Moisture homogenization cooling device

Abstract

The utility model belongs to the field of material cooling, and particularly relates to a moisture homogenizing and cooling device, in the moisture homogenizing and cooling device, when a corresponding material layer is positioned in a fluidized bed layer due to the flow of gas introduced by a gas distribution assembly, the effect of eliminating a feeding cone and material segregation is basically irrelevant to the size and the shape of the cross section of the bed layer; therefore, more than two heat exchangers can be arranged on each layer of heat exchanger assembly without worrying about the influence of non-integral flow and non-uniform particle size distribution caused by the increase of the height of the feeding cone on the cooling uniformity, so that materials with higher capacity can be treated by adopting a smaller height-diameter ratio, or under the condition that the treatment capacity is the same or the cooling depth is the same, the cooling efficiency is improved. And lower equipment height is adopted, so that the plant height or investment or energy consumption increased by secondary lifting of materials is correspondingly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to material cooling field, concretely relates to a moisture homogenization cooling device. BACKGROUND

[0002] Obtaining products through microbial fermentation is one of the main production methods in bio-chemical industry. Because the fermentation broth is complex and contains various organic and inorganic metabolites, various impurities are inevitably contained in the main and by-product obtained by the post-processing of the crude fermentation broth, which leads to the phenomenon of sticking and hardening of the product during storage and transportation, reduces the quality of the product, and increases the cost of transportation and fertilization. The crystalline product produced by fermentation often contains crystal water, has poor stability under pressure or heat, or has hygroscopic properties, so that the mutual fusion phenomenon occurs between the particles during long-term storage, which also easily leads to the same problem.

[0003] Generally, the powder and granular products of fermentation plants need to be dried to the qualified moisture by different forms of dryers, and then cooled to near room temperature by fluidized bed, rotary cylinder and other cooling equipment before packaging. However, for the fluidized bed, rotary cylinder and other cooling equipment, since the air directly contacts the material, the moisture is also transferred from the air to the material while the material is being cooled; or due to incomplete cooling process of the material, heat and moisture still migrate between the inside and surface of the material particles and between the surface of the particles and the surrounding air in the gap after cooling is completed, etc., which eventually leads to caking, hardening and other phenomena. In order to avoid product caking, the current tendency is to reduce the moisture content of the product to far below the equilibrium moisture under ambient conditions in the drying link, and based on the characteristics of the fermentation product being easy to absorb moisture, the ambient air, especially the ambient air in the hot and humid season, is used as the coolant, which will also enter the material while the material is being cooled, resulting in moisture absorption of the material; there are certain gaps between the particles of bulk materials, and the humid air filling the gaps will enter the closed environment of the packaging bag, and the moisture absorption process on the surface of the particles will also cause further adhesion of the particles; and if the temperature of the packaged material is higher than the ambient temperature, the moisture in the particles will continue to migrate to the surface and be continuously released into the gap during the continuous heat dissipation process of the material to the environment, which will also continue to increase the humidity of the air, and further cause the adhesion between the particles. Therefore, for the equipment that directly contacts the material with air for cooling, the air needs to be deeply dehumidified to avoid moisture absorption of the material during the cooling process, and the air in the gap of the material particles is replaced with dry air; due to the efficiency problem of the cooling equipment, in order to cool the material to the ambient temperature (such as to below 25-35℃ in summer), a lower inlet air temperature and a lower relative humidity at the inlet air temperature (such as: dry bulb temperature 20℃, relative humidity 20%) are required, but the air is humid in summer and autumn, and the energy consumption of the dehumidification and cooling link is relatively large, sometimes even accounting for more than 20-30% of the energy consumption of the drying process. And during the cooling process, the particles are in a state of intense motion, and the friction between the particles and the wall surface of the cooling equipment will cause the abrasion of the particles, and the new dust generated by the friction will enter the product, which reduces the product quality and increases the degree of product caking.

[0004] In recent years, in the chemical fertilizer industry, especially in the urea industry, the indirect heat transfer cooling device for bulk solid material has been introduced from the international market. Compared with the fluidized bed cooler, it has obvious technical advantages in energy saving, emission reduction, and cooling depth. The main body of the cooling device is a vertically arranged container, which is divided into a feeding section, a cooling section, and a discharging section from top to bottom. The cooling section is provided with a heat exchanger. The free-flowing solid particles enter the container from the inlet of the feeding section and slowly move downward under the action of gravity. When flowing through the cooling section, the heat is taken away by the coolant in the heat exchanger, and the material is cooled to the required temperature, and then enters the discharge section shell and is discharged from the outlet thereof. Since the material is in a slow overall flow state during the cooling process, the friction between the particles and the wall surface is small, and the particle wear is basically eliminated. And since it is an indirect heat transfer method, the material is basically not in contact with the air, avoiding the increase of the water content of the product during the cooling process.

[0005] However, when dealing with powdery products of fermentation plants, whether it is a crystalline product or a granular product formed by drying a blending liquid with multiple components, there are some common problems when using a gravity flow type cooler for cooling:

[0006] (1) The material is easy to scab on the heat exchange wall of the heat exchanger after absorbing moisture, especially the wall of the heat exchanger located above the gravity flow type cooler, which will cause a significant decrease in heat exchange effect, and even cause partial material flow passage obstruction. In addition, the material itself will also appear to be clumped after absorbing moisture.

[0007] (2) In the gravity flow type cooler, it is always expected that the material flows downward at a uniform speed throughout the cross section of the cooler, i.e. in the so-called overall flow manner, so as to obtain the best cooling effect. However, the actual application situation is not always ideal, especially for materials that are easy to absorb moisture, clump, and scab. The clumping and scabbing of the material aggravate the unevenness of the overall flow of the material, making the cooling degree of the material in different areas of different cross sections of the cooling equipment differ more, which leads to the fact that part of the material is still at a high temperature, even if the average temperature of the discharged material meets the requirements. These materials may still appear to be clumped during long-term storage.

[0008] Based on the above reasons, in order to ensure uniform and consistent deep cooling effect, a larger height-diameter ratio needs to be used, which leads to a higher height of the heat exchanger. For large-scale equipment, it often penetrates two or three floors, which requires additional feeding lifting or discharging lifting equipment, or the upstream equipment to be arranged at a higher position, thereby increasing the investment in equipment and plant. Practical new type content

[0009] The utility model discloses a main purpose is to provide a kind of moisture homogenization cooling device, by being set material fluidization section on the upper section of heavy cooler body, material in material fluidization section is in flow state, eliminate the material caused by material pile caused by uneven distribution of particle and material segregation, can guarantee that material is in horizontal direction, i. E. the uniform distribution of particle size in the cross section direction of heavy cooler body, and make material in the same drying degree gas environment, guarantee the moisture of material everywhere is uniform, avoid material moisture absorption scarring, so that two or more heat exchangers can be arranged in each layer of heat exchanger component, and then larger cross-sectional area cooling device can be used to cool material.

[0010] The utility model discloses a technical problem to be solved adopts following technical scheme to realize: a kind of moisture homogenization cooling device, including heavy cooler body, gas distribution component, heat exchanger component, gas supply system and heat exchange medium supply system;

[0011] The heat exchanger component is plate heat exchanger or tubular heat exchanger, first material passage is provided between the heat exchange plate of heat exchanger component or between heat exchange pipe and is penetrated from top to bottom;

[0012] The gas distribution component is horizontally arranged in heavy cooler body, including air distribution unit and second material passage between air distribution unit, which are distributed along the cross section of heavy cooler body;

[0013] The heavy cooler body is vertical casing, the heavy cooler body top is provided with inlet and exhaust port, and the heavy cooler body bottom is provided with discharge port;

[0014] The heavy cooler body is provided with material fluidization section and gravity cooling section from top to bottom;

[0015] The material fluidization section is provided with gas distribution component connected with gas supply system;

[0016] The gas distribution component is used to introduce dry gas into heavy cooler body, so that the material in material fluidization section is in flow state, and the material entering material fluidization section is spread in horizontal direction, to ensure that the material is uniformly distributed, and the moisture in the gap between materials is fully replaced and discharged into gravity cooling section;

[0017] The gravity cooling section is provided with at least one layer of heat exchanger component connected with heat exchange medium supply system, and each layer of heat exchanger component includes two or more heat exchangers;

[0018] The heat exchange medium supply system is used to provide refrigerant to the heat exchanger assembly. The material layer in the fluidized state can effectively eliminate the feed material cone, make the bed material surface tend to the same level, and eliminate the feed segregation phenomenon; the dry gas can more effectively remove the wet hot gas in the gap between the material particles when the material is in the fluidized state, so that the replaced material is in a uniform and consistent dry gas environment, and the dew point temperature is much lower than the refrigerant temperature, so that a lower temperature refrigerant can be used to cool the material to improve the cooling efficiency; the high mass transfer rate in the fluidized state can also replace the gas in the capillary pores on the particle surface to some extent, so that the moisture in the material is further carried out, and the effect of deep drying and cooling is achieved.

[0019] The dry gas introduced is preferably dry cold gas, which has the effect of cooling the material while replacing the dry gas, further improving the cooling efficiency; the dry gas is a gas after removing moisture, and the dry cold gas is obtained by cooling the dry gas.

[0020] When the gas distribution assembly of the material fluidization section works independently, the fluidization air speed generated by the ventilation volume of the gas distribution assembly in the material fluidization section is 1-6 times the critical fluidization speed calculated according to the average particle size of the material. That is, the fluidization number (the ratio of the fluidization air speed to the critical fluidization speed calculated according to the average particle size of the material) of the material in the material fluidization section is between 1-6, so that the material is in a sufficient and uniform fluidization state, the moisture steam contained in the gas in the void of the material is carried out, and the situation that the material flow is blocked in the local area is avoided.

[0021] The fluidization air speed mentioned above refers to the operating air speed when the material is in the fluidization state, and in this patent, it specifically refers to the operating air speed formed by the total air volume passing through the cross section according to the horizontal net cross-sectional area of the material fluidization section.

[0022] In the utility model, the selection of the fluidization air volume should make the lower limit of the fluidization air speed not less than the critical fluidization speed calculated according to the average particle size of the material. Specifically, the lower limit of the fluidization air speed is the minimum operating air speed for ensuring that the material is in the fluidization state to carry out sufficient loosening, flowing, mutual mixing and other movements, so as to eliminate the feed cone, make the upper surface of the material layer generally at the same level, and make the material layer generally in the fluidization boiling state, thereby avoiding the local material flow blockage. The upper limit of the fluidization air speed is the maximum air speed for maintaining the stable fluidization of the material layer and avoiding excessive entrainment. The upper limit of the operating air speed of the general fluidized bed can be considered.

[0023] From the point of view of eliminating the feed cone by putting the material into a fluidized, flowing state, this can be achieved in a range from low to high operating air velocity approaching the critical fluidization velocity (for example, for a 70% lysine granulation product, the feed cone is substantially eliminated at an operating air velocity of 0.7 to 1 times the critical fluidization velocity calculated using the average particle size). However, this partial, incomplete fluidization does not meet the requirements of the present patent. Because most industrial products have a certain range of particle size distribution, the average particle size is used to calculate the critical fluidization velocity in engineering, and the range of the operating air velocity (i.e., the actual value of the air velocity during production operation) is determined accordingly. In the present patent, when the operating air velocity is determined according to the average particle size, for materials with a wide particle size distribution, when the fluidization number is below 1 but close to 1, a small portion of the material below the average particle size is already in a bubbling fluidization state, while the larger particles are still in a stationary state. This partial fluidization region is randomly distributed throughout the cross-section of the tank. In the feed cone region at the top of the material layer, due to the upward movement of bubbles and flowing particles, the material pile itself can basically eliminate the feed cone under the action of its own gravity, achieving the goal of making the bed level. However, due to the short circuit of air flow caused by this so-called "partial fluidization" or "semi-fluidization", the local material flow blockage, and the uneven distribution of air distribution holes (only distributed at the gas distribution pipe, and the material flow channel between the gas distribution pipe), the moisture in the unfluidized region is more difficult to remove. The presence of material moisture absorption and caking characteristics makes the material in the unfluidized region more prone to moisture absorption, caking or scarring. Therefore, in the present utility model, it is not desirable to have an operating air velocity below the critical fluidization velocity calculated using the average particle size.

[0024] The spacing distance of the gas distribution pipes of the gas distribution assembly, the number, shape and spacing distance of the air distribution holes, and the opening rate of the air distribution holes (i.e., the ratio of the opening area to the area of the cross-section of the tank where the gas distribution pipes are located) are specially designed according to the required ventilation volume, the shape of the cross-section of the tank or the distribution of the feed inlet, etc., to ensure that the gas is evenly distributed throughout the cross-section of the tank, and at the same time, the material moves smoothly from the material flow channel between the gas distribution pipes downward.

[0025] The utility model discloses further, still include setting in gravity cooling section and with the gas distribution assembly of air supply system connection, the gas distribution assembly is used to the dry gas of going into heavy cooler body, make the material of gravity cooling section present aerated state, make the material layer at aerated state and carry out replacement to the gas in the gap between particle, take away the moisture of evaporation (volatilization) in gas and particle, reduce the relative humidity and dew point temperature of the gas environment where particle is at, can adopt lower temperature refrigerant to cool material accordingly;Material in aerated state can keep good fluidity, make material in corresponding cooling section be in integral flow state;Dry gas preferably dry cold gas, improve the cooling efficiency simultaneously to the effect of cooling material, therefore, the gas of gas distribution assembly going into in gravity cooling section is replacement air.

[0026] The ventilation quantity or the sum of ventilation quantity of the gas distribution assembly in the gravity cooling section generates the operating wind speed of passing through the cross section average wind speed according to the horizontal net cross section area of the gravity cooling section, and the operating wind speed is 0-0.5 times of the critical fluidization speed calculated according to the average particle size of material.

[0027] When the gas distribution assembly in the material fluidization section and the gas distribution assembly in the gravity cooling section work simultaneously, the fluidization wind speed generated when the ventilation quantity of the gas distribution assembly in the material fluidization section is calculated separately is not less than 0.7 times of the critical fluidization speed calculated according to the average particle size of material, and the fluidization wind speed generated when the sum of the ventilation quantity of the gas distribution assembly in the material fluidization section and the gas distribution assembly in the gravity cooling section is not less than 1.2 times of the critical fluidization speed calculated according to the average particle size of material.

[0028] After material passes the upper fluidization section, most of the humid gas has been replaced from the material gap, and is in the relatively dry gas environment, at this time, only a small amount of dry gas is introduced into the heavy cooler body through the gas distribution assembly in the gravity cooling section, and the small amount of moisture volatilized from the material is taken out;When selecting a plurality of dry gases with different dryness degrees, the lower gas distribution assembly can select the gas that is drier than the dry gas introduced by the upper gas distribution assembly, to further reduce the dew point of the gas environment of the material gap, and correspondingly, a lower temperature refrigerant can be used. The dry gas introduced takes out the moisture vapor, and also improves the fluidity of the material.

[0029] The maximum operating air speed generated by the air volume or the sum of the air volume in the gravity cooling section is as low as possible when meeting the operating requirements, and the fluidization number is between 0 and 0.5, which is the best. On the one hand, when the air speed is low, the resistance of the gas passing through the material layer is low, and the power consumption of the gas pressurization is small. On the other hand, when the operating air speed is close to the critical fluidization air speed, the so-called "local fluidization" or "semi-fluidization" phenomenon occurs, causing gas short circuiting and other defects, which exacerbates the gravity flow blockage in the unfluidized area, thereby reducing the cooling effect.

[0030] Each layer of the heat exchanger assembly is provided below with a layer of gas distribution assembly, and each layer of the gas distribution assembly includes one or more gas distribution assemblies. A plurality of layers of heat exchanger assemblies are provided from top to bottom in the gravity cooling section, and a layer of gas distribution assembly is provided below each layer of heat exchanger assembly, which has the following technical significance:

[0031] a. During the start-up stage, a certain amount of "bottom material" is required to completely bury the heat exchanger assembly in the material layer to enable normal production. During the process of feeding "bottom material", the discharge device is in a stopped or slow discharge state. As the feeding process proceeds, the material layer gradually rises. When the material layer is within the height range of the bottommost heat exchanger assembly, the gas distribution assembly below it is turned on. When the material layer rises to the height range of the second-to-last heat exchanger assembly, the second-to-last gas distribution assembly is turned on, and the second-to-last gas distribution assembly is turned off or turned down. In this way, when the material reaches the running material level, the highest gas distribution assembly is turned on, and the system enters normal operation. This operation ensures that the moisture in the material is fully and reliably replaced by dry gas during the start-up to stable operation period.

[0032] b. During the shutdown stage, the opposite sequence is adopted, and the lower gas distribution assemblies are turned on and the higher gas distribution assemblies are turned off as the material layer decreases. This operation ensures that the moisture in the material is fully and reliably replaced by dry gas during the shutdown period.

[0033] c. In normal production, one, multiple or all gas distribution assemblies can be selected to be turned on according to the material properties and operating requirements. For example, for some materials, a small amount of moisture may still evaporate when the temperature in the upper region of the cooling section is high, and evaporation stops when the temperature in the middle and lower regions of the cooling section is low. In this case, the upper gas distribution assemblies should be turned on without turning on the lower gas distribution assemblies. For some materials, it is necessary to cool to a very low temperature, and it is necessary to supplement more dry gas to adapt to the lower temperature coolant. In this case, only the lower gas distribution assemblies can be turned on. For some materials with poor flowability, the appropriate aeration state should be maintained throughout the cooling process to increase the flowability. In this case, all the gas distribution assemblies can be turned on to pass a small amount of dry gas.

[0034] When the groups of gas distribution assemblies are turned on, the replacement air volume of the cooling section at the upper position is the sum of the air volumes of all the groups of gas distribution assemblies that are turned on at the lower position, and the fluidization air volume of the material fluidization section is the sum of the air volumes of all the groups of gas distribution assemblies that are turned on at the upper position.

[0035] d. In practical applications, for materials with less obvious moisture absorption and scabbing characteristics, the gas distribution assemblies (including the gas distribution assemblies in the material fluidization section and the gravity cooling section) from top to bottom can be sequentially connected to different drying degrees of gas, as long as the dew point temperature is lower than the inlet temperature of the coolant of the cooling section at the position by a certain degree, so as to further save the energy consumption and equipment cost for gas dehumidification. The drying degree of the dry gas should ensure that the wall surface of the heat exchanger assembly where the coolant at the lowest temperature of the cooling section of the layer is located does not produce condensation, and at the same time, ensure that the material does not appear moisture absorption, caking or scabbing when being cooled by the wall surface of the heat exchanger assembly where the coolant at the lowest temperature is located.

[0036] The utility model discloses preferably, each layer heat exchanger assembly sets up a row of heat exchanger or a column of heat exchanger, the heat exchanger is arranged along the length direction of the cross section of heavy cooler body or is arranged along the width direction of the cross section of heavy cooler body. Through the interval arrangement of multiple heat exchangers along the length direction of the cross section of heavy cooler body or along the width direction of the cross section of heavy cooler body, the cross section area of heavy cooler body is increased, and the installation of heat exchanger assembly is facilitated from one side of heavy cooler body.

[0037] The utility model discloses preferably, each layer heat exchanger assembly sets up two rows of heat exchanger or two columns of heat exchanger, the heat exchanger is arranged along the length direction of the cross section of heavy cooler body or is arranged along the width direction of the cross section of heavy cooler body. Through the interval arrangement of multiple heat exchangers along the length direction of the cross section of heavy cooler body or along the width direction of the cross section of heavy cooler body, the cross section area of heavy cooler body is increased, and the installation and maintenance of heat exchanger assembly are facilitated from two sides of heavy cooler body.

[0038] The utility model discloses preferably, the material fluidization section is provided with the heat exchanger assembly that is connected with heat exchange medium supply system;

[0039] The heat exchange medium supply system is used for providing coolant for the heat exchanger assembly in the material fluidization section. By arranging the heat exchanger assembly in the material fluidization section, the heat exchanger assembly and the material in the fluidization state can be heat exchanged, so that the heat transfer coefficient can be significantly improved, and the cooling efficiency can be improved. In addition, by making the material in the fluidization state, the wall surface of the heat exchanger assembly can be continuously scoured by the material, so that the surface scabbing of the top heat exchanger assembly is further avoided, and the heat exchange efficiency is improved.

[0040] The utility model discloses preferably, the lower layer every heat exchanger below is provided with a inverted cone discharge section and a discharge port, the discharge port is set up at the bottom of inverted cone discharge section. When the length or / and width direction of the re-cooler is enlarged, if the discharge section of single cone hopper form is used, the re-cooler box connected with it can appear the condition that the middle region of cross section moves down fast and the periphery is slow, in order to avoid the damage of single cone hopper discharge section to the overall flow of material, the combination mode of multiple discharge ports, i. e. setting multiple cone hoppers is used, and the number and arrangement mode of cone hoppers correspond to the arrangement mode of heat exchanger assembly. Preferably, a inverted cone discharge section with the same cross section size is arranged below every heat exchanger of the lowermost heat exchanger assembly, because the number and arrangement mode of heat exchanger of each layer of the re-cooler body in the vertical direction are same, and each heat exchanger of each layer forms a whole through cooling channel from top to bottom, the material flow channel of downward flowing material and the gas flow channel of upward flowing material in the channel have the axial symmetry characteristics of consistent in the vertical direction and having horizontal or vertical direction in the cross section, and it is easier to form the whole flow unit consistent in the vertical direction, thereby better guaranteeing that the whole flow in the re-cooler body with wide cross section area is stable. The design of multiple cone hoppers also helps to reduce the height of inverted cone discharge section.

[0041] The utility model discloses preferably, still including adjustable flow's discharger and material level meter, and each discharge port shares a discharger or is provided with a discharger every discharge port;

[0042] The material level meter is arranged at the top of the re-cooler body and is used for measuring the material level height of the material in the re-cooler body.

[0043] The discharger is connected with the discharge port and is used for adjusting the discharging speed of the material to control the material level height of the material in the re-cooler body. The discharger is used for controlling the uniform discharging of the material, adjusting the flow, and controlling the discharging flow of the discharger through the material level electric signal of the material level meter to control the material level height of the material in the re-cooler body, guaranteeing the fluidized material layer to maintain stable fluidization, making the material bury all heat exchanger assemblies, guaranteeing the heat exchange efficiency, achieving the effect of high-efficiency drying, and effectively removing the moisture in the material.

[0044] The utility model discloses preferably, the material fluidization section top is provided with expansion section, to reduce the ascending speed of tail gas, reduce the dust entrainment in tail gas.

[0045] The utility model discloses preferably, the material passageway of upper and lower two layers of heat exchanger subassembly is parallelly arranged, and the material passageway of upper and lower two layers of heat exchanger subassembly is staggered in horizontal direction each other. That is, the extension direction of the heat exchange tube or the heat exchange plate of each layer heat exchanger subassembly is same in horizontal direction, and the heat exchange tube or the heat exchange plate of upper and lower adjacent is staggered arrangement in vertical direction, and this arrangement can make the material flowing down in the flow channel formed between the adjacent heat exchange tube or the adjacent heat exchange plate of the last layer heat exchanger subassembly, when entering the next layer heat exchanger subassembly, be distributed to two adjacent material passageways, thereby increasing the transverse movement of material, breaking the slight adhesion phenomenon between materials, increasing the mixing of materials between different temperatures, and improving the uniformity of material temperature.

[0046] The utility model discloses preferably, the heat exchanger subassembly can be set in the heavy cooler body in pullable, when the heat exchanger subassembly is the tubular heat exchanger, the heat exchanger subassembly includes a plurality of interval, the heat exchange tube of basically parallel for cooling the granular material, and the heat exchange tube is fixed through the partition and panel and is combined into an independent heat exchanger subassembly, and the heat exchanger subassembly whole can be set in the heavy cooler body in horizontal sliding, and the heat exchanger subassembly is fixed on the heavy cooler body through the fixed part (not expressed in the drawing), wherein the panel is used as fixed flange and is connected with the heavy cooler body through sealing washer, bolt etc., and the heat exchanger subassembly can be conveniently pulled out and installed from the lateral surface of the heavy cooler body in overhaul,

[0047] Or, the heavy cooler body on the heat exchanger subassembly is provided with the maintenance door to facilitate the overhaul of the heat exchanger subassembly. When the heat exchanger subassembly is the plate heat exchanger, the heat exchanger subassembly includes a plurality of vertical arrangement, interval, the heat exchange plate of basically parallel for cooling the granular material, and a plurality of heat exchange plates are fixed at a certain distance through the fixed plate fixed on the heavy cooler body and are combined into an independent heat exchanger subassembly, and the horizontal first connecting pipe is connected from the upper portion and lower portion of the heat exchange plate, and is directly connected with the inlet distribution header or the outlet distribution header after extending to the outside of the heavy cooler body or through the hose, and the maintenance door is opened on the other side opposite the shell side of the distribution header (including the inlet distribution header and the outlet distribution header), and each heat exchange plate can be pulled out and installed from the shell side of the heavy cooler body in overhaul.

[0048] The utility model discloses preferably, the heat exchanger subassembly of material fluidization section is the tubular heat exchanger. The material of material fluidization section is in the fluidization state, can better overcome the phenomenon that the material deposits on the upper portion of heat exchange tube, and the disturbance of heat exchange tube to material in the fluidization state is bigger than the plate heat exchanger, thereby having better heat transfer effect.

[0049] The utility model discloses preferred, the heat exchanger assembly includes a plurality of interval arrangement in horizontal direction heat exchange pipe, the heat exchange pipe is the serpentine pipe of up and down extension, compared with horizontal arrangement serpentine pipe, up and down arrangement serpentine pipe is favorable to form the material flow channel of up and down through, reduces the resistance of material down flow, and the countercurrent or parallel flow heat exchange is formed between material and refrigerant, instead of cross flow heat exchange, and heat exchange efficiency is higher, and material in the same horizontal section is not easy to appear temperature difference on different positions.

[0050] Further preferred, the two adjacent serpentine heat exchange pipes are arranged in staggered manner up and down. The two adjacent serpentine heat exchange pipes are arranged in staggered manner up and down, which increases the number of material distribution and convergence in the flow channel, increases the disturbance on the material side, and can increase the heat transfer coefficient on the material side; meanwhile, the flow of material is increased, which also helps to reduce the slight adhesion phenomenon of material.

[0051] The utility model discloses preferred, the air distribution unit includes gas distribution pipe, the air distribution pipe below is provided with air distribution hole;

[0052] The air distribution holes are arranged in rows and spaced apart from each other along the axial direction of the gas distribution pipe, and at least one row of air distribution holes is arranged below each gas distribution pipe. By opening more than one row of air distribution holes in the lower half of each gas distribution pipe along the axial direction, the gas in the pipe can be sent to the material channel inside the heavy cooler body box. The arrangement of the gas distribution pipe and the opening mode of the pipe wall can ensure that the gas is uniformly distributed to the entire cross section of the heavy cooler body shell and passes through the material layer upward. The cross-sectional shape of the gas distribution pipe can be circular, oval, rhombus, oblong, or other shapes. The shape of the air distribution hole is not necessarily circular, but can be a strip-shaped gap.

[0053] Preferably, the gas distribution pipe is a straight pipe.

[0054] Preferably, the gas distribution pipe is perpendicular to the heat exchange pipe in the heat exchanger assembly, or the gas distribution pipe is perpendicular to the heat exchange plate in the heat exchanger assembly, i.e., the extension direction of the gas distribution pipe in the horizontal direction is perpendicular to the extension direction of the heat exchange pipe or the heat exchange plate in the horizontal direction. The perpendicular arrangement of the extension direction of the gas distribution pipe in the horizontal direction and the extension direction of the heat exchange pipe or the heat exchange plate in the horizontal direction is beneficial to the more uniform distribution of gas in the heat exchange pipe or heat exchange plate area, avoiding local airflow shortage and causing material fluidization difficulty or local blockage.

[0055] Preferably, the opening rate of the gas distribution assembly in the material fluidization section is greater than the opening rate of the gas distribution assembly in the gravitational cooling section.

[0056] Preferably, the uppermost gas distribution assembly has a higher open area ratio at the openings below the feed inlet than at other locations. The distribution of the gas distribution pipes of the gas distribution assembly can be adjusted, such as to be denser and the openings to be larger in the region of the gas distribution pipes corresponding to the tip region of the material cone near the feed inlet, so that the material in the corresponding tip region is loosened (or flows) more vigorously even in an insufficiently fluidized state, and slides downward under the action of gravity from the high point, thereby eliminating the material cone and making the material layer region substantially horizontal.

[0057] The working principle of the utility model is:

[0058] By blowing dry gas into the shell of the heavy cooler body through the gas distribution header, the material above the gas distribution pipe is in a fluidized state, and the following pretreatment is performed on the material from the drying process by using the characteristics of gas-solid fluidization:

[0059] a. Eliminate the segregation phenomenon of the feed cone and the feeding process, and make the material uniformly distributed in the cross section of the heavy cooler body.

[0060] In theory, it is always desirable for the material to move downward in the box of the gravity cooler (hereinafter referred to as the heavy cooler) in a bulk flow manner, so that the material on the entire cross section experiences the same cooling process for the same time, thereby obtaining uniform and consistent cooling depth. However, the actual powder or granular material always has a certain particle size distribution range, when the material freely falls from the feed inlet to the stationary heat exchanger assembly or the upper part of the material at a certain speed, a conical material accumulation area, i.e. the feed cone, is formed; after the formation of the feed cone, the subsequent particles will appear the phenomenon of segregation, i.e. the large particle size material is enriched in the periphery of the cone, and the small particle size and powder material is enriched in the center, the weight of the feed cone and the impact force of the feed form uneven pressure on the material below, causing the material in the center region of the feed cone to move downward faster and the material around to move downward slowly, affecting the uniformity of the bulk flow of the material, thereby causing differences in the cooling depth of the material in different box cross section regions. Since the material in the heavy cooler moves downward in a bulk flow manner and has the same cooling time, when segregation occurs, the material particle size distribution will be uneven on the cross section of the heavy cooler body box, and the cooling speed of coarse particles is slower than that of fine particles, which will cause the temperature of the material around the feed cone to be higher than that of the material in the center region, thereby exacerbating the cooling temperature difference.

[0061] The utility model discloses a heavy cooler body is provided with material fluidization section on the top, under the fluidization state, material has the characteristic similar to fluid, and the feeding cone is automatically eliminated, forms a horizontal fluidization bed layer upper surface, thereby makes the uniformity of material pressure on the whole cross section of heavy cooler body, is favorable to the overall flow of material from top to bottom in the gravity cooling section box, increases the uniformity of material cooling time in each place of the cross section of heavy cooler body, further, under the fluidization state, the particle size distribution of material is uniform in the horizontal direction, and there is no segregation phenomenon of material, thereby guaranteeing that material enters the subsequent cooling process with the uniform particle size distribution, and eliminating the uneven cooling condition caused by the different particle size distribution of material.

[0062] b. the wet hot gas in the material particle gap is replaced efficiently, and the material is pre-cooled and moisture homogenization treated.

[0063] The powder or granular material has certain porosity, and the particle gap of the material is usually filled with wet hot gas after drying treatment, which can be common air or inert gas such as nitrogen, and the moisture can be common water vapor or steam of other volatile components such as methanol steam. The relative humidity of the moisture in the gas is very low at high temperature, but the relative humidity becomes larger after cooling, and the particles are more easily absorbed, thereby increasing the moisture in the particles, that is, the material absorbs moisture. When the temperature of the humid gas is reduced to below the dew point temperature of the moisture, the humid gas is more likely to condense on the particle surface and the heat exchanger wall, especially when the temperature of the heat exchanger wall and the surrounding area is very low, the humid gas is more likely to condense, directly causing the material to be blocked or the heat exchanger wall to be scabbed. Therefore, the moisture in the humid hot gas must be replaced for the moisture-absorbing material, so that the material is in a dry gas environment, and the fluidization gas can play such a role.

[0064] Further, under the fluidization state, the contact efficiency of the particles and the fluidization gas is very high, and the gas around each particle can be replaced sufficiently; the high mass transfer rate under the fluidization state can also replace the gas in the capillary pores on the surface of the particles to a certain extent; and the heat transfer efficiency is also very high, thereby fully utilizing the heat energy of the low-temperature fluidization gas to reduce the temperature of the material, eliminating the temperature and moisture difference between the particles with different moisture content and different particle size, and achieving better cooling and moisture homogenization effect.

[0065] Compared with the prior art, the beneficial effects of this utility model are as follows: When the gas flow rate introduced by the gas distribution component in this utility model makes the corresponding material layer a fluidized bed, its effect of eliminating feed cone and material segregation is basically independent of the cross-sectional size and shape of the bed. Therefore, a larger cross-sectional area can be used, a larger heat exchanger assembly can be placed, or more than two heat exchangers can be set in each heat exchanger assembly without worrying about the impact of non-overall flow and uneven particle size distribution on cooling uniformity caused by the increase in feed cone height. Thus, a smaller height-to-diameter ratio (for rectangular shells, it can be described as height-to-width ratio or height-to-length ratio, or height-to-cross-sectional area ratio) can be used to obtain a larger material handling capacity. Alternatively, with the same handling capacity, i.e. material quantity, or the same material cooling temperature difference, a lower equipment height can be used, which correspondingly reduces the plant height or the secondary lifting height of the material, thereby reducing the increased investment or energy consumption. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of the water homogenization cooling device described in Embodiment 1 of this utility model;

[0067] Figure 2 This is a schematic diagram of the moisture homogenization cooling device described in Embodiment 2 of this utility model;

[0068] Figure 3 This is a schematic diagram of the cross-sectional arrangement of the gas distribution components and heat exchanger components in the embodiment.

[0069] Figure 4 This is a schematic diagram of the gas distribution component in the longitudinal section of the embodiment;

[0070] Figure 5 This is a schematic diagram of the cross-sectional structure of the gas distribution component in the embodiment;

[0071] Figure 6 This is a schematic diagram of the air distribution hole structure in an embodiment of this utility model;

[0072] Figure 7 This is a schematic diagram of the arrangement of the gas distribution assembly and heat exchanger assembly described in Example 1. Figure 1 ;

[0073] Figure 8 This is a schematic diagram of the outlet layout described in Example 1. Figure 1 ;

[0074] Figure 9 This is a schematic diagram of the arrangement of the gas distribution assembly and heat exchanger assembly described in Example 1. Figure 2 ;

[0075] Figure 10 This is a schematic diagram of the outlet layout described in Example 1. Figure 2 ;

[0076] Figure 11 Schematic diagram of arrangement structure of gas distribution assembly and heat exchanger assembly according to example 3 Figure 1 ;

[0077] Figure 12 Schematic diagram of arrangement structure of gas distribution assembly and heat exchanger assembly according to example 3 Figure 1 ;

[0078] Figure 13 Schematic diagram of arrangement structure of gas distribution assembly and heat exchanger assembly according to example 3 Figure 2 ;

[0079] Figure 14 Schematic diagram of arrangement structure of gas distribution assembly and heat exchanger assembly according to example 3 Figure 2 ;

[0080] Figure 15 Schematic diagram of arrangement structure of staggered arrangement of upper and lower adjacent tube heat exchangers;

[0081] Figure 16 Schematic diagram of arrangement structure of staggered arrangement of upper and lower adjacent plate heat exchangers;

[0082] Figure 17 Schematic diagram of arrangement structure of tube heat exchanger;

[0083] Figure 18 Schematic diagram of arrangement structure of plate heat exchanger;

[0084] Figure 19 Schematic diagram of arrangement structure of heat exchanger series connection in example 2 of the utility model;

[0085] In the drawing, 1 is a heavy cooler body, 2 is a gas distribution assembly, 3 is a heat exchanger assembly, 31 is a heat exchanger, 32 is a heat exchange tube, and 33 is a heat exchange plate.

[0086] 1000 is a first material channel, 2000 is a wind distribution unit, and 3000 is a second material channel.

[0087] 101 is a feeding port, 102 is an exhaust port, 103 is a discharging port, 104 is a material layer upper surface, 105 is a feeding material flow, and 106 is a discharging material flow.

[0088] 100 is a material fluidization section, 200 is a gravity cooling section, 300 is a cooling channel, and 400 is an expansion section.

[0089] 4 is an inverted conical discharging section, 5 is a discharger, 6 is an auxiliary discharging device, 7 is an inspection door, 8 is a gas distribution pipe, 81 is a wind distribution hole, 9 is a material level meter.

[0090] 500 is an inlet distribution main pipe, 600 is an outlet distribution main pipe, 700 is a first connecting pipe, 800 is a gas distribution main pipe, and 900 is a second connecting pipe.

[0091] 301 Panel, 302 Sealing Gasket, 303 Partition. Detailed Implementation

[0092] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0093] In this invention, the net cross-section is defined as the cross-sectional area of ​​the material channel after deducting the cross-sectional area occupied by the heat exchanger assembly on any horizontal cross-section of the box where the bed or gravity cooling section is located.

[0094] The critical fluidization velocity was calculated according to the formula given on page 166 of "Fluidized Drying Technology and Equipment" published by Science Press in 1996, authored by Tong Jingshan.

[0095] Example 1

[0096] like Figure 1 As shown, a moisture homogenization cooling device includes a recooler body 1, a gas distribution component 2, a heat exchanger component 3, a gas supply system, and a heat exchange medium supply system (the gas supply system and the heat exchange medium supply system are not shown in the figure).

[0097] like Figure 1 As shown, the recooler body 1 is a vertical shell. The top of the recooler body 1 is provided with a feed inlet 101 and an exhaust outlet 102, and the bottom of the recooler body 1 is provided with a discharge outlet 103.

[0098] Specifically, the heavy-duty cooler body 1 is provided from top to bottom with a material fluidization section 100, a gravity cooling section 200, and a discharge section. The upper half of the fluidization drying section is also the feeding section. The feeding section typically has a shell with a rectangular cross-section that is uniform from top to bottom. The top of the feeding section shell is provided with one or more feed ports 101 for adding the powdery or granular material to be processed, such as... Figure 1 As shown, a feed flow 105 is formed; the top of the feed section shell is provided with one or more exhaust ports 102 for venting gas; the internal space of the feed section shell is used to accommodate material, which usually fills part of the shell during operation, and under fluidization, has a distinct upper surface 104 of the material layer, with a certain height of space above the material, where small particles entrained in the exhaust gas re-sink to the material layer under gravity; the bottom of the feed section shell is open, usually equal to the cross-section of the feed section shell, for connecting to the feed end of the material fluidization section 100, or the feed section itself is the upper half of the material fluidization section 100, that is, there is a certain amount of remaining space above the upper surface of the material layer in the material fluidization section 100. A level gauge 9 is installed on the feed section shell to measure the material level height and transmit it electrically to the control system.

[0099] like Figure 1As shown, the heavy cooler body 1 is provided with a material fluidization section 100 and a gravity cooling section 200 from top to bottom.

[0100] The material fluidization section 100 is provided with a gas distribution assembly 2 connected with the gas supply system.

[0101] The gas distribution assembly 2 is connected with the gas supply system, and is used for introducing dry gas into the heavy cooler body 1, so that the material in the material fluidization section 100 is in a fluidization state, the material entering the material fluidization section 100 is spread in the horizontal direction, the bed layer material surface tends to be the same level, and the moisture in the material gap is fully replaced and discharged before entering the gravity cooling section 200. The fluidization characteristics similar to liquid can make the material uniformly spread horizontally, the high heat and mass transfer characteristics of fluidization can fully replace the moisture, and the moisture of coarse and fine particles is uniform, which cannot be achieved when the material is not in a fluidization state.

[0102] In the embodiment, the heat exchanger assembly 3 is a plate heat exchanger or a tube heat exchanger, and the heat exchange tubes in the tube heat exchanger are arranged at intervals, and the heat exchange plates in the plate heat exchanger are arranged at intervals. The first material passage 1000 is arranged between the heat exchange plates 33 or the heat exchange tubes 32 of the heat exchanger assembly 3 and penetrates up and down. The gap between the heat exchange tubes in the tube heat exchanger and the gap between the heat exchange plates in the plate heat exchanger are the first material passage 1000. The outer space of the heat exchanger assembly 3 is a material passage, and the inner space is a refrigerant fluid passage, and the two are separated by the heat exchange wall of the heat exchanger assembly 3, and heat is transferred through the wall.

[0103] As shown in the drawings, Figure 1 In the embodiment, the gas distribution assembly 2 arranged in the material fluidization section 100 is located at the bottom of the fluidization section and the upper region of the uppermost heat exchanger assembly 3 of the gravity cooling section. As shown in the drawings, Figure 3 The gas distribution assembly 2 is horizontally arranged in the heavy cooler body 1 and includes air distribution units 2000 arranged at intervals along the cross section of the heavy cooler body 1 and second material passages 3000 located between the air distribution units 2000.

[0104] As shown in the drawings, Figure 3 , Figure 4 The air distribution unit 2000 includes a gas distribution pipe 8, and a plurality of gas distribution pipes 8 are arranged at intervals on the same horizontal plane and arranged in parallel at intervals. As shown in the drawings, Figure 4 The gas distribution pipe 8 is a straight pipe, and the air distribution holes 81 are arranged in rows at intervals along the length direction of the gas distribution pipe 8, and are used for sending the gas in the pipe to the material passage in the box body of the heavy cooler body 1, so as to ensure that there is enough gas flow to make the material in a fluidization state. As shown in the drawings,Figure 6 As shown in (a), a row of air distribution holes 81 is provided below the gas distribution pipe 8, such as Figure 6 As shown in (b), three rows of air distribution holes 81 are provided below the gas distribution pipe 8, which have a larger opening ratio to increase the flow rate.

[0105] Preferably, the opening ratio of the air distribution hole 81 below the feed inlet 101 in the uppermost gas distribution component 2 is greater than that in other positions, so as to improve the uniform distribution effect of the material at the discharge point.

[0106] like Figure 3 and Figure 5 As shown, the horizontal extension direction of the gas distribution pipe 8 is perpendicular to the horizontal extension direction of the heat exchanger pipe 32 in the heat exchanger assembly 3 (e.g., Figure 3 (a) shown), or the horizontal extension direction of the gas distribution pipe 8 is perpendicular to the horizontal extension direction of the heat exchange plate 33 in the heat exchanger assembly 3 (as shown in a diagram). Figure 3 (b) shows that the first material channel 1000 and the second material channel 3000 are perpendicularly connected to each other. The arrangement of the gas distribution pipe 8 and the opening method on the pipe wall are used to ensure that the gas diffuses evenly across the entire cross-section of the recooler body 1 and passes upward through the material layer; a gas distribution main pipe 800 is installed on the outside of the recooler body 1, and a second connecting pipe 900 connects the gas distribution pipe 8 to the gas distribution main pipe 800.

[0107] like Figure 1 As shown, in this embodiment, the gas distribution component 2 is horizontally positioned in the material fluidization section 100 to fluidize the material above the gas distribution component 2, forming a fluidized bed of a certain height (e.g., 500–1000 mm). To achieve better cooling, the gas distribution component 2 can also introduce dry, cold gas into the refrigeration unit 1. Furthermore, to improve the deep drying effect, the gas distribution component 2 can also introduce hot, dry air at a temperature higher than the material temperature or dry air at a temperature similar to the material temperature into the refrigeration unit 1, heating or maintaining the material temperature while fluidizing it.

[0108] In this embodiment, the cross-sectional area of ​​the material fluidization section 100 shell is uniform. The fluidization velocity generated by the ventilation of the material fluidization section is the average wind speed through the cross section calculated based on the horizontal net cross-sectional area of ​​the material fluidization section 100. When the gas distribution component 2 of the material fluidization section 100 works independently, the fluidization velocity is 1 to 6 times the critical fluidization velocity calculated based on the average particle size of the material.

[0109] Preferably, the fluidization state of the material is bubbling fluidization.

[0110] like Figure 1As shown, the water uniformization cooling device further comprises a gas distribution assembly 2 arranged in the gravity cooling section 200 and connected with the gas supply system, which is used to introduce dry gas into the gravity cooling section 200 to make the material in the gravity cooling section 200 in a gassed state.

[0111] In the gravity cooling section 200, a gas distribution assembly 2 is arranged below each layer of heat exchanger assemblies 3, and each layer of gas distribution assemblies 2 comprises one or more gas distribution assemblies 2.

[0112] In this embodiment, since the material in the gravity cooling section 200 is uniformly distributed, it is only necessary to keep the material in a gassed state, and therefore, as shown in Figure 6 As shown in (a), the lower half of each gas distribution pipe 8 in the gas distribution assembly 2 is provided with a row of holes along the length direction, and the opening rate thereof is less than that of the gas distribution assembly 2 in the material fluidization section 100 according to different functional requirements.

[0113] The cross-sectional area of the gravity cooling section 200 is uniform, and the operating wind speed generated by the ventilation volume or the sum of the ventilation volumes of the gas distribution assemblies 2 in the gravity cooling section 200 is the average wind speed passing through the cross section calculated according to the horizontal net cross-sectional area of the gravity cooling section 200, which is 0-0.5 times the critical fluidization speed calculated according to the average particle size of the material. When the gas distribution assemblies 2 in the material fluidization section 100 and the gravity cooling section 200 work simultaneously, the fluidization wind speed generated by the ventilation volume of the gas distribution assemblies 2 in the material fluidization section 100 calculated separately is not less than 0.7 times the critical fluidization speed calculated according to the average particle size of the material, and the fluidization wind speed generated by the sum of the ventilation volumes of the gas distribution assemblies 2 is not less than 1.2 times the critical fluidization speed calculated according to the average particle size of the material. According to the effect of dry gas replacement and material cooling of the upper material fluidization section 100 and / or the upper material cooling section, the gas distribution assemblies 2 in part of the gravity cooling section 200 can be not opened or opened, and the gas supply volume can be adjusted.

[0114] The gravity cooling section 200 is provided with at least one layer of heat exchanger assemblies 3 connected with the heat exchange medium supply system, and each layer of heat exchanger assemblies 3 comprises two or more heat exchangers 31. In this embodiment, each layer of heat exchanger assemblies 3 is provided with a row of heat exchangers 31 or a column of heat exchangers 31, which are arranged side by side along the length direction of the cross section of the gravity cooler body 1 or arranged side by side along the width direction of the cross section of the gravity cooler body 1.

[0115] As shown in Figure 1 As shown in (a), the gravity cooler body 1 forms a cooling channel 300 in the vertical direction corresponding to the number of heat exchangers 31 in each layer of heat exchanger assemblies 3, and each layer of heat exchangers 31 is arranged in the corresponding cooling channel 300, i.e., each heat exchanger 31 in each layer is arranged in the corresponding cooling channel 300 in the vertical direction.

[0116] In this embodiment, the heat exchange medium supply system is used to provide refrigerant to the heat exchanger assembly 3.

[0117] The gas supply system includes a gas dehumidification device and / or a cooling device, and the heat exchange medium supply system includes a fluid cooling device (not shown in the drawings of this embodiment).

[0118] The gas dehumidification device is used to remove moisture in the gas to obtain dry gas, the gas cooling device is used to control the temperature of the dry gas, and the fluid cooling device is used to control the temperature of the refrigerant to avoid moisture absorption, caking or scabbing on the wall of the heat exchanger.

[0119] The temperature of the refrigerant of each layer of the heat exchanger assembly 3 decreases from top to bottom, thereby reducing the temperature difference between the refrigerant of the heat exchanger assembly 3 and the material outside. Each layer of the heat exchanger assembly 3 uses an independent heat exchange medium supply system to separately control the flow and temperature of the refrigerant. Each independent heat exchange medium supply system includes a refrigerant heat exchanger, a pump, a circulating water tank and corresponding pipeline systems.

[0120] In this embodiment, as shown in Figure 17 When the heat exchanger assembly 3 is a tubular heat exchanger, the heat exchanger assembly 3 includes a plurality of heat exchange tubes arranged in the horizontal direction. Each heat exchange tube includes a plurality of horizontal tube portions arranged in the vertical direction and a plurality of elbow portions arranged in the horizontal direction to connect adjacent horizontal tube portions. The bottom and top horizontal tube portions of each heat exchange tube extend to the outside of the heavy cooler body 1 and are connected to the refrigerant / heat medium inlet or outlet distribution header. Adjacent two heat exchange tubes are arranged in a staggered manner in the vertical direction. A plurality of partitions 303 and a panel 301 are used to fix the heat exchange tubes to form an independent heat exchanger assembly. The heat exchanger assembly 3 is arranged in the heavy cooler body 1 in a pullable manner. The panel 301 is used as a fixing flange and is connected to the heavy cooler body 1 by a sealing gasket 302 and bolts (not shown in the drawings). The heat exchanger assembly 3 and the heavy cooler body 1 are connected by the end face sealing plate (i.e. the panel 301) and the fixing member (e.g. bolts). An annular sealing strip (i.e. the sealing gasket 302) is arranged between the heat exchanger assembly 3 and the heavy cooler body 1. During maintenance, the heat exchanger assembly can be easily pulled out and installed from the side of the heavy cooler body 1.

[0121] Further preferably, adjacent two heat exchange tubes are arranged in a staggered manner in the vertical direction.

[0122] As shown in Figure 18As shown, when the heat exchanger assembly 3 is a plate heat exchanger, the plate heat exchanger is provided with a row of point-shaped welding areas and linear welds arranged in an up-and-down staggered manner, pillow-shaped expansion areas are formed between the point-shaped welding areas as channels for the heat exchange medium, and each local welding area is raised to form a generally bowl-shaped pit. The linear welds arranged in an up-and-down staggered manner form a serpentine path for the heat exchange medium. The pits of adjacent rows (or columns) are generally staggered to increase the disturbance in the internal fluid flow and the external granular material flow, and the overall flow mode of the serpentine path avoids internal fluid short circuiting, increases the flow length, and increases the flow speed; the above measures can significantly improve the flow and heat transfer characteristics of the fluid and the material. When the heat exchanger assembly 3 is a plate heat exchanger, in order to facilitate the maintenance of the heat exchange plate 33, as shown in Figure 7 and Figure 18 , the heat exchanger assembly 3 is provided with a maintenance door 7 on the corresponding heavy cooler body 1.

[0123] As shown in Figure 17 , Figure 18 , the heavy cooler body 1 is provided with an inlet distribution header 500 and an outlet distribution header 600 for the refrigerant outside the shell, and a first connecting pipe 700 for connecting the heat exchange pipe or heat exchange plate of the heat exchanger assembly 3 with the inlet distribution header 500 or the outlet distribution header 600. The refrigerant enters each heat exchanger assembly 3 from the inlet distribution header 500, exchanges heat indirectly with the material in the heat exchanger assembly 3, and then collects into the outlet distribution header 600. The refrigerant can enter the heat exchanger assembly 3 from the lower distribution header and be discharged from the upper distribution header, that is, the inlet distribution header 500 is arranged below the outlet distribution header 600, thereby forming countercurrent heat exchange opposite to the flow direction of the material, obtaining a higher heat exchange temperature difference, and cooling the material faster. Because the heat exchange temperature difference is lower, the material cooling process can be carried out gently.

[0124] In this embodiment, each layer of the heat exchanger assembly 3 can be provided with a row of heat exchangers 31, and each row of heat exchangers 31 is arranged at intervals along the length direction of the cross section of the heavy cooler body 1, and each row includes at least two heat exchangers 31. As shown in Figure 7 , in this embodiment, each layer is provided with three heat exchangers 31 arranged side by side. Two gas distribution headers 800 are used to supply air to a further lengthened gas distribution assembly 2, and the heat exchange pipe or heat exchange plate is perpendicular to the gas distribution pipe 8. Three maintenance doors 7 are arranged side by side on the side opposite to the refrigerant inlet and outlet headers. The maintenance door 7 is hinged to the heavy cooler body 1 through a rotating shaft, and the maintenance door 7 can be opened and closed around the rotating shaft to facilitate cleaning and maintenance of the heat exchanger assembly 3. In the above structure of this embodiment, the discharge section is composed of more than one inverted conical discharge section, as shown in Figure 1As shown, each cooling channel 300 is provided with an inverted conical discharge section 4 and a discharge port 103 arranged at the bottom of the inverted conical discharge section 4. Figure 8 As shown, three discharge ports 103 are provided in the embodiment.

[0125] As shown, the water uniformization cooling device further comprises a discharge device 5 with adjustable flow rate, and each discharge port 103 shares one discharge device 5. Specifically, each discharge port 103 is connected to a joint discharge port through a discharge short pipe, and then connected to the discharge device 5 to form a discharge flow 106, which can save the cost of equipment. Alternatively, two adjacent discharge ports 103 can be combined into a joint discharge port, and the remaining one discharge port 103 can be discharged alone, or each discharge port 103 can be connected to a discharge device 5. Figure 1

[0126] In addition, the top of the recirculator body 1 is provided with a material level meter 9 for measuring the height of the material. The discharge device 5 can adjust the flow rate to control the discharging speed of the material and control the height of the material level.

[0127] In the embodiment, two rows of heat exchangers 31 or two columns of heat exchangers 31 can be arranged in each layer of heat exchanger assembly 3, and the heat exchangers 31 are arranged symmetrically along the axis of the cross-sectional length of the recirculator body 1 or symmetrically along the axis of the cross-sectional width of the recirculator body 1. As shown, Figure 9 As shown, two columns of heat exchangers 31 are arranged in each layer of heat exchanger assembly 3, and each layer of heat exchanger assembly 3 comprises a pair of heat exchangers 31 arranged symmetrically along the axis of the cross-sectional width of the recirculator body 1, i.e. two groups of heat exchangers 31. The heat exchangers can be pulled out from the left and right sides of the recirculator body 1 for maintenance. As shown, Figure 10 As shown, two discharge ports 103 are provided. The two discharge ports 103 are combined into a joint discharge port through a discharge short pipe, and then connected to a discharge device 5.

[0128] In terms of system arrangement, when the recirculator body 1 can extend in one direction in the horizontal direction, and the space is limited in the other horizontal direction, for heat exchanger assemblies in the form of heat exchange pipes, it is more suitable to expand the horizontal cross-sectional area in a symmetrical manner to improve the processing capacity of the device, because when the heat exchanger is pulled out, the heat exchange pipes can be cleaned in three directions in the horizontal plane, without having to clean the plate surface from the opposite side of the distribution header as in heat exchanger assemblies in the form of heat exchange plates.

[0129] ​In this embodiment, the discharger 5 can be any one of rotary lock gas discharge valve, vibration discharger, belt discharger, single shaft or multi-shaft screw discharger, etc. The discharger 5 has a driving device and a discharging speed controller. The discharging speed controller controls the discharging flow of the discharger 5 by receiving the electric signal of the material level meter 9 installed on the top of the heavy cooler body 1, and ensures that the upper surface 104 of the material layer is higher than the upper surface of the gas distribution assembly 2 by a predetermined height (which can be preset), so as to form a fluidized material layer with a certain height on the upper part, ensure the uniformity of the material, and realize the full replacement of the wet hot gas carried by the incoming material to be cooled, so as to prevent the material from absorbing moisture and scarring on the surface of the heat exchanger assembly 3.

[0130] In this embodiment, when the multi-layer heat exchanger assembly 3 is provided, the tubular heat exchanger and the plate heat exchanger can be used in different cooling sections. Preferably, the extension directions of the heat exchange pipes or the heat exchange plates of all layers are the same in the horizontal direction, and the heat exchange pipe groups or the heat exchange plate groups of the upper and lower adjacent heat exchanger assemblies are arranged in a staggered manner in the horizontal direction, that is, the first material passages 1000 of the upper and lower adjacent two layers of heat exchanger assemblies 3 are arranged in parallel with each other, and the first material passages 1000 of the upper and lower adjacent two layers of heat exchanger assemblies 3 are arranged in a staggered manner in the horizontal direction. Figure 15 As shown in the staggered arrangement of the heat exchange pipes 32, Figure 16 As shown in the staggered arrangement of the heat exchange plates, Figure 5 As shown, the tubular heat exchanger and the plate heat exchanger can also be arranged in a staggered manner when they are adjacent in the vertical direction. This arrangement can make the material flowing downward in the first material passage 1000 formed between the adjacent heat exchange pipes or the adjacent heat exchange plates of the previous heat exchanger assembly be distributed into two adjacent first material passages 1000 when entering the next heat exchanger assembly, thereby increasing the lateral movement of the material, breaking the slight adhesion phenomenon between the materials, increasing the mixing of the materials between different temperatures, and improving the uniformity of the material temperature.

[0131] As shown in the staggered arrangement of the heat exchange pipes 32, Figure 1 As shown, the shell at the bottom of the heavy cooler body 1 at the discharge port 103 is provided with an auxiliary discharging device 6. The auxiliary discharging device 6 is used to assist the flow of the material by mechanically vibrating or knocking the shell of the heavy cooler body 1 or by instantaneously releasing compressed air into the material to loosen the material. Specifically, one or more auxiliary discharging devices for vibrating, knocking, etc. can be installed on the wall surface of the discharge section to assist the flow of the material in the cone by mechanical vibration or knocking; or one or more auxiliary discharging devices for impacting the material with compressed gas can be installed to loosen the material by instantaneously releasing compressed air. The function of the auxiliary discharging device is to prevent the occurrence of local hardening or "bridge" of the material and to ensure that the material flows out smoothly in the form of a whole.

[0132] The water uniformization cooling device further comprises a support, an ear, a flange, a manhole, a hand hole, a sight glass, an instrument mounting seat (hole) and other accessory components and structures for supporting, fixing, hoisting, connecting, repairing, observing, detecting and the like. These are required in conventional engineering or equipment design, and will not be described here.

[0133] The utility model has the following beneficial effects when treating powder and granular products in a fermentation plant, especially when treating products that are prone to moisture absorption and caking:

[0134] 1. The problem of material caking and scarring on the surface of the heat exchange plates (or tubes) is effectively solved, especially for the first and second heat exchange groups in contact with the feed, thereby ensuring long-term stable operation of the equipment without blockage, scarring or changes in heat exchange efficiency, and the material itself is not lumped during the cooling process.

[0135] 2. The entire cooling process is uniform and consistent, the cooling depth is further improved, and a product with lower temperature, more uniform temperature and moisture, and no moisture absorption can be obtained, thereby effectively solving the product hardening phenomenon during the storage and transportation period.

[0136] 3. The functions of deep drying, moisture uniformization and deep cooling of the material are completed in the same equipment, expanding the performance of the equipment.

[0137] 4. The height-diameter ratio of the equipment is reduced (for rectangular equipment, the height-length ratio or height-width ratio is reduced), and uniform and consistent deep cooling effects can still be ensured at a lower height-diameter ratio, or a larger cross section can be used at the same height while ensuring uniform cooling effects, thereby improving the production capacity of the equipment. The reduction in equipment height also reduces the investment in equipment and plant.

[0138] Example 2

[0139] As shown in Figure 2 , the difference from example 1 is that an enlarged section 400 is provided above the material fluidization section 100. Specifically, the lower shell of the feed section is a shell with a rectangular cross section, the upper shell is an enlarged shell with a rectangular cross section, and the shell between the upper and lower shells is a gradually enlarged conical shell. The top of the upper shell is provided with a plurality of feed ports 101 for adding powder and granular materials to be treated discharged from different dryers; the heavy cooler body 1 is further provided with a plurality of exhaust ports 102 for discharging gas.

[0140] The material in working state is usually located in the lower shell, with an obvious material layer upper surface 104, and the upper part of the material layer has a certain height of the tapered shell with gradually expanded cross section and the expanded upper shell as the gas-solid separation space. Since the wind speed gradually decreases during the rising process of the tail gas, more small particles entrained in the tail gas re-settle in this space. Only fine powder is entrained from the tail gas. Therefore, the cooling device can work at a higher fluidization speed without increasing the amount of particles entrained by the tail gas. This structure with an expanded section is very advantageous when the ventilation volume is large or when the fine powder in the material needs to be avoided from being excessively entrained.

[0141] As shown in Figure 2 The difference between the embodiment 1 and the embodiment 2 is that the material fluidization section 100 is provided with a heat exchanger assembly 3 connected with a heat exchange medium supply system.

[0142] The heat exchange medium supply system is used to provide refrigerant for the heat exchanger assembly 3 in the material fluidization section 100.

[0143] Specifically, the material fluidization section 100 is provided with a layer of heat exchanger assembly 3, and the upper and lower sides of the heat exchanger assembly 3 in the material fluidization section 100 are each provided with a layer of gas distribution assembly 2.

[0144] Preferably, the heat exchanger assembly 3 of the material fluidization section 100 is a tubular heat exchanger. The heat exchanger assembly 3 of the material fluidization section 100 uses a tubular heat exchanger because the heat exchange tube has better pressure and temperature resistance than the heat exchange plate, and can better adapt to high-temperature and high-pressure heat sources such as steam. In the gravity cooling section 200, the heat exchanger assembly 3 preferably uses a heat exchanger in the form of a heat exchange plate, and the flow channels between the heat exchange plates are more conducive to the flow of material and gas.

[0145] In this embodiment, two layers of gas distribution assemblies 2 can be used to simultaneously perform deep drying and cooling operations on the incoming material, further improving the quality of the product. The description is as follows:

[0146] By introducing dry gas into the upper gas distribution assembly 2, the flow rate of the introduced gas, or by adding the ventilation volume from the lower gas distribution assembly, the upper limit of the fluidization number can be operated between 3 and 6, and the material layer is in a more intense boiling state. While completely eliminating the feeding cone and segregation phenomenon and fully replacing the moisture gas in the feed, the high heat and mass transfer rate of the fluidized material layer is used to perform deep drying on the material to further reduce the moisture content of the feed, and to eliminate the differences in moisture content of the material at different locations. In order to further improve the effect of deep drying and eliminate the moisture differences of particles of different particle sizes, the temperature of the dry gas can be appropriately increased until it approaches the feed temperature, so as to reduce the relative humidity of the gas in the gap between the particles and increase the mass and heat transfer driving force for the diffusion of moisture in the material to the gas.

[0147] For the material with strong hygroscopic and caking properties, the flow number of the material is kept above 1 by the flow rate of the gas introduced into the gas distribution assembly 2 at the lower side (and the flow rate of the gas introduced into the gas distribution assembly 2 at the lower side when the gas distribution assembly 2 at the lower side of the gravitational cooling section 200 is working), so that the material layer in the region of the heat exchanger assembly 3 is also uniformly and sufficiently in the bubbling fluidization state, avoiding the situation of local material flow blockage; the heat transfer efficiency of the cooling process of the material in the fluidization state with the heat exchange wall surface is also high, and the scouring of the material in the fluidization state to the heat exchange wall surface prevents or reduces the scabbing of the material at the wall surface in the high-temperature section.

[0148] For the material with weak hygroscopic and caking properties or in the dry and cold season, a small amount of dry and cold gas is introduced into the gas distribution assembly 2 at the lower side to replace the hot gas in the gap of the material particles in the heat exchanger region, i.e., the heat exchanger assembly 3, and discharge the gas upwardly to the fluidized bed layer. Since the moisture in the material has been further removed and homogenized in the material layer above the gas distribution assembly 2 at the upper side, the gas in the gap of the material particles still has a very low moisture content, and the possibility of caking or scabbing of the material in the cooling section can be avoided under the condition of introducing a small amount of dry and cold gas; or the gas distribution assembly 2 at the lower side can not be ventilated, and only the heat exchanger assembly 3 is used to cool the material. In these two cases, the gas assembly 2 at the lower side of the material fluidization section 100 is equivalent to the gas distribution assembly 2 in the gravitational cooling section 200 in Embodiment 1, and the selection of the operating air speed is similar, thereby saving the power consumption required for gas pressurization.

[0149] Further expansion, as shown in Figure 19 Each layer of the heat exchanger assembly includes a plurality of heat exchangers 31 arranged in series in an up-down arrangement, and the adjacent heat exchangers 31 are spaced apart from each other, and the inlet distribution header 500 and the outlet distribution header 600 of the adjacent heat exchangers 31 are connected in sequence, and the refrigerant enters the multiple layers of heat exchangers in series to increase the total temperature difference of the refrigerant inlet and outlet and reduce the refrigerant flow. When each layer of the heat exchanger assembly 3 includes a plurality of heat exchangers 31 arranged in series in an up-down arrangement, in addition to the gas distribution assembly 2 arranged at the lowermost heat exchanger, a gas distribution assembly 2 can also be arranged between the adjacent heat exchangers 31 in the interior of each layer of the heat exchanger assembly as needed, so as to reduce the height of the fluidization air or the displacement air passing through the material layer, thereby reducing the non-uniformity of the gas distribution and reducing the resistance of the gas passing through the material layer.

[0150] Embodiment 3

[0151] Different from Embodiment 1, two rows of heat exchangers 31 or two columns of heat exchangers 31 are arranged in each layer of the heat exchanger assembly 3, and the heat exchangers 31 are arranged symmetrically along the axis of the cross-sectional length direction of the regenerator body 1 or symmetrically along the axis of the cross-sectional width direction of the regenerator body 1.

[0152] For the requirement of the device processing capacity is greater, but highly limited space, in order to make full use of limited space, shorten the height of the device.

[0153] In the embodiment, as shown in Figure 11 Each layer of heat exchanger assembly 3 includes two rows of symmetrically arranged heat exchanger 31, i.e. two heat exchangers 31 are arranged in each row. As shown in Figure 12 Correspondingly, four discharge ports 103 are arranged. For the need of system design such as reducing the height of the device, each discharge port 103 is independently connected with a discharger 5.

[0154] In addition, as shown in Figure 13 In the embodiment, each layer of heat exchanger assembly 3 can also be arranged with two rows of symmetrically arranged heat exchangers 31, i.e. three heat exchangers 31 are arranged in each row. One elongated gas distribution assembly 2 is arranged below each row of heat exchanger assembly 3. As shown in Figure 14 Correspondingly, six discharge ports 103 are arranged. For the need of system design such as reducing the height of the device, each discharge port 103 is independently connected with a discharger 5.

Claims

1. A moisture uniformization cooling device, characterized by: The heavy cooler body (1), the gas distribution assembly (2), the heat exchanger assembly (3), the gas supply system and the heat exchange medium supply system are included. The heat exchanger assembly (3) is a plate heat exchanger or a tube heat exchanger, and a first material passage (1000) is arranged between the heat exchange plates or the heat exchange tubes of the heat exchanger assembly (3). The gas distribution assembly (2) is horizontally arranged in the heavy cooler body (1) and includes air distribution units (2000) arranged at intervals along the cross section of the heavy cooler body (1) and second material passages (3000) arranged between the air distribution units (2000). The heavy cooler body (1) is a vertical shell, and the top of the heavy cooler body (1) is provided with a feeding port (101) and an exhaust port (102), and the bottom of the heavy cooler body (1) is provided with a discharging port (103). The heavy cooler body (1) is provided with a material fluidization section (100) and a gravity cooling section (200) from top to bottom. The material fluidization section (100) is provided with the gas distribution assembly (2) connected with the gas supply system. The gas distribution assembly (2) is used for introducing dry gas into the heavy cooler body (1) to make the material in the material fluidization section (100) in a fluidized state. The gravity cooling section (200) is provided with at least one layer of heat exchanger assembly (3) connected with the heat exchange medium supply system, and each layer of heat exchanger assembly (3) includes two or more heat exchangers (31). The heat exchange medium supply system is used for providing refrigerant to the heat exchanger assembly (3).

2. The moisture uniformizing cooling device according to claim 1, characterized by: The gas distribution assembly (2) arranged in the gravity cooling section (200) and connected with the gas supply system is further included, and the gas distribution assembly (2) is used for introducing dry gas into the heavy cooler body (1) to make the material in the gravity cooling section (200) in an aerated state. Each layer of heat exchanger assembly (3) is provided with a layer of gas distribution assembly (2) below, and each layer of gas distribution assembly (2) includes one or more gas distribution assemblies (2).

3. The moisture uniformizing cooling device according to claim 2, characterized in that: Each layer of heat exchanger assembly (3) is provided with a row of heat exchangers (31) or a column of heat exchangers (31), and the heat exchangers (31) are arranged in parallel along the length direction of the cross section of the heavy cooler body (1) or arranged in parallel along the width direction of the cross section of the heavy cooler body (1).

4. The moisture uniformizing cooling device according to claim 2, characterized by: Each layer of heat exchanger assembly (3) is provided with two rows of heat exchangers (31) or two columns of heat exchangers (31), and the heat exchangers (31) are arranged symmetrically along the axis of the length direction of the cross section of the heavy cooler body (1) or arranged symmetrically along the axis of the width direction of the cross section of the heavy cooler body (1).

5. The moisture uniformizing cooling device according to claim 1, characterized by: The material fluidization section (100) is provided with the heat exchanger assembly (3) connected with the heat exchange medium supply system. The heat exchange medium supply system is used for providing refrigerant to the heat exchanger assembly (3) in the material fluidization section (100).

6. The moisture uniformizing cooling device according to claim 1, characterized by: The bottom of each heat exchanger (31) in the lowermost layer is provided with an inverted conical discharging section (4) and a discharging port (103), and the discharging port (103) is arranged at the bottom of the inverted conical discharging section (4).

7. The moisture uniformizing cooling device according to claim 6, characterized in that: Further included are a flow-adjustable discharger (5) and a material level meter, and each discharging port (103) shares one discharger (5) or each discharging port (103) is provided with one discharger (5). The level meter is arranged on the top of the heavy cooler body (1) and is used for measuring the material level height in the heavy cooler body (1). The discharger (5) is connected with the discharge port (103) and is used for adjusting the discharging speed of the material to control the material level height in the heavy cooler body (1).

8. The moisture uniformizing cooling device according to claim 1, characterized by: An expansion section (400) is arranged above the material fluidization section (100).

9. The moisture uniformizing cooling device according to claim 1, characterized by: The material channels (1000) of the upper and lower adjacent two layers of the heat exchanger assemblies (3) are arranged in parallel to each other and are staggered in the horizontal direction.

10. The moisture uniformizing cooling device according to claim 1, characterized by: The heat exchanger assembly (3) is arranged in the heavy cooler body (1) in a pullable manner. Alternatively, the heat exchanger assembly (3) is provided with an access door (7) on the corresponding heavy cooler body (1).

11. The moisture uniformizing cooling device according to claim 1, characterized by: The heat exchanger assembly (3) of the material fluidization section (100) is a tubular heat exchanger.

12. The moisture uniformizing cooling device according to claim 1, characterized by: The heat exchanger assembly (3) comprises a plurality of heat exchange pipes arranged in the horizontal direction in a spaced manner, and the heat exchange pipes are serpentine pipes extending in the vertical direction.

13. The moisture uniformization cooling device of claim 12, wherein: The adjacent two serpentine heat exchange pipes are arranged in a staggered manner in the vertical direction.

14. The moisture uniformizing cooling device of claim 1, wherein: The air distribution unit (2000) comprises a gas distribution pipe (8), and the air distribution unit (2000) is provided with air distribution holes (81) below the gas distribution pipe (8). The air distribution holes (81) are arranged in rows in the axial direction of the gas distribution pipe (8) and are spaced from each other, and at least one row of air distribution holes (81) is arranged below each gas distribution pipe (8).

15. The moisture uniformization cooling device of claim 14, wherein: The gas distribution pipe (8) is a straight pipe.

16. The moisture uniformizing cooling device of claim 14, wherein: The gas distribution pipe (8) is perpendicular to the heat exchange pipes in the heat exchanger assembly (3) or the gas distribution pipe (8) is perpendicular to the heat exchange plates in the heat exchanger assembly (3).

17. The moisture uniformizing cooling device of claim 14, wherein: The opening rate of the gas distribution assembly (2) in the material fluidization section (100) is greater than the opening rate of the gas distribution assembly (2) in the gravity cooling section (200).

18. The moisture uniformizing cooling device of claim 14, wherein: The opening rate of the air distribution hole (81) below the feed port (101) of the uppermost gas distribution assembly (2) is greater than the opening rate at other positions.

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