Energy-saving sludge reduction system and method

Abstract

The application discloses an energy-saving sludge reduction system and method, which comprises a sludge continuous mechanical deep dehydration unit, a preheating and molding unit, a belt drying unit, a dust removal unit, a circulating fan unit, a quenching and heating unit, a heat pump unit and a solar water heating unit. The sludge continuous mechanical deep dehydration unit and the preheating and molding unit are used for sludge reduction pretreatment and molding preheating. After the tail water of sewage treatment reaching the standard is preheated by the solar water heating unit, the tail water enters the heat pump unit. The water source heat pump unit provides corresponding heat input and cold input for the belt drying unit in the heating and condensation links. The automatic control valve, the air temperature and humidity online monitoring control and the fan are connected on the connecting pipeline of the drying carrier gas quenching and heating unit, so that the air is fully condensed and heated, the carbon emission and energy consumption in the sludge heating and drying are reduced, and the operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sludge treatment, and particularly relates to an energy-saving sludge reduction system and method. BACKGROUND

[0002] The continuous operation of a sewage treatment plant produces sludge, and under the current environmental protection requirements and disposal cost pressure, the sewage treatment plant needs to further reduce the sludge before the final disposal, on the basis of the sludge delivery moisture content of 80%, to reduce the transportation environmental pressure and the transportation and disposal cost.

[0003] The conventional sludge deep reduction treatment includes mechanical deep dewatering, drying treatment, etc., in which:

[0004] a. The water in the sludge usually exists in the form of interstitial water (about 70%), capillary water (about 20%), adsorbed water (less than 10%), and bound water (less than 10%). The mechanical extrusion dewatering can remove part of the interstitial water, and the energy consumption is relatively low, but if more water needs to be further removed, the effect of the mechanical extrusion dewatering is subject to the characteristics of the sludge itself and the difference in dewatering performance, and it is usually difficult to stably achieve a moisture content of less than 60%, so further removal of water needs to heat the sludge for drying.

[0005] b. The heating drying treatment has a good deep reduction effect, and basically can reduce the sludge to a moisture content of less than 40%. If the water between the moisture contents of 80% and 40% is directly removed by the conventional heating drying method, due to the latent heat of vaporization of water of about 2200 KJ / kg, the energy consumption of the sludge heating drying is high, and a high-quality heat source (such as superheated steam) is needed in the surrounding area, and the surrounding conditions of most sewage treatment plants are difficult to meet.

[0006] c. The low-temperature drying equipment can use a low-quality heat source to heat and dry the sludge, and the deficiencies of the low-temperature drying equipment currently used in the market are as follows: 1. The air source heat pump form is used to convert the electric energy into heat energy to dry the sludge, but the performance stability is poor due to the climate change in different regions and the temperature change in different seasons, a cooling tower system needs to be equipped to treat the waste heat, causing heat loss; 2. The operation easily produces odor and dust, which adversely affects the working environment and causes corrosion and performance degradation of the drying equipment; 3. The electric load is high, the operation cost is high, and the carbon emission benefit is poor.

[0007] The effluent of a sewage treatment plant is continuously discharged for 24 hours a day, the water temperature is relatively stable, and a large amount of waste heat resources are contained. The effluent quality can meet the limit requirements of "Urban Sewage Heat Pump Heat Energy Utilization Water Quality" (CJ / T 337-2010) and "Urban Sewage Reuse Industrial Water Quality" (GB / T 19923-2005). The area where the conventional sewage treatment plant is located also has certain solar energy resource utilization conditions. The water source heat pump technology can integrate and fully utilize the renewable energy in the area where the sewage plant is located by combining with the solar hot water technology, so as to provide stable heat source conditions for the deep reduction treatment of sludge in the sewage treatment plant, and realize efficient recycling of resources and energy in the sewage treatment plant. However, at present, the water source heat pump for producing hot water is mainly used for heating, and the conventional heating water temperature is generally not more than 50 DEG C. The cold source by-product produced when the water source heat pump produces hot water is usually not fully utilized and wasted. SUMMARY

[0008] Therefore, the purpose of the present application is to provide an energy-saving sludge reduction system and method to solve the problems in the prior art.

[0009] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0010] On the one hand, an energy-saving sludge reduction system is provided, which comprises a sludge continuous mechanical deep dewatering unit, a preheating and molding unit, a belt drying unit, a dust removal unit, a circulating fan unit, a quenching and heating unit, a heat pump unit and a solar hot water unit. The sludge continuous mechanical deep dewatering unit, the preheating and molding unit and the belt drying unit are connected in sequence. The dust removal unit, the circulating fan unit and the quenching and heating unit are connected in sequence. The belt drying unit is connected with the dust removal unit, the circulating fan unit and the quenching and heating unit respectively. The heat pump unit is connected with the dust removal unit, the circulating fan unit and the quenching and heating unit respectively. The solar hot water unit is connected with the heat pump unit. The heat pump unit obtains heat source water and cold source water from the tail water treated by the sewage treatment plant.

[0011] In the energy-saving sludge reduction system, the quenching and heating unit comprises a carrier gas quenching condenser and a carrier gas heating heat exchanger. The cold source water outlet end of the heat pump unit is connected with the carrier gas quenching condenser. The carrier gas quenching condenser is connected with a sewage treatment plant tail water discharge pipeline and a flushing water interface of the sludge continuous mechanical deep dewatering unit.

[0012] As the energy-saving sludge reduction system, wherein, further comprising a deodorization unit, the deodorization unit is connected with the belt drying unit through the dust removal unit, a first automatic control valve is installed on the connecting pipeline between the dust removal unit and the deodorization unit, the deodorization unit comprises an online odor concentration detection device, the online odor concentration detection device controls the first automatic control valve, and when the online odor concentration detection device detects that the odor concentration in the carrier gas reaches a preset threshold value, the first automatic control valve is opened.

[0013] As the energy-saving sludge reduction system, wherein, a second automatic control valve and an air temperature and humidity online monitoring device are arranged on the connecting pipeline of the quenching and heating unit, the quenching and heating unit adjusts the valve opening degree of the second automatic control valve and the operation frequency of the fan in the circulating fan unit by detecting the temperature and humidity parameters of the air after quenching and condensation and the carrier gas after heating, so as to control the air flow rate in the system.

[0014] As the energy-saving sludge reduction system, wherein, the dust removal unit is connected with the inlet of the feed conditioner of the sludge continuous mechanical deep dewatering unit.

[0015] In another aspect, an energy-saving sludge reduction method is provided, wherein the method is realized based on the energy-saving sludge reduction system according to any one of the embodiments, and comprises the following steps:

[0016] S1, the dewatered sludge in a sewage treatment plant is mechanically extruded by a sludge continuous mechanical deep dewatering unit, and deep dewatered sludge is obtained by a low-energy-consumption method;

[0017] S2, the deep dewatered sludge is shaped by a preheating and shaping unit, so that sludge embryos with uniform size and more favorable water evaporation are formed, and the sludge embryos are preheated;

[0018] S3, the sewage treatment standard tail water is preheated by a solar water heating unit and then enters a heat pump unit, so that heat source water and cold source water are generated, the heat source water and the cold source water enter a quenching and heating unit, and unsaturated hot air carrying a small amount of water vapor is formed and enters a belt drying unit;

[0019] S4, the belt drying unit heats and dries the preheated sludge embryos, dust particles in the carrier gas are removed by a dust removal unit, and the carrier gas is reused as a skeleton agent for improving the dewatering performance of the sludge continuous mechanical deep dewatering unit; the condensed water formed by quenching the carrier gas by using the cold source water is used for equipment flushing of the sludge continuous mechanical deep dewatering unit, and finally the reduced and dried sludge after heating and drying is transported and transported to subsequent facilities for further treatment and disposal through a dried sludge transportation unit.

[0020] The beneficial effects of the technical scheme of the present application are as follows:

[0021] 1. While reducing energy consumption, using renewable energy such as waste heat resources from the effluent of the sewage treatment plant to create renewable heat source conditions for the sewage sludge drying treatment in the sewage treatment plant;

[0022] 2. On the basis of the existing system, reduce the energy consumption of sludge drying treatment, while avoiding dust production, and also fully recycle the condensate wastewater and dust produced by the system, to realize the improvement of the comprehensive effect of the system;

[0023] 3. By water source heat pump, heat source and cold source are extracted from the tail water of sewage treatment plant, to provide corresponding heat input and cold input for the heating and condensing links of the drying system, breaking the condition restriction that sludge heating drying treatment needs to rely on high-quality heat sources such as steam and different environmental temperature influences on system efficiency, to provide conditions for realizing distributed sludge heating drying;

[0024] 4. The water source heat pump has higher efficiency and stability than the air source heat pump, which can reduce carbon emissions and energy consumption in sludge heating drying, and reduce operating costs. BRIEF DESCRIPTION OF DRAWINGS

[0025] To further illustrate the above-mentioned purposes, structural characteristics and effects of the present application, the present application will be described in detail below in conjunction with the drawings.

[0026] Figure 1 The figure is a schematic block diagram of the system structure of the preferred embodiment of the present application.

[0027] In the figure: 1, sludge continuous mechanical deep dewatering unit; 2, preheating and molding unit; 3, belt drying unit; 4, dust removal unit; 5, circulating fan unit; 6, heat pump unit; 7, solar hot water unit; 8, carrier gas quenching condenser; 9, carrier gas heating heat exchanger; 10, deodorizing unit; 11, first automatic control valve; 12, second automatic control valve; 13, air temperature and humidity online monitoring device. DETAILED DESCRIPTION

[0028] The terms "invention" and "the present invention" as used in this specification are intended to refer broadly to all of the subject matter of this specification and any patent claims below. Statements regarding the scope of the application made in this specification are not meant to be limiting and are intended to be interpreted broadly. The statements are intended to be construed in a manner consistent with the broadest interpretation of the claims. Also, the description of the present application is not intended to limit the scope of the claims to any specific aspect or aspect described herein. The subject matter should be interpreted in the broadest scope and meaning of the claims. The present application can have other embodiments and be practiced or carried out in other ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.

[0029] The details of the application will now be discussed with reference to the accompanying drawings which illustrate the application by way of example only. In the drawings, like features or components can be marked with the same reference numerals.

[0030] The use of "including", "having" "containing" and "comprising" and variations thereof herein are meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Although the terms above such as upper, lower, upward, downward, rearward, frontward, back, forth, forward, rearward, top, bottom, left, right, front, rear, etc. can be used in this disclosure, such a term is made for ease of description by referring to the figures by way of example and not limitation. The orientation of such descriptions is not intended to limit or restrict the application to any particular spatial arrangement. Moreover, terms such as first, second, third, etc. are used herein for purposes of description and not of limitation.

[0031] Referring to Figure 1 As shown, the energy-saving sludge reduction system of the application comprises a sludge continuous mechanical deep dewatering unit 1, a preheating and molding unit 2, a belt drying unit 3, a dust removal unit 4, a circulating fan unit 5, a quenching and heating unit, a heat pump unit 6, and a solar water heating unit 7. The sludge continuous mechanical deep dewatering unit 1, the preheating and molding unit 2, and the belt drying unit 3 are connected in sequence. The dust removal unit 4, the circulating fan unit 5, and the quenching and heating unit are connected in sequence. The belt drying unit 3 is connected to the dust removal unit 4, the circulating fan unit 5, and the quenching and heating unit, respectively. The heat pump unit 6 is connected to the dust removal unit 4, the circulating fan unit 5, and the quenching and heating unit, respectively. The solar water heating unit 7 is connected to the heat pump unit 6. The heat pump unit 6 obtains heat source water and cold source water from the tail water treated to standard in a sewage treatment plant.

[0032] The sludge continuous mechanical deep dewatering unit 1 is used to further reduce the dewatered sludge from the sewage treatment plant by mechanical extrusion. The water content of the sludge is reduced from about 80% to about 60-65%. The water carried by the sludge entering the drying unit is reduced. Compared with 1 ton of sludge with a water content of 80% directly entering the sludge drying system, the same amount of sludge first undergoes mechanical deep reduction, reducing about 57-62.5% of the evaporative water, and directly saving 57-62.5% of the heat consumption in the heating and drying section.

[0033] The preheating and molding unit 2 is used to mold the deep dewatered sludge. For sludge with different organic matter contents, combined with test data, a uniform size of about 5-10 cm and a thickness of about 5 mm is formed by the molding mechanism to ensure that the sludge embryo is uniformly heated and avoid part of the sludge being overheated and becoming dust. At the same time, the sludge embryo is preheated. The embryo is preheated to about 50°C and then enters the belt drying unit 3. Compared with sludge that is not molded and preheated, the amount of sludge dust is reduced by at least about 80%, greatly reducing the failure rate of the system air circulation, heating, and condensing system and the attenuation of heat exchange effect.

[0034] Further, continuing to refer to Figure 1 As shown, the quenching and heating unit includes a carrier gas quenching condenser 8 and a carrier gas heating heat exchanger 9. The cold source water outlet of the heat pump unit 6 is connected to the carrier gas quenching condenser 8, and the carrier gas is quenched and condensed by the cold source water at about 10-15°C in summer and about 3-5°C in winter. The carrier gas quenching condenser 8 is connected to the sewage treatment plant standard tail water discharge pipeline, and the cold source water can effectively avoid reaching the freezing point in winter after absorbing heat to increase the temperature, and the water quality does not change, which can be discharged through the discharge pipeline. The tail water inlet of the heat pump unit 6 is connected to the sewage treatment plant standard discharge tail water pipeline and the solar water heating unit 7. The temperature of the sewage treatment standard tail water is usually about 25-30°C in summer and 8-10°C in winter. After preheating by the solar water heating unit 7, the temperature is increased by about 20°C, and the water enters the heat pump unit 6. The specific heat capacity of water is 4186 J / kg·°C, and the specific heat capacity of air is about 1.007 KJ / kg·°C. Ten thousand or even hundreds of thousands of cubic meters of stable sewage treatment plant reclaimed water can provide sufficient and stable heat source for the heat pump unit every day. The solar water heating unit 7 further collects solar energy within the plant area and sends it to the heat pump unit heat source system. The preheating by the solar water heating unit 7 can increase the energy efficiency ratio of the water source heat pump by at least 30%.

[0035] The main component of the dried carrier gas is air. Fresh outdoor air is mixed with part of the circulating carrier gas to form the carrier gas. After passing through the carrier gas quenching condenser 8, the temperature of the air is reduced, and the water vapor carried by the carrier gas forms condensed water which is collected. The water content in the condensed air is relatively low, and the humidity of 15°C saturated wet air is 13.5 g water / m 3 wet air. After passing through the carrier gas heating heat exchanger 9, the air becomes unsaturated hot air which enters the belt drying unit 3 to form about 80°C unsaturated hot air with a humidity of 13.5 g water / m 3 wet air. Compared with 80°C saturated wet air with a humidity of 379 g water / m 3 wet air, the air has a stable and strong dehumidification capacity, heats the sludge embryo, and carries away water vapor to realize the drying of the sludge embryo. The carrier gas leaving the belt drying unit 3 first passes through the dust removal unit 4 to remove dust particles, and then is transported by the fan for quenching and condensation-heating-drying circulation. Through this circulation, the sludge drying system is not affected by the temperature and humidity of the local environment (such as high air humidity in southern China and dry air in northern China), forming stable drying carrier gas inlet temperature and humidity conditions, and ensuring the stability and reliability of the system.

[0036] The tail water of the sewage treatment plant preheated by the solar hot water unit 7 is further extracted heat by the heat pump unit 6 to produce heat source water, and the temperature of the produced hot water is about 80-85℃, and the temperature of the tail water after energy extraction is reduced to form cold source water, which is about 10-15℃ in summer and about 3-5℃ in winter. The cold source water is used for condensing the drying carrier gas to condense and dehumidify the water vapor in the circulating carrier gas and the fresh air. The heat source water is used for heating the carrier gas after condensation to reduce humidity to form unsaturated hot air into the belt drying unit 3. The COP of the air source heat pump is usually about 3 (equivalent to 1 / 3 KW of work for carrying 1 KW of heat), and the COP further decreases in winter. The COP of the sewage plant tail water source heat pump can reach about 4 (equivalent to 1 / 4 KW of work for carrying 1 KW of heat), and due to the characteristics of large tail water flow, small temperature fluctuation, and high water temperature in winter, the water source heat pump has a higher COP than the air source heat pump in winter.

[0037] In the preferred embodiment, the system further comprises a deodorization unit 10 connected to the belt drying unit 3 through the dust removal unit 4. A first automatic control valve 11 is installed on the connecting pipeline between the dust removal unit 4 and the deodorization unit 10. The deodorization unit 10 comprises an online odor concentration detection device, which controls the first automatic control valve 11. When the online odor concentration detection device detects that the odor concentration in the carrier gas reaches a preset threshold, the first automatic control valve 11 is opened to control about 50% of the carrier gas to enter the deodorization unit 10 for deodorization treatment, and at the same time, an outdoor fresh air supplement valve is opened to supplement about 50% of the outdoor fresh air without odor pollutants as the carrier gas.

[0038] Further, a second automatic control valve 12 and an air temperature and humidity online monitoring device 13 are provided on the connecting pipeline of the quenching and heating unit. The quenching and heating unit is connected to the circulating fan unit 5, and the valve opening and the fan operating frequency in the circulating fan unit are adjusted and controlled by detecting the temperature and humidity parameters of the air after quenching and condensation and the carrier gas after heating, so as to control the air flow rate in the system. For example, if the temperature is lower than the preset 85℃ and the humidity is higher than the preset 13.5g water / m 3 The fan operating frequency is reduced, the carrier gas flow rate is slowed down, the heating water source and the quenching condensation water source flow rate remain unchanged, and the circulating carrier gas is fully condensed and heated.

[0039] The cold source water outlet end of the heat pump unit 6 is connected with the carrier gas quenching condenser 8 and the sewage treatment plant standard tail water discharge pipeline. The cold source water generated by the heat source of the heat pump unit is used as the cooling water source of the carrier gas quenching condenser 8, the cooling water source temperature is significantly lower than the air temperature, and has a large heat capacity to take away heat. Compared with the cooling water supply temperature of about 30 DEG C of the conventional air convection cooling tower circulating water in summer, the carrier gas condensing effect can be significantly improved. At the same time, the temperature of the cold source water after absorbing heat is slightly increased, which can ensure that it is higher than the freezing point of water 0 DEG C, and the flowability of the cold source water re-entering the sewage treatment plant standard tail water discharge pipeline in winter is ensured. The system only extracts the heat of the standard tail water of the sewage treatment plant, and does not change the water quality and quality, and does not affect the environmental protection standard discharge of the tail water of the sewage plant.

[0040] Further, the carrier gas quenching condenser 8 is connected with the flushing water interface of the sludge continuous mechanical deep dewatering unit 1. The carrier gas condensing water is mainly the water formed by the condensation of dewatering steam, and the water quality is good, which can be used as the continuous operation flushing water source of the sludge continuous mechanical deep dewatering unit 1. The dust removal unit 4 is also connected with the feed conditioning agent inlet end of the sludge continuous mechanical deep dewatering unit 1. The dry sludge dust can be used as the skeleton agent for improving the dewatering performance of the sludge continuous mechanical deep dewatering unit 1. If about 5% to 10% of the skeleton agent is used in the mechanical extrusion process, the stress of the sludge extrusion dewatering can be improved, and the water discharge channel can be ensured. Compared with the conventional lime and fly ash skeleton agent, the dry sludge dust reused as the skeleton agent for mechanical extrusion will not change the nature of the sludge, and will not affect the further disposal and utilization of the reduced sludge.

[0041] The application also provides an energy-saving sludge reduction method, which utilizes the above-mentioned energy-saving sludge reduction system for drying, and the specific steps include the following:

[0042] S1, the dewatered sludge of the sewage treatment plant is mechanically extruded through the sludge continuous mechanical deep dewatering unit 1, and the deep dewatered sludge is obtained by low energy consumption, so as to reduce the overall sludge drying energy consumption;

[0043] S2, the deep dewatered sludge is shaped by the preheating and shaping unit 2, so as to form sludge embryos which are uniform in size and more beneficial to water evaporation, and the sludge embryos are preheated;

[0044] S3, the solar water heating unit 7 is utilized to preheat the standard tail water of the sewage treatment plant, and then the standard tail water enters the heat pump unit 6 to generate heat source water and cold source water. The heat source water and the cold source water enter the quenching and heating unit to form unsaturated hot air carrying a small amount of water vapor, which enters the belt drying unit 3;

[0045] S4, the belt drying unit 3 carries out heating and drying treatment on the preheated sludge embryo, the dust particles in the drying carrier gas are removed through the dust removal unit 4, and the carrier gas is reused as a skeleton agent for improving the dehydration performance of the sludge continuous mechanical deep dewatering unit 1; the carrier gas is used as condensed water formed by rapid cooling using cold source water to flush the equipment of the sludge continuous mechanical deep dewatering unit 1, and finally the reduced and dried sludge after heating and drying is transported and transported out through the dried sludge transportation and transportation equipment and transported to subsequent facilities for further treatment and disposal.

[0046] The above merely describes the preferred embodiments of the present application, and is not intended to limit the embodiments and protection scope of the present application. It should be understood by those skilled in the art that any equivalent replacement and obvious change made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. An energy-saving sludge reduction system, characterized in that, The system comprises a sludge continuous mechanical deep dewatering unit, a preheating and shaping unit, a belt drying unit, a dust removal unit, a circulating fan unit, a quenching and heating unit, a heat pump unit and a solar water heating unit. The sludge continuous mechanical deep dewatering unit, the preheating and shaping unit and the belt drying unit are sequentially connected. The dust removal unit, the circulating fan unit and the quenching and heating unit are sequentially connected. The belt drying unit is connected with the dust removal unit, the circulating fan unit and the quenching and heating unit respectively. The heat pump unit is connected with the dust removal unit, the circulating fan unit and the quenching and heating unit respectively. The solar water heating unit is connected with the heat pump unit. The heat pump unit obtains heat source water and cold source water from tail water treated by a sewage treatment plant. The tail water of the sewage treatment plant preheated by the solar water heating unit is used to produce heat source water by the heat pump unit. The temperature of the tail water after energy extraction is reduced to form cold source water. The cold source water is used to condense the drying carrier gas, condense and dehumidify the water vapor in the circulating carrier gas and the fresh air, heat the carrier gas after condensation to reduce humidity, and form unsaturated hot air into the belt drying unit. The preheating and shaping unit is used to shape the deep dewatered sludge into a uniform size of 5-10 cm and a thickness of 5 mm, and heat to 50 DEG C.

2. The energy-saving sludge reduction system according to claim 1, wherein The quenching and heating unit comprises a carrier gas quenching condenser and a carrier gas heating heat exchanger. The cold source water outlet end of the heat pump unit is connected with the carrier gas quenching condenser. The carrier gas quenching condenser is connected with a sewage treatment plant tail water discharge pipeline and a flushing water interface of the sludge continuous mechanical deep dewatering unit.

3. The energy-saving sludge reduction system according to claim 1, wherein The system further comprises a deodorization unit. The deodorization unit is connected with the belt drying unit through the dust removal unit. A first automatic control valve is installed on the connecting pipeline between the dust removal unit and the deodorization unit. The deodorization unit comprises an online odor concentration detection device. The online odor concentration detection device controls the first automatic control valve. When the online odor concentration detection device detects that the odor concentration in the carrier gas reaches a preset threshold, the first automatic control valve is opened.

4. The energy-saving sludge reduction system according to claim 1, wherein A second automatic control valve and an air temperature and humidity online monitoring device are arranged on the connecting pipeline of the quenching and heating unit. The quenching and heating unit detects the temperature and humidity parameters of the air after quenching condensation and the carrier gas after heating, and adjusts the valve opening of the second automatic control valve and the operating frequency of the fan in the circulating fan unit, so as to control the air flow rate in the system.

5. The energy-saving sludge reduction system according to claim 1, wherein The dust removal unit is connected with the feed conditioner import end of the sludge continuous mechanical deep dewatering unit.

6. An energy-saving sludge reduction method, characterized by, The energy-saving sludge reduction system is realized by the following steps: S1, the sludge continuous mechanical deep dewatering unit is used to mechanically extrude the dewatered sludge in a sewage treatment plant to obtain deep dewatered sludge by low energy consumption; S2, the preheating and shaping unit is used to shape the deep dewatered sludge into a uniform size sludge embryo, which is more conducive to water evaporation, and preheat the sludge embryo; S3, the sewage treatment standard tail water is preheated by the solar water heating unit and then enters the heat pump unit to generate heat source water and cold source water, the heat source water and the cold source water enter the quenching and heating unit to form unsaturated hot air carrying a small amount of water vapor to enter the belt drying unit; S4, the belt drying unit heats and dries the preheated sludge embryo, the drying carrier gas removes dust particles through the dust removal unit and is reused as a skeleton agent for improving the dewatering performance of the sludge continuous mechanical deep dewatering unit; the carrier gas is quenched by the cold source water to form condensed water which is used for equipment flushing of the sludge continuous mechanical deep dewatering unit, and the reduced and dried sludge is finally transported and exported through the dried sludge transportation and export unit and transported to subsequent facilities for further treatment and disposal.

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