Sludge reduction system

Abstract

The utility model discloses a sludge reduction system which comprises a heat pump compressor, a heat pump evaporation and condensation heat exchanger, a heat pump heat exchanger, a hot water heat exchanger, a thin-layer slurry type evaporation drying machine, a speed reduction driving motor, a hollow slurry type heat exchanger and a steam generator, sludge is sequentially fed into the heat pump heat exchanger, the hot water heat exchanger and the thin-layer slurry type evaporation drying machine from the sludge feeding port through a pipeline, and the sludge is discharged through the sludge discharging screw pump. Wherein a sludge feeding screw pump is arranged on a pipeline between the sludge feeding port and the heat pump heat exchanger, and a vacuum check valve is arranged on a pipeline between the sludge discharging screw pump and the sludge discharging port; a refrigerant medium is compressed in the heat pump compressor, an outlet of the heat pump compressor feeds the compressed high-temperature medium into the heat pump heat exchanger through a pipeline, and an outlet of the heat pump heat exchanger communicates with the heat pump evaporation and condensation heat exchanger through a pipeline. The sludge can be subjected to deep reduction treatment until the water content is below 20%, and the total amount of the sludge is reduced. The operation cost of the treatment process is controllable.

Description

Technical Field

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

[0002] Sludge is an unavoidable byproduct of sewage treatment, often containing pathogenic microorganisms, parasite eggs, harmful heavy metals, and numerous recalcitrant substances. If not thoroughly disposed of, it can easily cause secondary environmental pollution. The COD (chemical oxygen demand) transferred from sewage to sludge accounts for approximately 30% to 50%, while nitrogen accounts for approximately 20% to 30%, and phosphorus accounts for approximately 90%. If these substances are not effectively treated, energy conservation and emission reduction goals will be significantly compromised. On the other hand, sludge also contains nutrients such as nitrogen and phosphorus. With proper treatment, it can be used as fertilizer, improve soil quality, and promote plant growth. The biogas generated by treatment can also be used as an energy source, addressing certain energy needs. Properly treating sludge to stabilize, render it harmless, reduce its volume, and recycle it into a resource has become a pressing issue in environmental pollution control.

[0003] Contrary to the trend of increasing sludge production year after year, the effective sludge treatment rate remains low. Currently, many sewage treatment companies resort to direct dumping or simple landfill disposal of sludge, which not only threatens the soil environment and public health but also wastes resources. Currently, sludge treatment and disposal capacity is insufficient and methods are outdated. Large amounts of sludge are not handled in a standardized manner, directly causing "secondary pollution" to water bodies, soil, and the atmosphere, posing a serious threat to the ecological environment.

[0004] Currently, municipal sewage treatment plants generate a large amount of excess sludge daily during operation. After internal treatment, the sludge is typically transported to a designated location for disposal once its moisture content drops below 80%. Currently, the industry generally adopts landfill disposal, which occupies a significant amount of land resources. Summary of the Invention

[0005] The purpose of this utility model is to provide a sludge reduction system to solve the technical problems of current sludge treatment, such as high cost, low efficiency, complex process, easy secondary pollution of the environment by the treated materials, and occupation of land resources.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: a sludge reduction system, which includes a heat pump compressor, a heat pump evaporation-condensation heat exchanger, a heat pump heat exchanger, a hot water heat exchanger, a thin-layer slurry evaporation dryer, a reduction drive motor, a hollow slurry heat exchanger and a steam generator. The sludge is sequentially fed into the heat pump heat exchanger, the hot water heat exchanger and the thin-layer slurry evaporation dryer from the sludge feed port through a pipeline, and the sludge is discharged by a sludge discharge screw pump. A sludge feed screw pump is provided on the pipeline between the sludge feed port and the heat pump heat exchanger, and a vacuum check valve is provided on the pipeline between the sludge discharge screw pump and the sludge discharge port.

[0007] The refrigerant medium is compressed in the heat pump compressor, and the outlet of the heat pump compressor sends the compressed high-temperature medium into the heat pump heat exchanger through a pipeline. The outlet of the heat pump heat exchanger is connected to the heat pump evaporation-condensing heat exchanger through a pipeline.

[0008] Furthermore, a heat pump evaporation expansion and pressure reducing valve is provided between the heat pump heat exchanger and the heat pump evaporation condensation heat exchanger.

[0009] Furthermore, the thin-layer slurry evaporation dryer includes a reduction drive motor, a hollow slurry heat exchanger and a dryer body.

[0010] Furthermore, the outer layer of the dryer body is provided with a steam heating jacket.

[0011] Furthermore, the sludge reduction system also includes a steam mechanical recompression system; the steam mechanical recompression system includes a thin layer slurry evaporation dryer, a steam compressor and a steam reflux valve;

[0012] The sludge passes through the thin layer slurry evaporation dryer, hollow slurry heat exchanger and steam compressor in sequence;

[0013] The pressurized and heated steam is sent through pipelines to the steam heating jacket of the dryer body and the hollow slurry heat exchanger to complete heat exchange and perform vacuum low-temperature evaporation. The condensed water enters the hot water heat exchanger and the heat pump evaporation-condensation heat exchanger in sequence through pipelines and is then sent to the tail water outlet.

[0014] Furthermore, a steam reflux valve is provided on the pipeline between the hollow paddle heat exchanger and the steam compressor.

[0015] Furthermore, a vacuum pump is provided on one side of the pipeline where the thin-layer slurry evaporation dryer is located, and a steam generator is provided on the other side.

[0016] Furthermore, the pressure of vacuum low-temperature evaporation is -10~-30kPa.

[0017] Furthermore, the temperature inside the thin layer slurry evaporation dryer is 50°C-80°C.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The technology provided by this utility model is a combination of heat pump technology, thin layer slurry heat exchange technology, and MVR (steam mechanical recompression) technology.

[0020] 2. The utility model can deeply reduce the sludge with a moisture content of 80% to a moisture content of less than 20%, thereby reducing the total amount of sludge.

[0021] 3. The processing process of the utility model has controllable operating costs, high efficiency and high automation level.

[0022] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The main purpose and other advantages of the present invention can be achieved and obtained through the solutions specifically pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Figure 1 It is a process flow chart of the utility model;

[0025] Figure markings: 1-sludge feed screw pump, 2-heat pump compressor, 3-heat pump evaporation condensation heat exchanger, 4-heat pump heat exchanger, 5-heat pump evaporation expansion pressure reducing valve, 6-hot water heat exchanger, 7-thin layer slurry evaporation dryer, 8-reduction drive motor, 9-hollow slurry heat exchanger, 10-steam compressor, 11-steam reflux valve, 12-sludge discharge screw pump, 13-vacuum check valve, 14-steam generator, 15-vacuum pump. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention are described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solutions of the present invention, and cannot be interpreted as limiting the technical solutions of the present invention.

[0027] See also Figure 1 The utility model provides a sludge reduction system. After sludge with a moisture content of 80% is pressurized by a sludge feeding screw pump 1, it enters a heat pump heat exchanger 4 for preheating and then enters a hot water heat exchanger 6 for further heating and then enters a thin layer slurry evaporation dryer 7 to be heated to 50-80°C and subjected to vacuum at -10~-30kPa and low-temperature evaporation. After treatment, the moisture content of the sludge is reduced to 10-20%, and the sludge is discharged through a sludge discharging screw pump 12 and a vacuum check valve 13.

[0028] The heat pump system consists of a heat pump compressor 2, a heat pump evaporation-condensing heat exchanger 3, a heat pump heat exchanger 4, and a heat pump evaporation-reducing valve 5. The heat pump compressor 2 compresses the refrigerant medium. The compressed high-temperature medium enters the heat pump heat exchanger 4 to heat the sludge, and then enters the heat pump evaporation-condensing heat exchanger 3 after passing through the heat pump evaporation-expansion-reducing valve 5 to condense and exchange heat with hot water. The above process continuously circulates heat exchange between sludge and hot water.

[0029] The thin-layer slurry evaporation dryer 7 is composed of a reduction drive motor 8, a hollow slurry heat exchanger 9, and a dryer body, wherein the outer layer of the dryer body is provided with a steam heating jacket.

[0030] The MVR (Steam Mechanical Recompression) system consists of a thin-layer slurry evaporation dryer 7, a steam compressor 10, and a steam return valve 11. The heated sludge material is evaporated in the thin-layer slurry evaporation dryer 7 at a low temperature of -10 to -30 kPa after heat exchange in the dryer jacket and hollow slurry heat exchanger 9. The steam then enters the steam compressor 10 for pressurization and temperature increase. The steam return valve 11 assists in load regulation of the steam compressor 10. After pressurization and temperature increase, the steam enters the dryer's steam heating jacket and hollow slurry heat exchanger 9 for heat exchange. The condensed water enters the hot water heat exchanger 6 and the heat pump evaporation-condensation heat exchanger 3 for further heat exchange before being discharged for disposal.

[0031] The auxiliary system steam generator 14 provides heating steam for starting the thin layer slurry evaporation dryer 7 at the initial stage of operation and provides heating steam assistance when the MVR system is insufficient. The vacuum pump 15 provides vacuum assistance during the initial stage of operation of the thin layer slurry evaporation dryer 7.

[0032] This utility model combines heat pump technology, thin-layer slurry heat exchange technology, and MVR steam mechanical recompression technology. This effectively reduces sludge with a moisture content of 80% to below 20%, reducing the total sludge volume. The overall treatment process offers controllable operating costs, high efficiency, and a high level of automation.

[0033] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. Sludge reduction system, characterized by: The system includes a heat pump compressor, a heat pump evaporation-condensation heat exchanger, a heat pump heat exchanger, a hot water heat exchanger, a thin-layer slurry evaporation-drying machine, a reduction drive motor, a hollow slurry heat exchanger, and a steam generator. Sludge is sequentially fed into the heat pump heat exchanger, the hot water heat exchanger, and the thin-layer slurry evaporation-drying machine through a pipeline from a sludge feed port, and the sludge is discharged by a sludge discharge screw pump. A sludge feed screw pump is provided on the pipeline between the sludge feed port and the heat pump heat exchanger, and a vacuum check valve is provided on the pipeline between the sludge discharge screw pump and the sludge discharge port. The refrigerant medium is compressed in the heat pump compressor, and the outlet of the heat pump compressor sends the compressed high-temperature medium into the heat pump heat exchanger through a pipeline. The outlet of the heat pump heat exchanger is connected to the heat pump evaporation-condensing heat exchanger through a pipeline.

2. The sludge reduction system according to claim 1, characterized in that: in, A heat pump evaporation expansion pressure reducing valve is also provided between the heat pump heat exchanger and the heat pump evaporation condensation heat exchanger.

3. The sludge reduction system according to claim 1, characterized in that: The thin layer slurry evaporation dryer includes a reduction drive motor, a hollow slurry heat exchanger and a dryer body.

4. The sludge reduction system according to claim 3, characterized in that: The outer layer of the dryer body is equipped with a steam heating jacket.

5. The sludge reduction system according to claim 3, characterized in that: The sludge reduction system also includes a steam mechanical recompression system; the steam mechanical recompression system includes a thin layer slurry evaporation dryer, a steam compressor and a steam reflux valve; The sludge passes through the thin layer slurry evaporation dryer, hollow slurry heat exchanger and steam compressor in sequence; The pressurized and heated steam is sent through pipelines to the steam heating jacket of the dryer body and the hollow slurry heat exchanger to complete heat exchange and perform vacuum low-temperature evaporation. The condensed water enters the hot water heat exchanger and the heat pump evaporation-condensation heat exchanger in sequence through pipelines and is then sent to the tail water outlet.

6. The sludge reduction system according to claim 5, characterized in that: A steam reflux valve is also provided on the pipeline between the hollow slurry heat exchanger and the steam compressor.

7. The sludge reduction system according to claim 1, characterized in that: A vacuum pump is provided on one side of the pipeline where the thin-layer slurry evaporation dryer is located, and a steam generator is provided on the other side.

8. The sludge reduction system according to claim 5, characterized in that: The pressure of vacuum low-temperature evaporation is -10~-30kPa.

9. The sludge reduction system according to claim 1, characterized in that: The temperature inside the thin layer slurry evaporation dryer is 50℃-80℃.

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