WO2024230196A1 - Device for preparing composite coal-water slurry by mixing garbage leachate and pulverized coal - Google Patents

Abstract

The present invention relates to the technical field of garbage leachate treatment coupled with clean coal, in particular to a device for preparing composite coal-water slurry by mixing garbage leachate and pulverized coal. The device comprises a scraping assembly, which comprises a stirring barrel member and a scraping member configured to scrape an inner wall of the stirring barrel member; and a feeding assembly, which comprises an upper cover member positioned on the stirring barrel member, a support member fixed to the upper cover member and a feeding member fixed to the upper cover member. In the present invention, a stirring member is controlled to operate so as to make concentrated garbage leachate be stirred; the stirring member is also controlled to operate to make the scraping member operate so as to scrape the inner wall of the stirring barrel member, thereby preventing some reactants from adhering to the inner wall; and the stirring member is controlled to operate also to make the feeding member operate, so as to enable the pulverized coal and sodium lignosulfonate in the feeding member to gradually fall into the stirring barrel member a plurality of times, such that the garbage leachate, the pulverized coal and the sodium lignosulfonate are fully mixed.

Description

A device for preparing composite water-coal slurry by mixing landfill leachate and coal powder Technical Field

The invention relates to the technical field of landfill leachate disposal coupled with clean coal, and in particular to a device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder.

Background Art

Garbage leachate refers to wastewater that comes from the water contained in the garbage in the landfill itself, the rain and snow water that seeps from the surface, and passes through the garbage layer and soil layer. It contains a large amount of suspended matter and high concentrations of organic and inorganic components. The organic pollutants in the landfill leachate mainly include organic heterocyclics (heterocyclics, polycyclic aromatic hydrocarbons), acids, amides, etc., accounting for more than 70% of the total organic components of the landfill leachate; inorganic pollutants include a large number of inorganic salts, heavy metals, ammonia nitrogen memory chlorinated organic matter and other difficult-to-degrade pollutants. Landfill leachate has complex water quality components, large changes in water quality and water volume, severe odor, high concentration of difficult-to-degrade organic matter, high ammonia nitrogen content, high heavy metal content, low biodegradability, unbalanced nutrient element ratio, deep chromaticity, and if improperly handled, it is very easy to cause groundwater, surface water and soil pollution, causing great harm to the environment and human body. Due to the large fluctuations in water quality and water volume, high concentration and complex types of pollutants, poor biodegradability, and difficulty in treatment, it is difficult to treat landfill leachate to meet the standards using a single technology. Some existing treatment methods are to prepare landfill leachate, coal and dispersant in a certain proportion into a landfill leachate composite water-coal slurry, and carry out a gasification reaction, thereby achieving efficient and safe disposal of the landfill leachate.

However, the existing landfill leachate pretreatment stirring device often directly puts the materials into the mixing and stirring, which easily leads to slow and uniform mixing, affecting the pretreatment efficiency of the landfill leachate. At the same time, there is also the problem of insufficient mixing, which affects the subsequent gasification process.

Summary of the invention

The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

In view of the problems existing in the above-mentioned existing device for preparing composite water-coal slurry by mixing landfill leachate with coal powder, the present invention is proposed.

Therefore, the object of the present invention is to provide a device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder.

In order to solve the above technical problems, the present invention provides the following technical solutions: a method for treating landfill leachate and coal powder A device for mixing and preparing composite water-coal slurry includes a scraping assembly, including a stirring barrel member, a scraping member for scraping the inner wall of the stirring barrel member; a feeding assembly, including an upper cover member located on the stirring barrel member, a support member fixed on the upper cover member, and a feeding member fixed on the upper cover member; and a stirring assembly, including a stirring member embedded in the middle of the upper cover member, a lifting member for controlling the height of the stirring member, and a bracket member for supporting the lifting member; wherein the scraping member is fixed to the upper cover member by a bearing; and the stirring member extends into the stirring barrel member after penetrating the support member and the upper cover member.

As a preferred solution of the device for preparing a composite water-coal slurry by mixing leachate and coal powder as described in the present invention, the stirring barrel member includes a stirring barrel, and a stirring chamber M is opened on the inner side of the stirring barrel; a first support ring is provided on the inner wall of the stirring barrel; and a second support ring is also provided on the inner wall of the stirring barrel located at the lower side of the first support ring.

As a preferred solution of the device for preparing a composite water-coal slurry by mixing leachate and coal powder as described in the present invention, the scraper member includes a first connecting rod, one end of the first connecting rod is provided with a first gear, the other end of the first connecting rod is provided with a second gear, and the first connecting rod is fixed to the upper cover member through a bearing; an inner gear ring is meshed on the outer side of the first gear, and the inner gear ring is rotatably embedded in the inner wall of the mixing barrel through a first support ring; a plurality of round rods are provided on the lower side of the inner gear ring; the scraper member also includes a scraper bar, and the scraper bar is rotatably embedded in the inner wall of the mixing barrel through a second support ring; a plurality of L-shaped brackets are provided on the inner side of the scraper bar, and the round rods are embedded in the L-shaped brackets; the scraper bar also includes a connecting plate located on the second gear, and a short rod is provided on the connecting plate.

As a preferred solution of the device for preparing a composite water-coal slurry by mixing leachate and coal powder as described in the present invention, the upper cover member includes an upper cover plate, a group of feed ports are opened on the upper cover plate; a movable drawer plate is also slidably provided on the upper cover plate; the upper cover plate is embedded in the mixing barrel.

As a preferred solution of the device for preparing composite water-coal slurry by mixing landfill leachate and coal powder as described in the present invention, the support member includes a support column, a first circular ring is provided on the support column, and a second circular ring is provided on one side of the first circular ring.

As a preferred solution of the device for preparing composite water-coal slurry by mixing landfill leachate and coal powder described in the present invention, the feeding member includes a feeding barrel, and a group of feeding pipes are provided on the outer side of the feeding barrel; the feeding member also includes a baffle plate embedded in the feeding barrel, the upper end of the baffle plate is located on the upper side of the feeding barrel and is connected to one end of a second connecting rod, the other end of the second connecting rod is also provided with a push plate, and the short rod can drive the push plate to rotate; a slewing ring is provided on the outer side of the second connecting rod, and a torsion spring is provided on the outer side of the second connecting rod between the slewing ring and the feeding barrel; one end of the torsion spring is embedded on the outer side of the feeding barrel, and the The other end of the torsion spring is embedded in the lower side of the rotary ring; and the baffle is correspondingly arranged on the upper side of the feed port.

As a preferred solution of the device for preparing a composite water-coal slurry by mixing leachate and coal powder as described in the present invention, the stirring member includes a stirring rod, a first motor is provided at the lower end of the stirring rod, and a stirring blade is provided at the lower end of the first motor; a driving block is also provided on the outer side of the stirring rod; the driving block includes a bent plate, a toggle tooth is provided at one end of the bent plate; the driving block also includes a threaded ring, a positioning bolt is provided at the upper end of the threaded ring; the toggle tooth can drive the second gear to rotate.

As a preferred solution of the device for preparing composite water-coal slurry by mixing landfill leachate with coal powder according to the present invention, the stirring rod passes through the upper cover plate.

As a preferred solution of the device for preparing a composite water-coal slurry by mixing leachate and coal powder as described in the present invention, the lifting member includes a second motor, the output end of the second motor is sleeved with one end of a belt, and the other end of the belt is sleeved with the input end of a ball screw; the ball screw is also provided with a support plate through a matching slider, and the first motor is fixed on the support plate.

As a preferred solution of the device for preparing a composite water-coal slurry by mixing leachate and coal powder as described in the present invention, the support member includes a support body, and a protective shell is also provided on the support body; the second motor and the ball screw are fixed on the protective shell, and the ball screw is fixed on the support body.

The invention has the following beneficial effects: quantitatively concentrated garbage leachate is introduced into a stirring barrel, and then coal powder and sodium wood sulfonate are respectively put into a feeding part according to a certain proportion; a stirring part is controlled to descend to a supporting part position by a lifting part, and the stirring part is controlled to work, and the concentrated garbage leachate is stirred by the stirring part; the stirring part also causes the scraping part to work, and the scraping part scrapes the inner wall of the stirring barrel, thereby preventing some reactants from adhering to the inner wall; the stirring part also causes the feeding part to work, and the feeding part causes the coal powder and sodium wood sulfonate in the feeding part to gradually fall into the stirring barrel for multiple times, thereby fully mixing the garbage leachate, coal powder and sodium wood sulfonate.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

FIG. 1 is a schematic diagram of the overall structure of a device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder according to the present invention.

FIG. 2 is a diagram of the decomposition structure of the device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder according to the present invention. Schematic diagram of the structure.

FIG3 is a schematic diagram of the structure of the scraping assembly described in the device for preparing a composite water-coal slurry by mixing landfill leachate and coal powder according to the present invention.

FIG. 4 is a schematic diagram of the structure of the feeding assembly of the device for preparing a composite water-coal slurry by mixing landfill leachate and coal powder according to the present invention.

FIG. 5 is a schematic diagram of the structure of the stirring assembly of the device for preparing a composite water-coal slurry by mixing landfill leachate and coal powder according to the present invention.

FIG6 is a schematic diagram of the structure of the driving block of the device for preparing a composite water-coal slurry by mixing landfill leachate and coal powder according to the present invention.

DETAILED DESCRIPTION

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

Example 1

1 , a schematic diagram of the overall structure of a device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder is provided. As shown in FIGS. 1-3 , a device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder comprises a scraping assembly 100, comprising a stirring barrel 101, a scraping member 102 for scraping the inner wall of the stirring barrel 101; a feeding assembly 200, comprising an upper cover 201 located on the stirring barrel 101, a support member 202 fixed on the upper cover 201, and a feeding member 203 fixed on the upper cover 201; and a stirring assembly 300, It includes a stirring member 301 embedded in the middle of the upper cover 201, a lifting member 302 for controlling the height of the stirring member 301, and a bracket member 303 for supporting the lifting member 302; wherein the scraping member 102 is fixed to the upper cover 201 through a bearing; the stirring member 301 penetrates the supporting member 202 and the upper cover 201 and then extends into the stirring barrel member 101;

Among them, the quantitatively concentrated landfill leachate is introduced into the mixing barrel 101, and then the coal powder and sodium wood sulfonate are respectively put into the loading part 203 according to a certain proportion; the stirring part 301 is controlled to descend to the position of the supporting part 202 by the lifting part 302, and the stirring part 301 is controlled to work, and the concentrated landfill leachate is stirred by the stirring part 301; the stirring part 301 also makes the scraping part 102 work, and the scraping part 102 scrapes the inner wall of the mixing barrel 101; the stirring part 301 also makes the loading part 203 work, and the loading part 203 makes the coal powder and sodium wood sulfonate in the loading part 203 gradually fall into the mixing barrel 101 in multiple times.

Furthermore, the mixing barrel 101 includes a mixing barrel 101a, and a mixing chamber M is formed inside the mixing barrel 101a; a first support ring 101a-1 is formed on the inner wall of the mixing barrel 101a; and a second support ring 101a-2 is formed on the inner wall of the mixing barrel 101a below the first support ring 101a-1.

The stirring chamber M is a regular cylindrical shape, and the first support ring 101a - 1 and the second support ring 101a - 2 are both close to the upper side of the inner wall of the stirring chamber M.

Furthermore, the scraper 102 includes a first connecting rod 102a, one end of the first connecting rod 102a is provided with a first gear 102a-1, the other end of the first connecting rod 102a is provided with a second gear 102a-2, and the first connecting rod 102a is fixed to the upper cover 201 through a bearing; the outer side of the first gear 102a-1 is meshed with an inner gear ring 102a-1a, and the inner gear ring 102a-1a is rotatably embedded in the inner wall of the mixing barrel 101a through the first support ring 101a-1; the inner gear ring 102a-1 A plurality of round rods 102a-1b are provided on the lower side of a; the wiping member 102 also includes a wiping strip 102c, which is rotatably embedded in the inner wall of the mixing barrel 101a through the second supporting ring 101a-2; a plurality of L-shaped brackets 102c-1 are provided on the inner side of the wiping strip 102c, and the round rods 102a-1b are embedded in the L-shaped brackets 102c-1; the wiping strip 102c also includes a connecting plate 102d located on the second gear 102a-2, and a short rod 102d-1 is provided on the connecting plate 102d;

The first connecting rod 102a is also fixed to the support member 202 through a bearing, and the scraper strip 102c is attached to the inner wall of the mixing barrel 101a. The second gear 102a-2 rotates to drive the first connecting rod 102a and the first gear 102a-1 to rotate. The first gear 102a-1 rotates to drive the inner gear ring 102a-1a to rotate. The inner gear ring 102a-1a rotates to drive the plurality of round rods 102a-1b to rotate. The plurality of round rods 102a-1b rotate to make the plurality of L-shaped brackets 102c-1 drive the scraper strip 102c to rotate. The scraper strip 102c rotates to make the mixing barrel 101a rotate. The inner wall is scraped.

Operation process: the stirring member 301 is controlled to descend to the position of the supporting member 202 through the lifting member 302, and the stirring member 301 is controlled to work. The stirring member 301 works so that the concentrated landfill leachate is stirred; the stirring member 301 also rotates the second gear 102a-2 to drive the first connecting rod 102a and the first gear 102a-1 to rotate, the first gear 102a-1 rotates to drive the inner gear ring 102a-1a to rotate, the inner gear ring 102a-1a rotates to drive a plurality of round rods 102a-1b to rotate, the plurality of round rods 102a-1b rotate to cause a plurality of L-shaped brackets 102c-1 to drive the scraping strip 102c to rotate, the scraping strip 102c rotates to scrape the inner wall of the stirring barrel 101a.

Example 2

1-4, the embodiment is different from the first embodiment in that: the upper cover 201 includes an upper cover plate 201a, and a group of feed ports 201a-1 are provided on the upper cover plate 201a; a movable drawer plate 201a-2 is also slidably provided on the upper cover plate 201a; the upper cover plate 201a is embedded in the mixing barrel 101a;

The upper cover plate 201a is just embedded in the mixing barrel 101a, so that the mixing element 301 can pass through easily.

Furthermore, the support member 202 includes a support column 202a, a first circular ring 202a-1 is provided on the support column 202a, and a second circular ring 202a-2 is provided on one side of the first circular ring 202a-1;

The first connecting rod 102a can be supported by the first circular ring 202a - 1 , and the second circular ring 202a - 2 can position the descending position of the stirring member 301 .

Furthermore, the feeding member 203 includes a feeding barrel 203a, and a group of feeding tubes 203a-1 are provided on the outer side of the feeding barrel 203a; the feeding member 203 also includes a baffle 203b embedded in the feeding barrel 203a, and the upper end of the baffle 203b is located on the upper side of the feeding barrel 203a and is connected to one end of the second connecting rod 203b-1, and the other end of the second connecting rod 203b-1 is also provided with a push plate 203b-1a, and the short rod 102d-1 can drive the push plate 203b -1a rotates; a slewing ring 203b-2 is provided on the outer side of the second connecting rod 203b-1, and a torsion spring 203b-2a is provided on the outer side of the second connecting rod 203b-1 between the slewing ring 203b-2 and the feeding cylinder 203a; one end of the torsion spring 203b-2a is embedded in the outer side of the feeding cylinder 203a, and the other end of the torsion spring 203b-2a is embedded in the lower side of the slewing ring 203b-2; the baffle 203b is correspondingly arranged on the upper side of the feeding port 201a-1;

Among them, through a group of feed pipes 203a-1, coal powder and sodium lignosulfonate can be introduced into the feed barrel 203a for storage respectively. The baffle 203b can be fixed on the feed barrel 203a through a bearing. When the push plate 203b-1a rotates, the second connecting rod 203b-1 drives the slewing ring 203b-2 and the baffle 203b to rotate. The rotation of the slewing ring 203b-2 causes the torsion spring 203b-2a to deform. When the push plate 203b-1a stops rotating, the torsion spring 203b-2a recovers its deformation, causing the slewing ring 203b-2 to return, thereby driving the second connecting rod 203b-1 and the baffle 203b Reset.

The rest of the structure is the same as that of Example 1.

Operation process: The rotation of the second gear 102a-2 also drives the connecting plate 102d and the short rod 102d-1 to rotate, the rotation of the short rod 102d-1 drives the push plate 203b-1a to rotate, the rotation of the push plate 203b-1a drives the second connecting rod 203b-1 and the baffle 203b to rotate, the rotation of the baffle 203b opens a group of feed ports 201a-1, and the coal powder and sodium wood sulfonate in the feed barrel 203a fall into the mixing barrel 101. When the short rod 102d-1 leaves the push plate 203b-1a, the push plate 203b-1a automatically returns to its original position under the action of the torsion spring 203b-2a. At this time, the baffle 203b blocks a group of feed ports 201a-1 again, and the coal powder and sodium wood sulfonate no longer fall. Through the operation of the stirring member 301, the coal powder and sodium wood sulfonate can be dropped from the feed barrel 203a into the mixing barrel 101 in multiple times.

Example 3

1-6, the embodiment is different from the above embodiment in that: the stirring member 301 includes a stirring rod 301a, the lower end of the stirring rod 301a is provided with a first motor 301a-1, and the lower end of the first motor 301a-1 is provided with a stirring blade 301a-2; the outer side of the stirring rod 301a is further provided with a driving block 301a-3; the driving block 301a-3 includes a curved plate 301a-3a, and one end of the curved plate 301a-3a is provided with a toggle tooth 301a-3a-1; the driving block 301a-3 also includes a threaded ring 301a-3b, and the upper end of the threaded ring 301a-3b is further provided with a positioning bolt 301a-3b-1; the toggle tooth 301a-3a-1 can drive the second gear 102a-2 to rotate;

Among them, by turning the tooth 301a-3a-1, the second gear 102a-2 can be driven to rotate intermittently. The outer side of the stirring rod 301a is provided with a thread matching the threaded ring 301a-3b. Rotating the threaded ring 301a-3b can adjust the position of the threaded ring 301a-3b on the stirring rod 301a. The bending plate 301a-3a is embedded in the positioning bolt 301a-3b-1 and then fixed with a nut, thereby fixing the position of the bending plate 301a-3a.

Furthermore, the stirring rod 301a penetrates the upper cover plate 201a.

Furthermore, the lifting member 302 includes a second motor 302a, the output end of the second motor 302a is sleeved with one end of a belt 302a-1, and the other end of the belt 302a-1 is sleeved with the input end of a ball screw 302a-2; the ball screw 302a-2 is also provided with a support plate 302b through a matching slider, and the first motor 301a-1 is fixed on the support plate 302b;

Among them, the second motor 302a drives the belt 302a-1 to work, and the belt 302a-1 drives the ball screw 302a-2 to rotate. The rotation of the ball screw 302a-2 can make the slider matching the ball screw 302a-2 move up and down. The support plate 302b is fixed on the slider, so the support plate 302b moves up and down with the slider, and the up and down movement of the support plate 302b drives the stirring member 301 to move up and down.

Furthermore, the bracket member 303 includes a bracket body 303a, and the bracket body 303a is also provided with a protective The second motor 302a and the ball screw 302a-2 are fixed on the protective shell 303a-1, and the ball screw 302a-2 is fixed on the bracket body 303a;

The support body 303a, the ball screw 302a-2 and the second motor 302a play a supporting role, and the protective shell 303a-1 plays a protective role for the second motor 302a.

The rest of the structure is the same as that of Example 2.

Operation process: Controlling the second motor 302a to work can make the belt 302a-1 work, the belt 302a-1 work to make the ball screw 302a-2 work, the ball screw 302a-2 work to make the support plate 302b move up and down along the guide rod on the ball screw 302a-2 through the slider matched with the ball screw 302a-2, the support plate 302b moves up and down to make the stirring member 301 move up and down;

The first motor 301a-1 is controlled to work so that the stirring rod 301a drives the stirring blade 301a-2 to rotate, and the stirring blade 301a-2 rotates to mix the liquid in the stirring chamber M;

The stirring rod 301a moves downward so that the driving gear 301a-3a-1 on the driving block 301a-3 can indirectly drive the second gear 102a-2 to rotate.

Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values (e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims (10)

A device for preparing composite water-coal slurry by mixing landfill leachate with coal powder, characterized in that it comprises: A scraping assembly (100) comprises a stirring barrel (101) and a scraping member (102) for scraping the inner wall of the stirring barrel (101); A material loading assembly (200) comprises an upper cover member (201) located on the mixing barrel member (101), a support member (202) fixed on the upper cover member (201), and a material loading member (203) fixed on the upper cover member (201); and, A stirring assembly (300), comprising a stirring member (301) embedded in the middle of the upper cover member (201), a lifting member (302) for controlling the height of the stirring member (301), and a support member (303) for supporting the lifting member (302); Wherein, the scraper (102) is fixed on the upper cover (201) via a bearing; The stirring member (301) penetrates the supporting member (202) and the upper cover member (201) and then extends into the stirring barrel member (101). The device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder as claimed in claim 1 is characterized in that: the stirring barrel member (101) comprises a stirring barrel (101a), and a stirring chamber M is provided inside the stirring barrel (101a); A first supporting ring (101a-1) is provided on the inner wall of the mixing barrel (101a); The inner wall of the mixing barrel (101a) is located at the lower side of the first support ring (101a-1) and is also provided with a second support ring (101a-2). The device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder as claimed in claim 2 is characterized in that: the scraper (102) comprises a first connecting rod (102a), one end of the first connecting rod (102a) is provided with a first gear (102a-1), the other end of the first connecting rod (102a) is provided with a second gear (102a-2), and the first connecting rod (102a) is fixed to the upper cover (201) through a bearing; The outer side of the first gear (102a-1) is meshed with an inner gear ring (102a-1a), and the inner gear ring (102a-1a) is rotatably engaged with the inner wall of the mixing barrel (101a) through the first support ring (101a-1); A plurality of round rods (102a-1b) are provided on the lower side of the inner gear ring (102a-1a); The scraping member (102) further comprises a scraping strip (102c), wherein the scraping strip (102c) is rotatably engaged with the inner wall of the mixing barrel (101a) through the second supporting ring (101a-2); A plurality of L-shaped brackets (102c-1) are provided on the inner side of the scraping strip (102c), and the round rod (102a-1b) is embedded in the L-shaped bracket (102c-1); The wiper strip (102c) further comprises a connecting plate (102d) located on the second gear (102a-2). The connecting plate (102d) is provided with a short rod (102d-1). The device for preparing composite water-coal slurry by mixing landfill leachate and coal powder as claimed in claim 3 is characterized in that: the upper cover (201) comprises an upper cover plate (201a), and a group of feed ports (201a-1) are provided on the upper cover plate (201a); The upper cover plate (201a) is also slidably provided with a movable drawer plate (201a-2); The upper cover plate (201a) is embedded in the mixing barrel (101a). The device for preparing a composite water-coal slurry by mixing landfill leachate and coal powder as described in claim 4 is characterized in that: the support member (202) includes a support column (202a), a first ring (202a-1) is provided on the support column (202a), and a second ring (202a-2) is provided on one side of the first ring (202a-1). The device for preparing composite water-coal slurry by mixing landfill leachate with coal powder as claimed in claim 5 is characterized in that: the feeding member (203) comprises a feeding cylinder (203a), and a group of feeding pipes (203a-1) are provided on the outer side of the feeding cylinder (203a); The feeding member (203) further comprises a baffle (203b) embedded in the feeding barrel (203a), the upper end of the baffle (203b) being located on the upper side of the feeding barrel (203a) and connected to one end of a second connecting rod (203b-1), the other end of the second connecting rod (203b-1) being further provided with a push plate (203b-1a), and the short rod (102d-1) can drive the push plate (203b-1a) to rotate; A slewing ring (203b-2) is provided on the outer side of the second connecting rod (203b-1), and a torsion spring (203b-2a) is provided on the outer side of the second connecting rod (203b-1) between the slewing ring (203b-2) and the feeding cylinder (203a); One end of the torsion spring (203b-2a) is embedded in the outer side of the feed cylinder (203a), and the other end of the torsion spring (203b-2a) is embedded in the lower side of the rotating ring (203b-2); The baffle (203b) is correspondingly arranged on the upper side of the feed inlet (201a-1). The device for preparing composite water-coal slurry by mixing landfill leachate and coal powder as claimed in claim 4 or 6, characterized in that: the stirring member (301) comprises a stirring rod (301a), a first motor (301a-1) is provided at the lower end of the stirring rod (301a), and a stirring blade (301a-2) is provided at the lower end of the first motor (301a-1); A driving block (301a-3) is also provided on the outer side of the stirring rod (301a); The driving block (301a-3) comprises a curved plate (301a-3a), and one end of the curved plate (301a-3a) is provided with a shifting tooth (301a-3a-1); The driving block (301a-3) further comprises a threaded ring (301a-3b), and a positioning bolt (301a-3b-1) is further provided at the upper end of the threaded ring (301a-3b); The shifting tooth (301a-3a-1) can drive the second gear (102a-2) to rotate. The device for preparing a composite water-coal slurry by mixing landfill leachate with coal powder as described in claim 7 is characterized in that: the stirring rod (301a) passes through the upper cover plate (201a). The device for preparing composite water-coal slurry by mixing landfill leachate with coal powder as claimed in claim 8 is characterized in that: the lifting member (302) comprises a second motor (302a), the output end of the second motor (302a) is sleeved with one end of a belt (302a-1), and the other end of the belt (302a-1) is sleeved with the input end of a ball screw (302a-2); The ball screw (302a-2) is also provided with a support plate (302b) via a matching slider, and the first motor (301a-1) is fixed on the support plate (302b). The device for preparing composite water-coal slurry by mixing landfill leachate and coal powder as claimed in claim 9 is characterized in that: the support member (303) comprises a support body (303a), and a protective shell (303a-1) is further provided on the support body (303a); The second motor (302a) and the ball screw (302a-2) are fixed on the protective shell (303a-1), and the ball screw (302a-2) is fixed on the bracket body (303a).