CN214512939U - Coal system methyl alcohol gasification fine slag degree of depth dewatering device - Google Patents

Abstract

The utility model discloses a coal-to-methanol gasification fine slag deep dehydration device, which comprises a host system, a heating system and a vacuum system; the main machine system carries out dehydration work on the fine slag and is provided with a filter cloth shaking mechanism; the heating system flushes circulating hot water into an inner cavity of a diaphragm plate and an inner cavity of a heating plate in the host system so as to heat the filter cake; the vacuum system performs air pumping work on a filter cake cavity in the host system to form negative pressure in the host system and reduce the boiling point of water; the filter cloth shaking mechanism is matched with the discharging system to perform discharging operation. The utility model provides a coal system methyl alcohol gasification fine slag degree of depth dewatering device, full automatic control carries out work, can realize the filter cake moisture content greatly reduced after the dehydration that an equipment accomplishes the overall process of filtering, squeezing and mummification, reduces the transportation volume, and economy is the environmental protection again.

Description

Coal system methyl alcohol gasification fine slag degree of depth dewatering device

Technical Field

The utility model relates to a coal system methyl alcohol gasification fine slag degree of depth dewatering device.

Background

The water content in the gasified fine slag is mainly divided into four types: 1. interstitial water, namely free water, is easy to remove by using external mechanical pressure; 2. capillary bound water, which is water bound by capillaries between particles, requires high mechanical force and energy to remove; 3. surface adsorbed water, which is water that covers the entire surface of the particles and is adsorbed by surface tension, and this water can be removed by blowing; 4. internally bound water, which is the most difficult to remove, requires a high amount of energy to evaporate the water.

According to the characteristics of water content of gasified fine slag, the current drying and dehydrating equipment mainly comprises two types: 1. vacuum belt or centrifugal filters; 2. a plate and frame filter press.

The vacuum belt type or centrifugal filter has the advantages that: the one-time investment is small, and the cost is low. But the disadvantages are that: the slurry leakage and the liquid leakage are serious and the environmental pollution is serious in the transportation process; the transportation cost is high; the medicament consumption is large; the water consumption of the system is serious; the service life of the filter cloth is short, the filter cloth is frequently replaced, and the operation and maintenance cost is high; the equipment is of an open structure, the steam of a filter factory building is large, the wall surface of the filter factory building is seriously fallen after long-term operation, the ammonia smell in the factory building is heavier, and the equipment has great harm to the health of operators; the filter cake has high water content, which is not beneficial to reduction and boiler co-combustion.

The plate and frame filter press has the advantages that: simple structure, easy manufacture, compact equipment and strong adaptability to materials. The disadvantages of plate and frame filters are: the filter cake and the filter cloth are easy to bond; the working pressure is high, and the plate frame made of common materials is not pressure-resistant and is easy to break; the consumption of filter cloth is large; the unattended operation is difficult to achieve on site, the filter cloth needs to be cleaned manually, the workload is large, and potential safety hazards exist; the filter cake has high water content, which is not beneficial to reduction and boiler co-combustion. And the filter cloth of the plate-and-frame filter press can be adhered with the particles of the filter cake, and no suitable mechanism is provided at present, so that the particles can be removed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses not enough to prior art provides a coal system methyl alcohol gasification fine slag degree of depth dewatering device, and full automatic control carries out work, can realize the filter cake moisture content greatly reduced after the dehydration that an equipment accomplishes the overall process of filtering, squeezing and mummification, reduces the transportation volume, and economy is the environmental protection again.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve: a coal-to-methanol gasification fine slag deep dehydration device comprises a host system, a heating system and a vacuum system; the main machine system carries out dehydration work on the fine slag and is provided with a filter cloth shaking mechanism; the heating system flushes circulating hot water into an inner cavity of a diaphragm plate and an inner cavity of a heating plate in the host system so as to heat a filter cake; the vacuum system performs air pumping work on a filter cake cavity in the host system, so that negative pressure is formed in the vacuum system, and the boiling point of water is reduced; the filter cloth shaking mechanism is matched with the unloading system to unload materials.

Preferably, the filter cloth shaking mechanism comprises a spiral beam and a plurality of connecting parts arranged on the spiral beam, the connecting parts are arranged on the filter cloth, the spiral beam comprises a plurality of bent parts and straight parts, and the bent parts and the straight parts are arranged in a staggered manner; support bearing seats are arranged at two end parts of the spiral beam to provide a rolling support effect; the supporting bearing seat is arranged on the lifting base; one end of the spiral beam is provided with a gear, a motor is arranged on the lifting base at the position, and an output shaft of the motor is provided with a driving gear and is connected with the gear in a meshing manner to drive the gear to rotate.

Preferably, a quick-connection plug is arranged at the other end of the spiral beam, the spiral beam is arranged in a hollow manner, and the other end of the spiral beam is blocked to avoid air leakage; the straight part of the spiral beam is provided with an exhaust hole facing the bent part of the corresponding side, and the quick-connection plug is used for connecting an exhaust pipe of the high-pressure air pump.

Preferably, the bent part is provided with a ring groove, the connecting part is provided with a waist-shaped ring groove, and the bent part is clamped into the waist-shaped ring groove and is prevented from being separated by the ring groove; the width of the waist-shaped ring groove is larger than the inner diameter of the ring groove and smaller than the outer diameter of the bent part.

Preferably, the host system is provided with a fixed base, the fixed base is provided with a plurality of corrugated pipes, the top of each corrugated pipe props against the corresponding lifting base, and the corrugated pipes are connected with a high-pressure air pump.

Preferably, a connection column is arranged at the connection part arranged at the middle section of the filter cloth, and the connection column is used for installing the connection part on the filter cloth and has a length greater than the height of the bent part.

The utility model provides a coal-based methanol gasification fine slag deep dehydration device, which reduces the filter cake, greatly reduces the landfill capacity of a slag yard, recovers filtrate, saves water for the whole system, saves electricity and realizes social benefit; the filter cake is environment-friendly and loaded, no slurry leakage and liquid leakage exist, the field environment is good, and the environment-friendly benefit is realized; the water content is reduced to 25 percent, and the coal is conveyed to a boiler for blending combustion, so that the raw coal is saved, the transportation cost is reduced, and the economic benefit is realized; full automatic control, one key opens and stops, realizes the security benefit.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be discussed below, it is obvious that the technical solutions described in conjunction with the drawings are only some embodiments of the present invention, and for those skilled in the art, other embodiments and drawings can be obtained according to the embodiments shown in the drawings without creative efforts.

Fig. 1 is a process flow diagram of the present invention.

FIG. 2 is the water content change curve of the whole course of the dehydration drying of the utility model.

Fig. 3 is a process diagram of the present invention.

Fig. 4 is a schematic structural diagram of the filter cloth shaking mechanism of the present invention.

FIG. 5 is a schematic view of the structure of the connection portion at the end of the present invention

Fig. 6 is a schematic view of the local structure of the spiral beam of the present invention.

Fig. 7 is a schematic view of the structure of the connection portion located in the middle section of the present invention.

In the figure: spiral beam 1, curved portion 11, annular groove 111, straight portion 12, gear 13, quick connector 14, connecting portion 2, waist type spout 21, spliced pole 22, lifting base 3, support bearing frame 31, bellows 32, unable adjustment base 33, motor 4.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments described in the present disclosure, all other embodiments obtained by a person skilled in the art without creative efforts are within the scope of the present disclosure.

The gasification filter cake has over high water content of about 40 percent, is difficult to transport, wastes water resources, absorbs heat to burst when entering a boiler hearth for combustion, and leads to unstable combustion and causes boiler flameout in serious cases. And the gasified filter cake enters a boiler to be co-burned, and is generally conveyed by a pipeline, so that the problems of scaling and blockage exist in the pipeline conveying. Therefore, when the gasified filter cake enters the boiler for blending combustion, the water content of the gasified filter cake needs to be controlled to be about 25 percent.

The device provides a coal-to-methanol gasification fine slag deep dehydration device, and can solve the existing problems. The device is operated intermittently, has a treatment period, and utilizes the vacuum drying principle to reduce the water content of a filter cake to below 25 percent through the processes of feeding filtration, diaphragm squeezing and vacuum drying. The filter cake can not generate the conveying problems of adhesion, blockage, corrosion and the like. Finally, the mixture is sent to a circulating fluidized bed boiler for blending combustion. And returning the filtered filtrate to the gasification system. Therefore, the reduction in the transportation volume and the slag yard volume is realized, the value is increased by recycling the filtrate, and the energy conservation and the efficiency improvement of equipment are realized.

As shown in fig. 1 to 7, a coal-to-methanol gasification fine slag deep dehydration device comprises a host system, a heating system and a vacuum system; the main machine system carries out dehydration work on the fine slag and is provided with a filter cloth shaking mechanism; the heating system flushes circulating hot water into an inner cavity of a diaphragm plate and an inner cavity of a heating plate in the host system so as to heat a filter cake; the vacuum system performs air pumping work on a filter cake cavity in the host system, so that negative pressure is formed in the vacuum system, and the boiling point of water is reduced; the filter cloth shaking mechanism is matched with the unloading system to unload materials.

The working principle of the device is as follows: the fine sediment that the depositing tank subsided is scraped the bottom by depositing tank harrow glassware and is sent to plate and frame filter press by the feed pump, at first the squeeze pump send and squeeze water to plate and frame filter press diaphragm side and squeeze (pump outlet pressure 0.85MPa), then let in hot water in hot plate and diaphragm plate, heat the filter cake in the cavity, open the vacuum pump simultaneously, carry out the evacuation to the cavity, make its inside negative pressure that forms, reduce the boiling point of water, the moisture in the filter cake boils the vaporization thereupon, reach the mesh of degree of depth dehydration.

The water content of the filter cake after dehydration can be reduced to about 15-25%, and the whole process of filtering one batch of filter cake is detected on site on the same day by investigation, which is shown in figure 1. The water content of the filter cake was measured to be 23.79%, see FIG. 2. By prolonging the operation time of the vacuum system, the moisture content of the dehydrated filter cake can be stably reduced to below 25 percent.

The technology integrates filtering, filter pressing and vacuum drying, adopts a low-grade heat source, completes the whole processes of filtering, pressing and drying on one device, saves the transportation among a plurality of devices, reduces the transportation amount, and is economic and environment-friendly. Through the reduction of filter cakes, the landfill storage capacity of a slag site is greatly reduced, the water used by the whole system is saved by recovering the filtrate, the electricity is saved, and the social benefit is realized; the filter cake is environment-friendly and loaded, no slurry leakage and liquid leakage exist, the field environment is good, and the environment-friendly benefit is realized; the water content is reduced to 25 percent, and the coal is conveyed to a boiler for blending combustion, so that the raw coal is saved, the transportation cost is reduced, and the economic benefit is realized; full automatic control, one key opens and stops, realizes the security benefit.

The working process of the device is divided into three stages.

The first stage is as follows: dewatering is carried out by positive pressure of a feeding pump, and the feeding pressure can be selected from 0.6-1.0 MPa.

And a second stage: the water content is further reduced by diaphragm pressing, and the pressing pressure can be selected from 0.8-1.2 MP.

And a third stage: filling circulating hot water with the temperature of more than 85 ℃ into the inner cavity of the diaphragm plate and the inner cavity of the heating plate, and heating the filter cake, wherein the optimal temperature of the hot water is 95-99 ℃; simultaneously, starting a vacuum pump to vacuumize the filter cake cavity to form negative pressure in the filter cake cavity, reducing the boiling point of water, boiling and vaporizing the water in the filter cake, and allowing the steam-water mixture pumped out by the vacuum pump to pass through a condenser; after steam-water separation, liquid water is discharged periodically, tail gas is purified and then discharged, and the moisture of the final filter cake is controlled to be below 25%.

The host system adopts an equal-strength solid rectangular main beam connected with a thrust plate, a compression plate assembly and a rear support to form a rectangular frame. The frame welding uses the automatic submerged arc welding process, no matter parts such as the main beam or the thrust plate, the hold-down plate assembly and the like, the parts need to be subjected to high-speed centrifugal shot blasting treatment to eliminate surface iron scales and rust marks, then the parts are subjected to spray coating treatment by using epoxy micaceous iron primer, the surfaces are sprayed with acrylic polyurethane paint, and after the parts are subjected to shot blasting treatment, the adhesive force of the paint on the surfaces is greatly improved, and the parts have the strongest corrosion resistance.

The core component filter plate used by the host system meets the process requirements of dehydration and desiccation, and the quality is completely ensured. In the space where the volume of the filter cake decreases during the heating evaporation, the diaphragm expansion will continuously compensate for the decreased space. The process is very important, the filter plate is always in close contact with the dried filter cake, the heat conduction is always kept high, and the drying time is shortened. The PP outer frame design of the heating filter plate effectively reduces heat loss and saves energy cost.

The filter plates and the filter cloth selected according to the characteristics of the coal slime are arranged on the main beam, and a plurality of filter chambers are formed under the action of the pressure of the hydraulic cylinder, and meet the dehydration and drying requirements of specific coal slime.

The hydraulic system is designed and manufactured in an integrated mode with high performance and high precision. When the filter plate is pressed, the movable pressing plate pushes the filter plate to be close, the oil cylinders move synchronously, stable closing of the filter plate is achieved, pressure is applied evenly, sealing is reliable, and performance is good. The material of the hydraulic oil cylinder is not lower than 45 forged steel in GB699, the material is subjected to normalizing treatment, the perpendicularity tolerance of the axial lead of the end face of the piston rod, which is in contact with the piston, is not lower than 7 grades in GB1184, and the thread of the piston rod adopts 6 grades in GB197 precision.

The rated working pressure of the oil cylinder is 25MPa, and the maximum hydraulic protection pressure is 29 MPa. The time of the compression and return stroke of the oil cylinder is not more than 5min, so that the production time is saved. The hydraulic station has the function of intelligently controlling the oil cylinder compression pressure according to the requirements of the production process during working. The pressing pressure of the oil cylinder can be set according to different pressures and temperatures, so that the service lives of the filter plate and the diaphragm plate are effectively prolonged. At least a three-stage oil cylinder compression pressure control function is required, the hydraulic pressure P1 in the feeding stage is automatically increased step by step along with the change of the feeding pressure, the squeezing stage is increased to P2, the vacuum stage is decreased to P3, and the P value can be set and adjusted according to the field process conditions.

When the hydraulic system works and the pressure of the oil cylinder reaches the upper limit value, the control system stops the oil pump from working, and the oil pump is in a pressure maintaining state. When the pressure is reduced to the lower limit value, the control system starts the oil pump, the oil pump works again, and the pressure is increased to the set upper limit value again.

After the feeding and filtering are finished, high-pressure water enters the cavity of the diaphragm to extrude a filter cake, and filter pressing and dewatering are carried out. And after the filter pressing is finished, the compressed air is used for blowing the central hole of the filter plate and the feeding pipeline.

The heating cycle system includes: steam heating water tank, hot water pump, pipeline, valves, etc.

After the filter pressing is finished, hot water is injected into the filter plate through the hot water pump, the heating surface of the filter plate is rapidly heated, a filter cake is further heated, a heat source is provided for subsequent vacuum drying, and the hot water flows back through the hot water preparation device to be heated again and then enters the filter plate to form closed circulation.

The configuration of the heating system can be selected from a gas-fired hot water boiler, a smoke waste heat boiler, an oil-fired hot water boiler, an electric hot water boiler, steam or factory hot water and the like according to different projects.

The vacuum system comprises a vacuum pump, a heat exchanger, a gas-liquid separator, a liquid storage tank, a pipeline and the like. The vacuum pump is used for extracting the steam-water mixture in the closed cavity, so that a certain vacuum degree is formed in the cavity, and the boiling point of water is reduced. And condensing the steam-water mixture extracted from the chamber by a circulating water cooler and then discharging, wherein the cooling water comes from plant circulating water. The low-temperature steam which is conveyed by a cooling water pump to enter a condenser and is pumped out in vacuum is subjected to heat exchange, and the residual pressure is utilized to flow back to a plant area.

The compressed air system meets the requirements of process equipment gas and instrument gas, and compressed air is used for purging a central hole of the filter plate and a feeding pipeline.

When the vacuum drying is finished, the piston rod of the oil cylinder retracts, the automatic plate pulling device is started, the filter plates are pulled apart in groups, the filter cakes fall off automatically, and the dried coal slime is conveyed to a slag transport vehicle through conveying equipment.

The electric control system consists of a power distribution system, a PLC system, an online monitoring instrument and the like, so as to realize automatic or manual operation functions of feeding, filter pressing, vacuum drying, discharging and the like. The electric control system can adjust the operation technological parameters of the system on site, has the functions of operation state display, fault alarm and the like, is provided with an emergency stop device, and can effectively protect the safety of workers. The system can be operated through a PLC touch screen matched with the system, an industrial personal computer can be configured, and an operator can operate on the computer.

The method of the device is a low-temperature vacuum drying process, the temperature of a heating medium is 85-105 ℃ hot water, the process is operated in a totally closed negative pressure mode, filter cakes do not dynamically contact with other operation parts after entering a drying system, and the device has no hidden wear danger and dust explosion danger and no dust and odor emission. Safety measures such as inert gas protection and the like do not need to be considered in the running or shutdown process of the equipment. By controlling the heat source before discharging, the temperature of the filter cake is effectively reduced along with the evaporation of water.

The hot water with lower enthalpy is used as a heating medium, so that the method is safer and more economical than directly using high-pressure commodity steam, and the drying operation cost is low; the mode of indirect heating and cyclic utilization of hot water is used, and the heat loss is extremely small.

The filter plate meets the process requirements of dehydration and desiccation in the application of many practical engineering projects under harsh working conditions, and the quality is completely ensured. The design and processing of the nonmetal PP outer frame greatly reduce the environmental loss of heat and save energy cost. The diaphragm membrane and other accessories of the filter plate are detachable, the diaphragm can be replaced very conveniently after the filter plate is used for many years (the design life is 10 years), the whole filter plate does not need to be replaced, and the operation cost is saved. The structural design is obviously superior to the integral filter plate with the metal frame, and the filter plate does not need to be returned to a factory for repairing. The filter cloth adopts a unique process.

The working process of the device realizes all automatic integrated control, the system has simple structure, convenient operation, no need of manual intervention in operation, low labor intensity and simple maintenance.

In order to clean the filter cake residues on the filter cloth, the device is also provided with a filter cloth shaking mechanism. The filter cloth shaking mechanism comprises a spiral beam 1 and a plurality of connecting parts 2 arranged on the spiral beam 1, the connecting parts 2 are arranged on the filter cloth, the spiral beam 1 comprises a plurality of bent parts 11 and straight parts 12, and the bent parts 11 and the straight parts 12 are arranged in a staggered mode; the two ends of the spiral beam 1 are provided with supporting bearing seats 31 to provide rolling supporting function; the supporting bearing seat 31 is arranged on the lifting base 3; one end of the spiral beam 1 is provided with a gear 13, a motor 4 is arranged on the lifting base 3 at the position, and an output shaft of the motor 4 is provided with a driving gear and is connected with the gear 13 in a meshing manner and drives the gear to rotate.

The motor 4 is utilized to drive the spiral beam 1 to rotate, so that the connecting part 2 on the bent part 11 can rapidly shake up and down, the filter cloth can shake, and residues can be shaken off.

A quick-connection plug 14 is arranged at the other end of the spiral beam 1, the spiral beam 1 is arranged in a hollow manner, and the other end of the spiral beam is plugged to avoid air leakage; the straight part 12 of the spiral beam 1 is provided with an exhaust hole facing the bent part 11 of the corresponding side, and the quick plug 14 is used for connecting an exhaust pipe of a high-pressure air pump. Then high-pressure air is sprayed on the filter cloth to blow off the residues firmly adhered.

The bent part 11 is provided with an annular groove 111, the connecting part 2 is provided with a waist-shaped annular groove 21, and the bent part 11 is clamped in the waist-shaped annular groove 21 and is prevented from being separated by the annular groove 111; the width of the waist-shaped ring groove 21 is larger than the inner diameter of the ring groove 111 and smaller than the outer diameter of the bent portion 11.

The host system is provided with a fixed base 33, a plurality of corrugated pipes 32 are arranged on the fixed base 33, the tops of the corrugated pipes 32 support against the corresponding lifting base 3, and the corrugated pipes 32 are connected with a high-pressure air pump.

For some highly viscous residues, they need to be moved up and down with a large stroke to shake them off. And the structural scheme of adopting motor and spiral beam, there is the restriction in the stroke. Therefore, the device is provided with the corrugated pipe 32, and the corrugated pipe is continuously inflated and deflated by using the high-pressure air pump, so that the up-and-down movement of a large stroke is realized, and the shaking-off effect is realized.

In order to obtain the most excellent effect, the inflation/deflation operation and the rotation of the spiral beam may be combined, that is, the rotation and the vertical movement may be performed simultaneously.

The connecting parts 2 are arranged at two ends of the filter cloth top beam, and each filter cloth is provided with two connecting parts 2. The main system of the device requires two spiral beams 1.

And if the host system is large in size, the two spiral beams 1 cannot meet the requirements, a plurality of spiral beams can be arranged, and the spiral beams 1 in the middle are connected and arranged at the connecting part 2 in the middle section of the filter cloth top beam. In order to ensure sufficient strength, the connection part 2 installed at the middle section of the filter cloth is provided with a connection column 22, and the connection column 22 is used for installing the connection part 2 on the filter cloth and has a length greater than the height of the bent part 11.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The utility model provides a coal system methyl alcohol gasification fine slag degree of depth dewatering device which characterized in that: comprises a host system, a heating system and a vacuum system; the main machine system carries out dehydration work on the fine slag and is provided with a filter cloth shaking mechanism; the heating system flushes circulating hot water into an inner cavity of a diaphragm plate and an inner cavity of a heating plate in the host system so as to heat a filter cake; the vacuum system performs air pumping work on a filter cake cavity in the host system, so that negative pressure is formed in the vacuum system, and the boiling point of water is reduced; the filter cloth shaking mechanism is matched with the unloading system to unload materials.

2. The deep dehydration device for coal-to-methanol gasification fine slag according to claim 1, characterized in that: the filter cloth shaking mechanism comprises a spiral beam (1) and a plurality of connecting parts (2) arranged on the spiral beam (1), the connecting parts (2) are arranged on the filter cloth, the spiral beam (1) comprises a plurality of bent parts (11) and straight parts (12), and the bent parts (11) and the straight parts (12) are arranged in a staggered mode; two ends of the spiral beam (1) are provided with supporting bearing seats (31) to provide a rolling supporting effect; the supporting bearing seat (31) is arranged on the lifting base (3); one end of the spiral beam (1) is provided with a gear (13), a motor (4) is arranged on the lifting base (3) at the position, an output shaft of the motor (4) is provided with a driving gear, and the driving gear is connected with the gear (13) in a meshing manner and drives the gear to rotate.

3. The coal-to-methanol gasification fine slag deep dehydration device according to claim 2, characterized in that: a quick-connection plug (14) is arranged at the other end of the spiral beam (1), the spiral beam (1) is arranged in a hollow mode, and the other end of the spiral beam is plugged to avoid air leakage; the straight part (12) of the spiral beam (1) is provided with an exhaust hole facing the bent part (11) of the corresponding side, and the quick-connection plug (14) is used for connecting an exhaust pipe of a high-pressure air pump.

4. The coal-to-methanol gasification fine slag deep dehydration device according to claim 2, characterized in that: the bent part (11) is provided with an annular groove (111), the connecting part (2) is provided with a waist-shaped annular groove (21), and the bent part (11) is clamped into the waist-shaped annular groove (21) and is prevented from being separated by the annular groove (111); the width of the waist-shaped ring groove (21) is larger than the inner diameter of the ring groove (111) and smaller than the outer diameter of the bent part (11).

5. The deep dehydration device for coal-to-methanol gasification fine slag according to claim 3, characterized in that: the host system is provided with a fixed base (33), a plurality of corrugated pipes (32) are arranged on the fixed base (33), each corrugated pipe (32) is abutted against the corresponding lifting base (3), and the corrugated pipes (32) are connected with a high-pressure air pump.

6. The deep dehydration device for coal-to-methanol gasification fine slag according to claim 4, characterized in that: the connecting part (2) arranged at the middle section of the filter cloth is provided with a connecting column (22), the connecting column (22) is used for installing the connecting part (2) on the filter cloth, and the length of the connecting column is greater than the height of the bent part (11).

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