Anti-corrosion energy-saving system for sludge drying

Abstract

The utility model discloses an anti-corrosion energy-saving system for sludge drying, which comprises a casing, and a heat recovery unit, a warming unit and a sludge purification unit which are arranged in the casing, and the casing is provided with an air return port and an air supply port; the heat recovery unit comprises a pre-cooling part and a reheating part, the temperature increasing unit comprises a first compressor, a first condenser, a first throttling valve and a first evaporator, and the sludge purification unit comprises a low-temperature plasma purification assembly and an activated carbon purification assembly. Exhaust air of the sludge drying line sequentially passes through the air return opening, the pre-cooling part, the low-temperature plasma purification assembly, the first evaporator, the activated carbon adsorber, the reheating part, the first condenser and the air supply opening, is subjected to humidity reduction and temperature increase and then is sent back to the sludge drying line. The anti-corrosion energy-saving system for sludge drying has the advantages that waste gas of a sludge drying line can be recycled, a dry and hot clean air heat source is provided for the sludge drying line, and the anti-corrosion energy-saving system has a good energy-saving effect and anti-corrosion performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy -conserving air conditioning equipment technical field especially relates to a kind of for sludge drying's anticorrosive energy -conserving system. BACKGROUND

[0002] Sludge drying is an important technology in sludge disposal technical route. The problem of sludge disposal is to reduce the moisture content, and the moisture content of dewatered sludge is reduced from 80% to 30%, and the total amount is reduced by 71%. Sludge drying is the most direct method of sludge reduction, and the product after sludge drying also creates conditions for carbonization and resource utilization. At present, the device for sludge drying on the market has high investment cost, and the existing sludge drying device generally adopts the technology similar to chemical drying equipment, and does not carry out technical setting to reduce energy consumption. The operation cost and energy consumption exceed the bearing capacity of enterprises, and the high energy consumption does not meet the requirements of energy saving and emission reduction in China. These characteristics greatly limit the application of sludge drying technology.

[0003] The existing equipment for drying sludge by low temperature heating adopts heat recovery technology, and the fully enclosed drying mode has no waste gas emission. The low temperature heating technology accelerates the rapid evaporation of water in sludge, and improves the treatment effect of sludge. However, sludge contains a large amount of bacteria, microorganisms, heavy metals and inorganic substances, and usually sludge has certain acidity or alkalinity. In the low temperature heating sludge drying equipment, the recovered sludge waste gas passes through the heat exchange components in the equipment, which can easily corrode the heat exchange components, so that the equipment cannot be used continuously.

[0004] In the patent with publication number CN216711889U, a "high corrosion-resistant structure design modular net belt type sludge low temperature drying treatment equipment" is disclosed. The condenser and evaporator of the unit are arranged in the independent air duct, so the welding port and pipeline, compressor, liquid storage tank, expansion valve and air duct are separated, and there is an independent chamber. The compressor chamber is below the unit, which can effectively reduce the corrosion hazard of corrosive gas in the sludge drying process, and improve the service life and durability of the whole machine parts. The equipment has the following problems: in the closed loop heating main machine section, bacteria and microorganisms cannot be treated by the filter, and acidic or alkaline air containing these substances can pass through the condenser and evaporator. These corrosive substances circulate in the closed loop heating main machine section and easily adhere to the condenser and evaporator. After a certain period of time, the condenser and evaporator will still be corroded. The pipeline of the heat exchanger is in a corrosive environment for a long time, and the refrigerant in the pipeline is easy to leak, which requires a lot of manpower for maintenance or replacement of parts, increasing the maintenance cost of the equipment.

[0005] Therefore, we propose an anticorrosive energy-saving system for sludge drying. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose lies in providing a kind of for sludge drying's anticorrosive energy-saving system, can recover the waste gas of sludge drying line, provides dry hot clean air heat source for sludge drying line, with good energy-saving effect and anticorrosive performance.

[0007] In order to realize the above-mentioned purpose, the utility model has adopted the following technical solutions:

[0008] An anticorrosive energy-saving system for sludge drying, comprising: a casing and a heat recovery unit, a temperature increasing unit and a sludge purification unit arranged in the casing; the casing is provided with a return air inlet and an air supply inlet; the heat recovery unit comprises a heat recovery heat exchanger, which comprises a pre-cooling part and a reheating part; the temperature increasing unit comprises a temperature increasing module, which comprises a first compressor, a first condenser, a first throttling valve and a first evaporator connected by copper pipes; the sludge purification unit comprises a low-temperature plasma purification assembly and an activated carbon purification assembly; the low-temperature plasma purification assembly comprises a low-temperature plasma generator; and the activated carbon purification assembly comprises an activated carbon adsorber.

[0009] The return air inlet is in communication with the air outlet of the sludge drying line, and the air supply inlet is in communication with the air inlet of the sludge drying line; the exhaust air of the sludge drying line passes through the return air inlet, the pre-cooling part, the low-temperature plasma purification assembly, the first evaporator, the activated carbon adsorber, the reheating part, the first condenser and the air supply inlet in sequence, is sent back to the sludge drying line after being dehumidified and warmed up, the pre-cooling part, the first evaporator, the reheating part and the first condenser are subjected to anticorrosion treatment, and a compressor cavity is arranged in the casing and is separately arranged from the path of the exhaust air of the sludge drying line.

[0010] Further, the activated carbon purification assembly further comprises an activated carbon desorption device.

[0011] Further, the activated carbon desorption device comprises a second compressor, a second condenser, a second throttling valve and a second evaporator connected by copper pipes, the second evaporator is arranged between the activated carbon adsorber and the reheating part, a bypass air duct is arranged in the casing, a bypass air valve is arranged at the air inlet of the bypass air duct, the second condenser is arranged in the bypass air duct, the activated carbon adsorber comprises two, namely a first activated carbon adsorber and a second activated carbon adsorber, a fresh air valve is arranged on the casing, the exhaust air of the sludge drying line passes through the return air inlet, the pre-cooling part, the low-temperature plasma purification assembly, the first evaporator and the first activated carbon adsorber in sequence, is mixed with fresh air, passes through the second evaporator, the reheating part and the first condenser, and then a part of the air is sent back to the sludge drying line through the air supply inlet, and the other part of the air is sent to the second activated carbon adsorber through the second condenser.

[0012] Further, the first activated carbon air duct and the second activated carbon air duct are arranged in the shell, the first main air inlet valve, the first main air outlet valve, the first bypass air inlet valve and the first bypass air outlet valve are arranged on the first activated carbon air duct in correspondence, the second main air inlet valve, the second main air outlet valve, the second bypass air inlet valve and the second bypass air outlet valve are arranged on the second activated carbon air duct in correspondence, the first activated carbon adsorber is arranged in the first activated carbon air duct, the second activated carbon adsorber is arranged in the second activated carbon air duct, the opening and closing states of the first main air inlet valve, the first main air outlet valve, the second bypass air inlet valve and the second bypass air outlet valve are consistent, and the opening and closing states of the second main air inlet valve, the second main air outlet valve, the first bypass air inlet valve and the first bypass air outlet valve are consistent.

[0013] Further, the second evaporator and the second condenser are subjected to corrosion prevention treatment.

[0014] Further, the first bypass air outlet valve and the second bypass air outlet valve are communicated with the catalytic combustion furnace.

[0015] Further, the air flow direction of the exhaust air of the sludge drying line when subjected to the adsorption treatment and the air flow direction of the exhaust air of the sludge drying line when subjected to the desorption treatment are opposite.

[0016] Further, the bypass air duct is provided with an auxiliary heating device.

[0017] Further, the heat recovery heat exchanger is a heat pipe type heat recovery device.

[0018] Further, the return air outlet is provided with an air filter.

[0019] The utility model discloses a shell and the heat recovery unit, the temperature increasing unit and the sludge purification unit of setting in the shell, be equipped with return air outlet and air supply outlet on the shell, the heat recovery unit includes precooling part and reheats the part, and the temperature increasing unit includes first compressor, first condenser, first throttle valve and first evaporator, and the sludge purification unit includes low temperature plasma purification subassembly and activated carbon purification subassembly, and the exhaust air of sludge drying line is in proper order through return air outlet, precooling part, low temperature plasma purification subassembly, first evaporator, activated carbon adsorber, reheats the part, first condenser, air supply outlet, and the wet air of sludge drying line is sent back after humidification and temperature increasing. The advantage that the anticorrosive energy -conserving system for sludge drying lies in: can recover the waste gas of sludge drying line, and the waste gas of sludge drying line is first through three -level temperature reduction and dehumidification, and is purified through low temperature plasma purification subassembly and activated carbon purification subassembly, and is then through two -level temperature increasing, and provides dry hot clean air heat source for sludge drying line, has good energy -conserving effect and anticorrosive performance. ACCURACY

[0020] Figure 1System principle schematic diagram for first embodiment of anti-corrosion energy-saving system for sludge drying;

[0021] Figure 2 System principle schematic diagram for second embodiment of anti-corrosion energy-saving system for sludge drying;

[0022] Figure 3 Top view of hidden outer shell top for third embodiment of anti-corrosion energy-saving system for sludge drying;

[0023] Figure 4 A-A cross-sectional view of Figure 3 ;

[0024] Figure 5 B-B cross-sectional view of Figure 3 ;

[0025] Figure 6 C-C cross-sectional view of Figure 3 . DETAILED DESCRIPTION

[0026] The utility model provides a kind of anti-corrosion energy-saving system for sludge drying, to make the purpose, technical scheme and effect of the utility model more clear, definite, the utility model is further explained in detail below with reference to drawing and example of implementation.It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0027] The utility model provides a kind of anti-corrosion energy-saving system for sludge drying, its structure as Figures 1-6 Shown, including: shell 1 and the heat recovery unit 2, temperature increasing unit 3 and sludge purification unit 4 being located in shell 1. Figure 1In the first embodiment shown, the casing 1 is provided with a return air inlet 11 and a supply air outlet 12. The heat recovery unit 2 comprises a heat recovery heat exchanger 21, which comprises a pre-cooling section 211 and a reheating section 212; the temperature increasing unit 3 comprises a temperature increasing module 31, which comprises a first compressor 311, a first condenser 312, a first throttling valve 313 and a first evaporator 314 connected by copper pipes, and a refrigerant circulates along the copper pipes in the first compressor 311, the first condenser 312, the first throttling valve 313 and the first evaporator 314. The first compressor 311 converts low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant. After the refrigerant reaches the first condenser 312, it transfers heat to the air passing through the first condenser 312, and the refrigerant is condensed into a liquid state. After passing through the first throttling valve 313, the refrigerant is throttled into low-pressure liquid refrigerant, and then absorbs heat from the air passing through the first evaporator 314, and the refrigerant is converted into low-temperature and low-pressure gaseous refrigerant, and returns to the first compressor 311 for continuous circulation. In this way, the temperature of the air passing through the first condenser 312 rises, and the temperature of the air passing through the first evaporator 314 decreases.

[0028] The sludge purification unit 4 comprises a low-temperature plasma purification assembly 41 and an activated carbon purification assembly 42. The low-temperature plasma purification assembly 41 comprises a low-temperature plasma generator, and the suitable ambient temperature of the low-temperature plasma generator is 40-60°C. The positive and negative ions generated by the low-temperature plasma generator simultaneously neutralize in the air, which releases a large amount of energy in an instant, thereby causing changes in the structure of bacteria around or energy conversion, resulting in the death of bacteria and achieving the sterilization effect. The activated carbon purification assembly 42 comprises an activated carbon adsorber 421, and the suitable working ambient temperature of the activated carbon adsorber 421 is 20-40°C. The activated carbon can effectively adsorb acidic or alkaline components in the exhaust gas.

[0029] The return air inlet 11 is in communication with the air outlet of the sludge drying line 5, and the supply air outlet 12 is in communication with the air inlet of the sludge drying line 5. The exhaust air of the sludge drying line 5 successively passes through the return air inlet 11, the pre-cooling section 211, the low-temperature plasma purification assembly 41, the first evaporator 314, the activated carbon adsorber 421, the reheating section 212, the first condenser 312, the supply air outlet 12, and is sent back to the sludge drying line 5 after being dehumidified and temperature-increased. The trajectory route of the exhaust air of the sludge drying line 5 is as shown in the figure. Figure 1The temperature of the exhaust air of the sludge drying line 5 is high when passing through the pre-cooling part 211, and is low after being cooled and dehumidified by the first evaporator 314, so that the high-temperature air passing through the pre-cooling part 211 and the low-temperature air passing through the reheating part 212 are heat-exchanged by the heat recovery heat exchanger 21, the air passing through the pre-cooling part 211 is cooled, and the air passing through the reheating part 212 is heated, so that the waste heat of the sludge drying line 5 is recovered, the exhaust air of the sludge drying line 5 is cooled and dehumidified, and the exhaust air is heated and then sent back to the sludge drying line 5 to perform the drying process, thereby achieving good energy-saving effect.

[0030] The pre-cooling part 211, the first evaporator 314, the reheating part 212 and the first condenser 312 are subjected to corrosion prevention treatment, and the compressor cavity 17 is arranged in the shell 1 and is separately arranged from the path of the exhaust air of the sludge drying line 5. The existing corrosion prevention treatment method is generally surface immersion coating of a corrosion prevention coating, but in order to ensure that the heat exchange efficiency of the heat exchanger is not excessively lost, the material and thickness of the corrosion prevention coating are required to be high, so that the corrosion prevention coating cannot completely prevent the corrosion of the heat exchanger, but can delay the corrosion of the heat exchanger. The first compressor 311 and the first throttling valve 313 and other components that do not need to be heat-exchanged with air are arranged in the compressor cavity 17, so that the corrosion of the first compressor 311 and the first throttling valve 313 and other components by the exhaust air of the sludge drying line 5 is effectively prevented.

[0031] The heat source provided by the corrosion prevention and energy-saving system for sludge drying provided by the utility model to the sludge drying line 5 is about 70 DEG C, the return air temperature of the system is about 60 DEG C, the exhaust air is preliminarily cooled and dehumidified by the pre-cooling part 211, the temperature of the exhaust air is reduced to about 40 DEG C, the exhaust air is sterilized by the low-temperature plasma generator, in this environment, the heat dissipation effect and sterilization effect of the low-temperature plasma generator are good, the exhaust air is further cooled and dehumidified by the first evaporator 314, the temperature of the exhaust air is reduced to about 30 DEG C, the acidic or alkaline substances in the exhaust air are adsorbed by the activated carbon adsorber 421, and the purified exhaust air is heated to about 70 DEG C by the reheating part 212 and the first condenser 312 and then sent to the sludge drying line 5 to continue drying the sludge. The corrosion prevention and energy-saving system for sludge drying provided by the utility model not only recovers the waste heat of the sludge drying line 5, but also recycles the waste heat of the sludge drying line 5, provides a high-temperature heat source for drying the sludge by using the heat pump technology, dehumidifies the waste heat, reduces the air humidity of the sludge drying line 5, has good energy-saving effect, improves the sludge drying efficiency, purifies the air passing through the system, reduces the corrosive substances in the air, makes the heat exchange components have good durability, and reduces the maintenance cost of the corrosion prevention and energy-saving system.

[0032] Specifically, as shown in FIG. 1, the system comprises a shell 1, a first compressor 311, a first throttling valve 313, a first evaporator 314, a first condenser 312, a pre-cooling part 211, a reheating part 212, a low-temperature plasma generator 313, an activated carbon adsorber 421 and a heat recovery heat exchanger 21. Figure 2In the second embodiment shown, the activated carbon purification assembly 42 further comprises an activated carbon desorption device 422. Since the harmful substances in the sludge generally have a high concentration, the activated carbon adsorber 421 needs to be replaced frequently. The used activated carbon adsorber 421 is desorbed by the activated carbon desorption device 422 to regenerate the activated carbon adsorber 421 for reuse, thereby effectively reducing the cost of the activated carbon adsorber 421.

[0033] Specifically, the activated carbon desorption device 422 comprises a second compressor 422a, a second condenser 422b, a second throttling valve 422c and a second evaporator 422d connected by copper pipes. The second evaporator 422d is arranged between the activated carbon adsorber 421 and the reheating part 212. A bypass air duct 13 is arranged in the casing 1. A bypass air valve 131 is arranged at the air inlet of the bypass air duct 13. The second condenser 422b is arranged in the bypass air duct 13. Two activated carbon adsorbers 421 are arranged, which are a first activated carbon adsorber 421a and a second activated carbon adsorber 421b. A fresh air valve 14 is arranged on the casing 1. The fresh air valve 14 can be arranged before the reheating part 212. In the anti-corrosion energy-saving system for sludge drying provided by the present application, the fresh air valve 14 is arranged between the first activated carbon adsorber 421a and the second evaporator 422d. The fresh air at a lower temperature is filtered and then enters the casing 1 to mix with the exhaust air of the sludge drying line 5 that has been cooled and treated. After being cooled and dehumidified by the second evaporator 422d, the fresh air enters the reheating part 212 to exchange heat with the exhaust air of the sludge drying line 5. That is, the trajectory of the fresh air is as shown in FIG. 4: C1→C2→C3. Figure 2 The exhaust air of the sludge drying line 5 passes through the return air inlet 11, the pre-cooling part 211, the low-temperature plasma purification assembly 41, the first evaporator 314 and the first activated carbon adsorber 421a in sequence, mixes with the fresh air, and then passes through the second evaporator 422d, the reheating part 212 and the first condenser 312. Part of the air is sent back to the sludge drying line 5 through the supply air inlet 12. The trajectory of the air is as shown in FIG. 5: B1→B2→B3→B4→B5→B6→B7. The other part of the air is sent to the second activated carbon adsorber 421b through the second condenser 422b. The trajectory of the air is as shown in FIG. 6: B1→B2→B3→B4→B5→B6→B8→B9. Figure 2 The exhaust air of the sludge drying line 5 passes through the return air inlet 11, the pre-cooling part 211, the low-temperature plasma purification assembly 41, the first evaporator 314 and the first activated carbon adsorber 421a in sequence, mixes with the fresh air, and then passes through the second evaporator 422d, the reheating part 212 and the first condenser 312. Part of the air is sent back to the sludge drying line 5 through the supply air inlet 12. The trajectory of the air is as shown in FIG. 5: B1→B2→B3→B4→B5→B6→B7. The other part of the air is sent to the second activated carbon adsorber 421b through the second condenser 422b. The trajectory of the air is as shown in FIG. 6: B1→B2→B3→B4→B5→B6→B8→B9. Figure 2 The exhaust air of the sludge drying line 5 passes through the return air inlet 11, the pre-cooling part 211, the low-temperature plasma purification assembly 41, the first evaporator 314 and the first activated carbon adsorber 421a in sequence, mixes with the fresh air, and then passes through the second evaporator 422d, the reheating part 212 and the first condenser 312. Part of the air is sent back to the sludge drying line 5 through the supply air inlet 12. The trajectory of the air is as shown in FIG. 5: B1→B2→B3→B4→B5→B6→B7. The other part of the air is sent to the second activated carbon adsorber 421b through the second condenser 422b. The trajectory of the air is as shown in FIG. 6: B1→B2→B3→B4→B5→B6→B8→B9.

[0034] When the second activated carbon adsorber 421b needs to be desorbed, the second compressor 422a is started, the bypass air valve 131 and the fresh air valve 14 are opened, and the refrigerant circulates in the system composed of the second compressor 422a, the second condenser 422b, the second throttling valve 422c and the second evaporator 422d connected by copper pipes. The refrigerant in the second condenser 422b releases heat, causing the temperature of the air passing through the second condenser 422b to rise. The refrigerant in the second evaporator 422d absorbs heat, causing the temperature of the air passing through the second evaporator 422d to drop. The exhaust air of the sludge drying line 5 passes through the pre-cooling part 211, the first evaporator 314 and the second evaporator 422d in turn for three-stage cooling and dehumidification, so that the moisture content of the air entering the sludge drying line 5 is very low, effectively improving the drying efficiency of the sludge drying line 5. Part of the air is reheated by the reheating part 212, the first condenser 312 and the second condenser 422b for three-stage heating, and then sent to the second activated carbon adsorber 421b for desorption treatment of the second activated carbon adsorber 421b. In this way, a high-temperature heat source can be provided for the sludge drying line 5, and a higher-temperature heat source can be provided for the second activated carbon adsorber 421b, so that the activated carbon of the second activated carbon adsorber 421b is regenerated, and the energy consumption of the activated carbon desorption device 422 is saved. In this way, the functions of the entire corrosion prevention and energy saving system are diversified, and the energy saving effect is better.

[0035] Specifically, after the first activated carbon adsorber 421a is used for a period of time, it is necessary to exchange the positions of the first activated carbon adsorber 421a and the second activated carbon adsorber 421b to desorb the first activated carbon adsorber 421a. In order to avoid this situation, as shown in the third embodiment, Figures 3-6 The third embodiment is shown. The inside of the shell 1 is divided into upper and lower structures. The shell 1 is provided with a first activated carbon air duct 15 and a second activated carbon air duct 16. The first activated carbon air duct 15 is correspondingly provided with a first main air inlet valve 151, a first main air outlet valve 152, a first bypass air inlet valve 153 and a first bypass air outlet valve 154. The second activated carbon air duct 16 is correspondingly provided with a second main air inlet valve 161, a second main air outlet valve 162, a second bypass air inlet valve 163 and a second bypass air outlet valve 164. The activated carbon adsorber 421 is provided with two, the first activated carbon adsorber 421a is in the first activated carbon air duct 15, and the second activated carbon adsorber 421b is in the second activated carbon air duct 16. The opening and closing states of the first main air inlet valve 151, the first main air outlet valve 152, the second bypass air inlet valve 163 and the second bypass air outlet valve 164 are consistent, and the opening and closing states of the second main air inlet valve 161, the second main air outlet valve 162, the first bypass air inlet valve 153 and the first bypass air outlet valve 154 are consistent. The opening and closing states of the first main air inlet valve 151 and the second main air inlet valve 161 are inconsistent when the corrosion prevention and energy saving system is working.

[0036] When the first activated carbon adsorber 421a in the first activated carbon duct 15 performs adsorption treatment and the second activated carbon adsorber 421b in the second activated carbon duct 16 performs desorption treatment, the first main inlet valve 151, the first main outlet valve 152, the second bypass inlet valve 163, and the second bypass outlet valve 164 are opened, and the second main inlet valve 161, the second main outlet valve 162, the first bypass inlet valve 153, and the second bypass outlet valve 154 are closed. Figures 3-6 As shown, the fresh air and the exhaust air from the sludge drying line 5 mix at F06 (E1). The trajectory of the fresh air is: E1→E2→E3. The trajectory of part of the exhaust air from the sludge drying line 5 is: F01→F02→F03→F04→F05→F06→F07→F08, which is returned to the sludge drying line 5. The trajectory of the other part of the exhaust air from the sludge drying line 5 is: F01→F02→F03→F04→F05→F06→F07→F09→F10→F11→F12→F13, which desorbs the second activated carbon adsorber 421b. When the first activated carbon adsorber 421a in the first activated carbon duct 15 is performing desorption treatment and the second activated carbon adsorber 421b in the second activated carbon duct 16 is performing adsorption treatment, the first main inlet valve 151, the first main outlet valve 152, the second bypass inlet valve 163, and the second bypass outlet valve 164 are closed, while the second main inlet valve 161, the second main outlet valve 162, the first bypass inlet valve 153, and the second bypass outlet valve 154 are opened. In this way, the opening and closing of each valve only needs to be controlled by the circuit, without changing the positions of the first activated carbon adsorber 421a and the second activated carbon adsorber 421b, thus reducing the maintenance time of the corrosion-resistant and energy-saving system.

[0037] Specifically, the second evaporator 422d and the second condenser 422b are treated with anti-corrosion coatings. The anti-corrosion treatment level of the precooling section 211 and the first evaporator 314 can be higher than that of the second evaporator 422d, the reheat section 212, the first condenser 312 and the second condenser 422b, so that all heat exchangers can provide sufficient heat exchange efficiency. The anti-corrosion and energy-saving system has good durability and reduces the cost of the anti-corrosion and energy-saving system.

[0038] Specifically, both the first bypass vent valve 154 and the second bypass vent valve 164 are connected to the catalytic combustion furnace 6. The catalytic combustion furnace 6 uses a catalyst to carry out an oxidation reaction, converting the desorbed high-concentration waste gas into carbon dioxide and water. The oxidized and decomposed waste gas is then discharged in compliance with emission standards. The first bypass vent valve 154 and the second bypass vent valve 164 can also be connected to other waste gas treatment devices to ensure that the waste gas is treated to meet emission standards before being discharged.

[0039] Specifically, the air flow direction through the activated carbon adsorber 421 when the exhaust air of the sludge drying line 5 is subjected to adsorption treatment is opposite to the air flow direction through the activated carbon adsorber 421 when the exhaust air of the sludge drying line 5 is subjected to desorption treatment. In this way, the desorption effect on the activated carbon adsorber 421 is enhanced, and the desorption efficiency of the activated carbon is improved.

[0040] Specifically, the bypass air duct 13 is provided with an auxiliary heating device 132. The suitable temperature for activated carbon desorption is 80-150 DEG C. The auxiliary heating device 132 can be an electric heating device or a heat exchanger recovering waste heat from the catalytic combustion furnace 6, so as to avoid the case that the air temperature reaching the activated carbon adsorber 421 for desorption is not enough in a low-temperature environment, and ensure that the activated carbon desorption is more complete.

[0041] Specifically, the heat recovery heat exchanger 21 is a heat pipe type heat recovery device. One end of the heat pipe type heat recovery device is an evaporation section, and the other end is a condensation section. When one end of the heat pipe type heat recovery device is heated, the liquid rapidly evaporates, the steam flows to the other end under the action of a small pressure difference, and releases heat in the condensation section to re-condense into liquid. The liquid flows back to the evaporation end along the porous material by capillary action and gravity, and circulates in this way, so that heat can be continuously transferred. The heat pipe type heat recovery device has the advantages of small size, high heat exchange efficiency, convenient maintenance, etc.

[0042] Specifically, the air filter 18 is arranged at the return air inlet 11, and the air filter 18 adopts a primary and medium efficiency composite filter group, which can filter the solid particulate matters in the exhaust air of the sludge drying line 5, and effectively reduces the corrosion effect of the exhaust air of the sludge drying line 5 on the corrosion-resistant and energy-saving system.

[0043] In summary, the utility model discloses a shell and the heat recovery unit, the temperature increasing unit and the sludge purification unit of being arranged in the shell, the shell is equipped with the return air inlet and the air supply inlet, the heat recovery unit includes the precooling part and the reheating part, the temperature increasing unit includes the first compressor, the first condenser, the first throttling valve and the first evaporator, and the sludge purification unit includes the low temperature plasma purification assembly and the activated carbon purification assembly, and the exhaust air of sludge drying line is in turn through the return air inlet, the precooling part, the low temperature plasma purification assembly, the first evaporator, the activated carbon adsorber, the reheating part, the first condenser, the air supply inlet, and is sent back to the sludge drying line after dehumidification and temperature increasing. The corrosion-resistant and energy-saving system for sludge drying has the advantages that the exhaust air of the sludge drying line can be recovered, the exhaust air of the sludge drying line is subjected to three-stage temperature reduction and dehumidification, purification through the low temperature plasma purification assembly and the activated carbon purification assembly, and two-stage temperature increasing, so as to provide dry, clean and hot air source for the sludge drying line, and has good energy-saving effect and corrosion-resistant performance.

[0044] It should be understood that modifications or variations can be made according to the above description by those of ordinary skill in the art, and all such modifications and variations are intended to be within the scope of the present application as defined by the claims appended hereto.

Claims

1. A corrosion-proof energy saving system for drying sludge, characterized in that, The utility model relates to a kind of sludge drying system, including: Casing and heat recovery unit, temperature increasing unit and sludge purification unit arranged in casing; Said casing is equipped with return air inlet and air supply inlet; The heat recovery unit includes heat recovery heat exchanger, and the heat recovery heat exchanger includes precooling part and reheating part; The temperature increasing unit includes temperature increasing module, and the temperature increasing module includes first compressor, first condenser, first throttling valve and first evaporator connected by copper pipe; The sludge purification unit includes low-temperature plasma purification assembly and activated carbon purification assembly, and the low-temperature plasma purification assembly includes low-temperature plasma generator, and the activated carbon purification assembly includes activated carbon adsorber; The return air inlet is communicated with the air outlet of sludge drying line, and the air supply inlet is communicated with the air inlet of sludge drying line, and the exhaust air of sludge drying line passes through return air inlet, precooling part, low-temperature plasma purification assembly, first evaporator, activated carbon adsorber, reheating part, first condenser and air supply inlet in sequence, and is sent back to sludge drying line after dehumidification and temperature increasing, and precooling part, first evaporator, reheating part and first condenser are treated with anticorrosion, and compressor cavity is arranged in casing, and compressor cavity is arranged separately from the path of exhaust air of sludge drying line.

2. A corrosion-proof energy-saving system for drying sludge as claimed in claim 1, wherein: The activated carbon purification assembly further includes activated carbon desorption device.

3. A corrosion-proof energy-saving system for drying sludge as claimed in claim 2, wherein: The activated carbon desorption device includes second compressor, second condenser, second throttling valve and second evaporator connected by copper pipe, and the second evaporator is arranged between activated carbon adsorber and reheating part, and bypass air duct is arranged in casing, bypass air valve is arranged at air inlet of bypass air duct, and second condenser is arranged in bypass air duct, and activated carbon adsorber is provided with two, which are first activated carbon adsorber and second activated carbon adsorber, and air valve is arranged on casing, and the exhaust air of sludge drying line passes through return air inlet, precooling part, low-temperature plasma purification assembly, first evaporator and first activated carbon adsorber in sequence, and is mixed with fresh air, and after passing through second evaporator, reheating part and first condenser, part of air is sent back to sludge drying line through air supply inlet, and the other part of air is sent to second activated carbon adsorber through second condenser.

4. A corrosion-proof energy-saving system for drying sludge as claimed in claim 3, wherein: First activated carbon air duct and second activated carbon air duct are arranged in casing, first main air inlet valve, first main air outlet valve, first bypass air inlet valve and first bypass air outlet valve are arranged on first activated carbon air duct correspondingly, second main air inlet valve, second main air outlet valve, second bypass air inlet valve and second bypass air outlet valve are arranged on second activated carbon air duct correspondingly, first activated carbon adsorber is arranged in first activated carbon air duct, and second activated carbon adsorber is arranged in second activated carbon air duct, and the opening and closing states of first main air inlet valve, first main air outlet valve, second bypass air inlet valve and second bypass air outlet valve are consistent, and the opening and closing states of second main air inlet valve, second main air outlet valve, first bypass air inlet valve and first bypass air outlet valve are consistent.

5. A corrosion-proof energy-saving system for drying sludge as claimed in claim 4, wherein: The second evaporator and second condenser are treated with anticorrosion.

6. A corrosion-proof energy-saving system for drying sludge as claimed in claim 4, wherein: The first bypass air outlet valve and the second bypass air outlet valve are communicated with catalytic combustion furnace.

7. A corrosion-proof energy-saving system for drying sludge as claimed in claim 4 wherein: The air direction of the sludge drying line exhaust air treated by adsorption is opposite to the air direction of the sludge drying line exhaust air treated by desorption.

8. A corrosion-proof energy-saving system for drying sludge as claimed in claim 4 wherein: The bypass air duct is provided with an auxiliary heating device.

9. A corrosion-proof energy-saving system for drying sludge as claimed in claim 1, wherein: The heat recovery heat exchanger is a heat pipe type heat recovery device.

10. A corrosion-proof energy saving system for drying sludge as claimed in claim 1 wherein: An air filter is arranged at the return air outlet.

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