CN110396449A - A production device and method for efficient dehydration and calorific value improvement of raw coal - Google Patents

Abstract

A production device and method for high-efficiency dehydration and calorific value improvement of raw coal. The production device includes a raw coal storage bin, a raw coal conveyor, a spiral reactor, a clean coal conveyor, and a clean coal storage bin connected in sequence; the spiral reaction The reactor includes a motor, a reducer, and a reactor body. The reactor body is divided into a self-heating section, a low-temperature section, a high-temperature section and a cooling section from the feed end to the discharge end. There is a screw shaft in the reactor body. The motor The speed reducer is connected to the screw shaft; the gas generated by the reaction of the spiral reactor is condensed by the condenser of the self-heating section, the low-temperature section and the high-temperature section respectively, and the condensate is sent to the condensate of the self-heating section, the low-temperature section and the high-temperature section respectively It is stored in the tank for use; the low-temperature section and the high-temperature section are also equipped with a heating system, and the cooling section is equipped with a cooling system. The invention has compact structure, small footprint, continuous high efficiency, energy saving and environmental protection, can effectively dehydrate and improve the quality of low calorific value coal, has high dehydration efficiency, and can effectively increase the calorific value of coal at the same time.

Description

A production device and method for efficient dehydration and calorific value improvement of raw coal

technical field

The invention relates to the technical field of raw coal quality upgrading and processing, in particular to a production device and method for efficient dehydration and calorific value improvement of raw coal.

technical background

Coal is my country's basic energy source. In terms of coal types, my country has a complete range of coal, ranging from low-deteriorated lignite to high-deteriorated anthracite. Among them, bituminous coal accounts for up to 75%, and lignite and anthracite account for approximately 12% and 13%, although my country is rich in coal resources, especially with continuous mining, high-quality coal (anthracite) is gradually in short supply, while low-rank coal (lignite) is rich in resources, and it is expected to be developed and utilized.

Low-rank coal, such as lignite, is a brown-black low-rank coal with a low degree of metamorphism between peat and bituminous coal. It is a coal with high volatile content and internal moisture. It is easy to muddy when exposed to water. Therefore, it is necessary to improve the quality of lignite, reduce the moisture content and oxygen content, increase its calorific value, and solve the problems of serious environmental pollution and low heat utilization rate when low-rank coal is directly burned, so as to improve the quality and comprehensive utilization value of lignite and expand Its application fields are better applied to my country's chemical production, electric power industry and metallurgical industry.

The upgrading of low calorific value coal mainly refers to reducing impurities such as moisture and ash in coal and increasing the calorific value of coal. Dehydration and upgrading of low calorific value coal can reduce the long-distance transportation cost of coal on the one hand, and on the other hand, from the perspective of combustion, the dehydrated and upgraded lignite has higher flame temperature and thermal efficiency.

At present, indirect steam drying or flue gas drying are mostly used for dehydration and upgrading of low calorific value coal. Due to the high activity of the treated lignite, it is very easy to spontaneously ignite during storage and transportation. There is also a potential safety hazard of explosion in the flue gas drying process.

The mechanical thermal extrusion (MTE) technology researched by the Australian Lignite Research Center is still in the laboratory development stage, and can only reduce the moisture from 65% to 20-30%. The lignite hot-press drying technology developed by Pacific Rim Co., Ltd. is currently in the small-scale test stage of 5 tons/hour. The heavy oil coal slurry drying technology developed by Japan's NEDO for Indonesian lignite is also in the pilot stage.

Some domestic enterprises and scientific research departments have also carried out a lot of research and development on low calorific value coal drying and upgrading technologies. There are many ways to reduce coal moisture, for example: according to the movement mode of coal, there are fluidized bed, moving bed and entrained bed, etc. According to the heating method, there are internal heat type and external heat type, and according to the heat source, there are steam method and flue gas method.

The above-mentioned low calorific value coal dehydration processes at home and abroad all have the disadvantages of high energy consumption, high cost, poor effect, poor safety, and unstable operation.

Reference document: CN109576032A discloses a method of coal dehydration, upgrading and mixed steaming, which is to put the coal to be dehydrated into a closed pressure vessel, and make the moisture in the coal in the form of flash steam through mixed steaming and flash steaming. Volatilize out, thereby reducing the water content in the coal and increasing the calorific value of the coal. The process of dehydration and upgrading requires saturated steam with higher temperature and pressure, which has higher energy consumption, and the state of mixed steam and flash evaporation requires more precise pressure control, and the operation process is more complicated.

Contents of the invention

The technical problem to be solved by the present invention is to provide a production device and method for efficient dehydration of raw coal and improvement of calorific value. The reactor of the production device adopts a spiral reactor, and the reactor is divided into a self-heating section, a low-temperature section, a The high-temperature section dehydrates and upgrades the raw coal, and at the same time stirs the material through the screw shaft and pushes the material forward, which can realize continuous and efficient dehydration and upgrading of low-calorific-value coal, with high dehydration efficiency, and can effectively increase the calorific value of coal, and the present invention The production device has compact structure, small size, energy saving and environmental protection, the whole production process does not need to consume process water, and does not discharge waste gas, waste liquid and waste residue.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

Provide a production device for efficient dehydration of raw coal and improvement of calorific value, including:

Raw coal storage bins, raw coal conveyors, spiral reactors, clean coal conveyors and clean coal storage bins connected in sequence;

The spiral reactor includes a motor, a reducer, and a reactor body. The reactor body is sequentially divided into a self-heating section, a low-temperature section, a high-temperature section, and a cooling section from the feed end to the discharge end. The reactor body is provided with a screw shaft. , the motor and the reducer are connected to the screw shaft;

The spiral reactor also includes: a self-heating section steam collecting tank arranged on the top of the self-heating section of the reactor body, the self-heating section steam collecting tank is communicated with a self-heating section condenser, and the condensation of the self-heating section condenser The liquid outlet is connected to the condensate tank of the self-heating section; the low-temperature section heating system arranged at the bottom of the low-temperature section of the reactor body and the low-temperature section steam collection tank at the top of the low-temperature section are connected to a low-temperature section condenser, and the low-temperature section steam collection tank is connected to a low-temperature section condenser. The condensate outlet of the section condenser is connected to the condensate tank of the low temperature section; the heating system of the high temperature section arranged at the bottom of the high temperature section of the reactor body and the steam collecting tank of the high temperature section at the top of the high temperature section, the steam collecting tank of the high temperature section is condensed with a high temperature section The condensate outlet of the high-temperature section condenser is connected to the high-temperature section condensate tank; and the cooling section cooling system corresponding to the cooling section;

The feed end of the reactor body is provided with a feed port, and its discharge end is provided with a discharge port, the feed port is connected to the raw coal storage bin through the raw coal conveyor, and the discharge port is connected to the clean coal conveyor through the clean coal conveyor. silo.

further,

The feed end of the reactor body is also provided with at least one formulation inlet, and each formulation inlet is connected to a corresponding formulation tank through a corresponding formulation pump.

further,

The self-heating section condenser, the low-temperature section condenser, and the high-temperature section condenser all include a shell, a tube bundle, a tube sheet, and a head; the tube sheet and the tube bundle are all arranged in the shell, and the tubes The plate is arranged at the upper end of the tube bundle, and the head is arranged at the bottom of the shell.

further,

The raw coal conveyor is a raw coal screw conveyor; the clean coal conveyor is a clean coal screw conveyor.

The selection of screw conveyor can realize the complete sealing of the whole production device without dust.

further,

Blades are arranged on the screw shaft, and the blades are equidistantly arranged.

The present invention also provides a method for efficiently dehydrating raw coal and increasing its calorific value by using the above-mentioned production device, including the following steps:

S1. Feed material: Raw coal is sent into the reactor body from the feed port of the feed end of the reactor body through the raw coal conveyor. At the same time, the preparation is put into the preparation inlet according to the actual situation, and the preparation stored in the preparation tank is pumped in through the preparation pump. Inside the reactor body;

S2. Raw coal dehydration and quality improvement: while feeding the material, the motor drives the screw shaft to rotate, and while stirring the material, it pushes the feed to the discharge end. Dehydration and reaction under the heating of the heating system and the heating system in the high-temperature section, and the materials after the reaction are pushed to the cooling section for cooling;

S3. Steam condensation recovery:

While dehydrating and reacting in the self-heating section, low-temperature section, and high-temperature section of the reactor body, steam will be generated, and the steam generated in each section will be collected through the steam collection tank of the self-heating section, the low-temperature section and the high-temperature section. Then condense through the self-heating section condenser, the low-temperature section condenser, and the high-temperature section condenser respectively, and the condensate is sent to the self-heating section condenser, the low-temperature section condensate tank, and the high-temperature section condensate tank for storage;

S4. Clean coal storage

The clean coal obtained after being cooled by the cooling section in step S2 is sent to the clean coal storage bin through the clean coal conveyor through the discharge port at the discharge end of the reactor body.

further,

The temperature of the heating system in the low temperature section is from room temperature to 100°C;

The temperature of the heating system in the high temperature section is 100°C to 400°C;

The temperature of the cooling system in the cooling section is not higher than 50°C.

further,

The spiral reactor, the self-heating section condenser, the self-heating section condensation tank, the low-temperature section condenser, the low-temperature section condensate tank, the high-temperature section condenser, the high-temperature section condensate The pressure in the tank is not higher than 0.6MPa.

further,

The raw coal conveyor is a raw coal screw conveyor; the clean coal conveyor is a clean coal screw conveyor. The selection of screw conveyor can realize the complete sealing of the whole production device without dust.

further,

Blades are arranged on the screw shaft, and the blades are equidistantly arranged.

Beneficial effects of the present invention:

1. The production device for high-efficiency dehydration of raw coal and improvement of calorific value provided by the present invention has a compact structure and small volume; it can continuously and efficiently dehydrate and upgrade raw coal with low calorific value, and has high dehydration efficiency, and the dehydration rate can reach more than 90%. The highest can reach 99%; at the same time, it can also greatly increase the calorific value of raw coal, the calorific value can be increased by more than 1000kcal/kg, and the highest can reach 4000kcal/kg; and the entire production process does not need to consume process water, and does not emit waste gas, waste Liquid and waste residue, the whole production process is energy-saving and environmentally friendly.

2. The reactor of the production device of the present invention adopts a spiral reactor. By dividing the reactor into a self-heating section, a low-temperature section, and a high-temperature section, the raw coal is dehydrated and upgraded in stages, and at the same time, it is stirred by the screw shaft and the material is pushed forward. It can achieve continuous and efficient dehydration and upgrading of low calorific value coal, with high dehydration efficiency, and at the same time can effectively increase the calorific value of coal, and has good safety and stable operation. Moreover, condensates with different chemical compositions can be obtained through staged condensation. The condensate is mainly organic small molecule raw materials, such as aromatics, olefins, and alkanes.

3. The present invention can realize efficient dehydration of coal and increase of calorific value, can effectively reduce transportation cost and production cost of coal production enterprises and coal consuming enterprises, and has great social and economic benefits.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of a production device for efficient dehydration of raw coal and improvement of calorific value according to an embodiment of the present invention;

Fig. 2 is the structural representation of the spiral reactor of the embodiment of the present invention;

Fig. 3 is a structural schematic diagram of a condenser according to an embodiment of the present invention.

Description of the accompanying drawings of the present invention:

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1 to 3: the embodiment of the present invention provides a production device for high-efficiency dehydration of raw coal and improvement of calorific value, including raw coal storage bin 101, raw coal screw conveyor 102, screw reactor 201, Clean coal screw conveyor 601 and clean coal storage bin 701;

The spiral reactor 201 includes a motor 201-1, a reducer 201-2, and a reactor body. The reactor body is divided into a self-heating section 201-10, a low-temperature section 201-11, and a high-temperature section 201 from the feed end to the discharge end. -12 and the cooling section 201-06, the reactor body is provided with a screw shaft, and the motor 201-1 and the reducer 201-2 are connected to the screw shaft;

The spiral reactor 201 also includes: a self-heating section steam collecting tank 201-03 arranged on the top of the reactor body self-heating section 201-10, the self-heating section steam collecting tank 201-03 communicates with a self-heating section condenser 301, The condensate outlet of the self-heating section condenser 301 is connected to the self-heating section condensate tank 302; the low-temperature section heating system 201-7 at the bottom of the low-temperature section 201-11 of the reactor body and the low-temperature section steam collection at the top of the low-temperature section 201-11 Slot 201-4, the steam collecting tank 201-4 in the low temperature section communicates with a condenser 401 in the low temperature section, and the condensate outlet of the condenser 401 in the low temperature section is connected to the condensate tank 402 in the low temperature section; it is arranged at the bottom of the high temperature section 201-12 of the reactor body The high-temperature section heating system 201-8 and the high-temperature section steam collection tank 201-5 at the top of the high-temperature section 201-12, the high-temperature section steam collection tank 201-5 communicates with a high-temperature section condenser 501, and the condensate of the high-temperature section condenser 501 The outlet is connected to the high temperature section condensate tank 502; and, the cooling section cooling system 201-9 corresponding to the cooling section 201-6;

The feed end of the reactor body is provided with a feed port, and its discharge end is provided with a discharge port. The feed port is connected to the raw coal storage bin 101 through a raw coal screw conveyor 102, and the discharge port is connected to the raw coal storage bin 101 through a clean coal screw conveyor. 601 is connected to clean coal storage bin 701.

As a preferred embodiment, in order to improve dehydration efficiency and calorific value enhancement efficiency, chemical preparations can be added during the production process, so it is necessary to set a preparation inlet at the feed end of the reactor body, and at least one preparation inlet should be provided according to the actual situation. Depending on the number of chemical preparations that need to be added, each preparation inlet is connected to the corresponding preparation tank through a corresponding preparation pump. In this embodiment, two preparation inlets are set, specifically the first preparation inlet and the second preparation inlet. The first preparation inlet is connected to the first preparation tank 103 through the first preparation pump 104, and the second preparation inlet is connected through the second preparation pump 106. Connect with the second preparation tank 105.

In this embodiment, the self-heating section condenser 301, the low-temperature section condenser 401, and the high-temperature section condenser 501 adopt the same structure of condensers, specifically including a shell 301-1, a tube bundle 301-3, a tube plate 301-2 and a seal The head 301-4; the tube plate 301-2 and the tube bundle 201-3 are all set in the casing 301-1, and the tube plate 301-2 is set on the upper end of the tube bundle 301-3, and the head 301-4 is set in the shell 301 -1 bottom.

As a preferred embodiment, blades are provided on the screw shaft in this embodiment, and the blades are equidistantly arranged.

The method for efficient dehydration and calorific value improvement of raw coal by the production device provided in this embodiment is as follows

S1. Feed material: Raw coal is sent into the reactor body from the feed port at the feed end of the reactor body through the raw coal screw conveyor 102. At the same time, according to the actual situation, the preparations are respectively fed from the first preparation inlet and the second preparation inlet, and stored in The preparations in the first preparation tank and the second preparation tank are respectively pumped into the reactor body through the first preparation pump and the second preparation pump;

S2. Raw coal dehydration and quality improvement: while feeding, the motor 201-1 drives the screw shaft to rotate, and while stirring the materials, pushes the feed to the discharge end, and the feed passes through the self-heating section 201-10 and the low-temperature section 201-11 in sequence , high-temperature section 201-12, dehydration and reaction under the heating of the low-temperature section heating system 201-7 and the high-temperature section heating system 201-8 in turn, and the materials after the reaction are pushed to the cooling section 201-6 for cooling;

S3. Steam condensation recovery:

While dehydrating and reacting in the self-heating section 201-10, low-temperature section 201-11, and high-temperature section 201-12 of the reactor body, steam will be generated. The section steam collecting tank 201-4 and the high temperature section steam collecting tank 201-5 are collected, and then condensed through the self-heating section condenser 301, the low-temperature section condenser 401, and the high-temperature section condenser 501 respectively, and the condensate is sent to the self-heating section respectively Store in the condenser 302, the low-temperature section condensate tank 402, and the high-temperature section condensate tank 502;

S4. Clean coal storage

The clean coal obtained from step S2 after being cooled by the cooling section 201-6 is sent to the clean coal storage bin 701 through the clean coal screw conveyor 601 through the discharge port of the discharge end of the reactor body.

During the dehydration and upgrading process in step S2, the temperature of the heating system 201-7 in the low temperature section is controlled at room temperature to 100°C; the temperature of the heating system 201-8 in the high temperature section is controlled at 100°C to 400°C; the cooling system 201-9 in the cooling section The temperature is controlled at not higher than 50°C.

Simultaneously the pressure in the spiral reactor 201, the self-heating section condenser 301, the self-heating section condensation tank 302, the low-temperature section condenser 401, the low-temperature section condensate tank 402, the high-temperature section condenser 501, and the high-temperature section condensate tank 502 is all constant. higher than 0.6MPa.

The above production devices were applied to the dehydration and upgrading process of Lijiahao Medium Coal, Inner Mongolia Coal Slime, Shaanxi Coal, and Ximeng Raw Coal, and the changes in water content and calorific value before and after dehydration and upgrading were compared. The test results are shown in Table 1 ,2:

Table 1 Comparison of water content and calorific value changes before and after dehydration and upgrading (1)

Table 2 Comparison of water content and calorific value changes before and after dehydration and upgrading (2)

It can be seen from the data in the above Table 1 and Table 2 that: the production device provided in this embodiment is used to dehydrate and upgrade the raw coal, the dehydration rate of the raw coal can be as high as 90%, some as high as 99%; the increase in calorific value is greater than 1000kcal/kg, Some are as high as 2200kcal/kg or more, and the highest can be as high as 4000kcal/kg. Therefore, it can effectively reduce the transportation cost and production cost of coal production enterprises and coal consuming enterprises, and has great social and economic benefits.

Moreover, the production device for high-efficiency dehydration of raw coal and improvement of calorific value provided by the present invention has a compact structure and a small volume; and the entire production process does not need to consume process water, does not discharge waste gas, waste liquid, and waste residue, and the entire production process is energy-saving and environmentally friendly. The reactor of the production device of the present invention adopts a spiral reactor. By dividing the reactor into a self-heating section, a low-temperature section, and a high-temperature section, the raw coal is dehydrated and upgraded in stages, and at the same time, it is stirred by the spiral shaft and the material is pushed forward, which can realize Continuously and efficiently dehydrate and upgrade low calorific value coal, with high dehydration efficiency, and can effectively increase the calorific value of coal, with good safety and stable operation. Moreover, condensates with different chemical compositions can be obtained through staged condensation. The condensate is mainly organic small molecule raw materials, such as aromatics, olefins, and alkanes.

Finally, it should be noted that: the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention range.

Claims (10)

1. A production device for high-efficiency dehydration and calorific value promotion of raw coal, characterized in that it comprises: Raw coal storage bins, raw coal conveyors, spiral reactors, clean coal conveyors and clean coal storage bins connected in sequence; The spiral reactor includes a motor, a reducer, and a reactor body. The reactor body is sequentially divided into a self-heating section, a low-temperature section, a high-temperature section, and a cooling section from the feed end to the discharge end. The reactor body is provided with a screw shaft. , the motor and the reducer are connected to the screw shaft; The spiral reactor also includes: a self-heating section steam collecting tank arranged on the top of the self-heating section of the reactor body, the self-heating section steam collecting tank is communicated with a self-heating section condenser, and the condensation of the self-heating section condenser The liquid outlet is connected to the condensate tank of the self-heating section; the low-temperature section heating system arranged at the bottom of the low-temperature section of the reactor body and the low-temperature section steam collection tank at the top of the low-temperature section are connected to a low-temperature section condenser, and the low-temperature section steam collection tank is connected to a low-temperature section condenser. The condensate outlet of the section condenser is connected to the condensate tank of the low temperature section; the heating system of the high temperature section arranged at the bottom of the high temperature section of the reactor body and the steam collecting tank of the high temperature section at the top of the high temperature section, the steam collecting tank of the high temperature section is condensed with a high temperature section The condensate outlet of the high-temperature section condenser is connected to the high-temperature section condensate tank; and the cooling section cooling system corresponding to the cooling section; The feed end of the reactor body is provided with a feed port, and its discharge end is provided with a discharge port, the feed port is connected to the raw coal storage bin through the raw coal conveyor, and the discharge port is connected to the clean coal conveyor through the clean coal conveyor. silo. 2. The production device for high-efficiency dehydration and calorific value promotion of raw coal according to claim 1, characterized in that, The feed end of the reactor body is also provided with at least one formulation inlet, and each formulation inlet is connected to a corresponding formulation tank through a corresponding formulation pump. 3. The production device for efficient dehydration of raw coal and improvement of calorific value according to claim 1 or 2, characterized in that, The self-heating section condenser, the low-temperature section condenser, and the high-temperature section condenser all include a shell, a tube bundle, a tube sheet, and a head; the tube sheet and the tube bundle are all arranged in the shell, and the tubes The plate is arranged at the upper end of the tube bundle, and the head is arranged at the bottom of the shell. 4. The production device for efficient dehydration of raw coal and improvement of calorific value according to claim 1 or 2, characterized in that, The raw coal conveyor is a raw coal screw conveyor; the clean coal conveyor is a clean coal screw conveyor. 5. The production device for efficient dehydration of raw coal and improvement of calorific value according to claim 1 or 2, characterized in that, Blades are arranged on the screw shaft, and the blades are equidistantly arranged. 6. The method for efficient dehydration and calorific value promotion of raw coal by using the production device as claimed in claim 1 or 2, is characterized in that, comprising the steps of: S1. Feed material: Raw coal is sent into the reactor body from the feed port of the feed end of the reactor body through the raw coal conveyor. At the same time, the preparation is put into the preparation inlet according to the actual situation, and the preparation stored in the preparation tank is pumped in through the preparation pump. Inside the reactor body; S2. Raw coal dehydration and quality improvement: while feeding the material, the motor drives the screw shaft to rotate, and while stirring the material, it pushes the feed to the discharge end. Dehydration and reaction under the heating of the heating system and the heating system in the high-temperature section, and the materials after the reaction are pushed to the cooling section for cooling; S3. Steam condensation recovery: Steam will be generated during dehydration and reaction in the self-heating section, low-temperature section, and high-temperature section of the reactor body, and the steam generated in each section will be collected through the steam collection tank of the self-heating section, the low-temperature section and the high-temperature section, and then Each is condensed through the self-heating section condenser, the low-temperature section condenser, and the high-temperature section condenser, and the condensate is sent to the self-heating section condenser, the low-temperature section condensate tank, and the high-temperature section condensate tank for storage; S4. Clean coal storage The clean coal obtained after being cooled by the cooling section in step S2 is sent to the clean coal storage bin through the clean coal conveyor through the discharge port at the discharge end of the reactor body. 7. The method for highly efficient dehydration and calorific value promotion of raw coal according to claim 6, characterized in that, The temperature of the heating system in the low temperature section is from room temperature to 100°C; The temperature of the heating system in the high temperature section is 100°C to 400°C; The temperature of the cooling system in the cooling section is not higher than 50°C. 8. The method for efficient dehydration of raw coal and improvement of calorific value according to claim 6 or 7, characterized in that, The spiral reactor, the self-heating section condenser, the self-heating section condensation tank, the low-temperature section condenser, the low-temperature section condensate tank, the high-temperature section condenser, the high-temperature section condensate The pressure in the tank is not higher than 0.6MPa. 9. The method for highly efficient dehydration and calorific value promotion of raw coal according to claim 6, characterized in that, The raw coal conveyor is a raw coal screw conveyor; the clean coal conveyor is a clean coal screw conveyor. 10. The method for efficient dehydration of raw coal and improvement of calorific value according to claim 6, characterized in that, Blades are arranged on the screw shaft, and the blades are equidistantly arranged.