Heat energy recovery system for sludge drying

Abstract

The utility model discloses a heat energy recovery system for sludge drying, which belongs to the field of sludge treatment and comprises an incinerator, the incinerator is connected with a flue, the flue is provided with a waste heat recovery pipeline, and the waste heat recovery pipeline is communicated with a hot air drying furnace; the heat energy recovery system further comprises a first heat exchanger arranged outside the incinerator, a second heat exchanger is arranged in the hot air drying furnace, and the first heat exchanger and the second heat exchanger are connected through a heat exchange system. The waste heat recovery pipeline is arranged on the flue of the incinerator and communicated with the hot air drying furnace, and the first heat exchanger and the second heat exchanger are arranged outside the incinerator and in the hot air drying furnace respectively, so that waste heat generated in the incineration process can be effectively recycled. And waste heat of the incinerator body of the incinerator is effectively utilized to preheat the hot air drying furnace in advance, so that the hot air drying efficiency is improved, and the energy consumption in the sludge drying process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sludge treatment, and concretely relates to a heat energy recovery system for sludge drying. BACKGROUND

[0002] In the sewage treatment process, a large amount of sludge will be produced, and the sludge contains a high proportion of water, which needs to be dried to reduce the volume, reduce the transportation cost and create conditions for subsequent resource utilization or disposal.

[0003] The traditional sludge drying method usually adopts a direct heating mode, and uses an electric heater, a gas boiler or the like to provide a heat source, for example, a Chinese patent with publication number CN114754361A discloses a sludge drying and incineration energy-saving control device and method, which comprises a wet sludge storage bin, a wet sludge conveying pump, a pipeline type sludge moisture content microwave transmitter, a sludge dryer, a dry sludge buffer bin, a silo type sludge moisture content microwave transmitter, a dry sludge conveying pump and a sludge incinerator. The pipeline type sludge moisture content microwave transmitter is arranged between the wet sludge conveying pump and the sludge dryer. The silo type sludge moisture content microwave transmitter is installed on the dry sludge buffer bin. The sludge dryer is connected with a dryer heat source. The sludge incinerator is connected with a fuel source through a combustion-supporting fuel pipeline. However, these traditional treatment modes still have problems of high energy consumption and high operation cost, and the heat is not well utilized.

[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a heat energy recovery system for sludge drying. The utility model is realized by the following technical scheme:

[0006] The heat energy recovery system for sludge drying comprises an incinerator, the incinerator is connected with a flue, a waste heat recovery pipeline is arranged on the flue, and the waste heat recovery pipeline leads into a hot air drying furnace.

[0007] The heat energy recovery system further comprises a first heat exchanger arranged outside the incinerator, a second heat exchanger arranged in the hot air drying furnace, and the first heat exchanger and the second heat exchanger are connected through a heat exchange system.

[0008] Preferably, the waste heat recovery pipeline leads into the lower part of the hot air drying furnace.

[0009] Preferably, a blower is installed on the waste heat recovery pipeline.

[0010] Preferably, the first heat exchanger is arranged around the outer wall of the incinerator.

[0011] Preferably, the second heat exchanger is arranged in a vertical direction in the hot air drying furnace.

[0012] The heat exchange pipe of the second heat exchanger is arranged in a ring shape or an S shape in the hot air drying furnace.

[0013] Preferably, the heat exchange system comprises a power pump for transporting the heat exchange medium to and from the first heat exchanger and the second heat exchanger.

[0014] Preferably, the heat exchange system is connected with a liquid storage tank, and a reversing assembly is arranged in the heat exchange system for changing the flow direction of the heat exchange medium, and the first heat exchanger, the second heat exchanger, the liquid storage tank and the power pump are connected with the reversing assembly.

[0015] Preferably, the first temperature sensor and the second temperature sensor are arranged in the interior and the exterior of the second heat exchanger respectively.

[0016] Compared with the prior art, the heat exchange system has the following beneficial effects:

[0017] 1. By arranging the waste heat recovery pipe on the flue of the incinerator, connecting the pipe into the hot air drying furnace, and arranging the first heat exchanger and the second heat exchanger outside the incinerator and in the hot air drying furnace respectively, the waste heat generated in the incineration process can be effectively recycled and utilized, and the waste heat of the furnace body of the incinerator is effectively utilized to preheat the hot air drying furnace, thereby improving the hot air drying efficiency and reducing the energy consumption in the sludge drying process.

[0018] 2. By arranging the first heat exchanger around the outer wall of the incinerator, the heat generated from the surface of the incinerator can be maximally contacted, and more efficient heat collection can be realized, and meanwhile, the arrangement simplifies the system structure and facilitates maintenance and repair.

[0019] 3. By arranging the second heat exchanger in a vertical direction and adopting the ring-shaped or S-shaped heat exchange pipe, the heat exchange area is increased, the heat exchange effect is strengthened, the speed and quality of sludge drying are improved, the compact design saves space, sludge can be easily poured in and poured out, and the overall performance of the system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 is a schematic diagram of the back three-dimensional structure of the utility model;

[0022] Figure 3 is a schematic diagram of the arrangement of the second heat exchanger in the utility model;

[0023] Figure 4 is a schematic diagram of the connection of the heat exchange system in the utility model.

[0024] In the diagram: 1. Incinerator; 2. Flue; 3. Waste heat recovery pipeline; 4. Hot air dryer; 5. First heat exchanger; 6. Second heat exchanger; 7. Blower; 8. Heat exchange system; 81. Liquid storage tank; 82. Reversing assembly; 821. On / off valve; 822. Reversing valve; 83. Power pump Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1 – Figure 4 As shown, this embodiment provides a heat recovery system for sludge drying, including an incinerator 1, the incinerator 1 being connected to a flue 2, the flue 2 being provided with a waste heat recovery pipe 3, and the waste heat recovery pipe 3 being connected to a hot air dryer 4.

[0027] The heat recovery system also includes a first heat exchanger 5 installed outside the incinerator 1, and a second heat exchanger 6 installed in the hot air dryer 4. The first heat exchanger 5 and the second heat exchanger 6 are connected by a heat exchange system 8.

[0028] By installing a waste heat recovery pipe 3 on the flue 2 of the incinerator 1 and connecting the pipe to the hot air dryer 4, and by installing a first heat exchanger 5 and a second heat exchanger 6 outside the incinerator 1 and inside the hot air dryer 4 respectively, the waste heat generated during the incineration process can be effectively recovered and utilized. Furthermore, the waste heat from the furnace body of the incinerator 1 can be effectively used to preheat the hot air dryer 4, thereby improving the hot air drying efficiency and reducing the energy consumption during the sludge drying process.

[0029] Preferably, the waste heat recovery pipe 3 extends to the bottom of the hot air dryer 4. Extending the waste heat recovery pipe 3 to the bottom of the hot air dryer 4 ensures that the hot airflow flows from bottom to top, forming a natural chimney effect, enhancing heat transfer efficiency, and simultaneously preventing the possibility of moisture condensing and flowing back into the flue 2 inside the hot air dryer 4, thus ensuring stable system operation. Specifically, the preheating recovery pipe can directly guide the flue gas to the bottom of the hot air dryer 4, or an airflow heat exchanger can be installed in the flue 2 (conventional technology in this field, not elaborated further here), utilizing only the heat from the flue gas in the flue 2 to guide natural airflow to heat the sludge in the hot air dryer 4.

[0030] Preferably, the waste heat recovery pipeline 3 is provided with a blower 7. The power part and the blade of the blower 7 are connected through an output shaft, the length of the output shaft is set as long as possible to avoid the motor from being overheated by the flue gas. The installation of the blower 7 on the waste heat recovery pipeline 3 and the connection of the motor and the blade through the long output shaft can improve the air flow and increase the heat exchange speed, prevent the motor from being overheated and damaged due to the influence of high-temperature flue gas, prolong the service life of the equipment, and ensure the safety and reliability of the system.

[0031] Preferably, the first heat exchanger 5 is arranged around the outer wall of the incinerator 1. By arranging the first heat exchanger 5 around the outer wall of the incinerator 1, the heat emitted from the surface of the incinerator 1 can be maximally contacted to realize more efficient heat energy collection. At the same time, this arrangement also simplifies the structure of the system and facilitates maintenance and repair.

[0032] Further, the second heat exchanger 6 is arranged in the vertical direction in the hot air drying furnace 4.

[0033] The heat exchange pipeline of the second heat exchanger 6 is arranged in a ring shape or an S shape in the hot air drying furnace 4.

[0034] By arranging the second heat exchanger 6 in the vertical direction and adopting the ring-shaped or S-shaped heat exchange pipeline, the heat exchange area is increased and the heat exchange effect is strengthened, which is conducive to improving the speed and quality of sludge drying. At the same time, the compact design saves space, facilitates sludge pouring and pouring out, and improves the overall performance of the system.

[0035] The heat exchange system 8 includes a power pump 83 for transporting the heat exchange medium to and from the first heat exchanger 5 and the second heat exchanger 6. Specifically, the heat exchange medium can be water or other liquid with high specific heat capacity.

[0036] The heat exchange system 8 is connected with a liquid storage tank 81, and a reversing assembly 82 is arranged in the heat exchange system 8 for changing the flow direction of the heat exchange medium. The first heat exchanger 5, the second heat exchanger 6, the liquid storage tank 81 and the power pump 83 are all connected with the reversing assembly 82.

[0037] As shown in Figure 4 The heat exchange assembly further includes an on-off valve 821 and a reversing valve 822. When the heat exchange is normally carried out, the on-off valve 821 is closed, and the direction of the reversing valve 822 is that the power pump 83 flows to the second heat exchanger 6, the first heat exchanger 5 in turn, and then flows back to the power pump 83.

[0038] When heat exchange is not needed, the on-off valve 821 is opened, and the direction controlled by the reversing valve 822 is from the liquid storage tank 81, through the power pump 83, the first heat exchanger 5, the second heat exchanger 6, and then back to the liquid storage tank 81. When heat exchange is needed, the flow direction is reversed, so that the heat exchange medium fills the first heat exchanger 5 and the second heat exchanger 6.

[0039] Further preferably, liquid flow sensors are arranged on the two inlet and outlet pipelines of the liquid storage tank 81 to detect whether the heat exchange medium has flowed to the right position. If the heat exchange medium has flowed to the right position, the working states of the on-off valve 821 and the reversing valve 822 can be changed.

[0040] Preferably, the inside and outside of the second heat exchanger 6 are respectively provided with first and second temperature sensors. The temperature change in the heat exchange process can be monitored in real time, which provides accurate data support for optimizing the operation parameters and helps to improve the automation control level and operation safety of the entire system.

[0041] Further, the hot blast stove 4 still has a main hot blast source, and the heat of the flue 2 and the heat of the second heat exchanger 6 are only auxiliary heating or preheating. When it is detected that the temperature detected by the first temperature sensor inside the second heat exchanger 6 is lower than the temperature detected by the second temperature sensor outside, in order to avoid the opposite effect, the provision of the heat of the flue 2 and the second heat exchanger 6 by the hot blast stove 4 can be stopped.

Claims

1. A thermal energy recovery system for sludge drying, comprising an incinerator (1) to which a flue (2) is connected, characterized in that: The flue (2) is provided with a waste heat recovery pipeline (3) which is connected to a hot air drying furnace (4); The heat recovery system further comprises a first heat exchanger (5) arranged outside the incinerator (1), and a second heat exchanger (6) arranged in the hot air drying furnace (4), wherein the first heat exchanger (5) and the second heat exchanger (6) are connected through a heat exchange system (8).

2. A thermal energy recovery system for sludge dewatering according to claim 1, characterized in that: The waste heat recovery pipeline (3) is connected to the lower part of the hot air drying furnace (4).

3. A thermal energy recovery system for sludge dewatering according to claim 2, characterized in that: A blower (7) is arranged on the waste heat recovery pipeline (3).

4. A thermal energy recovery system for sludge dewatering according to claim 1, characterized in that: The first heat exchanger (5) is arranged around the outer wall of the incinerator (1).

5. A thermal energy recovery system for sludge dewatering according to claim 1, characterized in that: The second heat exchanger (6) is arranged in the vertical direction in the hot air drying furnace (4). The heat exchange pipeline of the second heat exchanger (6) is arranged in a ring shape or an S shape in the hot air drying furnace (4).

6. A thermal energy recovery system for sludge dewatering according to any one of claims 1-5, characterized in that: The heat exchange system (8) comprises a power pump (83) for transporting the heat exchange medium to and from the first heat exchanger (5) and the second heat exchanger (6).

7. A thermal energy recovery system for sludge dewatering according to claim 6, characterized in that: The heat exchange system (8) is connected with a liquid storage tank (81), and a reversing assembly (82) is arranged in the heat exchange system (8) for changing the flow direction of the heat exchange medium, wherein the first heat exchanger (5), the second heat exchanger (6), the liquid storage tank (81) and the power pump (83) are all connected with the reversing assembly (82).

8. A thermal energy recovery system for sludge dewatering according to claim 7, characterized in that: The first temperature sensor and the second temperature sensor are arranged in the inside and outside of the second heat exchanger (6), respectively.

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