Sludge drying system

Abstract

The utility model discloses a sludge drying system which is characterized in that when the sludge drying system is used, steam is introduced into a sludge drying machine, a steam-water mixture generated by drying sludge by the sludge drying machine enters a drain valve group through a material inlet, first-stage steam condensed water is separated out, the first-stage steam condensed water and waste gas enter a first heat exchanger, and the waste gas enters a second heat exchanger; the first-stage steam condensation water is cooled into second-stage steam condensation water, the second-stage steam condensation water enters a second heat exchanger through a second water outlet and exchanges heat with carrier gas, the second-stage steam condensation water is cooled into third-stage steam condensation water, and the carrier gas at the temperature of 20 DEG C is heated into high-temperature carrier gas at the temperature of 95 DEG C; high-temperature carrier gas enters the sludge drying machine through a carrier gas outlet of the second heat exchanger and a carrier gas inlet of the sludge drying machine, so that the temperature of the carrier gas entering the sludge drying machine can be increased, the temperature difference between the carrier gas entering the sludge drying machine and waste gas is reduced, the steam consumption of the sludge drying machine is reduced, and the sludge drying efficiency is improved. Therefore, the energy utilization rate in the sludge drying process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying equipment, in particular to a sludge drying system. Background Art

[0002] Sludge has the characteristics of high moisture content, high ash content and low calorific value. Independent sludge incineration has certain requirements for the calorific value of sludge. At present, the sludge moisture content is mainly reduced to 40% through thermal drying and then co-incinerated. This disposal method can not only achieve the "reduction, stabilization, resource utilization and harmlessness" of sludge, but also utilize the steam heat source of the waste power plant, share the flue gas treatment and sewage treatment systems, realize the sharing of facilities and equipment, and save land and treatment costs.

[0003] The carrier gas of the drying system in the prior art usually uses ambient air at about 20°C, and the temperature of the exhausted drying exhaust gas is about 100°C. This part of the temperature rise uses the heat of the steam in the dryer, causing a large amount of heat loss and serious energy waste.

[0004] Therefore, how to improve the energy utilization rate in the sludge drying process is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a sludge drying system to improve the energy utilization rate in the sludge drying process;

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A sludge drying system comprises a sludge drying machine, a steam trap group, a first heat exchanger and a second heat exchanger, wherein:

[0008] The sludge dryer is provided with a discharge port, a carrier gas inlet and a first exhaust gas outlet, the steam trap group is provided with an inlet and a first water outlet, the first heat exchanger is provided with a first water inlet, a first exhaust gas inlet and a second water outlet, and the second heat exchanger is provided with a second water inlet, a second air inlet and a carrier gas outlet;

[0009] The discharge port of the sludge dryer is connected to the inlet of the steam trap group, and the steam trap group is used to separate the primary steam condensate from the steam-water mixture discharged from the discharge port;

[0010] The first water outlet is connected to the first water inlet, the first exhaust gas outlet is connected to the first exhaust gas inlet, and the first heat exchanger is used to heat the primary steam condensate into secondary steam condensate, and the temperature of the secondary steam condensate is lower than the temperature of the primary steam condensate;

[0011] The first heat exchanger is connected in series with the second heat exchanger, the second water inlet is connected with the second water outlet, the second air inlet is used to introduce carrier gas, the carrier gas outlet is connected with the carrier gas inlet, the second heat exchanger is used to exchange the secondary steam condensate into tertiary steam condensate, and exchange the carrier gas into high-temperature carrier gas, and the temperature of the tertiary steam condensate is lower than the temperature of the secondary steam condensate.

[0012] Optionally, in the above-mentioned sludge drying system, the first heat exchanger is a cyclone dust collector, which includes an internal cavity and an external insulation coil. The internal cavity is connected to the first exhaust gas inlet and is used to carry the exhaust gas. The external insulation coil is connected to the first water inlet and the second water outlet and is used to carry the primary steam condensate.

[0013] Optionally, in the above-mentioned sludge drying system, the cyclone dust collector further includes a second exhaust gas outlet, the cyclone dust collector is used for heat exchange of the exhaust gas, and the second exhaust gas outlet is used for discharging the exhaust gas after heat exchange from the cyclone dust collector.

[0014] Optionally, in the above-mentioned sludge drying system, the temperature of the exhaust gas is 100°C, the temperature of the first-stage steam condensate is greater than 115°C, the temperature of the second-stage steam condensate is 100-105°C, and the temperature of the third-stage steam condensate is 90-95°C.

[0015] Optionally, in the above-mentioned sludge drying system, the second heat exchanger includes a shell and a tube body, the tube body is sleeved inside the shell, the inside of the tube body forms a first channel for allowing one of the carrier gas and the secondary steam condensate to flow, and a second channel for allowing the other of the carrier gas and the secondary steam condensate to flow is formed between the outer wall of the tube body and the inner wall of the shell.

[0016] Optionally, in the above-mentioned sludge drying system, the sludge drying system also includes a water pump and a condensate recovery device, the second heat exchanger also includes a third water outlet, the water pump is connected to the third water outlet, and is used to transport the third-stage steam condensate to the condensate recovery device.

[0017] Optionally, in the above-mentioned sludge drying system, the sludge drying system further comprises a temperature detector, which is arranged close to the carrier gas outlet and is used to detect the temperature of the high-temperature carrier gas.

[0018] Optionally, in the above-mentioned sludge drying system, the sludge drying system further comprises a water temperature sensor, which is arranged close to the third water outlet and is used to monitor the temperature of the third-stage steam condensate.

[0019] Optionally, in the above-mentioned sludge drying system, the number of the steam trap groups is two or more.

[0020] Optionally, in the above-mentioned sludge drying system, the sludge drying system further includes a tail gas treatment device, which is connected to the second exhaust gas outlet and is used to treat the exhaust gas.

[0021] The sludge drying system provided by the utility model has steam passing through the interior of the sludge dryer when it is in use, and the steam-water mixture generated by the sludge dryer drying sludge enters the steam trap group through the inlet, and separates the first-level steam condensate, the first-level steam condensate and the exhaust gas enter the first heat exchanger, the first-level steam condensate is cooled to become the second-level steam condensate, the second-level steam condensate enters the second heat exchanger through the second water outlet, and exchanges heat with the carrier gas, the second-level steam condensate is cooled to become the third-level steam condensate, the carrier gas is heated to become the high-temperature carrier gas, and the high-temperature carrier gas enters the sludge dryer through the carrier gas outlet and the carrier gas inlet, so that the temperature of the carrier gas entering the sludge dryer can be increased, the temperature difference between the carrier gas entering the sludge dryer and the exhaust gas can be reduced, the steam consumption of the sludge dryer can be reduced, and the energy utilization rate in the sludge drying process can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the sludge drying system disclosed in the embodiment of the utility model;

[0024] in:

[0025] Sludge dryer 100, steam inlet 101, first exhaust gas outlet 102, steam trap group 200, first heat exchanger 300, second water outlet 301, first exhaust gas inlet 302, second exhaust gas outlet 303, second heat exchanger 400, carrier gas outlet 401, third water outlet 402, carrier gas inlet 403, water pump 500, condensate recovery device 600. DETAILED DESCRIPTION

[0026] 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 of the utility model, all other embodiments obtained by ordinary technicians in this field without making novel work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "top surface", "bottom surface" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] Sludge drying: The process of using heat to make sludge lose part or most of its water content through special processes and equipment.

[0029] Sludge dryer: A pressure vessel that uses steam for indirect heat exchange with sludge, with steam on one side and sludge on the other side.

[0030] like Figure 1 As shown, the sludge drying system disclosed in the utility model includes a sludge dryer 100, a steam trap group 200, a first heat exchanger 300 and a second heat exchanger 400, wherein the sludge dryer 100 is provided with a discharge port, a carrier gas inlet and a first exhaust gas outlet 102, the steam trap group 200 is provided with an inlet and a first water outlet, the first heat exchanger 300 is provided with a first water inlet, a first exhaust gas inlet 302 and a second water outlet 301, the second heat exchanger 400 is provided with a second water inlet, a second air inlet and a carrier gas outlet 401, the discharge port of the sludge dryer 100 is connected to the inlet of the steam trap group 200, and the steam trap group 200 is used to separate a first gas-water mixture discharged from the discharge port. Steam condensate, the first water outlet is connected to the first water inlet, the first exhaust gas outlet 102 is connected to the first exhaust gas inlet 302, the first heat exchanger 300 is used to exchange the first-level steam condensate into second-level steam condensate, the temperature of the second-level steam condensate is lower than the temperature of the first-level steam condensate, the first heat exchanger 300 is connected in series with the second heat exchanger 400, the second water inlet is connected to the second water outlet 301, the second air inlet is used to introduce carrier gas, the carrier gas outlet 401 is connected to the carrier gas inlet, the second heat exchanger 400 is used to exchange the second-level steam condensate into tertiary steam condensate, and exchange the carrier gas into high-temperature carrier gas, and the temperature of the tertiary steam condensate is lower than the temperature of the secondary steam condensate.

[0031] Specifically, the sludge dryer 100 also includes a steam inlet 101. The steam required for drying the sludge enters the sludge dryer 100 from the steam inlet 101. The waste gas evaporated during the sludge drying process requires a part of the external ambient air to carry the waste gas out. This part of the ambient air entering the sludge dryer 100 is the carrier gas. In the prior art, the temperature of the carrier gas introduced into the sludge dryer 100 is 20°C, and the carrier gas will consume steam inside the sludge dryer 100 to increase its own temperature. Therefore, by increasing the temperature of the carrier gas before the carrier gas enters the sludge dryer 100, the steam consumption inside the sludge dryer 100 can be reduced, thereby improving the energy utilization rate during the sludge drying process.

[0032] Specifically, the second heat exchanger 400 can be a liquid-gas heat exchanger. The working principle of the liquid-gas heat exchanger is that water is introduced into one side as a heat source, and air is introduced into the other side as a cold source to perform indirect heat exchange, so that the water is cooled and the air is heated, which can meet the application conditions of the second heat exchanger 400. The second heat exchanger 400 can also be other equipment as long as it can realize the heat exchange between secondary steam condensate and carrier gas.

[0033] The sludge drying system provided by the utility model has steam passing through the interior of the sludge dryer 100 when in use, and the steam-water mixture generated by the sludge dryer 100 drying the sludge enters the steam trap group 200 through the inlet, and separates the first-level steam condensate, the first-level steam condensate and the exhaust gas enter the first heat exchanger 300, the first-level steam condensate is cooled to become the second-level steam condensate, the second-level steam condensate enters the second heat exchanger 400 through the second water outlet 301, and exchanges heat with the carrier gas, the second-level steam condensate is cooled to become the third-level steam condensate, the carrier gas is heated to become the high-temperature carrier gas, and the high-temperature carrier gas enters the sludge dryer 100 through the carrier gas outlet 401 and the carrier gas inlet, so that the temperature of the carrier gas entering the sludge dryer 100 can be increased, the temperature difference between the carrier gas entering the sludge dryer 100 and the exhaust gas is reduced, and the steam consumption of the sludge dryer 100 is reduced, thereby improving the energy utilization rate in the sludge drying process.

[0034] It should be noted that the second heat exchanger 400 is provided with a carrier gas inlet 403 , and the low-temperature carrier gas enters the second heat exchanger 400 through the carrier gas inlet 403 .

[0035] In order to optimize the above technical solution, the first heat exchanger 300 is a cyclone dust collector, which includes an internal cavity and an external insulation coil, wherein the internal cavity is connected to the first exhaust gas inlet 302 for carrying the exhaust gas, and the external insulation coil is connected to the first water inlet and the second water outlet 301 for carrying the primary steam condensate. Specifically, the exhaust gas and the primary steam condensate exchange heat indirectly inside the cyclone dust collector. When in use, the steam trap assembly 200 separates the primary steam condensate from the steam-water mixture discharged from the discharge port, and the primary steam condensate enters the external insulation coil through the first water outlet and the first water inlet, and the exhaust gas enters the internal cavity through the first exhaust gas outlet 102 and the first exhaust gas inlet 302. The primary steam condensate exchanges heat with the exhaust gas indirectly, and the primary steam condensate is cooled to the secondary steam condensate, which keeps the exhaust gas warm, thus achieving a primary cooling of the steam condensate. The temperature of the secondary steam condensate is 100-105°C, which can be used to heat the carrier gas. The external insulation coil is a spiral pipe evenly distributed on the outside of the cyclone dust collector, with insulation materials and outer protective plates attached to the outside, and steam condensate passes through the inside, which can keep the exhaust gas warm and cool the steam condensate once. It should be noted that the steam condensate in the prior art needs to be discharged. Since the temperature of the steam condensate is too high to be discharged directly, and cavitation may occur during transportation by the water pump 500, there is no reasonable drainage solution. The utility model can cool the steam condensate once by arranging an external insulation coil, so that it can be discharged by the subsequent application of the water pump 500 without causing damage to the water pump 500, thereby improving the energy utilization rate in the sludge drying process.

[0036] In order to optimize the above technical solution, the cyclone dust collector also includes a second exhaust gas outlet, the cyclone dust collector is used to heat the exhaust gas, and the second exhaust gas outlet is used to discharge the exhaust gas after heat exchange from the cyclone dust collector. When in use, the cyclone dust collector heats the exhaust gas into a gas that is convenient for tail gas treatment, and discharges it through the second exhaust gas outlet. Furthermore, the cyclone dust collector can be used for preliminary purification of the exhaust gas, that is, the heat preservation of the exhaust gas, the cooling of the primary steam condensate and the preliminary purification of the exhaust gas are simultaneously achieved inside the cyclone dust collector, thereby improving the environmental protection effect of the sludge drying system.

[0037] In order to optimize the above technical solution, the temperature of the waste gas is 100°C, the temperature of the first-level steam condensate is greater than 115°C, the temperature of the second-level steam condensate is 100~105°C, and the temperature of the third-level steam condensate is 90~95°C. When in use, the first-level steam condensate exchanges heat with the waste gas inside the first heat exchanger 300, and the first-level steam condensate is cooled to the second-level steam condensate, and the temperature of the second-level steam condensate is 100~105°C. It exchanges heat with the carrier gas inside the second heat exchanger 400, where the temperature of the carrier gas is about 20°C, and the second-level steam condensate is cooled to the third-level steam condensate, and the temperature of the third-level steam condensate is about 90~95°C. The carrier gas is heat-exchanged to a high-temperature carrier gas. Such an arrangement can heat the carrier gas entering the sludge dryer 100 without using additional energy, thereby reducing the steam consumption of the sludge dryer 100 and improving the energy utilization rate in the sludge drying process.

[0038] In order to optimize the above technical solution, the second heat exchanger 400 includes a shell and a tube body, the tube body is sleeved inside the shell, a first channel is formed inside the tube body for circulating one of the carrier gas and the secondary steam condensate, and a second channel is formed between the outer wall of the tube body and the inner wall of the shell for circulating the other of the carrier gas and the secondary steam condensate. Specifically, the utility model preferably performs the heat exchange process of the secondary steam condensate in the first channel, that is, the secondary steam condensate circulates in the first channel, the carrier gas circulates in the second channel, and the carrier gas outlet 401 is arranged at the top of the second heat exchanger 400. When in use, the secondary steam condensate enters the first channel from the second water inlet, the carrier gas enters the second channel from the second air inlet, the secondary steam condensate and the carrier gas exchange heat indirectly, forming the tertiary steam condensate and the high-temperature carrier gas, and the high-temperature carrier gas flows out from the carrier gas outlet 401. The second heat exchanger 400 serves as a carrier gas heating device, which increases the temperature of the carrier gas before it enters the sludge dryer 100, thereby reducing the temperature difference between the carrier gas and the exhaust gas inside the sludge dryer 100, reducing the steam consumption of the sludge dryer 100, and thus improving the energy utilization rate during the sludge drying process.

[0039] In order to optimize the above technical solution, the sludge drying system also includes a water pump 500 and a condensate recovery device 600, and the second heat exchanger 400 also includes a third water outlet 402, and the water pump 500 is connected to the third water outlet 402, and is used to transport the third-level steam condensate to the condensate recovery device 600. Specifically, when the temperature of the liquid transported by the water pump 500 is too high, the water pump 500 may experience cavitation, so when the first-level steam condensate is not heat exchanged, it is necessary to use a hydrophobic heat exchanger to cool the first-level steam condensate, and then discharge it through the water pump 500, while the heat of the first-level steam condensate cannot be used. When in use, the third-level steam condensate enters the water pump 500 from the third water outlet 402, and the water pump 500 transports it to the condensate recovery device 600 for recovery. After two heat exchanges, the first-stage steam condensate is cooled to the third-stage steam condensate, which can be directly transported by the water pump 500 without the need to add a drain heat exchanger. At the same time, part of the heat of the first-stage steam condensate is recycled to heat the carrier gas, and the third-stage steam condensate is recycled, further improving the energy utilization rate in the sludge drying process.

[0040] In order to optimize the above technical solution, the sludge drying system also includes a temperature detector, which is arranged near the carrier gas outlet 401 and is used to detect the temperature of the high-temperature carrier gas. When in use, the temperature detector detects the temperature of the high-temperature carrier gas, and the working conditions of the first heat exchanger 300 and the second heat exchanger 400 can be judged by the temperature of the carrier gas. For example, when the temperature of the carrier gas is too low, it can be judged that the heat exchange effect of the first heat exchanger 300 or the second heat exchanger 400 is not ideal, and the operator can check the equipment condition of the first heat exchanger 300 or the second heat exchanger 400. Further, the operator can judge the amount of steam that needs to be introduced into the sludge dryer 100 according to the temperature of the high-temperature carrier gas. Because the increase in the temperature of the carrier gas will reduce the consumption of steam, when the temperature of the high-temperature carrier gas is high, the operator can appropriately reduce the amount of steam introduced. Such an arrangement can improve the stability of the equipment operation of the sludge drying system, and further improve the energy utilization rate in the sludge drying process.

[0041] In order to optimize the above technical solution, the sludge drying system also includes a water temperature sensor, which is arranged near the third water outlet 402 and is used to monitor the temperature of the third-stage steam condensate. When in use, the water temperature sensor monitors the temperature of the third-stage steam condensate, and the operator can assist in judging the working conditions of the first heat exchanger 300 and the second heat exchanger 400 according to the temperature of the third-stage steam condensate. For example, when the temperature of the third-stage steam condensate is too high, it can be judged that the heat exchange effect of the first heat exchanger 300 or the second heat exchanger 400 is not ideal, and the operator can check the equipment condition of the first heat exchanger 300 or the second heat exchanger 400. Further, when the temperature of the third-stage steam condensate is too high, the operator can shut down the sludge drying system in time to avoid cavitation of the water pump 500 and protect the water pump 500. Such an arrangement can improve the stability of the equipment operation of the sludge drying system and extend the service life of the water pump 500.

[0042] In order to optimize the above technical solution, the number of steam trap groups 200 is two or more. When in use, the discharge port of the sludge dryer 100 is connected to the inlet of two or more steam trap groups 200, the primary steam condensate produced by the two or more steam trap groups 200 flows out from the first water outlet and is collected in the same pipeline, the outlet of this pipeline is connected to the first water inlet of the first heat exchanger 300, and the exhaust gas produced by the two or more steam trap groups 200 flows out from the first exhaust gas outlet 102 and is also collected in the same pipeline, the outlet of this pipeline is connected to the first exhaust gas inlet 302. Such an arrangement can simplify the pipeline of the sludge drying system, so as to facilitate the assembly and installation of the sludge drying system.

[0043] In order to optimize the above technical solution, the sludge drying system further includes an exhaust gas treatment device 700, which is connected to the second exhaust gas outlet 303 and is used to treat the exhaust gas. When in use, the exhaust gas after insulation and preliminary purification enters the exhaust gas treatment device 700 for treatment, and is discharged after reaching the emission standard. Such an arrangement can reduce the pollution of the sludge drying system to the environment and meet the environmental protection requirements.

[0044] The utility model realizes two-stage heat exchange of steam condensate by arranging a cyclone dust collector and a liquid-gas heat exchanger at the carrier gas inlet, and cools the steam condensate so that the steam condensate can be transported by a water pump 500. The carrier gas is heated to above 90°C by the cyclone dust collector and the liquid-gas heat exchanger and enters the sludge dryer 100, thereby reducing the consumption of steam and improving the sludge drying efficiency of the sludge drying system. At the same time, the steam condensate is cooled, which is conducive to the transportation of the steam condensate.

[0045] It should be noted that the sludge drying system provided by the utility model can be used in the technical field of sludge drying equipment or other fields. Other fields are any fields other than the technical field of sludge drying equipment. The above is only an example and does not limit the application field of the sludge drying system provided by the utility model.

[0046] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A sludge drying system, characterized in that: It includes a sludge dryer, a steam trap group, a first heat exchanger and a second heat exchanger, wherein: The sludge dryer is provided with a discharge port, a carrier gas inlet and a first exhaust gas outlet, the steam trap group is provided with an inlet and a first water outlet, the first heat exchanger is provided with a first water inlet, a first exhaust gas inlet and a second water outlet, and the second heat exchanger is provided with a second water inlet, a second air inlet and a carrier gas outlet; The discharge port of the sludge dryer is connected to the inlet of the steam trap group, and the steam trap group is used to separate the primary steam condensate from the steam-water mixture discharged from the discharge port; The first water outlet is connected to the first water inlet, the first exhaust gas outlet is connected to the first exhaust gas inlet, and the first heat exchanger is used to heat the primary steam condensate into secondary steam condensate, and the temperature of the secondary steam condensate is lower than the temperature of the primary steam condensate; The first heat exchanger is connected in series with the second heat exchanger, the second water inlet is connected with the second water outlet, the second air inlet is used to introduce carrier gas, the carrier gas outlet is connected with the carrier gas inlet, the second heat exchanger is used to exchange the secondary steam condensate into tertiary steam condensate, and exchange the carrier gas into high-temperature carrier gas, and the temperature of the tertiary steam condensate is lower than the temperature of the secondary steam condensate.

2. The sludge drying system according to claim 1, characterized in that: The first heat exchanger is a cyclone dust collector, which includes an internal cavity and an external insulation coil. The internal cavity is connected to the first exhaust gas inlet and is used to carry the exhaust gas. The external insulation coil is connected to the first water inlet and the second water outlet and is used to carry the primary steam condensate.

3. The sludge drying system according to claim 2, characterized in that: The cyclone dust collector further includes a second exhaust gas outlet. The cyclone dust collector is used for heat exchange of the exhaust gas. The second exhaust gas outlet is used for discharging the exhaust gas after heat exchange from the cyclone dust collector.

4. The sludge drying system according to claim 1, characterized in that: The temperature of the exhaust gas is 100°C, the temperature of the primary steam condensate is greater than 115°C, the temperature of the secondary steam condensate is 100-105°C, and the temperature of the tertiary steam condensate is 90-95°C.

5. The sludge drying system according to claim 1, characterized in that: The second heat exchanger includes a shell and a tube body, the tube body is sleeved inside the shell, a first channel for allowing one of the carrier gas and the secondary steam condensate to flow is formed inside the tube body, and a second channel for allowing the other of the carrier gas and the secondary steam condensate to flow is formed between the outer wall of the tube body and the inner wall of the shell.

6. The sludge drying system according to claim 1, characterized in that: The sludge drying system also includes a water pump and a condensate recovery device. The second heat exchanger also includes a third water outlet. The water pump is connected to the third water outlet and is used to transport the third-stage steam condensate to the condensate recovery device.

7. The sludge drying system according to claim 1, characterized in that: The sludge drying system also includes a temperature detector, which is arranged close to the carrier gas outlet and is used to detect the temperature of the high-temperature carrier gas.

8. The sludge drying system according to claim 6, characterized in that: The sludge drying system also includes a water temperature sensor, which is arranged close to the third water outlet and is used to monitor the temperature of the third-stage steam condensate.

9. The sludge drying system according to claim 1, characterized in that: The number of the steam trap groups is two or more.

10. The sludge drying system according to claim 3, characterized in that: The sludge drying system further comprises a tail gas treatment device, which is connected to the second waste gas outlet and is used for treating the waste gas.

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