Medium-temperature belt type sludge drying machine

Abstract

The utility model relates to a medium-temperature belt type sludge drying machine which comprises a drying machine main body, the drying machine main body comprises a low-temperature heating unit, a medium-temperature drying unit and a high-temperature evaporation unit which are sequentially arranged from left to right and are communicated, a mesh belt running from left to right is further arranged in the drying machine main body, and a chain slag scraper is arranged below the mesh belt. A material inlet is formed in the upper portion of the low-temperature heating unit, a material outlet is formed in the lower portion of the high-temperature evaporation unit, the high-temperature evaporation unit is provided with a fresh air inlet, the low-temperature heating unit is provided with a waste gas outlet, and the low-temperature heating unit, the medium-temperature drying unit and the high-temperature evaporation unit are each provided with a circulating fan and a rotor evaporation radiator. The low-failure-rate belt type drying machine is long in service life, low in failure rate, low in operation cost and low in comprehensive manufacturing cost, and is mature and reliable between high temperature and low temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying machines, in particular to a medium-temperature zone type sludge drying machine. Background Art

[0002] During the sewage treatment process in the chemical, papermaking, municipal and mineral processing industries, a large amount of sludge will be generated, which needs to be further disposed harmlessly. In the process of disposal, in order to reduce the amount of sludge, reduce energy consumption and reduce secondary pollution, the sludge needs to be dried, which requires sludge drying equipment. There are many types of sludge drying equipment, the most common ones are paddle type, disc type, belt type, and various derivative styles; each type of drying equipment has its own advantages and disadvantages, and has its own applicable materials and working conditions. Among them, the belt dryer is widely used in the food, pharmaceutical, grain, wood, fruit and vegetable, and flower quick-drying industries because there is no direct contact wear during the material drying process, high efficiency, the material remains granular after drying, and the material cells remain intact.

[0003] The belt dryer is divided into low temperature and high temperature modes. The drying temperature of the low temperature mode is below 80℃. The advantages of the equipment are low operating cost and few mechanical failures. The disadvantage is that the equipment is expensive, which is twice the price of the high temperature dryer. Due to the high requirements of the condenser for environmental cleanliness, the low temperature dryer needs to be equipped with a bag filter dust removal device, which is easy to clog and requires frequent and regular replacement and treatment by manual labor. The working condition is poor; the operating principle of the equipment is that the drying air is circulated internally without external discharge, and no odor treatment device is required. It is only suitable for media that do not produce harmful gases, and is not suitable for sludge drying in the water treatment industry containing hydrogen sulfide. The drying temperature of the high temperature belt dryer is below 140℃. The overall structure is relatively simple, the structural strength is large, and it is resistant to high temperature. Theoretically, the failure rate is low and it is not easy to damage. It is suitable for heavier and large particles and block drying, and is applicable to the grain, wood, and mineral sand industries. The disadvantage is that its matching mud strip extruder cannot handle sludge containing longer fibers and plastic sheets, and is very easy to clog; due to high temperature working conditions, if the cleaning of the machine is not timely, the high temperature dried floc debris will catch fire, which will cause a serious fire and burn the equipment. Utility Model Content

[0004] In order to overcome the shortcomings of low-temperature dryers, such as high investment and later maintenance costs, and high-temperature dryers that are prone to fire, a medium-temperature zone sludge dryer is proposed to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A medium-temperature belt dryer comprises a dryer body, the dryer body comprises a heat-insulating outer shell, the inner cavity of the dryer body is provided with a low-temperature heating unit, a medium-temperature drying unit and a high-temperature evaporation unit which are arranged in sequence from left to right and communicate with each other, a mesh belt which runs from left to right is also provided in the dryer body, a chain scraper is provided below the mesh belt, a material inlet is provided above the low-temperature heating unit, a material outlet is provided below the high-temperature evaporation unit, a fresh air inlet is provided in the high-temperature evaporation unit, a waste gas outlet is provided in the low-temperature heating unit, and the low-temperature heating unit, the medium-temperature drying unit and the high-temperature evaporation unit are all provided with a circulating fan and a rotor evaporation radiator.

[0007] As a further technical solution of the utility model: the fresh air inlet and the exhaust gas outlet are connected to the gas replacement device, the gas replacement device includes an air heat exchanger, the air heat exchanger is provided with a heat exchanger exhaust gas inlet and a heat exchanger exhaust gas outlet, the exhaust gas outlet is connected with the heat exchanger exhaust gas inlet, and the heat exchanger exhaust gas outlet is connected to the exhaust gas induced draft fan; the air heat exchanger is also provided with a heat exchanger fresh air inlet and a heat exchanger fresh air outlet, the heat exchanger fresh air outlet is connected to the fresh air fan, and the fresh air fan is connected to the fresh air inlet.

[0008] As a further technical solution of the utility model: a belt dewatering device is arranged on the front side of the dryer body, the belt dewatering device is connected to the sludge strip cutter, and the sludge strip cutter outlet is connected to the material inlet.

[0009] As a further technical solution of the present utility model: a partition is provided between the low-temperature heating unit, the medium-temperature drying unit and the high-temperature evaporation unit.

[0010] As a further technical solution of the present invention: the gases of the low-temperature heating unit, the medium-temperature drying unit and the high-temperature evaporation unit are connected to the circulation fan via a circulation return air duct.

[0011] Beneficial effects of the utility model:

[0012] The main body of the utility model dryer includes a low-temperature heating unit, a medium-temperature drying unit and a high-temperature evaporation unit. The sludge is first cut into strips and evenly spread on the stainless steel mesh belt. The mesh belt passes through the low-temperature heating zone, the medium-temperature drying zone and the high-temperature evaporation zone in succession. The fresh air enters the dryer through the air waste heat recovery heat exchanger and the condensed water heat exchanger, and first fully contacts with the dried sludge, absorbs the heat in the sludge, and reduces the sludge temperature to below 100°C; then enters the high-temperature drying zone in the dryer, and the temperature rises rapidly to 100 or 120°C (the temperature is selected according to the process requirements), and finally reaches the feed end of the dryer, contacts with the low-temperature wet sludge, increases the sludge temperature, and reduces the air temperature to about 60°C. Finally, it passes through the air waste heat recovery heat exchanger, and the temperature drops to about 50°C before being discharged to the subsequent waste gas treatment unit.

[0013] The utility model has obtained data through actual operation, and the steam consumption is reduced by 40% compared with the conventional high-temperature belt dryer; the water removal energy efficiency index is 9; it has been running without trouble for 12 consecutive months; (except for the regular oiling maintenance, cleaning and replacement of the scraper of wearing parts which takes about 3 hours every week, the machine has actually been running for 25 months without any failure); after the mesh belt has been running continuously for 18 months, the rust removal mesh wire has fatigue fracture, and it has been used for 25 months without replacement or repair.

[0014] The utility model has the advantages of long service life, low failure rate, low operation cost and low comprehensive cost, and is a mature and reliable belt drying machine with low failure rate between high temperature and low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 It is a side sectional view of the main structure of the dryer;

[0017] Figure 3 This is a schematic diagram of the main structure of the dryer;

[0018] Figure 4 This is a top view of the main structure of the dryer.

[0019] In the figure: 1-drying machine body, 2-mesh belt, 3-chain scraper, 4-material inlet, 5-material outlet, 6-fresh air inlet, 7-waste gas outlet, 8-circulating fan, 9-rotor evaporative radiator, 11-low temperature heating unit, 12-medium temperature drying unit, 13-high temperature evaporation unit, 10-air heat exchanger, 101-heat exchanger waste gas inlet, 102-heat exchanger waste gas outlet, 103-heat exchanger fresh air inlet, 104-heat exchanger fresh air outlet, 105-fresh fan, 108-waste gas induced draft fan, 14-circulating air outlet duct, 15-partition, 16-insulation shell, 17-belt dehydration equipment, 18-sludge strip cutting machine, 19-mesh belt driving mechanism, 20-circulating return air duct. Implementation

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0021] Reference Figure 1-4A medium-temperature belt dryer includes a dryer body 1, the dryer body 1 includes a heat-insulating shell 16, and the dryer body 1 includes a low-temperature heating unit 11, a medium-temperature drying unit 12, and a high-temperature evaporation unit 13 arranged in sequence from left to right and connected. A mesh belt 2 running from left to right is also arranged in the dryer body 1, and the mesh belt 2 extends from the low-temperature heating unit 11 to the high-temperature evaporation unit 13. The mesh belt 2 adopts a combination of a stainless steel diamond-shaped active branch net and a surface net, and the surface net has 4 meshes. The mesh belt 2 is driven by a mesh belt driving mechanism 19 arranged at both ends. A scraper is also arranged at one end of the mesh belt 2, and the setting position of the scraper corresponds to the material outlet. A mesh belt flushing mechanism is arranged above the mesh belt 2. A guide plate is arranged below the mesh belt 2. A chain scraper 3 is arranged below the mesh belt 2.

[0022] A material inlet 4 is provided above the low-temperature heating unit 11, a material outlet 5 is provided below the high-temperature evaporation unit 13, a fresh air inlet 6 is provided in the high-temperature evaporation unit 13, and an exhaust gas outlet 7 is provided in the low-temperature heating unit 11. The low-temperature heating unit 11, the medium-temperature drying unit 12, and the high-temperature evaporation unit 13 are all provided with a circulating fan 8 and a rotary evaporation radiator 9. The dryer body 1 is assembled in an integral box-type module. The number of modules of each unit is designed according to the load. Each module has a separate circulating fan 7. Figure 1 , each unit consists of a module, refer to Figure 4 The low temperature heating unit 11 includes one module, and the medium temperature drying unit 12 and the high temperature evaporation unit 13 each include two modules. A partition 15 is provided between the low temperature heating unit 11, the medium temperature drying unit 12 and the high temperature evaporation unit 13. If each unit is provided with multiple modules, a partition 15 is provided between adjacent modules.

[0023] A belt dewatering device 17 is provided at the front side of the dryer body 1, and the belt dewatering device 17 is connected to a sludge strip cutter 18, and the outlet of the sludge strip cutter 18 is connected to the material inlet 4. The sludge strip cutter 18 is required to be free of blockage and slippage, and the maximum passing diameter is 30 mm, which meets the requirements of general sludge block impurities.

[0024] The fresh air inlet 6 and the exhaust gas outlet 7 are connected to the gas replacement device, which includes an air heat exchanger 10. The air heat exchanger 10 is provided with a heat exchanger exhaust gas inlet 101 and a heat exchanger exhaust gas outlet 102. The exhaust gas outlet 7 is connected to the heat exchanger exhaust gas inlet 101, and the heat exchanger exhaust gas outlet 102 is connected to the exhaust gas induced draft fan 108; the air heat exchanger 10 is also provided with a heat exchanger fresh air inlet 103 and a heat exchanger fresh air outlet 104. The heat exchanger fresh air outlet 104 is connected to the fresh air fan 105, and the fresh air fan 105 is connected to the fresh air inlet 6.

[0025] The gases from the low temperature heating unit 11, the medium temperature drying unit 12 and the high temperature evaporation unit 13 are connected to the circulation fan 8 via the circulation return air duct 20. The circulation fan 8 is connected to the circulation outlet air duct 14, and air is supplied to each module via the circulation outlet air duct 14, and the circulation air is connected to the circulation fan 8 via the circulation return air duct 20. Example

[0026] Reference Figure 1 and Figure 2 A medium-temperature belt dryer includes a dryer body 1, the dryer body 1 includes a heat-insulating shell 16, and the dryer body 1 includes a low-temperature heating unit 11, a medium-temperature drying unit 12, and a high-temperature evaporation unit 13 arranged in sequence from left to right and connected. A mesh belt 2 running from left to right is also arranged in the dryer body 1, and the mesh belt 2 extends from the low-temperature heating unit 11 to the high-temperature evaporation unit 13. The mesh belt 2 adopts a combination of a stainless steel diamond-shaped active branch net and a surface net, and the surface net has 4 meshes. The mesh belt 2 is driven by a mesh belt driving mechanism 19 arranged at both ends. A scraper is also arranged at one end of the mesh belt 2, and the setting position of the scraper corresponds to the material outlet. A guide plate is arranged below the mesh belt 2. A chain scraper 3 is arranged below the mesh belt 2.

[0027] A material inlet 4 is provided above the low-temperature heating unit 11, a material outlet 5 is provided below the high-temperature evaporation unit 13, a fresh air inlet 6 is provided in the high-temperature evaporation unit 13, and an exhaust gas outlet 7 is provided in the low-temperature heating unit 11. The low-temperature heating unit 11, the medium-temperature drying unit 12, and the high-temperature evaporation unit 13 are all provided with a circulating fan 8 and a rotary evaporation radiator 9. The dryer body 1 is assembled in an integral box-type module. The number of modules of each unit is designed according to the load. Each module has a separate circulating fan 7. Figure 1 , each unit consists of a module, refer to Figure 4 The low temperature heating unit 11 includes one module, and the medium temperature drying unit 12 and the high temperature evaporation unit 13 each include two modules. A partition 15 is provided between the low temperature heating unit 11, the medium temperature drying unit 12 and the high temperature evaporation unit 13. If each unit is provided with multiple modules, a partition 15 is provided between adjacent modules.

[0028] A belt dewatering device 17 is provided at the front side of the dryer body 1, and the belt dewatering device 17 is connected to a sludge strip cutter 18, and the outlet of the sludge strip cutter 18 is connected to the material inlet 4. The sludge strip cutter 18 is required to be free of blockage and slippage, and the maximum passing diameter is 30 mm, which meets the requirements of general sludge block impurities.

[0029] The gases from the low temperature heating unit 11, the medium temperature drying unit 12 and the high temperature evaporation unit 13 are connected to the circulation fan 8 via the circulation return air duct 20. The circulation fan 8 is connected to the circulation outlet air duct 14, and air is supplied to each module via the circulation outlet air duct 14, and the circulation air is connected to the circulation fan 8 via the circulation return air duct 20.

[0030] Specific implementation of the utility model:

[0031] The sludge is cut into strips by a sludge strip cutter, and the strip sludge is evenly spread on the mesh belt 2 from the material inlet 4, with a thickness of about 7-10 cm, without gaps, so as not to short-circuit the circulating air; after the mesh belt 2 is fully spread, it is divided into three units for drying, a low-temperature heating unit 11 (water content 70%, temperature about 30°C), a medium-temperature drying unit 12 (water content 70-50%, temperature about 100°C), and a high-temperature evaporation unit 13 (water content 50-35%, temperature about 120°C). Each module has a separate circulating fan 8 and a rotor evaporative radiator 9.

[0032] Fresh hot dry air enters the dryer body 1 from the high-temperature evaporation unit 13. The sludge in this unit has a high temperature and relatively low humidity, and the driest hot air is required to continue evaporating. The evaporated air enters the medium-temperature drying unit 12 through the guide plate, and continues to evaporate the moisture in the sludge with relatively high humidity. At the same time, the temperature gradually decreases, and finally enters the low-temperature heating unit. The humid hot air at about 100°C comes into contact with the low-temperature sludge with 70% water content that has just entered. The sludge is preheated, and a large amount of heat is absorbed. The hot air temperature drops to about 50°C, and the humidity also increases to the maximum. Finally, it is further cooled by the gas replacement device and discharged to the exhaust gas treatment device.

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mesophilic zone sludge dryer, comprising a dryer body (1), the dryer body (1) comprising a heat-insulating shell (16), characterized in that: The inner cavity of the dryer body (1) is provided with a low-temperature heating unit (11), a medium-temperature drying unit (12) and a high-temperature evaporation unit (13) which are arranged in sequence from left to right and communicate with each other. The dryer body (1) is also provided with a mesh belt (2) which runs from left to right. A chain scraper (3) is provided below the mesh belt (2). A material inlet (4) is provided above the low-temperature heating unit (11). A material outlet (5) is provided below the high-temperature evaporation unit (13). The high-temperature evaporation unit (13) is provided with a fresh air inlet (6). The low-temperature heating unit (11) is provided with an exhaust gas outlet (7). The low-temperature heating unit (11), the medium-temperature drying unit (12) and the high-temperature evaporation unit (13) are all provided with a circulating fan (8) and a rotary vane evaporation radiator (9).

2. The medium-temperature belt sludge drying machine according to claim 1, characterized in that: The fresh air inlet (6) and the waste gas outlet (7) are connected to a gas replacement device, and the gas replacement device comprises an air heat exchanger (10), the air heat exchanger (10) is provided with a heat exchanger waste gas inlet (101) and a heat exchanger waste gas outlet (102), the waste gas outlet (7) is connected to the heat exchanger waste gas inlet (101), and the heat exchanger waste gas outlet (102) is connected to an exhaust gas induced draft fan (108); the air heat exchanger (10) is also provided with a heat exchanger fresh air inlet (103) and a heat exchanger fresh air outlet (104), the heat exchanger fresh air outlet (104) is connected to a fresh air fan (105), and the fresh air fan (105) is connected to the fresh air inlet (6).

3. The medium-temperature belt sludge drying machine according to claim 1, characterized in that: A belt dewatering device (17) is provided on the front side of the dryer body (1); the belt dewatering device (17) is connected to a sludge strip cutter (18); and an outlet of the sludge strip cutter (18) is connected to a material inlet (4).

4. The medium-temperature belt sludge drying machine according to claim 1, characterized in that: A partition (15) is provided between the low-temperature heating unit (11), the medium-temperature drying unit (12) and the high-temperature evaporation unit (13).

5. The medium-temperature belt sludge drying machine according to claim 1, characterized in that: The gases from the low-temperature heating unit (11), the medium-temperature drying unit (12) and the high-temperature evaporation unit (13) are connected to the circulation fan (8) via the circulation return air duct (20).

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