod 126 is rotatably connected to the first sliding block 1251. The other end of the transmission rod 126 is rotatably connected to the second sliding block 1252. One end of the rocker 127 is rotatably connected to the middle part of the transmission rod 126. The other end of the rocker 127 is fixedly connected to one end of the spray pipe 121. The piston rod of the cylinder 123 can make linear reciprocating motion to drive the first sliding block 1251 to make linear reciprocating sliding along the first sliding groove 1241. The first sliding block 1251 drives the second sliding block 1252 to make linear reciprocating sliding along the second sliding groove 1242 through the transmission rod 126. The spray pipe 121 is driven to rotate about its axis by the rocker 127, thereby changing the orientation of the nozzle 122, so as to control the area of the foam curtain and improve the forming effect of the foam curtain, thereby reducing the adhesion coefficient of the coal layer close to the inner wall of the coal drop hopper 110.

[0056] Preferably, in the exemplary embodiment, each foam curtain generating unit 120 further comprises a protective cover 128 which is arranged in the coal drop hopper 110 and covers the spray pipe 121. The protective cover 128 can avoid the impact of falling coal on the spray pipe 121 and the nozzle 122, thereby prolonging the service life of the spray pipe 121 and the nozzle 122. The surface of the protective cover is plated with a wear-resistant layer. The protective cover is in a long strip structure and has an arc-shaped cross section. One side of the protective cover is hingedly connected to the inner wall of the coal drop hopper 110. When impacted by falling coal, the protective cover can swing, thereby having a good buffering effect. When not impacted by falling coal, the protective cover can be reset. The protective cover 128 can be turned over to facilitate maintenance and repair of the spray pipe 121 and the nozzle 122.

[0057] Preferably, in the exemplary embodiment, each foam curtain generating unit 120 further comprises two support frames 129. The two support frames 129 are respectively arranged at two ends of the same spray pipe 121 and are fixedly connected with the inner wall of the coal drop hopper 110. Each support frame 129 is provided with two supporting legs and a bearing. Each support frame 129 is connected with the end of the spray pipe 121 through the bearing. The support frame 129 can effectively support the spray pipe 121 and ensure the stability of the spatial position of the spray pipe 121.

[0058] Specifically, in the exemplary embodiment, the foam mixture supply unit 130 comprises a storage tank 131, a flow guide pipe 132, a proportional mixer 133, an inlet valve 134, an outlet valve 135, a one-way valve 136, a high-pressure mixing valve 138, a pressure reducing valve 1391, a low-pressure mixing valve 1392, a pressure water valve 1393, and a foam liquid valve 1394. The storage tank 131 is a hollow structure, the inside of the lower part of which is a foam liquid storage cavity, the inside of the upper part of which is a water storage cavity, the top of which is provided with an exhaust port, and the bottom of which is provided with a sewage outlet. The axis of the flow guide pipe 132 is vertically arranged and penetrates the storage tank 131, with the top end extending out of the storage tank 131 through the exhaust port. The top end of the flow guide pipe 132 is a foam liquid injection port, and the bottom end is a foam liquid outlet port. One end of the proportional mixer 133 is provided with a pressure water inlet, and the other end is provided with a foam mixture outlet. The foam mixture outlet can be in communication with the foam curtain generating unit 120. The inside of the end of the proportional mixer 133 close to the pressure water inlet is in communication with the inside of the upper part of the storage tank 131. The inside of the end of the proportional mixer 133 close to the foam mixture outlet is in communication with the upper part of the flow guide pipe 132. One end of the inlet valve 134 is connected with the pressure water inlet and in communication. One end of the outlet valve 135 is connected with the foam mixture outlet and in communication. One end of the one-way valve 136 is in communication with the other end of the outlet valve 135, and the other end is in communication with the middle part of the shunt pipeline 137. One end of the high-pressure mixing valve 138 is in communication with one end of the shunt pipeline 137. Opening the high-pressure mixing valve 138 can make the foam liquid be sprayed out in a high-pressure state, which can be used for fire extinguishing, further perfecting the coal burning fire extinguishing system, extinguishing the fire in the budding state, and improving the safety of the coal conveying equipment. One end of the pressure reducing valve 1391 is in communication with the other end of the shunt pipeline 137. One end of the low-pressure mixing valve 1392 is in communication with the other end of the pressure reducing valve 1391, and the other end is in communication with the spray pipe 121 of each foam curtain generating unit 120 through the shunt branch pipe 140, respectively. The pressure water valve 1393 is arranged on the communication pipeline between the proportional mixer 133 and the storage tank 131. The foam liquid valve 1394 is arranged on the communication pipeline between the proportional mixer 133 and the flow guide pipe 132.

[0059] The working principle of the foam mixture supply unit 130 is as follows:

[0060] The foam liquid storage chamber is used to store foam agent, and the water storage chamber is used to store water. The foam agent is composed of fluorocarbon surfactant, non-fluorine surfactant (carbon-chlorine surfactant or silicone surfactant), and additives for improving foam performance (foam stabilizer, antifreeze, cosolvent, thickening agent, etc.), and water. According to the volume mixing ratio with water, it is divided into 3% water film forming foam extinguishing agent and 6% water film forming foam extinguishing agent, and the specific gravity of the foam agent is greater than that of water. When the pressure water flows into the proportional mixer 133 through the inlet valve 134, part of the pressure water flows into the storage tank 131 through the pressure water valve 1393 to press the foam liquid in the tank out, and the pressed foam liquid flows into the proportional mixer 133 through the foam liquid valve 1394. Another part of the pressure water flows through the proportional mixer 133. In the proportional mixer 133, another part of the pressure water and the foam liquid are mixed according to the preset proportion to form a foam mixture. The foam mixture flows into the shunt branch pipe 140 after flowing through the outlet valve 135 and the one-way valve 136. The foam mixture in the shunt branch pipe 140 can flow out through the high-pressure mixing valve 138, or flow into the spray pipe 121 through the pressure reducing valve 1391 and the low-pressure mixing valve 1392. Because the overflow ring is arranged at the bottom end of the communication pipeline between the proportional mixer 133 and the storage tank 131, the pressure water flowing into the storage tank 131 can slowly flow out from the top of the tank, the water and the foam liquid cannot be quickly mixed, and the foam agent with a specific gravity greater than water is always below the water to meet the requirement of the proportional mixer 133 for mixing the foam liquid with water according to the proportion.

[0061] The use method of the foam mixture supply unit 130 is as follows:

[0062] The exhaust port at the top of the storage tank 131 is opened, the foam liquid is filled into the storage tank 131 through the foam liquid filling port of the flow guide pipe 132, which can be manually filled or filled with the help of an electric liquid filling pump. Because the specific gravity of the foam liquid is greater than that of clean water, when the foam liquid fills the bottom of the storage tank 131, the excess water is squeezed out from the exhaust port. After the foam liquid is filled, the exhaust port is closed. Then, the inlet valve 134 and the outlet valve 135 are opened, the pressure water is transported to the inlet valve 134, when the water pressure reaches the required pressure, the pressure water valve 1393 is opened, the pressure gauge at the exhaust port is observed, when the pressure in the tank reaches the required value, the foam liquid valve 1394 is opened. The proportional mixer 133 outputs the foam mixture with a preset proportion. Because the foam mixture supply unit 130 has mixed the foam liquid with water in the storage tank 131 when in use, the remaining foam liquid in the storage tank 131 after work cannot be used continuously. After each use, the remaining foam liquid should be completely discharged from the sewage outlet. It should be noted that the amount of foam liquid filled each time is generally 1 / 5-1 / 3 of the volume of the storage tank 131, and is not less than 500 liters.

[0063] Preferably, in the exemplary embodiment, a partition 1331 is arranged in the middle of the proportional mixer 133, and a plurality of throttling holes are arranged on the partition 1331. Since the partition 1331 is arranged in the middle of the proportional mixer 133, and the plurality of throttling holes are arranged on the partition 1331, the pressure water can only flow to the other side of the partition 1331, and the partition 1331 blocks the pressure water, so that a part of the pressure water flows through the pressure water valve 1393 into the storage tank 131. The throttling holes increase the flow rate of the pressure water in the proportional mixer 133.

[0064] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", "one specific embodiment" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the scope disclosed by the present application, and such replacements or changes should be covered within the protection scope of the present application.

Claims

1. A device for preventing the plugging of a coal chute by spraying a curtain of foam, characterised in that, The utility model relates to a coal bunker, and more particularly to a coal bunker with foam curtain. The coal bunker comprises: a coal bunker; a foam curtain generating unit, which is a hollow structure and has a foam mixture temporary storage cavity inside; the foam curtain generating unit is arranged on the side wall of the coal bunker and can spray a foam curtain on the inner wall of the coal bunker; a foam mixture supply unit, which is in communication with the foam curtain generating unit and can deliver foam mixture to the foam curtain generating unit; the foam mixture supply unit comprises: a storage tank, which is a hollow structure and has a foam liquid storage cavity in the lower part and a water storage cavity in the upper part, and is provided with an exhaust port at the top and a sewage outlet at the bottom; a flow guide pipe, which is arranged in the storage tank in a vertical axis and extends out of the storage tank through the exhaust port at the top end; the top end of the flow guide pipe is a foam liquid injection port, and the bottom end is a foam liquid outlet; 2. A falling coal chute anti-plugging froth curtain device according to claim 1, characterised in that, a proportional mixer, which is provided with a pressurized water inlet at one end and a foam mixture outlet at the other end; the foam mixture outlet can be in communication with the foam curtain generating unit; the inside of the proportional mixer near the pressurized water inlet is in communication with the inside of the upper part of the storage tank; the inside of the proportional mixer near the foam mixture outlet is in communication with the upper part of the flow guide pipe.

3. A curtain of foam to prevent coal chute blockage according to claim 1 or 2, characterised in that, The foam curtain generating unit comprises four foam curtain generating units, which are arranged on the side walls of the four sides of the coal bunker. Each foam curtain generating unit comprises: a spray pipe, which is arranged in the coal bunker and has an axis perpendicular to the axis of the coal bunker, and is in communication with the foam mixture supply unit inside; 4. A curtain of foam to prevent coal chute blockage according to claim 3, characterised in that, a plurality of nozzles, which are uniformly fixed to the bottom end of the spray pipe along the axial direction of the spray pipe. Each foam curtain generating unit further comprises: a pneumatic cylinder, which has an inclined axis, and the cylinder barrel is fixedly connected to the outer wall of the coal bunker, and the piston rod penetrates into the coal bunker; a first sliding groove; a first sliding block, which is slidably connected in the first sliding groove; the first sliding block is fixedly connected to the piston rod of the pneumatic cylinder; a second sliding groove, which is arranged in cross with the first sliding groove and is in communication with each other inside; a second sliding block, which is slidably connected in the second sliding groove; a transmission rod, which is rotatably connected to the first sliding block at one end and to the second sliding block at the other end; a rocker, which is rotatably connected to the middle part of the transmission rod at one end and to one end of the spray pipe at the other end; 5. A falling coal chute anti-plugging froth curtain device according to claim 3, characterized in that, the piston rod can drive the first sliding block to slide along the first sliding groove, the first sliding block drives the second sliding block to slide along the second sliding groove through the transmission rod, and the spray pipe is driven to rotate around its axis through the rocker. Each foam curtain generating unit further comprises:

6. A curtain of foam to prevent coal chute blockage according to claim 5 wherein, a protective cover, which is arranged in the coal bunker and covers the spray pipe above.

7. A curtain of foam to prevent coal chute blockage according to claim 6 wherein, The protective cover has an arc-shaped cross section and is hinged to the inner wall of the coal bunker on one side.

8. A curtain of foam to prevent coal chute blockage according to claim 7, characterised in that, A partition is arranged in the middle of the proportional mixer; a plurality of throttle holes are formed in the partition. The foam mixture supply unit further comprises: an inlet valve, which is connected to the pressurized water inlet at one end and in communication; an outlet valve, which is connected to the foam mixture outlet at one end and in communication; a one-way valve, which is in communication with the other end of the outlet valve at one end and with the middle part of the shunt pipeline at the other end; a high-pressure mixing valve, which is in communication with one end of the shunt pipeline at one end; A pressure reducing valve, one end of which is communicated with the other end of the shunt pipeline; A low-pressure mixing valve, one end of which is communicated with the other end of the pressure reducing valve, and the other end of which is communicated with the foam curtain generating unit.

9. A curtain of foam to prevent coal chute blockage according to claim 8, characterised in that, A pressure water valve is arranged on the communicating pipeline between the proportional mixer and the storage tank; and a foam liquid valve is arranged on the communicating pipeline between the proportional mixer and the flow guide pipe.

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