CN213578485U - Coal drying, dedusting and feeding system utilizing flue gas for heating - Google Patents

Abstract

The invention discloses a coal drying, dedusting and feeding system heated by flue gas, which comprises a conveying and storing system, a drying system, a dedusting and desulfurizing system and a sealing and feeding system, wherein the drying system comprises a roller with a driving device, a feeding seal box is arranged at the inlet end of the roller, and a discharging seal box is arranged at the outlet end of the roller; the roller is at least one stage; the dust removal and desulfurization system comprises a dust remover, an induced draft fan and a desulfurization device which are sequentially connected, wherein the dust remover is communicated with a hot air outlet end of the drying system; sealed feed system include the second holding vessel, the second screw means, feed cylinder and reation kettle are connected gradually to the second holding vessel, the feed cylinder on set up ash handling equipment, the feed cylinder in the helical blade cross section be not more than the 3/4 of cylinder internal cross section.

Description

Coal drying, dedusting and feeding system utilizing flue gas for heating

Technical Field

The utility model belongs to the technical field of the clean preliminary treatment of coal material, comprehensive utilization, energy saving and emission reduction technique and specifically relates to an utilize coal stoving dust removal and charge-in system of flue gas heating.

Background

China is a country with more coal, less oil and poor gas, and in the petrochemical energy reserves proven in China, oil and natural gas only account for 6 percent, and the rest 94 percent are coal substances. The resource characteristics determine that China mainly builds energy structures by using coal substances.

The usage and storage of coal in China are more low-rank coal, and the contribution of sulfur dioxide, nitrogen oxide and other main atmospheric emission total amount coal accounts for more than two thirds. Clean and efficient utilization is mainly carried out in two directions, namely tail end treatment, ultralow emission after coal combustion and clean utilization of a source. The coal is cleaned and pretreated and then is made into raw materials or high-quality fuel, the traditional utilization path is changed, and the existing utilization mode can be greatly changed from the aspects of economy and environmental protection.

The coal substance composition comprises two main types of organic substances (carbon, oxygen, nitrogen, sulfur and the like) and inorganic substances (water and mineral substances). The heat generated by organic matter combustion is the energy value of the organic matter, and the moisture absorbs heat and is changed into steam when the coal substance is combusted, so that the calorific value and the market value of the coal substance are influenced, and potential safety hazards caused by unstable furnace pressure are brought.

Therefore, the removal of moisture has a non-trivial meaning for the comprehensive utilization of coal materials. At present, a plurality of drying devices for single coal substances exist, but a plurality of complete system devices exist. The utility model with publication number CN107504789A discloses a clean molded coal drying device, which comprises a drying furnace, wherein the top of the drying furnace is provided with a feed inlet, the bottom of the drying furnace is provided with a discharge outlet, the drying furnace is connected with a blower through a hot air pipeline, a heat dissipation blast pipe is arranged in the drying furnace, the heat dissipation blast pipe is in a spiral ascending shape, the heat dissipation blast pipe is communicated with the hot air pipeline, and a plurality of ventilation holes are arranged on the heat dissipation blast pipe; an umbrella-shaped material distribution disc is arranged in a feeding hole on the drying furnace; the drying furnace is connected with a suction fan through a dust removal pipeline, and the air exhaust end of the suction fan is connected with a recovery device. Above vertical drying device produces while, can't guarantee coal when the continuous ejection of compact divides even, medium exchange abundant, moisture evaporation thoroughly, and the coal material water content of drying often can't reach the anticipated standard. And the inclination of the front-mounted transmission system of the vertical drying device is larger, and the energy consumption of the equipment is higher.

Publication No. CN101985558 discloses a coal substance's decomposition equipment, including a sealed kiln body that has feed inlet and discharge gate, internal flame gas pipeline heating mechanism that sets up of kiln, the coal substance that forms between flame gas pipeline heating mechanism and the kiln body inner wall impels the decomposition passageway, set up the coal decomposition gas collecting pipe that communicates with coal substance impels the decomposition passageway on the kiln body. The equipment can decompose the powder coal into fuel gas, tar gas and coal with higher heat value, but the treatment capacity is small, and the industrial application is difficult.

Meanwhile, the particle coal extraction can be continuously produced, high-temperature dust can be efficiently removed, and integrated equipment for continuous large-scale production hardly exists in China, and the production of dust treatment needs to be stopped for half a month.

SUMMERY OF THE UTILITY MODEL

For solving exist not enough among the prior art, the utility model provides a simple structure, drying efficiency are high, and the dust removal desulfurization accords with the environmental protection requirement, can continuous feeding simultaneously, and high-efficient high temperature removes dust and produces gas in succession, and the coal stoving dust removal and the charge-in system of utilizing the flue gas heating of continuous industrialization mass production. Under the conditions of low temperature, no oxygen and no need of external water, high-value petroleum, natural gas and water in the coal are separated through cleaning pretreatment to obtain high-calorie anthracite, and the anthracite can be further processed to obtain a new coal-based material with high additional value.

The utility model discloses the concrete technical scheme who adopts as follows: comprises a conveying and storing system, a drying system, a dedusting and desulfurizing system and a sealed feeding system,

the conveying and storing system comprises a first conveying device for conveying raw coal, the first conveying device is connected with a first storage tank, the outlet end of the first storage tank is connected with a second conveying device, and the second conveying device is connected with a drying system;

the drying system comprises a roller with a driving device, wherein a feeding seal box is arranged at the inlet end of the roller, and a discharging seal box is arranged at the outlet end of the roller; the roller is at least one stage;

the dust removal and desulfurization system comprises a dust remover, an induced draft fan and a desulfurization device which are sequentially connected, wherein the dust remover is communicated with a hot air outlet end of the drying system;

sealed feed system include the second holding vessel, the second screw means, feed cylinder and reation kettle are connected gradually to the second holding vessel, the feed cylinder on set up ash handling equipment, the feed cylinder in the helical blade cross section be not more than the 3/4 of cylinder internal cross section.

The conveying device comprises a spiral conveying device, a scraper conveying device, a bucket elevator, a roller conveying device and the like.

The adjacent middle grooves of the scraper conveyor can be bent in a limited degree in the horizontal and vertical planes, so the scraper conveyor is called a bendable scraper conveyor. The working face conveyor with the machine body arranged at the intersection of the working face and the haulage roadway in a 90-degree bending mode is called a corner scraper conveyor. In the current coal mining face, the scraper conveyor not only serves to convey coal and materials, but also serves as a running track of a coal mining machine, so that the scraper conveyor becomes an indispensable main device in the modern coal mining process. The scraper conveyor can keep continuous operation, and the production can be normally carried out. Otherwise, the whole coal face will be in a production stop state, so that the whole production is interrupted. The scraper conveyor is dragged by a scraper chain to convey bulk materials in the groove. The scraper conveyor can be used for horizontal transportation and can also be used for inclined transportation. The device has the advantages of solid structure, simple structure, capability of feeding or discharging at any point on the conveying length, airtight shell, capability of preventing dust from flying to pollute the environment during conveying materials and the like.

The screw conveyer is commonly called a packing auger, and is suitable for horizontal conveying, inclined conveying, vertical conveying and other forms of granular or powdery materials. The conveying distance is different according to different deformities, generally from 2 meters to 70 meters, and the spiral conveyor is used for transferring materials between two adjacent rollers, comprises a shaftless spiral and a shafted spiral, and can also be arranged into a multi-stage spiral propeller; the selection of which conveyor body can be determined according to the material conveying capacity, the material components, the gradient and the attractiveness of the drying device.

Preferably, the first conveying device, the second conveying device and the third conveying device can be scraper conveyors.

Preferably, the first screw means may be selected from a shaft screw.

The main function of first holding vessel be the storage material, play a storage, the effect of buffering, including cuboid and cylinder structure. Generally, a cylindrical structure is adopted, and an inverted conical structure is adopted at the bottom. This allows the maximum material to be stored with the minimum amount of material. The size of the storage tanks and the number of tanks are determined according to the actual processing capacity and demand.

Preferably, the first storage tank may have a cylindrical structure.

The roller is a single-stage or multi-stage device according to production requirements, can be in a serial and parallel structure sequentially, and can also be in a serial and parallel structure, and is specifically determined according to the production requirements and field arrangement. In order to ensure that the pulverized coal is not reversely blown out by the high-pressure hot air from the inlet of the feed inlet in a counter flow manner, a spiral propeller can be used for feeding. The material drying can be divided into indirect drying and direct drying, and the direct hot air is in contact with the powdered coal, so that the drying efficiency is the highest. The two ends of the roller are respectively provided with a hot air inlet and a hot air outlet which are used for transmitting hot air to dry the pulverized coal.

Preferably, the drying system adopts direct hot air to be in contact with the pulverized coal for drying.

In order to ensure the sealing performance of the two ends of the roller, the hot air inlet and the hot air outlet, the feeding seal box and the discharging seal box are respectively arranged at the two ends of the roller, and the discharging seal box and the feeding seal box are respectively connected with the roller through a dynamic and static sealing device, so that the phenomenon of air leakage at the joint of the discharging seal box, the feeding seal box and the roller is prevented, if the phenomenon of air leakage exists, materials are easily stacked, heat is stored, and safety accidents such as fire disasters are caused due to the easy spontaneous combustion. The hot air inlet is arranged on the side surface or the front surface of the feeding sealing box, and the hot air outlet is arranged on the top or the side surface of the discharging sealing box. The arrangement of the feeding seal box and the discharging seal box ensures that the hot air inlet and the hot air outlet are independent from the roller and do not interfere with each other; meanwhile, the feeding seal box and the discharging seal box are arranged to buffer the input hot air to a certain extent, and the hot air is guaranteed to uniformly pass through the inner cavity of the roller.

The feeding sealing box comprises a feeding hole and a hot air inlet, and the feeding hole is arranged at the top end or the upper part of the side surface of the feeding sealing box; the discharging sealing box comprises a discharging port and a hot air outlet, and the discharging port is arranged at the bottom end or the lower part of the side face of the discharging sealing box.

Two guide plates arranged at a certain included angle are arranged at a discharge port in the discharge sealing box, and the guide plates are beneficial to the material in the roller to enter the third conveying device; the feeding seal box and the discharging seal box are respectively matched with the roller in a sealing way, and the pulverized coal enters the roller through the inlet of the feeding seal box and then is discharged out of the roller from the outlet at the bottom of the discharging seal box.

The first screw device is in sealing connection with the feeding hole, the first screw device plays a role in sealing besides automatic feeding, hot air with certain pressure in the roller is prevented from flowing out of the first screw device, preferably axial screw is adopted, and the sealing performance is good.

The inner wall of the roller is provided with L-shaped lifting blades which are distributed along the inner wall of the roller in a surrounding way. The material raising plate ensures that the material is uniformly heated, and the drying efficiency and the separation efficiency of the whole device are improved; the number of the material raising plates can be determined according to actual needs. Arrange the lifting blade at the cylinder inner wall, guarantee that the powder coal constantly rolls when the cylinder, the material is heated evenly for drying speed reduces the caking of powder coal.

But the cylinder level arrange also the slope and arrange, when the level was arranged, the integrated device elegant appearance, neatly, and it is little to actuating mechanism and stop device coefficient of friction, do benefit to the production life who improves conveyor such as cylinder, the level is arranged except that the drive power that brings is marchd forward by hot-blast, mainly drive the material by the L type lifting blade in the cylinder and march forward, mainly have certain slope contained angle through the L type lifting blade and realize, the L type lifting blade can drive the material except that stirring, can also drive the material and advance slowly. The forward advancing speed of the material depends on the rotating speed of the roller and is also greatly related to the inclination angle of the L-shaped lifting plate, and is specifically determined by the processing capacity of the quality-improving drying system of the pulverized coal.

When the roller is obliquely arranged, the installation heights are the same, and the end of the roller, which is provided with the discharge hole, is at a low position. The size and the length of the inner diameter and the outer diameter of the roller can be determined according to the actual processing capacity of the actual quality-improving system of the powdered coal. The roller and the horizontal plane are arranged to be in a certain inclination, the front end of the roller is higher than the rear end of the roller, materials such as pulverized coal and the like are automatically conveyed under the action of self gravity and hot air, the continuous automatic operation of the whole device is ensured, and the energy consumption is reduced.

The driving device of the roller comprises a toothed ring on the peripheral surface of the roller, a riding wheel meshed with the toothed ring and a motor for driving.

Preferably, a limiting device is arranged at the position of the riding wheel to prevent the roller from sliding downwards. The utility model discloses a stop device can select protruding annular step of establishing at the riding wheel both ends, set up with outer loop matched with spacing groove in the riding wheel outer peripheral face, set up the recess in outer loop department, set up with forms such as recess complex spacing arch in the riding wheel outer peripheral face.

The roller comprises a plurality of stages which are sequentially connected in series, in parallel or in a mixed manner of series connection and parallel connection. In a flat or inclined arrangement.

The second screw device is of a shaftless screw structure or a shafted screw structure.

The materials between the rollers are conveyed through a third conveying device.

The discharging sealing box and the feeding sealing box are respectively provided with an access hole; and a heat-insulating layer is arranged outside the roller.

The feeding cylinder and the reaction kettle are connected with a dynamic and static sealing device through a metal compensator.

A second valve and a third valve are respectively arranged at the feed inlet and the discharge outlet of the second storage tank; and a fourth valve is arranged at the feed inlet of the feeding barrel.

For guaranteeing the stoving effect of powder coal, the utility model discloses set up multistage drying device, under the relatively poor condition of one-level drying device effect, set up second grade drying device, the principle is the same with one-level drying device. If the effect of the secondary drying device still cannot meet the requirement of a subsequent coal high-temperature utilization system and the water content is higher, a tertiary drying device can be set up. And the multi-stage drying devices are mutually independent and can be independently operated, and the operation is specifically determined according to the moisture content of the pulverized coal, the weather temperature, the humidity and the climate in four seasons.

The dust remover comprises a bag type dust remover, an electric dust remover and the like. The dust hood is arranged at each ash emission place, dust-containing gas is conveyed into the dust removal device through a pipeline gas path, the dust is collected in the dust removal device after gas-solid separation is carried out in the dust removal device, the clean gas is introduced into a header pipe or is directly discharged into the atmosphere, namely, the dust removal system, and the dust remover is an important group part in the system. From the perspective of ventilation and dust removal, dust is all small solid particles which can exist in air in a floating state for a long time, and is a dispersion system called aerosol, wherein air is a dispersion medium, and solid particles are a dispersion phase. A dust separator is a device that separates such small solid particles from an aerosol.

The working principle of the dust remover is as follows: the dust-containing gas enters the filter chamber through the lower open flange, the coarse particles directly fall into the dust bin, the dust-containing gas is filtered by the filter bag, the dust is retained on the surface of the bag, and the purified gas is delivered to the gas purifying chamber through the bag opening and is discharged into the atmosphere by the fan. When the dust on the surface of the filter bag is continuously increased, the program control instrument starts to work, the pulse valves are opened one by one, compressed air is enabled to blow and clean the filter bag through the nozzle, the filter bag is enabled to expand suddenly, the dust given to the surface of the bag is enabled to be rapidly separated from the filter bag and fall into the dust bin under the action of reverse airflow, and the dust is discharged through the dust discharge valve. The dust remover mainly comprises an upper box body, a middle box body, an ash bucket, an air inlet flow equalizing pipe, a support filter bag, a blowing device, an ash discharging device and the like. The application of the bag type dust collector has been in the history for more than one hundred years, and the bag type dust collector has the greatest advantages of high dust collection efficiency which reaches more than 99.99 percent and discharge concentration which can reach 10mg/m³The following, and the classification efficiencyThe particle size is high, and the particle size has good trapping efficiency on fine particles with the particle size of less than 2.5 mu m, so the particle size is widely applied.

Preferably, the dust remover of the utility model can select a bag type dust remover.

The induced draft fan is a device which generates negative pressure through the rotation of an impeller and further extracts air from a system, is generally arranged at the tail end of the system and is used for extracting hot smoke in the device. The utility model discloses install the rear end at the dust remover, lean on the draught fan negative pressure to the hot flue gas in the cylinder and the gas in the dust remover to drive.

Preferably, the induced draft fan can be a conventional commercially available induced draft fan, and the method meets the production capacity.

The desulfurization device is a small desulfurization and dust removal device and is often called a desulfurization dust remover. In the desulfurizing tower and the desulfurizing dust remover, the flue gas containing SO2 is subjected to chemical absorption on SO2 in the flue gas. In the process of absorbing and purifying SO2, the flue gas with low concentration SO2 is treated, the flue gas amount is considerable, and the flue gas is required to be continuously and efficiently purified instantly. Therefore, the chemical reactions involved in SO2 should be extremely fast, the values of the conversion coefficients in the membranes are large, and the reactions occur in the membranes, SO that it is appropriate to select an absorption tower with a continuous gas phase, a high turbulence degree and a large phase interface as the desulfurizing tower and the desulfurizing dust remover. Generally, spray towers, packed towers, spray towers, tray towers, venturi absorption towers, and the like can satisfy these requirements. The spray tower is one of the most widely used desulfurization towers, has the advantages of simple structure and mature and reliable process, and is widely applied to large-scale power plants and medium and small-sized low-sulfur flue gas treatment; for high-sulfur flue gas treatment, the colored industry mainly uses a pneumatic emulsification desulfurizing tower, a multilayer spray tower and the like.

Preferably, the desulfurization device can adopt a spray desulfurization mode.

The second spiral device is mainly used for conveying the pulverized coal in the storage tank to the rear end, needs to be conveyed in a sealing mode and comprises a shaftless spiral and a shafted spiral.

The screw conveying tail end extends for a certain distance properly, and the length of the extending distance can be determined according to the practical effects of the size of the second storage tank, the material production amount and the like. The bottom discharge spiral conveying can adopt parallel conveying or certain inclination conveying, the inclination conveying can enable materials to be more easily concentrated on one point, the produced dead angle is only at the conveying end, and field personnel can solve the problems of blockage or impurities such as pulverized coal particles accumulated in the dead angle only by regularly opening the end blind plate for cleaning.

Preferably, a shaftless spiral may be selected because the centre of the shaftless spiral is a concentric circle; and secondly, the use of the shaftless screw can save more materials than the material conveyed by the shaftless screw under the condition of low temperature at a certain flow rate in unit area, thereby saving the material of the circular pipe.

The valve is mainly used for opening or closing the pulverized coal conveying and comprises a ball valve, a gate valve, a butterfly valve and the like. The ball valve has the action of rotating 90 degrees, and the cock body is a sphere and is provided with a circular through hole or a channel passing through the axis of the sphere. The ball valve is mainly used for cutting off, distributing and changing the flow direction of a medium in a pipeline, and can be closed tightly only by rotating 90 degrees and a small rotating moment. The ball valve is most suitable for being used as a switch and a stop valve. The gate plate of the gate valve moves linearly along with the valve rod, and is called a lifting rod gate valve and a rising rod gate valve. Usually, the lifting rod is provided with trapezoidal threads, and the rotating motion is changed into the linear motion, namely the operation torque is changed into the operation thrust force through a nut at the top end of the valve and a guide groove on the valve body. The butterfly valve opening and closing piece is a disc-shaped butterfly plate and rotates around the axis of the butterfly plate in the valve body, so that the valve which is opened, closed or adjusted is called a butterfly valve. The selection of the valve can be determined according to the field and production requirements.

Preferably, the first valve and the second valve can be ball valves with strong practicability and low cost, and the third valve and the fourth valve can be pneumatic gate valves.

The front end of the feeding cylinder is connected with a second storage tank and a second screw device which are respectively connected by a third valve and a fourth valve, and the valves have two functions, namely, opening or closing the material; and secondly, the gas is locked to prevent the high-temperature gas in the reaction kettle from flowing up in the reverse direction under the action of pressure.

The middle part of the feeding cylinder body is communicated with the bottom of an ash removal device, and the tail end of the feeding cylinder body is connected with the reaction kettle through a metal compensator and a dynamic and static sealing device.

The quantity and the size of the second storage can be determined according to the daily throughput of the reaction kettle, the purpose is to store and buffer the feeding of the feeding barrel, when the second screw device is started, the third valve is automatically opened, the material of the second storage has a certain height, the compaction height of the material can block the pressure of the gas in the reaction kettle to prevent leakage, meanwhile, the second storage cannot completely discharge the material, otherwise, high-temperature oil gas in the reaction kettle flows out through the opened third valve in a reverse flow mode, so the second storage is generally provided with a material level alarm, and when the quantity and the size are lower than a certain value, automatic alarm and automatic feeding are realized.

Feeding barrel internally mounted have shaftless helical blade, the cross section of blade must not be greater than 3/4 of barrel internal diameter cross section, and it is here the utility model discloses an important innovation point is a more reasonable diameter that obtains on the basis of a large amount of experiments, and feeding barrel internal pipe is the route of giving vent to anger of high temperature oil gas promptly, also is the feed path of powder coal, consequently, how much of inside heat exchange degree has also decided the loss of reation kettle energy. Can take 5 ~ 20 meters generally, the usable heat preservation cotton heat preservation in the feeding barrel outside simultaneously to make the abundant heat exchange of powder coal and high temperature oil gas.

The conveying screw can adopt a shaftless screw and a shafted screw, and the shaftless screw is suggested to be adopted, because the screw has no shaft, the material is not easy to block, and the discharge port is not blocked, so that the conveying screw can be operated at a lower speed, the transmission is stable, and the energy consumption is reduced; the conveying capacity is 1.5 times of that of a traditional shaft screw conveyor with the same diameter; the material can be discharged from the lower part and the end; the machine can work at high temperature by using a special lining plate.

Preferably, the shaftless spiral of the feeding cylinder has a certain length, which can be 10-15 m, is too short to be beneficial to heat exchange and sealing, and is too long to be transported at high temperature to be easy to deform and even break.

The inner diameter, the thickness and the length of the feeding cylinder body can be determined according to the treatment capacity of the actual reaction kettle; in the practical use process, the shaftless screw is connected with the driving motor.

The utility model discloses utilize the upper portion of carrying the spiral and the clearance of giving vent to anger between the feed cylinder inner wall, high temperature oil gas is discharged from the feed end in the reation kettle, and its advantage lies in controlling the reation kettle rear end and carries the temperature of matter back powder grain coal, and it is required to reach the product, reduces the temperature in the reation kettle, realizes serialization large-scale production, need not stop the cauldron operation.

The dust removing device mainly has the main function that dust-containing high-temperature oil gas discharged from the reaction kettle is used for blocking or capturing dust under the action of the dust removing device, and the high-temperature oil gas enters the next cooling and separating device. The ash removing device comprises gravity dust removal, inertia dust removal, cyclone dust removal, electric dust removal and the like

The cyclone dust collector is characterized in that a dust-containing airflow makes a rotary motion, dust particles are separated from the airflow by virtue of centrifugal force and collected on the wall of the cyclone dust collector, and then the dust particles fall into an ash hopper by virtue of gravity. Each part of the cyclone dust collector has a certain size proportion, and the efficiency and the pressure loss of the cyclone dust collector can be influenced by the change of each proportion relation, wherein the diameter of the dust collector, the size of the air inlet and the diameter of the exhaust pipe are main influencing factors. In use, it should be noted that when a certain limit is exceeded, the favorable factors can also translate into unfavorable factors. Further, some factors are advantageous for improving the dust removal efficiency, but increase the pressure loss, and thus adjustment of each factor must be compatible. However, the biggest problem of cyclone dust removal is that the air volume must be ensured to be stable, and high-temperature oil gas contains water vapor, asphalt, hydrophilic and sticky dust, has complex components, is not easy to fall off after being adhered to the wall, and is not proper unless being blown by oil gas regularly.

Electrostatic dust removal is one of the methods of gas dust removal. The dust-containing gas is electrically separated when passing through a high-voltage electrostatic field, and dust particles and negative ions are combined to be charged negatively and then tend to discharge on the surface of the anode to be deposited. Electrostatic precipitator types can be broadly divided into the following categories: the method is divided into vertical and horizontal according to the airflow direction, plate and tube according to the precipitation pole type, and dry and wet according to the dust removing method on the precipitation pole plate. The advantages are high purifying efficiency, small resistance loss, high allowable operation temperature, large gas treating range and full realization of automatic control of operation. The disadvantages are that the equipment is relatively complex and requires high levels of equipment allocation, transportation, installation and maintenance management. The specific resistance of the dust has certain requirements, so the dust has certain selectivity, and the high purification efficiency of all the dust cannot be obtained. The influence of the operating conditions such as the temperature of the gas, the temperature and the like is large, and meanwhile, the dust is operated at different temperatures and humidity, the obtained effect is different, the using effect of some dust at a certain temperature and humidity is good, and the electric dust collector can not be used due to the change of the dust resistance at another temperature and humidity.

The gravity dedusting utilizes the principle that the specific gravity of dust is different from that of gas, so that the raised dust naturally settles down from the gas by the gravity of the raised dust. The device is a relatively original purifying device with simple structure, large volume, small resistance, easy maintenance and low efficiency, and can only be used for coarse purification.

The inertial dust collector is also called as an inert dust collector. The principle of the method is that the dust is separated from the gas by utilizing the difference of inertia force between the dust and the gas in the movement. Generally, some form of obstruction is placed in front of the dusty gas stream, causing the direction of the gas stream to change dramatically. At this time, the dust particles are separated from the gas flow and discharged after the gas obtained by purification changes its direction sharply because the inertia force is much larger than that of the gas. The dust remover has simple structure, small resistance and low purification efficiency (40-80%), and is mainly used for the first stage during multi-stage purification, and concentration equipment during purification or matched with other purification equipment.

The utility model discloses an ash handling equipment is on several kinds of devices commonly used basis, still at ash handling equipment internally mounted there is high temperature resistant, oleophobic hydrophobic macromolecular material, this kind of material enables dust high temperature oil gas when bumping the wall with ash handling equipment, when the dust slowly gathers the certain degree, under the effect of factors such as self gravity or external wind-force, can freely fall into the bottom, can not stick together with the device, thereby make the device lose the ash handling function, the ash handling equipment is inside at macromolecular material many places installation high pressure oil gun simultaneously, sweep automatically, can not make the dust parcel live macromolecular material and make its inactivation, the utility model discloses greatly increased the degree of difficulty of high temperature oil gas dust, the dust feeding barrel that falls into gets into the reation kettle reaction once more through the auger delivery in.

Preferably, a metal compensator is arranged at the joint of the feeding cylinder and the reaction kettle, and a temperature sensor and a pressure sensor which are remotely controlled and monitored on site are respectively arranged at the top end of the metal compensator.

The metal compensator is used as a flexible pressure-resistant pipe fitting, utilizes the effective telescopic deformation of the working main body corrugated pipe to absorb the dimensional change of pipelines, conduits, containers and the like caused by expansion with heat and contraction with cold or compensate the axial, transverse and angular displacement of the pipelines, conduits, containers and the like, absorbs vibration energy, can play a role in vibration reduction, noise reduction and the like, and has the characteristics of good flexibility, light weight, corrosion resistance, fatigue resistance, high and low temperature resistance and the like.

The dynamic and static sealing device mainly comprises a gland assembly, a reinforced flexible graphite disc, a sealing outer ring assembly, a sealing inner retainer ring assembly and the like.

The gland assembly is formed by assembling and welding a flange, a seamless steel pipe and a pressure ring. As the gas generated in the working process of the cracking furnace has no corrosiveness, and the temperature of the gas is about 200-400 ℃. Therefore, the compression ring assembly can meet the technological requirements by adopting common carbon structural steel, and the sealing tightness of the graphite packing can be adjusted by adjusting the length of the pressing cover penetrating into the sealing outer ring.

The reinforced flexible graphite packing overcomes the defects of low tensile strength, poor flexibility, poor rebound resilience, low air tightness and the like of a pure graphite material; but also has good temperature resistance, oxidation resistance, corrosion resistance and better compression performance. Meanwhile, the graphite has excellent characteristics; therefore, the sealing material is used as an important sealing element in the structures of the cracking furnace and the spiral sealing device; the axial flexibility, the radial lubricity and the comprehensive performance of the lubricating oil are also utilized;

preferably, the number of windings in this construction is 8-12.

The sealing outer ring assembly is formed by assembling and welding a flange, a connecting pipe and a pressure ring, and the sealing inner check ring is formed by welding a steel pipe and a circular ring; the graphite packing is wound between the two and is matched with the three to play a sealing role in the radial direction and the axial direction through friction sealing.

The reaction kettle is a rotatable mechanism, so that materials in the reaction kettle can be uniformly heated; a heating box is arranged outside the reaction kettle, and a heat conduction pipe penetrating through the reaction kettle is arranged and communicated with the heating box; the heat conduction pipes are arranged perpendicular to the axis of the reaction kettle, and two adjacent heat conduction pipes are vertically staggered.

The reaction kettle is internally provided with a guide plate which is obliquely arranged and has a spiral structure, the guide plate is divided into a guide steel plate and a guide stainless steel plate, and the guide plate can adopt a single-spiral structure or a double-spiral structure and can also adopt a single-double combined spiral guide structure; in the rotating process of the reaction kettle, the guide plate which is obliquely arranged has a guide effect on materials in the reaction kettle, and the materials in the reaction kettle move towards the discharge hole under the effect of the guide plate, so that the materials in the reaction kettle are discharged.

The reaction kettle in this embodiment is a progressive circulation type continuous production reaction device, which is provided with 6-15 wireless temperature controllers inside, used for monitoring the temperature of the interval, when the temperature of the discharge hole of the equipment does not reach the designated temperature (500-800 ℃), the specific temperature is determined by different products, the temperature sensor transmits signals to a computer and an alarm device to remind the working personnel, the product does not meet the qualified requirement, and the measures are mainly taken as follows, the reaction kettle can be reversed, so that the material which is fast to the outlet enters the reaction kettle again for full reaction, the retention time is prolonged, meanwhile, the heating is continued, the reverse rotation time of the reaction kettle is 30min-120min, then the reation kettle corotation is waited when the material gets into the discharge gate, and whether seeing temperature sensor reports to the police, if reports to the police, reation kettle reverses again, and is so repeated, guarantees that the product is qualified to roll off the production line. If the temperature sensor displays that the temperature reaches the standard, the pulverized coal enters a discharge hole and enters the next procedure.

For convenient maintenance, the feeding sealing box and the discharging sealing box can be respectively provided with maintenance openings, and the number, the size and the specific positions of the maintenance openings can be determined according to equipment devices and site spaces; the number of the access holes is 1-5, and the inner diameter is between DN 300-800. When the device breaks down, on-site operation personnel accessible manhole maintains the part in the device, closes the manhole after the maintenance is accomplished, and the position that the manhole set up can be confirmed according to actual occasion.

Preferably, the number of the overhaul ports of each device is 1-3, and the inner diameter is DN 400-DN 500.

In order to prevent manual operation from scalding, and in addition, the full heat utilization and heat exchange can be realized, the heat preservation cotton can be used for heat preservation outside the feeding sealing box, the discharging sealing box and the roller, and the thickness and the heat preservation effect of the heat preservation cotton depend on the temperature inside the device and the requirements of the device.

Preferably, the thickness of the heat-insulating layer is 100 mm-200 mm.

The beneficial effects of the utility model are embodied in:

(1) the utility model discloses a but feeding barrel and ash handling equipment continuous feed, automatic ash handling, the law of conservation of make full use of energy improves the utilization ratio of heat exchange, and the totality reduces the reation kettle temperature to the consumption of the energy has been saved greatly.

(2) The utility model discloses a second holding vessel, second screw means, the simple connection of valve has solved the problem that the unable automatic lock of decades continuous feed was angry, and through the auto-induction of second holding vessel material level inductor, pneumatic gate valve open or close, screw conveyor's material is carried, full sealing connection, and easy operation need not large-scale complicated equipment, for workshop staff greatly reduced the potential safety hazard.

(3) The utility model discloses a cylinder single-stage or multistage, establish ties or parallelly connected, establish ties even and connect parallelly connected the mixed use, specifically arrange according to on-the-spot production ability and scene and decide, such drying system very big improvement the stoving effect of powder coal, greatly reduced follow-up reation kettle's energy consumption, because of the improvement that liquid water becomes high temperature vapor volume several thousand times, the reduction of moisture has greatly improved follow-up cooling arrangement's unit productivity.

(4) The utility model discloses a conventional device's such as dust remover and desulphurization unit outfit for the sulphur content of waste heat flue gas, the dust content all accords with national discharge to reach standard very much, has improved energy utilization simultaneously, accords with the development of clean utilization of coal.

Drawings

Fig. 1 is the structure schematic diagram of a coal drying, dedusting and feeding system using flue gas heating.

Fig. 2 is a cross-sectional view taken along the line a-a in fig. 1.

Fig. 3 is a schematic structural diagram of the transfer and storage system of the present invention.

Detailed Description

The coal drying, dust removing and feeding system using flue gas heating according to the present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-3, a coal drying, dedusting and feeding system heated by flue gas mainly comprises a conveying and storing system 1: comprises a first conveying device 2, a first storage tank 3 with a first valve 4, a second conveying device 5 and a first screw device 6; drying system 10: comprises a roller 11 with a driving device 14, a feeding seal box 18 and a discharging seal box 19 which are connected with the front and the back of the roller 11 in a dynamic and static seal way; dust removal desulfurization system 20: comprises a dust remover 21, an induced draft fan 22 and a desulphurization device 23 which are connected in sequence; sealing the feeding system 30: comprises a second storage tank 31, a second screw device 32, a feeding cylinder 33, an ash removing device 34 and a reaction kettle 37.

The feeding seal box 18 comprises a feeding port 12 and a hot air inlet 13, wherein the feeding port 2 is arranged at the top end or the upper part of the side surface of the feeding seal box 18; the discharging sealing box 19 comprises a discharging port 15 and a hot air outlet 16, and the discharging port 5 is arranged at the bottom end or the lower part of the side surface of the discharging sealing box 15.

An L-shaped material raising plate 17 is arranged on the inner wall of the roller 11. Mainly lean on L type lifting blade 17 in the cylinder 11 to drive and advance forward, L type lifting blade 17 has certain slope to arrange, except can driving turning of material, can also drive the material and slowly advance forward.

The multi-stage rollers 11 are sequentially connected in series or in parallel, the rollers 11 with more than three stages can also be used in series or in parallel, and the single-stage or multi-stage rollers 11 are horizontally arranged and obliquely arranged; the method is determined by factors such as the production capacity of the pulverized coal, local climate and humidity, dryness, site arrangement and the like.

Due to the adoption of the bag-type dust remover 21, the dust removal efficiency of the tail gas is greatly improved; the introduction of the desulfurizing device 23 ensures that the sulfur content of the flue gas discharged into the atmosphere reaches the standard and is discharged, thereby reducing the environmental pollution.

The first valve 4 and the second valve 26 can be selected from ball valves with strong practicability and low cost, and the third valve 27 and the fourth valve 28 can be selected from pneumatic gate valves.

The middle part of the feeding cylinder 33 is communicated with the bottom of an ash removal device 34, and the tail end of the feeding cylinder 33 is connected with the reaction kettle through a metal compensator 35 and a dynamic and static sealing device 36. The feeding cylinder 33 is internally provided with a shaftless helical blade, the cross section of the blade is not larger than 3/4 of the cross section of the inner diameter of the cylinder, 5-20 meters can be taken out generally, and meanwhile, the outer side of the feeding cylinder 33 can be insulated by using insulation cotton so as to ensure that the pulverized coal and the high-temperature oil gas can be subjected to sufficient heat exchange.

The interior of the ash removing device 34 is provided with a high-temperature resistant, oleophylic and hydrophobic polymer material

The dynamic and static sealing device 36 mainly comprises a gland assembly, a reinforced flexible graphite disc, a sealing outer ring assembly, a sealing inner retainer ring assembly and the like.

The reaction kettle 37 is a rotatable mechanism, so that the materials in the reaction kettle 37 can be heated uniformly; a heating box is arranged outside the reaction kettle 37, and a heat conduction pipe penetrating through the reaction kettle 37 is arranged and communicated with the heating box;

the working process of the coal drying, dedusting and feeding system heated by using the flue gas comprises the following steps:

1) the transportation and storage system 1: materials such as pulverized coal and the like in a raw coal storage yard enter a first storage tank 3 with storage, cache and standby functions through a first conveying device 2 under the action of a manually-operated grab bucket, the materials are conveyed to a second conveying device 5 through opening or closing of a first valve 4 at the lower end of the first storage tank 3, the second conveying device 5 can be composed of multi-stage conveying devices and comprises a scraper conveyor, a screw conveyor and the like, and the materials are conveyed to a feeding hole 12 through a first screw device 6.

2) Drying system 10: the driving device 14 drives the roller 11 to rotate, materials such as particle coal and the like enter at the feeding hole 12 of the feeding seal box 18, hot air such as residual heat smoke enters from the hot air inlet 13, the materials in the roller 11 freely fall and slowly move forward under the continuous rolling of the L-shaped lifting blade 17, the materials are fully contacted with the hot air for drying, and then the materials are discharged from the discharging hole 15 of the discharging seal box 19, enter the third conveying device 25 if necessary and then enter the roller 11 of the next circulation until the drying meets the requirement;

3) dust removal desulfurization system 20: the residual heat flue gas with a certain amount of dust is discharged from the hot air outlet 16, enters the dust remover 21 for dust removal under the action of the induced draft fan 22, is desulfurized by the desulfurization device 23, and enters the atmosphere after being discharged after reaching the standard.

4) Sealing the feeding system 30: the materials up to standard in drying freely switch into the second storage tank 31 to store for later use through the second valve 26 under the effect of the conveying device according to the demand, the third valve 27 capable of being freely switched is opened for later use, the feeding cylinder 33 is fed from the fourth valve 28 through the second screw device 32, the feeding cylinder 33 and the reaction kettle 37 rotating in a bedroom are connected with the dynamic and static sealing device 36 through the metal compensator 35, high-temperature dust-containing gas in the reaction kettle 37 goes out through the feeding cylinder 33 to enter the dust removal device 34 for dust removal, and the high-temperature oil gas after dust removal enters the next link.

The above description is only exemplary of the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the present invention.

Claims (10)

1. A coal drying, dedusting and feeding system heated by flue gas, which is characterized by comprising a conveying and storing system (1), a drying system (10), a dedusting and desulfurizing system (20) and a sealed feeding system (30),

the conveying and storing system (1) comprises a first conveying device (2) for conveying raw coal, the first conveying device (2) is connected with a first storage tank (3), the outlet end of the first storage tank (3) is connected with a second conveying device (5), and the second conveying device (5) is connected with a drying system;

the drying system (10) comprises a roller (11) with a driving device (14), wherein a feeding seal box (18) is arranged at the inlet end of the roller (11), and a discharging seal box (19) is arranged at the outlet end of the roller (11); the roller (11) is at least one stage;

the dust removal and desulfurization system (20) comprises a dust remover (21), an induced draft fan (22) and a desulfurization device (23) which are sequentially connected, wherein the dust remover is communicated with a hot air outlet end of the drying system (10);

sealed feed system (30) include second holding vessel (31), second screw means (32), feed barrel (33) and reation kettle (37) are connected gradually in second holding vessel (31), feed barrel (33) on set up ash handling equipment (34), feed barrel (33) in helical blade cross section be not more than the 3/4 of barrel internal cross section.

2. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the feeding seal box (18) comprises a feeding port (12) and a hot air inlet (13), the feeding port (12) is arranged at the top or the upper side of the feeding seal box (18); the discharging sealing box (19) comprises a discharging port (15) and a hot air outlet (16), and the discharging port (15) is arranged at the bottom end or the lower part of the side face of the discharging sealing box (19).

3. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the inner wall of the drum (11) is provided with L-shaped lifting blades (17), and the L-shaped lifting blades (17) are circumferentially distributed along the inner wall of the drum.

4. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the drum (11) comprises a plurality of stages, sequentially connected in series, connected in parallel, or a combination thereof.

5. The coal drying, dedusting and feeding system as set forth in claim 1, wherein the drum (11) comprises a horizontal arrangement or an inclined arrangement.

6. The coal drying, dedusting and feeding system as set forth in claim 1, wherein said second screw means (32) is of a shaftless screw or a shafted screw configuration.

7. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the material between the drums (11) is conveyed by a third conveyor (25).

8. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the discharging seal box (19) and the feeding seal box (18) are respectively provided with an access opening (24); and a heat-insulating layer is arranged outside the roller (11).

9. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the feeding cylinder (33) and the reaction kettle (37) are connected with a dynamic and static sealing device (36) through a metal compensator (35).

10. The coal drying, dedusting and feeding system as set forth in claim 1, characterized in that the second valve (26) and the third valve (27) are respectively installed at the feeding port and the discharging port of the second storage tank (31); and a fourth valve (28) is arranged at the feed inlet of the feed cylinder (33).

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