Slurry concentration system and method

Abstract

The invention discloses a slurry concentration system and method. Relates to the technical field of slurry concentration in a raw material preparation section, and comprises an evaporation diffusion channel, a channel cover plate is arranged at the top of the evaporation diffusion channel, a slurry inlet tank is arranged at one end of the evaporation diffusion channel, a slurry outlet tank is arranged at the other end of the evaporation diffusion channel, and the slurry inlet tank is externally connected with a slurry pump which can convey slurry in a slurry storage tank into the slurry inlet tank and flow into the slurry outlet tank along the evaporation diffusion channel; the gas generation module is arranged at the end, close to the slurry outlet pool, of the evaporation and diffusion channel and can introduce dry gas into the evaporation and diffusion channel, and a flowing channel of the dry gas is located between the slurry evaporation interface and the channel cover plate. The heat exchange module can heat the dry gas, the slurry conveyed to the slurry inlet pool and the slurry flowing in the evaporation and diffusion channel through flue gas waste heat. The slurry concentration device can improve the slurry concentration efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of slurry concentration in a raw material preparation section, and in particular to a slurry concentration system and method. Background Art

[0002] Both ceramic firing kilns and spray drying towers rely on the heat energy generated by fuel combustion for production, and emit a large amount of flue gas (waste gas). These flue gases have low temperature, large volume, and high thermal enthalpy, and are basically discharged directly after desulfurization and denitrification treatment.

[0003] In the production process of ceramic wall and floor tiles, various raw materials are mixed in a certain ratio, ball-milled into mud slurry, and then the products are produced through processes such as aging, spray drying to make powder, pressing, high-temperature sintering, and edge grinding and polishing. In the slurry making stage, the water content of the ball-milled mud slurry must be kept at about 35% due to the constraints of the ball milling process. In the powder making stage, the mud water needs to be evaporated and dried to a powder with a water content of about 7%; the energy consumption required in the evaporation process is relatively high. Therefore, reducing the water content of the mud as much as possible before powdering is the most direct energy-saving method in the mud powder making process.

[0004] Ceramic raw material mud has good fluidity and good suspension. In addition to squeezing, it is impossible to use precipitation or centrifugal dehydration methods to concentrate and remove water. In the prior art, some people have tried to use the flue gas waste heat of ceramic firing kilns or the waste heat of spray drying tower exhaust gas to heat the mud. However, the temperature of these flue gases is only about 80°C, which does not reach the boiling temperature value for water evaporation. It only increases the temperature of the mud, and the amount of water evaporated in the mud is small and the evaporation rate is low, which cannot achieve the purpose of efficient concentration.

[0005] The purpose of concentrated slurry is to reduce the amount of water evaporated in the spray drying process and reduce energy consumption. Therefore, in addition to using the waste heat of flue gas, it is impossible to introduce other heat sources. Based on this, it is urgent to design a technical solution that can improve the efficiency of slurry concentration. Summary of the invention

[0006] The object of the present invention is to provide a mud concentration system and method to solve the problems existing in the above-mentioned prior art and to improve the mud concentration efficiency.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides a mud concentration system, comprising:

[0009] An evaporation diffusion channel, with a channel cover plate on the top, a slurry inlet pool at one end and a slurry outlet pool at the other end, the slurry inlet pool is externally connected to a mud pump, which can transport the mud in the slurry storage pool to the slurry inlet pool, and flow along the evaporation diffusion channel to the slurry outlet pool;

[0010] A gas generating module is arranged at one end of the evaporation diffusion channel close to the pulp outlet tank, and can introduce dry gas into the evaporation diffusion channel, and the flow channel of the dry gas is located between the mud evaporation interface and the channel cover plate;

[0011] The heat exchange module can use the waste heat of flue gas to heat the drying gas, the mud transported to the slurry inlet pool, and the mud flowing in the evaporation diffusion channel respectively.

[0012] Preferably, the evaporation and diffusion channel is a rectangular structure, which includes a channel bottom plate, side plates are fixedly and sealedly provided on both sides of the channel bottom plate, and the channel cover plate is provided on the side plates; the pulp inlet pool and the pulp outlet pool are respectively fixedly provided at both ends of the channel bottom plate, and the two ends of the channel bottom plate are respectively connected to the side walls of the pulp inlet pool and the pulp outlet pool.

[0013] Preferably, it also includes a heating pool, wherein a plurality of rectangular openings are opened on the channel bottom plate, and a heating pool is provided at each rectangular opening; the top of the heating pool is open, and includes a pool side plate, a pool end plate and a pool bottom plate; the pool end plate is parallel to the side plate, and the pool side plate is perpendicular to the side plate, the top of the pool end plate is fixedly sealed and connected to the bottom of the side plate on the same side, and the pool end plate is located outside the rectangular opening; the top of the pool side plate is fixedly sealed and connected to the corresponding inner wall of the rectangular opening of the channel bottom plate, and is flush with the upper surface of the channel bottom plate, when the mud flows to the pool side plate corresponding to the rectangular opening, it flows downward along the pool side plate into the heating pool; a partition plate parallel to the pool side plate is fixedly provided on the pool bottom plate, and the partition plate divides the interior of the heating pool into a front heating cavity and a rear heating cavity, and the bottom of the front heating cavity and the bottom of the rear heating cavity are respectively connected to the inlet and outlet of the heat exchange module through a connecting pipe, and a mud pump is provided on the connecting pipe.

[0014] Preferably, multiple scraper plates are provided in the front temperature-increasing cavity and the rear temperature-increasing cavity, and the scraper plates are arranged vertically to the partition plate. The multiple scraper plates in the front temperature-increasing cavity are fixedly sleeved on the first scraper shaft, and the multiple scraper plates in the rear temperature-increasing cavity are fixedly sleeved on the second scraper shaft. One end of the first scraper shaft and the second scraper shaft are movably inserted into the adjacent pool end plate, and one end of the first scraper shaft and the second scraper shaft are connected to a cylinder after passing through the adjacent pool end plate.

[0015] Preferably, the heat exchange module is a shell and tube heat exchanger, including a shell side, a tube side and a cavity cover; the shell side is a heat exchange shell, the left and right ends of the heat exchange shell are respectively connected to the cavity cover, and the upper and lower ends of the heat exchange shell are respectively provided with a flue gas inlet and a flue gas outlet; the tube side is a heat exchange component, and a plurality of layers of the heat exchange components are fixedly arranged in the heat exchange shell, and the plurality of layers of the heat exchange components are sequentially connected end to end through hoses; and one end of the heat exchange component located at the top is connected to a mud inlet, and the other end of the heat exchange component located at the bottom is connected to a mud outlet; and warping pieces are welded to the outside of the heat exchange component.

[0016] Preferably, the heat exchange assembly includes a heat exchange tube and an end mud collection chamber, each layer of the heat exchange tube is respectively connected to an end mud collection chamber at both ends, the chamber cover is arranged at the end of the end mud collection chamber away from the heat exchange tube, and the flap is welded to the outer wall of the heat exchange tube; the hose is connected to the end mud collection chamber of the heat exchange assembly.

[0017] Preferably, a plurality of scrapers are provided in the end mud collection chamber, and the scrapers are fixedly sleeved on a horizontally arranged scraper shaft, the scraper shaft is perpendicular to the length direction of the heat exchange tube, and one end of the scraper shaft passes through the end mud collection chamber and is connected to a cylinder.

[0018] Preferably, the gas generating module comprises a fan, one end of which is connected to an air inlet via a rotary dehumidifier, and the other end of which is connected to the heat exchange module, so that the dried gas can be passed into the evaporation diffusion channel after heat exchange and temperature increase through the heat exchange module.

[0019] Preferably, a reciprocating stirring device is provided in the evaporation diffusion channel, and the reciprocating stirring device includes a translation beam, a sliding platform is provided on the inner side of each side plate, the sliding platform is located below the channel cover plate, and a translation beam is slidably provided on the sliding platform; the two translation beams are fixedly connected by a connecting beam; the bottom of the translation beam is connected to the sliding platform in sliding contact through a wear-resistant strip, and the bottom of the translation beam is provided with a guide groove at the position on both sides of the wear-resistant strip, and two T guide strips are fixedly provided on the sliding platform, and the top of the T guide strip is movably provided in the corresponding guide groove, and the translation beam is externally connected to a sliding and translation driving mechanism; the two translation beams are fixedly connected to the sliding platform by a connecting beam; A plurality of wheel shafts are connected between the shifting beams through bearings, a plurality of wheel hubs are fixedly provided on the wheel shafts, and a plurality of blades are provided between two adjacent wheel hubs; a gear is installed at one end of the wheel shaft, and a rack is fixedly installed at the edge of the side plate close to one end of the gear, and the gear is meshed with the rack; the reciprocating stirring device can drive the wheel to translate while causing the wheel to rotate, and when the translation directions of the wheel are different, the rotation directions of the wheel are opposite; that is, when the reciprocating stirring device drives the wheel to translate along the direction of mud flow, the wheel rotates in the forward direction, and when the reciprocating stirring device drives the wheel to translate in the reverse direction opposite to the direction of mud flow, the wheel rotates in the reverse direction.

[0020] The present invention also provides a mud concentration method using the above mud concentration system, comprising the following steps:

[0021] The slurry heated by the heat exchange module is continuously introduced into the inlet pool. When the height of the slurry in the inlet pool is greater than the channel bottom plate, the slurry flows along the channel bottom plate toward the outlet pool. During the flow, the slurry is heated by the heat exchange module at the channel bottom plate.

[0022] The blades of the reciprocating stirring device move horizontally and stir the mud in the evaporation diffusion channel, so that the mud does not agglomerate or precipitate;

[0023] The gas generation module continuously passes the dry gas heated by the heat exchange module into the evaporation diffusion channel from one end close to the slurry outlet pool, forming a counter-flow with the mud and taking away the evaporated water.

[0024] Compared with the prior art, the present invention has achieved the following technical effects:

[0025] The present invention uses the principle of evaporation and diffusion to concentrate mud. When the temperature of water is higher than the ambient temperature, water evaporates. The higher the water temperature, the greater the evaporation amount. Based on the characteristic that water evaporates when the temperature is higher than the ambient temperature, the present invention heats up the mud with flue gas with waste heat, so that the water in the mud can evaporate. The mud after heat exchange and temperature increase flows slowly in the evaporation and diffusion channel, and then the evaporation surface of the mud is blown, and the dry gas after heat exchange and temperature increase by flue gas is continuously introduced to form forced convection, so that the evaporation surface of the mud becomes turbulent, and the diffusion speed of water vapor in the air is enhanced to form evaporation, thereby reducing the water content on the surface of the mud and achieving the purpose of efficient concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0027] Figure 1 A schematic diagram of the arrangement of a mud concentration system in one or some embodiments of the present invention;

[0028] Figure 2 A partial top view schematic diagram of a mud concentration system in one or some embodiments of the present invention;

[0029] Figure 3 A schematic diagram of a partial structure of a mud concentration system in one or some embodiments of the present invention;

[0030] Figure 4 A schematic diagram of the arrangement structure of a reciprocating stirring device in one or some embodiments of the present invention;

[0031] Figure 5 It is a partial enlarged schematic diagram of a reciprocating stirring device in one or some embodiments of the present invention;

[0032] Figure 6 A schematic diagram of a heat exchange module in one or some embodiments of the present invention;

[0033] Figure 7 A side view of a heat exchange module in one or some embodiments of the present invention;

[0034] Figure 8 A cross-sectional view of a heat exchange module in one or some embodiments of the present invention;

[0035] Fig. 9 A schematic diagram of the structure of a rotating wheel in one or some embodiments of the present invention;

[0036] Fig.10A schematic diagram of a heating pool perpendicular to one side of the evaporation diffusion channel in one or some embodiments of the present invention;

[0037] Fig.11 A schematic cross-sectional view of a heating pool parallel to one side of the evaporation diffusion channel in one or some embodiments of the present invention;

[0038] Fig.12 It is a schematic top view of a heating pool in one or some embodiments of the present invention.

[0039] In the figure: 1-evaporation diffusion channel, 101-channel cover plate, 102-channel bottom plate, 2-slurry inlet pool, 3-slurry outlet pool, 4-heat exchange module, 401-heat exchange shell, 402-chamber cover, 403-smoke inlet, 404-smoke outlet, 405-mud inlet, 406-mud outlet, 407-heat exchange tube, 408-end mud collection chamber, 409-hose, 410-scraper, 411-scraper shaft, 412-cylinder, 5-heating pool, 501-pool End plate, 502-pool side plate, 503-partition plate, 504-warming front cavity, 505-warming rear cavity, 506-pipe connection, 507-scraper plate, 508-first scraper shaft, 509-second scraper shaft, 510-pool bottom plate, 6-fan, 7-rotating disc dehumidifier, 8-translation beam, 9-connecting beam, 10-wear-resistant strip, 11-T guide strip, 12-rotor shaft, 13-rotor hub, 14-blade, 15-gear, 16-rack, 17-mud pump. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The object of the present invention is to provide a mud concentration system and method to solve the problems existing in the above-mentioned prior art and to improve the mud concentration efficiency.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Ceramic raw material mud has good fluidity and good suspension. Except for squeezing, it is impossible to use precipitation or centrifugal dehydration to concentrate and remove water. Some people try to use pressure filtration to remove part of the water, but the mud contains a lot of trace ultrafine components, which are also an indispensable component of the formula, and some are even as fine as 2000 mesh or less. In the process of filtration and concentration, these ultrafine components will inevitably be filtered out, which will seriously affect the product quality. Therefore, it is not suitable for concentration by precipitation or centrifugal dehydration. In the prior art, some people use the principle of shell and tube heat exchanger to make the mud flow in the tube as a refrigerant, and the flue gas with waste heat is used as a heat medium. Although the mud is heated, it does not reach the boiling temperature, and the amount of water evaporated is negligible, which leads to the heat exchange investment cost compared with the temperature of the mud. It is more expensive and cannot be successfully applied. The purpose of concentrating the mud is to reduce the amount of water evaporated in the spray drying section and reduce energy consumption. Therefore, in addition to using the waste heat of flue gas, it is impossible to introduce other heat sources.

[0044] In order to solve the above problems, the present invention provides a mud concentration system, referring to Figures 1 to 12 As shown, it includes an evaporation diffusion channel 1, a gas generation module, and a heat exchange module 4. The evaporation diffusion channel 1 is a rectangular structure, which includes a channel bottom plate 102, and side plates are fixedly and sealed on both sides of the channel bottom plate 102, and a channel cover plate 101 is arranged on the side plate; the pulp inlet pool 2 and the pulp outlet pool 3 are respectively fixedly arranged at both ends of the channel bottom plate 102, and the two ends of the channel bottom plate 102 are respectively connected to the side walls of the pulp inlet pool 2 and the pulp outlet pool 3. The slurry inlet pool 2 is externally connected to a mud pump 17, which can transport the mud in the slurry storage pool in the factory to the slurry inlet pool 2. When the mud in the slurry inlet pool 2 becomes more and more, the mud height gradually becomes greater than the height of the channel bottom plate 102. Under the effect of the height difference, the mud in the slurry inlet pool 2 slowly flows along the evaporation diffusion channel 1 to the slurry outlet pool 3, and the length of the evaporation diffusion channel 1 is long enough; the gas generating module is arranged at one end of the evaporation diffusion channel 1 close to the slurry outlet pool 3, which can introduce dry gas into the evaporation diffusion channel 1, and the flow channel of the dry gas is located between the mud evaporation interface and the channel cover 101, the dry gas flows to one end close to the slurry inlet pool 2, and is discharged from the gas outlet above one end of the slurry inlet pool 2; the heat exchange module 4 can use the waste heat of the flue gas to heat the dry gas, the mud transported to the slurry inlet pool 2, and the mud flowing in the evaporation diffusion channel 1 respectively.

[0045] The cross section of the evaporation diffusion channel 1 of the present invention is rectangular, and the mud heated by heat exchange below and the dry air heated by heat exchange above evaporate at the interface between the mud and the air, and diffuse in the air flowing over the evaporation diffusion channel 1. The air blown into the evaporation diffusion channel 1 is first dehumidified to reduce the moisture content of the air, and then exchanges air with the flue gas to increase the air flow temperature. The higher the air temperature and the lower the initial moisture content, the greater the diffusion driving force, and the more conducive it is to take away the water evaporated from the mud surface. The present invention is based on the characteristic that water can evaporate when the temperature is higher than the ambient temperature, so that the mud is heated and the water evaporates, and then the mud evaporation surface is blown. The wind direction is opposite to the mud flow direction, and convection is forced to make it turbulent, thereby enhancing the diffusion rate of water vapor in the air. This situation is called evaporation, which reduces the moisture on the surface of the mud and achieves the purpose of concentration. According to the Navier-Stokes equation in the prior art, and the mature and known k-ε and k-ω turbulence models in the prior art, the greater the airflow speed, the more violent the turbulence, the better the evaporation effect, and the more moisture is removed. Therefore, the present invention adopts high-speed dry hot air, combined with the mud after heat exchange with the flue gas, to achieve the removal of moisture from the mud.

[0046] In the process of forced convection evaporation, the evaporation diffusion channel 1 is long, and the mud flowing slowly over a long distance will cool down. In order to ensure the evaporation efficiency, the present embodiment sets a number of heating points, that is, a plurality of rectangular openings are opened on the channel bottom plate 102, and a heating pool 5 is set at each rectangular opening. The heating pool 5 includes two symmetrical pool side plates 502, two symmetrical pool end plates 501 and a pool bottom plate 510, thereby forming a rectangular sealed pool structure with an open top and a hollow interior. The pool end plates 501 are parallel to the side plates of the evaporation diffusion channel 1 and are located on the outside of the rectangular opening. The pool side plates 502 are perpendicular to the side plates of the evaporation diffusion channel 1, and the upper part of the pool end plates 501 is fixedly sealed and connected to the side plates on the same side; the top surface of the pool side plates 502 and the rectangular surface of the channel bottom plate 102 are connected. The corresponding inner wall of the shaped opening is fixedly sealed and connected, and the top surface of the pool side plate 502 is flush with the channel bottom plate 102; a partition 503 parallel to the pool side plate 502 is fixedly provided on the pool bottom plate 510, and the partition 503 divides the interior of the heating pool 5 into a front heating cavity 504 and a rear heating cavity 505. The bottom of the front heating cavity 504 and the bottom of the rear heating cavity 505 are respectively connected to the inlet and outlet of the heat exchange module 4 through the connecting pipe 506, and the connecting pipe 506 is provided with a mud pump 17. At the position beyond the top of the partition 503, the mud of the front heating cavity 504 and the rear heating cavity 505 can be connected. The pre-warming cavity 504 is located at the mud inflow position. When the mud flowing on the channel bottom plate 102 flows to the warming point, it will enter the pre-warming cavity 504. The mud pump 17 extracts low-temperature mud from the bottom of the pre-warming cavity 504 through the pipe 506. After the heat exchange module 4 heats up the flue gas, it returns to the post-warming cavity 505 through another pipe 506 and the mud pump 17. The top surface of the pool side plate 502 is flush with the upper surface of the channel bottom plate 102, and the height of the partition plate 503 is slightly higher than the upper surface of the channel bottom plate 102. Therefore, when the heating pool 5 is not needed to heat the mud, the valves of the pipe 506 at the bottom of the front heating chamber 504 and the bottom of the rear heating chamber 505 are closed, and the mud can enter the front heating chamber 504. When the mud inside it becomes more and more, it can overflow the partition 503 and enter the rear heating chamber 505, and then overflow the pool side plate 502 and continue to flow backward along the channel bottom plate 102. When heating is required, after heating, when the mud entering the rear heating chamber 505 from the front heating chamber 504 exceeds the height of the upper surface of the channel bottom plate 102, it can continue to flow backward. Since the height of the partition 503 is slightly higher than the channel bottom plate 102, the partition 503 acts as a barrier at this time, which can prevent the mud in the rear heating chamber 505 from flowing back into the front heating chamber 504.

[0047] The heat exchange module 4 of this embodiment adopts a shell and tube heat exchanger, including a shell side, a tube side and a cavity cover 402, and the cavity cover 402 is a detachable structure; the shell side is a heat exchange shell 401, and the left and right ends of the heat exchange shell 401 are respectively connected to the cavity cover 402, and the upper and lower ends of the heat exchange shell 401 are respectively provided with a flue gas inlet 403 and a flue gas outlet 404; the tube side is a heat exchange component made of metal, and a multi-layer heat exchange component is fixedly arranged in the heat exchange shell 401, and the multi-layer heat exchange components are sequentially connected end to end through a hose 409; and located One end of the uppermost heat exchange component is connected to a mud inlet 405, and the other end of the lowermost heat exchange component is connected to a mud outlet 406; a flap is welded on the outside of the heat exchange component, so that the mud enters the uppermost heat exchange component from the mud inlet 405, and then flows through multiple heat exchange components in sequence, and then flows out from the slurry outlet at the end of the lowermost heat exchange component. During this period, the flue gas with residual heat flows through the flue gas inlet 403 to the flue gas outlet 404, realizing heat exchange and temperature increase of the mud in the heat exchange component, and the flap increases the heat exchange area. The flue gas is the flue gas with residual heat discharged from the ceramic firing kiln in the prior art, and the flue gas can be transported to the flue gas inlet 403 through the existing exhaust pipe with valve control to realize the utilization of the flue gas residual heat.

[0048] In a specific embodiment, the heat exchange assembly includes a heat exchange tube 407 and an end mud collection chamber 408. Five layers of heat exchange tubes 407 are evenly fixed in the heat exchange shell 401, each layer includes a plurality of thin metal tubes arranged in parallel and spaced apart, and a warping plate is welded on the outside of the heat exchange tube 407; the end mud collection chamber 408 is located in the heat exchange shell 401 near the chamber cover 402, and five layers of end mud collection chambers 408 arranged in an up-and-down manner are arranged on both ends of the heat exchange shell 401, and both ends of each layer of heat exchange tubes 407 are respectively connected to the end mud collection chamber 408 of the same layer; as shown in the figure, the end mud collection chamber 408 located at the top of the left end of the heat exchange shell 401 is externally connected to the mud inlet 405, and the end mud collection chamber 408 located at the second end from top to bottom on the left end of the heat exchange shell 401 is connected to the end mud collection chamber 408 of the same layer. The collecting chamber 408 is connected to the third end mud collecting chamber 408 at the same end through a hose 409, the fourth end mud collecting chamber 408 from top to bottom at the left end of the heat exchange shell 401 is connected to the fifth end mud collecting chamber 408 at the same end through a hose 409, the first end mud collecting chamber 408 from top to bottom at the right end of the heat exchange shell 401 is connected to the second end mud collecting chamber 408 at the same end through a hose 409, the third end mud collecting chamber 408 from top to bottom at the right end of the heat exchange shell 401 is connected to the fourth end mud collecting chamber 408 at the same end through a hose 409, and the end mud collecting chamber 408 at the lowest right end of the heat exchange shell 401 is externally connected to a mud outlet 406, thereby forming a connecting structure connected end to end.

[0049] The gas generating module of the present embodiment comprises a fan 6, one end of which is connected to an air inlet via a rotary dehumidifier 7 of an existing known structure, and the other end of the fan 6 is connected to a heat exchange module 4, so that the dried gas can be passed into the evaporation diffusion channel 1 after heat exchange and temperature increase through the heat exchange module 4. The heat exchange module 4 at the gas generating module can have the same structure as other heat exchange modules 4 used for mud, with the difference that the mud is replaced by dry gas, and the heat exchange and temperature increase of the dry gas is achieved by utilizing the waste heat of the flue gas. The heat exchange module at the gas generating module can also be replaced by a conventional gas-to-gas heat exchanger in other embodiments, which can also achieve the heat exchange and temperature increase function of the dry gas.

[0050] In view of the good fluidity and high viscosity of ceramic mud, the mud will inevitably stick to the wall, precipitate, and agglomerate during the heat exchange and transportation of the mud. In order to solve this problem, the present invention designs a scraping mechanism. In one embodiment, a plurality of vertically arranged scraping plates 507 are provided in the pre-warming cavity 504 and the post-warming cavity 505. The scraping plates 507 are arranged perpendicular to the partition plate 503, and the plurality of scraping plates 507 in the pre-warming cavity 504 are fixedly sleeved on the first scraping shaft 508, and the plurality of scraping plates 507 in the post-warming cavity 505 are fixedly sleeved on the second scraping shaft 509. Both ends of the first scraping shaft 508 and the second scraping shaft 509 are movably connected to the pool end plate 501 at the corresponding end through connecting parts such as bearings, and one end of the first scraping shaft 508 is connected to the cylinder 412, and one end of the second scraping shaft 509 is connected to the cylinder 412. The cylinder 412 is extended and retracted to drive the corresponding first scraper shaft 508 or the second scraper shaft 509 to move forward and backward, thereby driving the scraper plate 507 on the shaft to move forward and backward, thereby scraping the side walls and the inner bottom of the cavity, so that the mud that sticks to the wall, precipitates, and agglomerates is scraped off and flows out with the flowing mud; in another embodiment, one end of the first scraper shaft 508 is located in the front chamber 504 before warming, and does not contact the adjacent pool end plate 501. The other end of the first scraper shaft 508 passes through the adjacent pool end plate 501 and is connected to the cylinder. The arrangement of the second scraper shaft 509 is the same as that of the first scraper shaft 508.

[0051] Similarly, in this embodiment, a plurality of scrapers 410 are provided in the end mud collection chamber 408. The scrapers 410 are fixedly mounted on a horizontally arranged scraper shaft 411. The scraper shaft 411 is perpendicular to the length direction of the heat exchange tube 407. One end of the scraper shaft 411 passes through the end mud collection chamber 408 and is connected to a cylinder 412. The scraping operation mode is the same as that of the scraper 507, and the mud that is adhered to the wall, precipitated, and agglomerated in the end mud collection chamber 408 can be scraped off, and the mud can be moved backward following the flowing mud.

[0052] The mud flows slowly in the evaporation diffusion channel 1, and it will also stick to the wall and form lumps. In order to solve this problem, a reciprocating stirring device is provided in the evaporation diffusion channel 1 of this embodiment. The reciprocating stirring device includes a translation beam 8. A sliding platform is provided on the inner side of each side plate. The sliding platform is located under the channel cover plate 101, and a translation beam 8 is slidably provided on the sliding platform; the two translation beams 8 are fixedly connected by a connecting beam 9; the bottom of the translation beam 8 is connected to the sliding platform through a wear-resistant strip 10 for sliding contact, similar to the structure of a slider and a slide rail, and the two can achieve relative sliding; the bottom of the translation beam 8 is provided with a guide groove at the position on both sides of the wear-resistant strip 10, and two T guide strips 11 are fixedly provided on the sliding platform, and the vertical section of the T guide strip 11 from the left end or the right end of the evaporation diffusion channel 1 in the attached figure is a T-shaped structure. The structure can cooperate with the guide groove to play a guiding role, so it is named T guide bar 11. The top of the T guide bar 11 is movably arranged in the corresponding guide groove. The translation beam 8 is externally connected with a sliding translation drive mechanism of a known structure. The sliding translation drive mechanism can adopt a screw nut pair or a horizontally arranged hydraulic cylinder or a motor, etc., as long as it can realize the horizontal back and forth movement of the translation beam 8; a plurality of rotating wheels are arranged between the two translation beams 8, and the rotating wheel includes a rotating wheel shaft 12 connected between the two translation beams 8 through a bearing, and a plurality of rotating wheel hubs 13 are fixedly penetrated on the rotating wheel shaft 12, and a plurality of blades 14 are arranged between two adjacent rotating wheel hubs 13; a gear 15 is installed at one end of the rotating wheel shaft 12, and a rack 16 is fixedly installed at the edge of the side plate close to one end of the gear 15, and the gear 15 is meshed with the rack 16.

[0053] The length of the blade 14 is close to the inner width of the channel bottom plate 102, and the height is based on the edge of the blade 14 scraping the bottom surface of the channel bottom plate 102. When the translation beam 8 translates, the runner also translates, and the gear 15 is forced to rotate through the meshing of the gear 15 and the rack 16, driving the runner to rotate. Since the diameter of the runner is larger than the diameter of the gear 15, the linear velocity of the runner edge is larger than the translation velocity, so that the blade 14 has the function of rotating and scraping mud. When the translation beam 8 moves back and forth, the runner rotates forward and reversely. At any time, there are blades 14 immersed in the mud, and there are blades 14 exposed in the airflow. The blades 14 immersed in the mud have a stirring effect on the mud, and the exposed blades 14 not only increase the evaporation area, but also strengthen the turbulence of the airflow and enhance the evaporation rate; the above-mentioned runners are connected in series so that these runners can move back and forth as a whole along the length direction of the channel; in this way, the runner has both translation and rotation functions, translation scraping, rotation stirring, and preventing the mud from settling and agglomerating in the mud pool.

[0054] The present invention also provides a mud concentration method using the above mud concentration system, comprising the following steps:

[0055] The slurry after heat exchange and temperature increase by the heat exchange module 4 is continuously introduced into the inlet pool 2. When the height of the slurry in the inlet pool 2 is greater than the channel bottom plate 102, the slurry flows along the channel bottom plate 102 toward the outlet pool 3. During the flow, the slurry exchanges heat and temperature with the heat exchange module 4 at the channel bottom plate 102 respectively.

[0056] The blades 14 of the reciprocating stirring device stir the slurry in the evaporation diffusion channel 1;

[0057] The gas generation module continuously passes the dry gas after heat exchange and temperature increase by the heat exchange module 4 into the evaporation diffusion channel 1 from one end close to the slurry outlet pool 3, forming a countercurrent flow with the mud to take away the evaporated moisture. The gas is first dehumidified to reduce the air moisture content, and then heat-exchanges with the waste heat flue gas to increase the air flow temperature. The higher the gas temperature, the lower the initial moisture content, the greater the diffusion driving force, and the more conducive to taking away the moisture on the surface of the mud. In addition to reducing the moisture content of the mud, the present invention does not change the distribution ratio of each group of the mud, and the performance of the powder obtained subsequently remains unchanged, which meets the requirements of the ceramic production process.

[0058] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A mud thickening system, characterized in that: include: An evaporation diffusion channel, with a channel cover plate on the top, a slurry inlet pool at one end and a slurry outlet pool at the other end, the slurry inlet pool is externally connected to a mud pump, which can transport the mud in the slurry storage pool to the slurry inlet pool, and flow along the evaporation diffusion channel to the slurry outlet pool; A gas generating module is arranged at one end of the evaporation diffusion channel close to the pulp outlet tank, and can introduce dry gas into the evaporation diffusion channel, and the flow channel of the dry gas is located between the mud evaporation interface and the channel cover plate; The heat exchange module can use the waste heat of flue gas to heat the drying gas, the mud transported to the slurry inlet pool, and the mud flowing in the evaporation diffusion channel respectively.

2. The mud concentration system according to claim 1, characterized in that: The evaporation and diffusion channel is a rectangular structure, which includes a channel bottom plate, side plates are fixedly and sealedly provided on both sides of the channel bottom plate, and the channel cover plate is provided on the side plates; the pulp inlet pool and the pulp outlet pool are respectively fixedly arranged at the two ends of the channel bottom plate, and the two ends of the channel bottom plate are respectively connected to the side walls of the pulp inlet pool and the pulp outlet pool.

3. The mud concentration system according to claim 2, characterized in that: It also includes a heating pool, a plurality of rectangular openings are opened on the channel bottom plate, and a heating pool is provided at each rectangular opening; the heating pool includes a pool side plate, a pool end plate and a pool bottom plate; the pool end plate is parallel to the side plate, and the pool side plate is perpendicular to the side plate, the top of the pool end plate is fixedly and sealedly connected to the bottom of the side plate on the same side, the top of the pool side plate is fixedly and sealedly connected to the corresponding inner wall of the rectangular opening of the channel bottom plate, and is flush with the upper surface of the channel bottom plate; a partition parallel to the pool side plate is fixedly provided on the pool bottom plate, the partition divides the interior of the heating pool into a front heating cavity and a rear heating cavity, the bottom of the front heating cavity and the bottom of the rear heating cavity are connected to the inlet and outlet of the heat exchange module respectively through a connecting pipe, and a mud pump is provided on the connecting pipe.

4. The mud concentration system according to claim 3, characterized in that: Multiple scraper plates are provided in the front temperature-increasing cavity and the rear temperature-increasing cavity, and the scraper plates are arranged vertically to the partition plate. The multiple scraper plates in the front temperature-increasing cavity are fixedly sleeved on the first scraper shaft, and the multiple scraper plates in the rear temperature-increasing cavity are fixedly sleeved on the second scraper shaft. One end of the first scraper shaft and the second scraper shaft are movably inserted into the adjacent pool end plate, and one end of the first scraper shaft and the second scraper shaft are connected to a cylinder after passing through the adjacent pool end plate.

5. The mud concentration system according to claim 1, characterized in that: The heat exchange module is a shell and tube heat exchanger, including a shell side, a tube side and a cavity cover; the shell side is a heat exchange shell, the left and right ends of the heat exchange shell are respectively connected to the cavity cover, and the upper and lower ends of the heat exchange shell are respectively provided with a flue gas inlet and a flue gas outlet; the tube side is a heat exchange component, and multiple layers of the heat exchange components are fixedly arranged in the heat exchange shell, and the multiple layers of the heat exchange components are sequentially connected end to end through hoses; and one end of the heat exchange component located at the top is connected to the mud inlet, and the other end of the heat exchange component located at the bottom is connected to the mud outlet; and warping pieces are welded on the outside of the heat exchange component.

6. The mud concentration system according to claim 5, characterized in that: The heat exchange assembly includes a heat exchange tube and an end mud collection chamber. Both ends of each layer of the heat exchange tube are respectively connected to an end mud collection chamber. The chamber cover is arranged at one end of the end mud collection chamber away from the heat exchange tube. The flap is welded to the outer wall of the heat exchange tube; the hose is connected to the end mud collection chamber of the heat exchange assembly.

7. The mud concentration system according to claim 6, characterized in that: A plurality of scrapers are arranged in the end mud collection chamber, and the scrapers are fixedly sleeved on a horizontally arranged scraper shaft, the scraper shaft is perpendicular to the length direction of the heat exchange tube, and one end of the scraper shaft passes through the end mud collection chamber and is connected to a cylinder.

8. The mud concentration system according to claim 1, characterized in that: The gas generating module comprises a fan, one end of which is connected to an air inlet via a rotary dehumidifier, and the other end of which is connected to the heat exchange module, so that the dried gas can be passed into the evaporation diffusion channel after heat exchange and temperature increase through the heat exchange module.

9. The mud concentration system according to claim 2, characterized in that: A reciprocating stirring device is provided in the evaporation diffusion channel, and the reciprocating stirring device includes a translation beam, a sliding platform is provided on the inner side of each side plate, the sliding platform is located under the channel cover plate, and a translation beam is slidably provided on the sliding platform; the two translation beams are fixedly connected by a connecting beam; the bottom of the translation beam is connected to the sliding platform in sliding contact through a wear-resistant strip, and a guide groove is provided at the bottom of the translation beam at the positions on both sides of the wear-resistant strip, and two T guide strips are fixedly provided on the sliding platform, and the top of the T guide strip is movably provided on the corresponding In the guide groove, the translation beam is externally connected to a sliding translation driving mechanism; a plurality of rotating wheels are connected between two of the translation beams through bearings, and the rotating wheel includes a rotating wheel shaft, a plurality of rotating wheel hubs are fixedly penetrated on the rotating wheel shaft, and a plurality of blades are arranged between two adjacent rotating wheel hubs; a gear is installed at one end of the rotating wheel shaft, and a rack is fixedly installed at the edge of the side plate close to one end of the gear, and the gear is meshed with the rack; the reciprocating stirring device can drive the rotating wheel to translate while causing the rotating wheel to rotate, and when the translation direction of the rotating wheel is different, the rotation direction of the rotating wheel is opposite.

10. A method for concentrating mud using the mud concentrating system according to any one of claims 1 to 9, characterized in that: The steps include: The slurry heated by the heat exchange module is continuously introduced into the inlet pool. When the height of the slurry in the inlet pool is greater than the channel bottom plate, the slurry flows along the channel bottom plate toward the outlet pool. During the flow, the slurry is heated by the heat exchange module at the channel bottom plate. The blades of the reciprocating stirring device move horizontally and stir the mud in the evaporation diffusion channel, so that the mud does not agglomerate or precipitate; The gas generation module continuously passes the dry gas heated by the heat exchange module into the evaporation diffusion channel from one end close to the slurry outlet pool, forming a counter-flow with the mud and taking away the evaporated water.

Images