CN106369937A - Coal slime drying system and drying technique thereof - Google Patents

Abstract

The present invention provides a coal slime drying system and a drying process, wherein the coal slime drying system includes a coal slime crusher, a drying and dispersing machine and a coal powder collection device, and the inlet end of the coal slime crusher is used for To receive wet coal slime, the outlet end of the slime crusher is connected to the inlet end of the drying and dispersing machine; an air inlet is provided on the drying and dispersing machine, and the outlet end of the drying and dispersing machine is connected to the The pulverized coal collection device is connected.

Description

A kind of coal slime drying system and its drying process

technical field

The invention relates to the technical field of wet coal slime drying, in particular to a coal slime drying system and a drying process thereof.

Background technique

Coal slime is a by-product produced in the process of coal washing in coal preparation plants. It has the characteristics of high moisture content, high viscosity, high water holding capacity and low calorific value, so it is difficult to realize industrial application and has been rejected by power users for a long time. Except for a small part that is used for civilian use, most of the rest are used for combustion in coal slime boilers to generate electricity, or piled up as waste.

At present, when using the above-mentioned coal slime, the power plant adopts the mixed combustion method, that is, the coal slime and coal powder are mixed and burned, but due to the high water content, poor fluidity and low calorific value of the coal slime, it often brings operational difficulties to the operation of the boiler. Reduce boiler combustion efficiency. Therefore, in order to prevent the coal slime from bringing too much water into the boiler, it is necessary to dry the coal slime first. The diameter is uniform, and the calorific value can also be greatly improved.

Domestic coal slime drying technology is mainly divided into high-temperature flue gas drying technology and low-temperature steam drying technology, of which:

(1) The high-temperature flue gas drying technology uses high-temperature flue gas to dry the coal slime in the rotary cylinder dryer. The system structure of the high-temperature flue gas drying technology is mainly composed of heat source equipment, breaking silos, belt feeders, and screw conveyors. Conveyor, rotary cylinder dryer, transmission mechanism, unloader, induced draft fan, dust removal equipment and electric control system, but the high-temperature flue gas drying technology has high energy consumption, waste of resources, and serious environmental pollution, and The temperature of the high-temperature hot air reaches 500-700°C, so there is a risk of explosion if improperly operated.

(2) The low-temperature steam drying technology is an energy-saving and environmentally-friendly technology that uses the latent heat of vaporization of the waste heat steam of the power plant to heat and dry the coal slime. The evaporated water of the coal slime can be recycled through the heat exchange equipment. The drying system using low-temperature steam drying technology is mainly composed of breaking silo, belt feeder, screw conveyor, steam drying equipment, transmission mechanism, unloader, induced draft fan, dust removal equipment and electric control system. However, although the low-temperature drying technology solves the problem of wasting resources, its equipment is bulky, heavy, and occupies a large area, so the investment cost of the plant and infrastructure is high. In addition, the low-temperature drying technology equipment has complex processes and limited low-temperature steam sources, etc. Therefore, it cannot be used on a large scale.

Contents of the invention

In order to overcome the defects of the prior art, the object of the present invention is to provide a coal slime drying system and its drying process, so as to thoroughly dry and pulverize the coal slime to meet the requirements of industrial use.

An embodiment of the present invention provides a coal slime drying system, including: a coal slime crusher, a drying and dispersing machine, and a pulverized coal collection device, wherein:

The inlet end of the coal slime crusher is used to receive wet coal slime, and the outlet end of the coal slime crusher is connected to the inlet end of the drying and breaking machine; an air inlet is provided on the drying and breaking machine, The outlet end of the drying and dispersing machine is connected with the pulverized coal collection equipment.

Preferably, the system also includes a material separator, wherein:

The inlet end of the material separator is connected to the outlet end of the drying and dispersing machine, the first outlet end of the material separator is connected to the inlet end of the drying and dispersing machine, and the material separator The second outlet port is connected with the pulverized coal collection equipment.

Preferably, the pulverized coal collection equipment includes a cyclone separator and a bag filter, wherein:

The inlet end of the cyclone separator is connected to the outlet end of the material separator, and the outlet end of the cyclone separator is connected to the inlet end of the bag filter.

Preferably, the system also includes an induced draft fan, wherein:

The induced draft fan is connected with the outlet end of the bag filter.

Preferably, the system also includes a coal slime buffer bin and a screw feeder, wherein:

The outlet of the coal slime buffer bin is connected to the inlet end of the screw feeder, and the outlet end of the screw feeder is connected to the inlet end of the coal slime crusher.

Preferably, the system further comprises: a plate heat exchanger, wherein:

The plate heat exchanger exchanges the normal-temperature air with the heat of the hot waste water/hot steam, converts the normal-temperature air into low-temperature air, and then transports it to the drying and dispersing machine.

Preferably, the drying and dispersing machine includes: an unloading valve, the discharge end of the unloading valve is connected to the feed pipe, and the feed pipe is connected to the dry air inlet pipe to form an integral body. The outlet ends of the material pipe and the dry air inlet pipe are connected to the crushing chamber, and a rotating and breaking mechanism for quickly crushing the slime is installed inside the crushing chamber, and a saturated air outlet pipe is also connected to the crushing chamber , the discharge pipe is set at the middle section of the saturated air outlet pipe, and at the junction of the crushing chamber and the saturated air outlet pipe, a classification device to prevent large particles of crushed materials from flowing out of the discharge pipe is also installed in the crushing chamber.

Preferably, the grading device is composed of a plurality of rows of retaining rods arranged in the horizontal direction, and the retaining rods are arranged at intervals.

Preferably, the rotating breaking mechanism is a rotor hammer, and the rotor hammer is controlled by a main motor to rotate.

Preferably, an observation hole is also provided on the side wall of the feed pipe.

Preferably, the dry air inlet pipe is also connected to heat exchange and dehumidification equipment.

The embodiment of the present invention also provides a process for drying coal slime using any of the aforementioned coal slime drying systems, characterized in that: the process includes:

S1. Pre-crushing the wet coal slime into the coal slime crusher;

S2. The pre-crushed wet coal slime is sent to the drying and dispersing machine for drying and dispersing to form coal powder particles;

S3. The pulverized coal particles are sent to the pulverized coal collection equipment for pulverized coal recovery.

Preferably, the pulverized coal particles are sent to pulverized coal collection equipment for separation, including:

After the pulverized coal particles are sent into the material separator, the material separator sends the pulverized coal particles with a particle size greater than 0.5mm back to the drying and dispersing machine for drying and dispersing again; The pulverized coal particles are recycled through the separator and bag filter.

Preferably, the process also includes:

The waste gas in the pulverized coal collection equipment is discharged through the induced draft fan.

Preferably, the process also includes:

When the wet coal slime is pre-crushed in the coal slime crusher, dry coal powder is added; and/or

When the pre-crushed wet coal slime is sent to the drying and dispersing machine for drying and dispersing, it is mixed with dry coal powder.

The coal slime drying system and drying process thereof provided by the embodiments of the present invention have the following beneficial effects:

(1) The present invention changes the traditional coal slime drying process and must adopt the mode of heat source. The wet coal slime is pre-broken by the coal slime crusher and then enters the drying and dispersing machine to be crushed into coal slime particles. The surface moisture of the coal slime particles is crushed by drying The bulk machine is taken away by the normal temperature flowing air inhaled by negative pressure, and the qualified coal slime particles are sorted by the material separator into the cyclone separator and the bag filter for drying and recovery. The material separator is controlled by the frequency converter and the unqualified coal slime Flowing into the slime crusher and drying and dispersing machine cycle operation, which improves the efficiency of coal slime crushing and drying.

(2) The coal slime drying process system of the present invention has the advantage of low energy consumption, and its maximum hour processing coal slime reaches more than 100 tons, and the coal slime drying cost control is about 10 yuan/ton, and the coal slime after drying can be It is widely used in pulverized coal boiler power plants. It can not only be pressed into briquettes for use in lump coal boilers in various power plants, but also can be blended and sold with other coal products.

(3) A grading device is installed in the drying and dispersing machine. The grading device prevents the large-grained coal slime from flowing out of the discharge pipe due to the centrifugal impact force of the rotor hammer, ensuring that the large-grained coal slime continues to flow into the crushing chamber for crushing, so that the coal slime The moisture in the container is fully exposed and dispersed, which is conducive to the inflow of moisture into the air.

(4) The present invention also utilizes waste heat from power plants or steam conversion or low-temperature flue gas in the basis of normal temperature air drying, so that the temperature of normal temperature air is properly increased, so that the amount of water that can be accommodated in the air is improved, which is beneficial to the drying of the coal slime moisture by the air Quickly brought out, the process of wet coal slime from feeding to discharging in the present invention is less than 1min, which can reduce the moisture content of coal slime by more than 20% within 1min; the present invention can also directly use all power plant low-temperature flue gas or high-temperature steam, etc. The heat source used in the traditional coal slime drying process, and because of the higher dispersion efficiency, the heat exchange efficiency is higher, and the cost of coal slime drying is lower.

(5) Utilize the coal slime particle that the oven dry breaks up and breaks up in the present invention to be the dry powder of 0-0.5mm, and its moisture content is lower than 10%, can directly make briquette, more can carry out as coal blending The shape of the slime particles is uniform, and it can also be directly burned in the pulverized coal boiler of the power plant with high efficiency.

Description of drawings:

Figure 1 is a schematic diagram of the normal temperature coal slime drying process.

Fig. 2 is a system schematic diagram of a low-temperature coal slime drying process using low-temperature flue gas from a power plant.

Fig. 3 is a system schematic diagram of a low-temperature coal slime drying process using hot wastewater/hot steam from a power plant.

Figure 4 is a schematic diagram of the structure of the drying and dispersing machine.

Among them: 1. Low temperature coal slime; 2. Coal slime buffer bin; 3. Screw feeder; 4. Coal slime crusher; 5. Material separator; , observation hole; 603, feeding pipe; 604, rotor hammer; 605, dry air inlet pipe; 606, saturated air outlet pipe; 607, retaining rod; 608, main motor; 609, crushing cavity; 610, outlet Material pipe; 7. Cyclone separator; 8. Bag filter; 9. Coal powder particles; 10. Induced fan; 11. Plate heat exchanger.

detailed description:

In order to make the technical content disclosed in this application more detailed and complete, reference may be made to the drawings and the following various specific embodiments of the present invention, and the same symbols in the drawings represent the same or similar components. However, those skilled in the art should understand that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for schematic illustration and are not drawn according to their original scale.

The specific implementation manners of various aspects of the present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment one:

As shown in Figure 1, the coal slime drying system described in this embodiment includes a coal slime buffer bin 2, a screw feeder 3, a coal slime crusher 4, a material separator 5, a drying and disintegrating machine 6, and a cyclone separator. Device 7, bag dust collector 8 and induced draft fan 10, in Fig. 1, 1 represents wet coal slime (before drying), and 9 represents coal powder particle (formed coal powder particle after wet coal slime is dried).

Coal slime buffer bin 2 is used to receive and store wet coal slime 1, the outlet end of coal slime buffer bin 2 is connected to the inlet end of screw feeder 3, the outlet end of screw feeder 3 is connected to the inlet end of coal slime crusher 4 connection, wherein: the wet coal slime 1 in the coal slime buffer bin 2 is sent to the coal slime crusher 4 through the screw feeder 3, and in the coal slime crusher 4, the wet coal slime is pre-crushed to form coal slime particles. The size of the wet slime 1 entering the screw feeder 3 is generally less than 300mm, and after pre-crushing by the slime crusher 4, the size of the wet slime particles is generally less than 10mm. The screw feeder 3 can control the progress of the wet slime entering the slime crusher 4, according to the amount of wet slime in the slime crusher 4, it can choose to feed the wet slime into the slime crusher or suspend feeding the wet slime .

The outlet end of the coal slime crusher 4 is connected to the inlet end of the drying and breaking machine 6, and the drying and breaking machine 6 is also provided with an air inlet 61, and the outlet end of the drying and breaking machine 6 is connected to the material separator 5, Wherein: the normal temperature gas is continuously sent into the drying and dispersing machine 6 through the air inlet of the drying and dispersing machine, and the wet coal slime particles output by the coal slime crusher 4 enter the drying and dispersing machine 6, and are dried in the normal temperature gas Under the action, the wet coal slime particles are continuously dried, and are continuously dispersed into smaller coal powder particles during the continuous stirring process of the drying and dispersing machine 6, and the size of the dispersed coal powder particles is Roughly 0 to 0.5mm.

The outlet end of the drying and dispersing machine 6 is connected to the inlet end of the material separator 5, the first outlet end of the material separator 5 is connected to the inlet end of the drying and dispersing machine 6, and the material separator 5 is connected to the received The coal powder particles are separated. If the coal powder particles are larger than 0.5mm, the coal powder particles are sent back to the drying and dispersing machine 6 for drying and dispersing; if the coal powder particles are less than or equal to 0.5mm, the part of the coal powder particles The particles are transported to the cyclone separator 7 for subsequent separation process.

The inlet end of the cyclone separator 7 is connected to the second outlet end of the material separator 5, the outlet end of the cyclone separator 7 is connected to the inlet end of the bag filter 8, and the outlet end of the bag filter 8 is connected to the induced draft fan 10, wherein : The pulverized coal particles entering the cyclone separator 7, under the action of the cyclone separator 7, the bag filter 8 and the induced draft fan 10, the dried coal powder particles 9 are separated, and the waste gas is discharged into the atmosphere through the induced draft fan 10 middle. The separated pulverized coal particles 9 can meet the requirements of direct combustion, and belong to the pulverized coal that can be used directly. Exhaust exhaust air does not contain any pollution, so it can be discharged directly into the atmosphere.

In the embodiment of the present invention, the cyclone separator 7 and the bag filter 8 can be collectively referred to as coal powder collection equipment.

In the embodiment of the present invention, the induced draft fan 10 may also be a high-pressure induced draft fan.

As shown in Fig. 4, in the embodiment of the present invention, the drying and dispersing machine 6 includes: a discharge valve 601 with a function of uniform feed adjustment, the discharge end of the discharge valve 601 is connected to the feed pipe 603, The feed pipe 603 is connected with the dry air inlet pipe 605 to form a single body, and an observation hole 602 is provided on the side wall of the feed pipe 603 . The outlet ends of the feeding pipe 603 and the dry air inlet pipe 605 are connected with the crushing chamber 609, and a rotating breaking mechanism for quickly crushing the coal slime is set inside the crushing chamber 609. The rotating breaking mechanism is a rotor hammer 604 , the rotor hammer 604 is controlled by the main motor 608 to rotate, and the saturated air outlet pipe 606 is connected to the crushing chamber 609. At the connection of the air duct 606, a grading device is provided in the crushing chamber 609 to prevent large particles of pulverized materials from flowing out of the discharge pipe 610. The above-mentioned grading device is composed of multiple rows of stop rods 607 arranged in the horizontal direction. Each stop rod 607 spaced apart from each other.

The slime material enters the feed pipe 603 evenly through the discharge valve 601 and flows to the crushing chamber 609. Since the slime material is relatively viscous, the feed pipe 603 is made of smooth material to facilitate the inflow of the slime material. , to prevent the clogging of slime. The main motor 608 controls the high-speed operation of the rotor hammer 604 to crush the slime material into tiny particles, so that the water in the slime is fully exposed and dispersed, and the external dry air enters the crushing chamber from the dry air inlet pipe 605 under the action of negative pressure 609 and contact with the coal slime crushed into tiny particles, and use the dry air to bring the moisture on the surface of the coal slime to the air, so that the above-mentioned dry air in contact with the coal slime can be transformed into saturated humid air. When the coal slime material is crushed to a particle size that can be taken away by the updraft, it passes through the material blocking rod 607 and flows out from the discharge pipe 610 in the middle section of the saturated air outlet pipe 606 to enter the next-level equipment, but does not meet the particle size requirements. The large particle coal slime continues to fall into the crushing chamber 609 under the blocking of the material retaining rod 607 for pulverization until it is crushed into tiny particles that can pass through the material retaining rod 607 .

In the embodiment of the present invention, a scraping device may also be provided in the unloading valve to scrape the viscous slime into the unloading valve for subsequent treatment.

In the embodiment of the present invention, the coal slime crusher 4 can also be mixed with dry coal powder in the process of crushing the wet coal slime, so that the coal slime crusher 4 is in the process of crushing the wet coal slime. Stick dry coal powder, it is not easy to stick to each other, and improve the crushing effect. Wherein dry pulverized coal can be to directly input part of dry pulverized coal to coal slime crusher 4 at the output end of drying and disintegrating machine 6, also can directly add dry pulverized coal in coal slime crusher 4 from other channels.

In the embodiment of the present invention, when the drying and dispersing machine 6 is drying and dispersing the crushed wet coal slime, it can also mix other dry coal powders such as fine coal, mixed coal, lignite, etc., so that the drying and dispersing Dispersion effect is better.

In the embodiment of the present invention, before the normal-temperature air or low-temperature flue gas or low-temperature air from the power plant input by the dry air inlet pipe 605 enters the drying and dispersing machine 6, the normal-temperature air or low-temperature flue gas from the power plant can also be reduced by heat exchange and dehumidification equipment. The humidity in air or low-temperature air improves the drying and dispersing effect.

The coal slime drying system provided by the embodiment of the present invention can use air at normal temperature or low temperature air below 100°C for drying.

Embodiment two:

As shown in Figure 2, the embodiment of the present invention also provides a coal slime drying system, including a coal slime buffer bin 2, a screw feeder 3, a coal slime crusher 4, a material separator 5, and a drying and breaking up machine 6 , cyclone separator 7, bag filter 8 and induced draft fan 10, in Fig. 2, 1 represents the wet coal slime before drying, and 9 represents the coal slime (coal powder) after drying.

In this embodiment, what the air inlet of the drying and dispersing machine 6 introduces is the low-temperature flue gas of the power plant, and the drying and dispersing machine 6 uses the low-temperature flue gas to dry and disperse the wet coal slime, which improves the efficiency of drying and dispersing. scattered efficiency.

The connection relationship and function description of each component in the coal slime drying system provided by the embodiment of the present invention are the same as those in the first embodiment, and can refer to the description in the first embodiment, and will not be repeated here.

Embodiment three:

As shown in Figure 3, the embodiment of the present invention also provides a coal slime drying system, including a coal slime buffer bin 2, a screw feeder 3, a coal slime crusher 4, a material separator 5, and a drying and breaking up machine 6 , cyclone separator 7, bag filter 8 and induced draft fan 10, in Fig. 3, 1 represents the wet coal slime before drying, and 9 represents the coal slime (coal powder) after drying.

The coal slime drying system provided by the embodiment of the present invention also includes a plate heat exchanger 11, in which the normal temperature gas and the hot waste water/hot steam discharged from the power plant are input into the plate heat exchanger 11, and the hot waste water/hot steam is exchanged with the normal temperature air , the cold waste water produced is directly discharged, and the hot air (also called "low temperature air") produced enters the drying and breaking machine 6 through the air inlet of the drying and breaking machine 6 to dry the wet coal slime.

The connection relationship and functions of other components in the slime drying system provided by the embodiment of the present invention are consistent with those in the first embodiment, and reference can be made to the description in the first embodiment, which will not be repeated here.

Embodiment four:

The embodiment of the present invention also provides a coal slime drying process using the above coal slime drying system to dry the coal slime, including:

S1. The wet coal slime is transported to the coal slime buffer bin through the conveyor belt;

After the system is powered on, the wet coal slime is sent to the coal slime buffer bin through the conveyor belt. The wet coal slime can be the tailings product of the coal preparation plant. The shape is blocky, and its size is generally less than 300mm. Wet coal slime is generally formed by the mutual adsorption of a large number of pulverized coal particles with a size below 0.5 mm under the viscosity of the external water. The wet coal slime can be dehydrated by a disc filter to reduce the moisture content of the wet coal slime by 25-35%. Wet coal slime can be temporarily stored in the coal slime buffer bin, and then sent to the coal slime crusher.

S2. The wet coal slime is sent to the coal slime crusher through the coal slime buffer bin through the screw feeder, and the wet coal slime is pre-crushed;

The wet coal slime enters the screw feeder from the slime buffer bin first, and then is sent to the slime crusher by the screw feeder. The screw feeder can choose to feed the slime according to the amount of slime in the slime crusher. Speed up, stabilize or stop conveying wet slime. The wet slime can enter the screw feeder through the conveyor belt, or set the inlet end of the screw feeder below the outlet end of the slime buffer bin, so that opening the slime buffer bin will allow the wet slime to directly enter the screw feeder inside the plane. The wet coal slime in the screw feeder is fed into the slime crusher during the rotation process, and the inlet of the slime crusher can be set directly below the outlet of the screw feeder.

The coal slime crusher can pre-break the wet coal slime by using high-speed rotating hammers or rotating cages, so that the particle size of the pre-broken wet coal slime particles is less than 10mm, which is convenient for subsequent drying and breaking up by the dispersing machine. It can improve the efficiency of drying and dispersing.

S3. The pre-crushed wet coal slime is sent to the drying and dispersing machine for drying and dispersing;

After the pre-crushed wet coal slime is sent to the drying and dispersing machine, it is broken into coal slime particles in the drying and dispersing machine. The dispersed coal slime particles are mixed with normal temperature air or low-temperature flue gas or low-temperature air from the air inlet of the drying and dispersing machine through negative pressure suction, and the surface of the coal slime particles Moisture is taken out and dried into coal powder particles, wherein the particle size of coal powder particles is 0-0.5mm.

After the air at normal temperature or the low-temperature flue gas or low-temperature air of the power plant passes through the drying and dispersing machine, under the action of the induced draft fan, an airflow path is formed in the drying and dispersing machine, material separator, cyclone separator and bag filter, and the air is flowing During the process, the moisture on the surface of the wet coal slime particles can be taken away, so that the coal slime particles can be dried into coal powder particles. At the same time, the drying and dispersing machine is constantly stirring during the working process to accelerate the loss of water in the wet slime and improve the drying efficiency.

The pre-crushed wet coal slime can be sent to the drying and disintegrating machine through the transmission belt, or the inlet end of the drying and disintegrating machine is set below the outlet end of the coal slime crusher, and the crushed wet coal slime can be sent directly to the drying machine. Break into the machine.

S4: The pulverized coal particles after being dried and dispersed are sent to the material separator;

The pulverized coal particles that have been dried and dispersed can flow into the material separator, cyclone separator, and bag filter in sequence under the action of the updraft, in which:

After being dried and dispersed into the material stager, the pulverized coal particles can be sorted by the material separator, and the pulverized coal particles with a particle size less than or equal to 0.5mm are sequentially transported to the cyclone separator and bag filter to realize the separation of coal Recycling of powder particles; coal powder particles with a particle size greater than 0.5mm will be re-sent to the drying and dispersing machine for drying and dispersing again.

S5. Discharge the flowing gas in the cyclone separator and the bag filter through the induced draft fan.

The flowing gas can be air at normal temperature, low temperature air or low temperature flue gas from a power plant. For normal temperature air and low temperature air, it can be directly discharged into the atmosphere. For low temperature flue gas from a power plant, it needs to be transported to the exhaust pipe of the power plant for pollution treatment. re-emitted to the atmosphere.

It should be noted that: when the wet coal slime is pre-crushed in step S2, dry coal powder can be added, and the surface of the wet coal slime after pre-crushing is stuck with dry coal powder to prevent the wet coal slime after pre-crushing from sticking together again, affecting the Pre-crushing effect. In step S2, the added dry coal powder can be part of the coal powder particles output in step S4, or dry coal powder input through other channels.

In step S3, when drying and dispersing the pre-crushed wet coal slime, other dry coal powders such as fine coal, blended coal, lignite, etc. may be mixed to make the drying and dispersing effect better.

In step S3, before normal-temperature air or low-temperature flue gas from a power plant or low-temperature air enters the drying and dispersing machine, the humidity in the normal-temperature air or low-temperature flue gas or low-temperature air from a power plant can be reduced through heat exchange and dehumidification equipment to improve the drying and dispersing process. diffuse effect.

The coal slime drying system and its drying process provided in the embodiments of the present invention can be used not only to treat coal slime, but also to treat sludge, distiller's grains and substances with similar characteristics. Therefore, the coal slime involved in the embodiments of the present invention may also be sludge, distiller's grains and substances with similar properties.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, they can also make Changes or changes in other different forms, the exemplary embodiments of the present invention cannot exhaust all implementation modes, and all obvious changes or changes that are derived from the technical solutions of the present invention are still within the scope of protection of the present invention List. All documents mentioned in this application are incorporated by reference in this application as if an individual document were individually incorporated by reference.

Claims (16)

1. a kind of coal slime drying system it is characterised in that: described system includes: coal slime breaker (4), dry beater (6) and Coal powder collection equipment, wherein:

The entrance point of described coal slime breaker (4) is used for receiving wet coal slime, the port of export of described coal slime breaker (4) and described baking The entrance point of dry beater (6) connects；Air inlet offered on described drying beater (6), the going out of described drying beater (6) Mouth end is connected with described coal powder collection equipment.

2. as claimed in claim 1 a kind of coal slime drying system it is characterised in that: described system also includes material separator (5), wherein:

The entrance point of described material separator (5) is connected with the described port of export drying beater (6), described material separator (5) first outlet end is connected with the described entrance point drying beater (6), the second outlet end of described material separator (5) It is connected with described coal powder collection equipment.

3. as claimed in claim 12 a kind of coal slime drying system it is characterised in that described coal powder collection equipment includes whirlwind Separator (7) and sack cleaner (8), wherein:

The entrance point of described cyclone separator (7) is connected with the second outlet end of described material separator (5), described cyclonic separation The port of export of device (7) is connected with the entrance point of described sack cleaner (8).

4. as claimed in claim 3 a kind of coal slime drying system it is characterised in that described system also includes air-introduced machine (10), Wherein:

Described air-introduced machine (10) is connected with the port of export of described bag dust collector (8).

5. as claimed in claim 1 a kind of coal slime drying system it is characterised in that described system also includes coal slime surge bunker (2) and screw(-type) feeder (3), wherein:

The outlet of described coal slime surge bunker (2) is connected with the entrance point of described screw(-type) feeder (3), described screw(-type) feeder (3) The port of export be connected with the entrance point of described coal slime breaker (4).

6. coal slime drying system as claimed in claim 1 is it is characterised in that described system also includes: plate type heat exchanger (11), Wherein:

The heat of normal temperature air and thermal wastewater/vapourss is swapped by described plate type heat exchanger (11), and normal temperature air is changed Dry beater (6) for being delivered to after Cryogenic air.

7. described coal slime drying system as arbitrary in claim 1 to 6 it is characterised in that: described drying beater (6) include: Discharge valve (601), the discharge end of described discharge valve (601) is connected with feed pipe (603), and described feed pipe (603) is empty with dry Gas blast pipe (605) is connected to form one, the port of export of described feed pipe (603) and dry air blast pipe (605) all with broken Broken chamber (609) connection, is provided for breaing up mechanism to the rotation of coal slime fast-crushing, in institute inside described crusher chamber (609) State and saturated air discharge pipe (606) is also connected on crusher chamber (609), discharge nozzle (610) is opened in saturated air discharge pipe (606) Middle section, in described crusher chamber (609) and the junction of saturated air discharge pipe (606), also sets in described crusher chamber (609) Put the grading plant preventing bulky grain comminuting matter from flowing out discharge nozzle (610).

8. coal slime drying system as claimed in claim 7 it is characterised in that: described grading plant is arranged in the horizontal direction by multirow Backgauge rod (607) composition of row, arranged for interval each other between each backgauge rod (607).

9. coal slime drying system as claimed in claim 7 it is characterised in that: described rotation break up mechanism for rotor hammer into shape (604), Described rotor hammer (604) is rotated by mair motor (608) control.

10. coal slime drying system as claimed in claim 7 it is characterised in that: described rotation break up mechanism be rotating cage, described turn Cage is rotated by mair motor (608) control.

11. coal slime drying systems as claimed in claim 7 it is characterised in that: the side wall in described feed pipe (603) also sets up Observation port (602).

12. coal slime drying systems as claimed in claim 7 it is characterised in that: described dry air blast pipe (605) also with change Hot dehumidification equipment is connected.

A kind of 13. techniques coal slime being dried using described coal slime drying system as arbitrary in claim 1 to 12, it is special Levy and be: described technique includes:

S1, by wet coal slime send into coal slime breaker after carry out precrushing；

Wet coal slime after s2, precrushing is admitted in drying beater and carries out drying and break up, and forms pulverized coal particle；

S3, pulverized coal particle are admitted to coal powder collection equipment and carry out coal dust recovery.

14. coal slime drying processes as claimed in claim 13 it is characterised in that: described pulverized coal particle is admitted to coal powder collection and sets Standby carry out separating, comprising:

After described pulverized coal particle is admitted to material separator, the pulverized coal particle that particle diameter is more than 0.5mm is sent by described material separator Return and dry beater and re-start drying and break up；The pulverized coal particle that particle diameter is less than or equal to 0.5mm is removed by separator and cloth bag Dirt device carries out coal dust recovery.

15. coal slime drying processes as described in claim 13 or 14 it is characterised in that: described technique also includes:

By air-introduced machine, the waste gas in described coal powder collection equipment is discharged.

16. coal slime drying processes as described in claim 13 or 14 it is characterised in that: described technique also includes:

When described wet coal slime carries out precrushing in described coal slime breaker, mix dry pulverized coal；And/or

Wet coal slime after precrushing is admitted to when carrying out drying and break up in drying beater, is impregnated in dry pulverized coal.