CN211035648U

CN211035648U - Freezing preprocessing device of normal position mud

Info

Publication number: CN211035648U
Application number: CN201921486276.XU
Authority: CN
Inventors: 张汝壮; 诸毅; 刘菁菁; 宋厚燃; 李影辉; 薛梦雨; 方兴斌
Original assignee: Shanghai Environmental Green Ecological Restoration Technology Co ltd
Current assignee: Shanghai Chengtou Shangjing Ecological Restoration Technology Co.,Ltd.
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-07-17
Anticipated expiration: 2029-09-09

Abstract

The utility model relates to a freezing preprocessing device of normal position mud, including being used for perpendicularly to pending mud place male freezing pipe, the entry, the export that freeze the pipe communicate respectively to refrigerant main, the backward flow main that are used for laying on the soil face, the backward flow main communicates to the refrigerator, the refrigerator loops through water tank, water pump through the pipeline and switches on to the refrigerant main. The utility model has the advantages that the advantages of the construction by the frozen soil method are combined, the sludge landfill is pretreated in situ, the frozen sludge provides a working interface, and the sludge landfill is convenient to excavate; reduce the odor concentration in the excavation process and prevent the occurrence of secondary pollution.

Description

Freezing preprocessing device of normal position mud

Technical Field

The utility model relates to a mud landfill (sludge pit) normal position restoration technical field among the environmental protection specifically is a normal position mud refrigeration pretreatment system.

Background

The sludge treatment industry in China is developed late, and sewage treatment plants built in early days generally have the tendency of 'heavy water and light sludge', pursue the sewage treatment rate, neglect the final treatment of the sludge, and most of the sewage treatment plants do not have perfect and matched sludge treatment measures. The amount of sludge that is not properly disposed of annually has exceeded 3000 million tons as predicted by expert research. Because the sludge contains a large amount of toxic and harmful substances such as heavy metals, persistent organic pollutants, parasitic ova, pathogenic microorganisms and the like, if the sludge cannot be properly treated, the sludge is bound to be a 'timing bomb' which detonates the environmental crisis, and the sludge treatment and the resource utilization become important environmental and social problems in China.

The problem that sludge treatment in a sewage treatment plant is difficult to go out once is effectively solved once by transporting town sludge to a sludge landfill for landfill. However, as the amount of sludge in cities and towns is increased, the demand for sludge landfill sites is increased, and the problem of capacity expansion of the sludge landfill sites, which is solved by occupying less land, is urgently solved due to the limit value of land resources.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the not enough of prior art, solve the long-term closure of sludge landfill and take off the membrane after, when controlling the foul smell diffusion problem, also can solve the wider landfill excavation problem of area.

In order to achieve the aim, the invention provides an in-situ sludge freezing pretreatment device which comprises a freezing pipe vertically inserted into a sludge field to be treated, wherein an inlet and an outlet of the freezing pipe are respectively communicated with a refrigerant main pipe and a backflow main pipe which are paved on a soil surface, the backflow main pipe is communicated with a refrigerator, and the refrigerator is communicated with the refrigerant main pipe through a water tank and a water pump in sequence through pipelines.

The coolant used in the present disclosure may be a coolant that does not hinder the construction work, such as a saline solution of calcium chloride, magnesium chloride, sodium chloride, lithium chloride, or the like. The chiller may be a screw compressor and employ freon or its substitute as a refrigerant. The water tank and the water pump disclosed herein are essentially corresponding devices for adapting the refrigerant.

Preferably, a temperature sensing device for displaying temperature information outwards is installed in the refrigerant main pipe and the backflow main pipe.

The temperature sensing device can be selected from model space power AI-208G, ZR 10.

Preferably, the device also comprises a temperature sensing probe which is arranged in the sludge to be treated and used for showing temperature information outwards.

The temperature sensing probe can be selected from Hydra probe II type, FR-100W type, etc.

Preferably, a temperature monitoring device for displaying temperature information outwards to identify whether the refrigerator is in normal operation is installed in a cooling tower cooling water circulation pipeline in the refrigerator.

The refrigerator can be selected from W-YS L GF300 II screw machine, and the temperature monitoring device can be selected from Yu Yi-208G, ZR 10.

Preferably, the refrigerant main pipe and the backflow main pipe wrap the heat insulation outer layer.

The heat insulation outer layer disclosed by the invention can be made of materials with low heat conductivity coefficient, such as polyurethane, composite silicate and the like, and can also be directly made of materials with good heat insulation effect, such as glass wool tubes and the like, as pipeline materials of the refrigerant main pipe and the backflow main pipe or shells thereof when the heat insulation outer layer is not arranged.

All parts of the in-situ sludge freezing pretreatment device are mutually connected to construct an in-situ sludge freezing integrated system for pretreatment of sludge landfill restoration and excavation. The freezing pretreatment can effectively control the concentration of odor in the membrane of the sludge landfill, and prevent secondary pollution caused by odor diffusion; the sludge after freezing pretreatment has certain structural strength, can provide a working interface for sludge excavation, and is convenient to construct; the structural performance of the frozen sludge can be changed, cell walls of microorganisms in the sludge are crushed through freeze thawing to release most of intracellular water, and subsequent dehydration is more thorough; the whole pretreatment process adopts a physical method for disposal, no chemical agent is needed to be added, the total amount of sludge is not increased, and secondary pollution is not generated.

Because the technology has high requirement on the freezing temperature control of the refrigerant and the sludge, the whole-course monitoring is needed in the freezing process. The temperature sensing device in the refrigerant main pipe mainly controls the temperature of the refrigerant, so that freezing is strictly carried out according to the design temperature, and the generated temperature deviation can be adjusted in time. The temperature sensing probe in the sludge is mainly used for monitoring the freezing effect and ensuring that the sludge can reach the designed freezing temperature and strength. The temperature sensing device, the temperature monitoring device and the temperature sensing probe are combined, so that adjustment can be timely made when the temperature changes, and fine management is achieved. The temperature and the water quantity of the cooling water have direct relations with the normal operation of a refrigerator, the refrigeration efficiency of a compressor and the temperature of a refrigerant, if the temperature and the water quantity of the cooling water are high or the water quantity is insufficient, the discharge temperature and the pressure of the compressor are too high, the operation and the maintenance are difficult, the refrigeration efficiency is low, meanwhile, the temperature of the refrigerant cannot meet the design requirement, the freezing time must be prolonged, the strength of the frozen sludge is low, the construction safety is reduced, and therefore the temperature monitoring device is used for detecting so as to regulate and control at any time.

Because the main pipe is exposed in the external environment, the flowing period of the refrigerant in the pipeline is long, so that heat insulation measures must be made to prevent the refrigerant from absorbing external heat and influencing the refrigeration effect.

The utility model has the advantages that the advantages of the construction by the frozen soil method are combined, the sludge landfill is pretreated in situ, the frozen sludge provides a working interface, and the sludge landfill is convenient to excavate; reduce the odor concentration in the excavation process and prevent the occurrence of secondary pollution.

Drawings

FIG. 1 is a schematic view of an in-situ sludge freezing pretreatment device of the present invention;

wherein:

1-freezing pipe 2-refrigerant main pipe 3-reflux main pipe

4-refrigerator 5-water tank 6-water pump

7-temperature sensing device 8-temperature sensing probe 9-temperature monitoring device

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

The in-situ sludge freezing pretreatment device shown in the figure 1 comprises a freezing pipe 1 which is vertically inserted into a sludge field to be treated, wherein an inlet and an outlet of the freezing pipe are respectively communicated to a refrigerant main pipe 2 and a backflow main pipe 3 which are laid on the soil surface, the backflow main pipe 3 is communicated to a refrigerator 4, and the refrigerator 4 is communicated to the refrigerant main pipe 2 through a water tank 5 and a water pump 6 in sequence through pipelines.

And a temperature sensing device 7 for displaying temperature information outwards is arranged in the refrigerant main pipe 2 and the backflow main pipe 3. The device also comprises a temperature sensing probe 8 which is arranged in the sludge to be treated and used for showing temperature information outwards. A temperature monitoring device 9 for displaying temperature information outwards to identify whether the refrigerator 4 is in normal operation is arranged in a cooling tower cooling water circulation pipeline in the refrigerator 4.

The refrigerant main pipe 2 and the backflow main pipe 3 wrap the heat insulation outer layer.

During specific construction and use, the temperature of the saline solution can be reduced to-28 to-20 ℃ through the refrigerating machine 4 unit, then the refrigerant solution is conducted to the freezing pipe 1, the freezing pipe 1 is vertically inserted into the sludge landfill, heat of sludge in the sludge landfill is continuously absorbed in the conduction process, the sludge is frozen, and then the sludge returns to the refrigerating machine 4 to be subjected to a circulating freezing process again. Generally, the output temperature of the initial salt water solution is-28 ℃ to-25 ℃, and the output temperature of the middle stage and the final stage is-22 ℃ to-20 ℃, so that the average temperature of the sludge can be reduced to about-5 ℃, the strength of the frozen sludge can reach 1.0mpa without collapse, and a sludge frozen body is formed. After the sludge is frozen, the diffusion rate of odor molecules is greatly reduced under the low-temperature effect. The sludge frozen body has proper structural strength and provides a working interface for sludge excavation. After the sludge is frozen and then thawed, the internal physical properties of the sludge are changed, microbial cells are broken to release intracellular water, and after subsequent dehydration treatment, the water content can reach lower.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, and that various changes and modifications may be made, which are within the scope of the appended claims.

Claims

1. The in-situ sludge freezing pretreatment device is characterized by comprising a freezing pipe vertically inserted into a sludge field to be treated, wherein an inlet and an outlet of the freezing pipe are respectively communicated to a refrigerant main pipe and a backflow main pipe which are paved on a soil surface, the backflow main pipe is communicated to a refrigerator, and the refrigerator is communicated to the refrigerant main pipe through a water tank and a water pump in sequence through pipelines.

2. The in-situ sludge freezing and pretreatment device as claimed in claim 1, wherein a temperature sensing device for displaying temperature information outwards is installed in the refrigerant main pipe and the return main pipe.

3. The in-situ sludge freezing pretreatment device according to claim 1, further comprising a temperature sensing probe disposed in the sludge to be treated for externally displaying temperature information.

4. The in-situ sludge freezing pretreatment device according to claim 1, wherein a temperature monitoring device for displaying temperature information outwards to identify whether the refrigerator is operating normally is installed in a cooling water circulation pipeline of the cooling tower in the refrigerator.

5. The in-situ sludge freezing pretreatment device according to claim 1, wherein the refrigerant main pipe and the return main pipe are wrapped with a heat insulation outer layer.