CN204803204U - A sludge drying system - Google Patents

Abstract

The utility model provides a sludge drying treatment system. The system includes: a steam compressor, a heater, a vacuum dryer, a dust remover and a purification device; the steam compressor is connected with the heater; Sludge inlet, sludge outlet, steam inlet, steam outlet, condensed water outlet and non-condensable gas outlet; the heater is connected to the steam inlet of the vacuum dryer, and the steam outlet on the vacuum dryer is connected to the dust collector; The dust collector is connected with the steam compressor; the non-condensable gas discharge port of the vacuum dryer is connected with the purification device. Through the utility model, the moisture in the sludge is evaporated in a vacuum state to form steam, and at the same time, dry sludge is obtained. Since the steam generated by sludge evaporation is pressurized and heated, it can be recycled as a heat source and the boiling point of water is lowered, which can greatly reduce the energy consumption of sludge drying. At the same time, the low-temperature evaporation method produces less odor, which avoids environmental pollution caused by the odor generated by sludge treatment.

Description

A sludge drying system

technical field

The utility model relates to the technical field of environmental protection, in particular to a sludge drying treatment system.

Background technique

With the development of my country's sewage treatment industry and the improvement of sewage treatment capacity, the sludge production has increased sharply. Relevant people estimate that if the sludge production increases at this rate, the total amount will reach 35.6 million tons in 2015. According to statistics, at present, only a small part of the sludge in urban sewage treatment plants across the country is incinerated, landfilled and reused, and most of the sludge has not been standardized. The environment poses a serious threat, and sludge disposal has become another technical problem faced by sewage treatment.

Sludge disposal methods mainly include landfill, incineration and biological composting. The follow-up utilization of sludge mainly depends on the level of water content. Only when the water content of sludge is lower than 50% is it suitable for incineration, and when the water content of sludge is lower than 60%, it can be composted. The rate is still above 80%. Therefore, sludge drying is the key to solve the problem of sludge disposal.

The sludge drying process can be mainly divided into thermal drying, solar drying, biological drying and hydrothermal drying. The thermal drying method belongs to the traditional thermal sludge drying method and is currently the most widely used and mature drying method. Common thermal drying technologies for sludge include direct drying (fluidized bed drying, drum drying, etc.), indirect drying (thin layer drying, slurry drying, etc.), radiation drying (belt drying, etc.) drying, spiral drying, etc.), and its equipment manufacturers are mainly in developed countries such as the United States, France, Germany, Belgium, and Italy.

The sludge drying equipment entering the Chinese market generally adopts thermal drying technology, which consumes a lot of energy in operation, causing a great burden to the enterprise, and the excessively high energy consumption does not meet the requirements of my country's energy conservation and emission reduction. Moreover, in order to increase the evaporation intensity of sludge water during sludge drying, the operating temperature is relatively high. The drying treatment of sludge is not only dehydration, but also has the effect of heat treatment. The odor generated by sludge during heat treatment will seriously affect the environment. . Moreover, even under high temperature conditions, some pathogenic bacteria and parasites survive and pollute the surrounding environment with the discharge of sludge. In addition, the temperature of the sludge after drying treatment is very high, which is very inconvenient for subsequent treatment such as transportation and soil improvement.

Facing the demand of the domestic sludge treatment market, it is very urgent to develop a sludge drying mechanism with low energy consumption, less pollution, easy treatment and safety.

Utility model content

In view of the above problems, the utility model is proposed to provide a sludge drying treatment system that overcomes the above problems or at least partially solves the above problems.

In order to solve the above problems, the utility model provides a sludge drying treatment system, including:

Steam compressors, heaters, vacuum dryers, dust collectors and purification units;

The steam compressor is connected with the heater;

The vacuum dryer is provided with a sludge feed port, a sludge discharge port, a steam inlet, a steam outlet, a condensed water discharge port and a non-condensable gas discharge port;

The heater is connected to the steam inlet of the vacuum dryer, and the steam outlet on the vacuum dryer is connected to the dust remover;

The dust collector is connected with the steam compressor;

The non-condensable gas discharge port of the vacuum dryer is connected with the purification device.

Optionally, the heater is an electric heater or a steam heater.

Optionally, the steam compressor is a variable frequency steam compressor.

Optionally, the condensed water outlet of the vacuum drier is connected to sewage treatment equipment.

According to this utility model, the sludge drying treatment system includes a steam compressor, a heater, a vacuum dryer, a dust collector and a purification device, and the vacuum dryer is provided with a sludge inlet, a sludge discharge outlet, and a steam inlet. , steam outlet, condensed water outlet and non-condensable gas outlet.

The heater is connected to the steam inlet of the vacuum drier, the steam outlet on the vacuum drier is connected to the dust remover, and the dust remover is connected to the steam compressor, so that The steam compressor evacuates the vacuum dryer, pressurizes the sludge to be treated to the sludge inlet of the vacuum dryer with steam as the heat source, and the vacuum dryer uses indirect heat exchange Transferring the heat of condensation of the steam to the sludge can make the water in the sludge evaporate to form steam in a vacuum state where the pressure is lower than one atmospheric pressure and the evaporation temperature is lower than 100°C, and at the same time dry sludge is obtained, because The water in the sludge is evaporated in a vacuum environment, the boiling point of the water is lowered, and the heat required for water evaporation is reduced, thereby reducing the energy consumption of sludge drying.

Moreover, through the above connection relationship, the steam generated by the evaporation of sludge passes through the steam outlet of the vacuum drier, and after being pressurized and heated by the steam compressor and heated by the heater, it enters the steam inlet of the vacuum drier, so that the sludge The steam generated by evaporation is recycled as a heat source, which can greatly reduce the energy consumption of sludge drying.

The dried sludge is discharged through the sludge discharge port provided on the vacuum dryer. Since the evaporation temperature is less than 100°C, the sludge discharge temperature is low, and the heat taken away by the sludge is less, which further reduces the sludge Drying energy consumption.

Due to the low-temperature evaporation method, there is no overflow of sludge odor. Compared with the traditional high-temperature thermal drying technology, the amount of odor is less, which avoids the environmental pollution caused by the odor generated by sludge treatment.

Since the sludge drying treatment is carried out in a vacuum state, the pathogenic bacteria and parasite eggs in the sludge are inactivated, further avoiding the environmental pollution caused by the treated sludge.

Since the temperature when the sludge is discharged is lowered, the organic matter components of the sludge will not be destroyed, which is convenient for subsequent sludge treatment such as soil improvement.

The steam outlet on the vacuum dryer is connected to the dust remover, and the dust remover is connected to the steam compressor, so that the steam formed by the moisture of the sludge during drying can be dedusted by the dust remover, and the The dust impurities in the circulating gas reduce the risk of wear and dust explosion during sludge drying.

The non-condensable gas discharge port of the vacuum dryer is connected to the purification device, so that the non-condensable gas formed after the steam as a heat source heats the sludge is processed by the purification device to meet the atmospheric emission standard, thereby reducing The waste gas generated by sludge drying treatment will cause secondary pollution to the environment.

The heater can also be set as an electric heater or a steam heater to supplement the heat lost during the operation of the sludge drying treatment system.

The steam compressor can also be set as a variable frequency steam compressor, so that the evaporation temperature can be accurately controlled, avoiding slow evaporation caused by too low evaporation temperature, or energy waste caused by too high evaporation temperature, and further reducing the energy consumption of sludge drying .

The condensed water discharge outlet of the vacuum dryer can also be connected with sewage treatment equipment, and treated to meet discharge standards or reuse standards, reducing the secondary pollution of sewage generated during sludge drying treatment to the environment.

Description of drawings

Fig. 1 is a schematic structural diagram of a sludge drying treatment system according to Embodiment 1 of the present utility model.

Detailed ways

In order to make the above purpose, features and advantages of the utility model more obvious and understandable, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer" The orientation or positional relationship indicated by ", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the machine or element referred to must have a specific orientation, so as to Specific orientation configurations and operations, therefore, should not be construed as limitations on the invention.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The specific implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

Referring to FIG. 1 , it shows a schematic structural view of a sludge drying treatment system in an embodiment of the present invention.

The sludge drying treatment system includes: a steam compressor 2, a heater 4, a vacuum drier 1, a deduster 3 and a purification device 5; the connection relationship is: the steam compressor 2 is connected to the heater 4; The vacuum dryer 1 is provided with a sludge feed port 11, a sludge discharge port 12, a steam inlet 13, a steam outlet 14, a condensed water discharge port 15 and a non-condensable gas discharge port 16; The steam inlet 13 of the dryer 1 is connected, and the steam outlet 14 on the vacuum dryer 1 is connected with the dust remover 3; the dust remover 3 is connected with the steam compressor 2; The condensed gas discharge port 16 is connected with the purification device 5 .

The design principle of the sludge drying treatment system of the present utility model is that by connecting the heater 4 to the steam inlet 13 of the vacuum dryer 1, the steam outlet 14 on the vacuum dryer 1 is connected to the The dust remover 3 is connected, and the dust remover 3 is connected with the steam compressor 2, and the steam compressor 2 vacuumizes the vacuum dryer 1, and transports the sludge to be treated to the steam as The sludge feed port 11 of the vacuum dryer 1 of the heat source, the vacuum dryer 1 transfers the heat of condensation of the steam to the sludge through indirect heat exchange, so that the moisture in the sludge can be kept under low pressure. Evaporate to form steam in a vacuum state with an atmospheric pressure and an evaporation temperature lower than 100°C, and obtain dry sludge at the same time. Since the water in the sludge evaporates in a vacuum environment, the boiling point of water decreases, reducing the heat required for water evaporation, thereby Reduced energy consumption for sludge drying.

The boiling point of water in a vacuum negative pressure state is 100°C lower than that at normal temperature and pressure. For example, at a pressure of 19.6kPa, the boiling point of water can be reduced to 60°C; therefore, controlling the lower evaporation temperature can make the pollution The water in the sludge boils and evaporates, reducing the amount of heat required to evaporate the water in the sludge.

And, through the above connection relationship, the steam generated by the evaporation of sludge passes through the steam outlet 14 of the vacuum drier 1, and after being pressurized and heated by the steam compressor 2 and heated by the heater 4, the steam entering the vacuum drier 1 Inlet 13, the steam generated by sludge evaporation can be recycled as a heat source, and the steam heat can be reused to improve thermal efficiency and reduce energy consumption. Compared with conventional thermal drying technology, 60% energy consumption can be saved, which can greatly reduce sludge drying. energy consumption.

The dried sludge is discharged through the sludge discharge port 12 provided on the vacuum dryer 1. Since the evaporation temperature is less than 100°C, the sludge discharge temperature is low, and the heat taken away by the sludge is less, which further reduces the Energy consumption for sludge drying.

Due to the low-temperature evaporation method, there is no overflow of sludge odor. Compared with the traditional high-temperature heat drying technology, the amount of odor is less, which avoids the environmental pollution caused by the odor generated by sludge treatment;

Since the sludge drying treatment is carried out in a vacuum state, the pathogenic bacteria and parasite eggs in the sludge are inactivated, further avoiding the environmental pollution caused by the treated sludge.

Since the temperature when the sludge is discharged is lowered, the organic matter components of the sludge will not be destroyed, which is convenient for subsequent sludge treatment such as soil improvement.

The steam outlet 14 on the vacuum dryer 1 is connected to the dust remover 3, and the dust remover 3 is connected to the steam compressor 2, so that the steam formed by the moisture of the sludge during drying can be dedusted The treatment removes the dust impurities in the circulating gas, reduces the wear hazard of the steam compressor and the risk of dust explosion.

By connecting the non-condensable gas discharge port 16 of the vacuum dryer 1 with the purification device 5, the non-condensable gas formed after the steam heating the sludge as a heat source passes through the non-condensable gas of the vacuum dryer 1 The discharge port 16 enters the purification device 5 for treatment to meet the atmospheric discharge standard, thereby reducing the secondary pollution of the environment by the waste gas generated by the sludge drying treatment.

In the embodiment of the present utility model, optionally, the heater 4 can be set as an electric heater or a steam heater to supplement the heat lost during the operation of the sludge drying treatment system.

In the embodiment of the utility model, optionally, the steam compressor 2 can be set as a variable frequency steam compressor, which can accurately control the evaporation temperature, avoiding slow evaporation caused by too low evaporation temperature, or excessively high evaporation temperature. Energy waste, further reducing the energy consumption of sludge drying.

In the embodiment of the utility model, optionally, the condensed water outlet 15 of the vacuum dryer 1 is connected to the sewage treatment equipment, so that the condensed water formed after the steam as a heat source heats the sludge enters the sewage treatment equipment , treated to meet the discharge standard or reuse standard, reducing the secondary pollution to the environment caused by the sewage generated during the sludge drying treatment.

A kind of sludge drying treatment system provided by the utility model has been introduced in detail above. In this paper, specific examples have been used to illustrate the principle and implementation of the utility model. The description of the above examples is only used to help understand the utility model. new method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not It should be understood as a limitation of the present utility model.

Claims (4)

1. a drying sludge treatment system, is characterized in that, comprising:

Vapour compressor, well heater, vacuum drier, fly-ash separator and refining plant;

Described vapour compressor is connected with described well heater;

Described vacuum drier is provided with sludge inlet, sludge outlet, steam-in, vapour outlet, condensed water discharge outlet and non-condensable gas discharge outlet;

Described well heater is connected with the described steam-in of described vacuum drier, and the described vapour outlet on described vacuum drier is connected with described fly-ash separator;

Described fly-ash separator is connected with described vapour compressor;

The non-condensable gas discharge outlet of described vacuum drier is connected with described refining plant.

2. system according to claim 1, is characterized in that:

Described well heater is electric heater or steam heater.

3. system according to claim 1, is characterized in that:

Described vapour compressor is frequency conversion type vapour compressor.

4. system according to claim 1, is characterized in that:

The condensed water discharge outlet of described vacuum drier is connected with sewage disposal device.