CN204474516U - A kind of sludge drying system - Google Patents

Abstract

The utility model discloses a sludge drying system. The sludge is dehydrated and loaded into a drying chamber; the humid air of the sludge in the drying chamber flows out from the air outlet of the drying chamber, is heated by a first regenerator and enters a heat pump evaporator. The wet air is discharged due to the cooling of condensed water; the dry and cold air after dehumidification is heated as hot air when it flows through the heat pump condenser and sent to the drying chamber to dry the sludge; the return air after drying the sludge passes through the outlet of the drying chamber. The tuyere flows out and returns to the heat pump evaporator through the first regenerator for the aforementioned cycle to continuously discharge condensed water until the sludge is dried; during the entire working process of the heating and drying device, the air circulation channel through which the air flows is a closed cycle Air duct; the dried sludge is sent out of the drying room to obtain dried sludge; in this way, the closed dehumidification and drying method and the heat pump principle are used to recover steam condensation heat, no waste gas and waste heat emission, no noise pollution, and it is more energy-saving , environmental protection, safety, and easy to use and manage.

Description

A sludge drying system

technical field

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

Background technique

With the improvement of environmental protection awareness, the urban sewage treatment industry has developed rapidly, the output of urban sludge is increasing day by day, and the disposal and development and utilization of sludge have increasingly attracted people's attention. The drying treatment of sludge can make sludge agricultural and fuel Disposal methods such as recycling, incineration, and even reducing landfill sites are possible. Most of the existing municipal sludge and factory sludge treated by sewage treatment plants are composted or dried in the sun, and then dried with steam provided by waste heat boilers, which consume more energy and have low drying efficiency. At the same time, Its drying treatment equipment occupies a large area and is not easy to manage.

Therefore, it is necessary to develop a new sludge drying method to solve the above problems.

Utility model content

In view of this, the utility model aims at the deficiencies of the existing technology, and its main purpose is to provide a sludge drying system, which adopts the closed dehumidification and drying method and the heat pump principle to recover steam condensation heat, no waste gas and waste heat discharge, no Noise pollution, it is more energy-saving, environmentally friendly, safer, and easy to use and manage.

In order to achieve the above object, the utility model adopts the following technical solutions:

A sludge drying system, including a box body, a drying chamber arranged in the box body, and a heating and drying device; the heating and drying device includes a heat pump evaporator, a heat pump compressor, a heat pump condenser, an expansion valve, a first heat recovery The heat pump evaporator, heat pump compressor, heat pump condenser, and expansion valve are connected in sequence to form a refrigeration cycle system; the air outlet of the drying chamber passes through the first regenerator and the gas inlet of the heat pump evaporator The gas outlet of the heat pump evaporator is connected to the gas inlet of the heat pump condenser through the second regenerator, and the gas outlet of the heat pump condenser is connected to the air inlet of the drying chamber, thus forming a closed circulation air duct. There is a circulating fan; and, the bottom of the heat pump evaporator is provided with a condensed water discharge device.

As a preferred solution, the drying chamber is equipped with a belt conveying device for outputting dry sludge, the top of the drying chamber is provided with a dry sludge output port, and the outside of the dry sludge output port is connected with a sludge tank for storing dry sludge. warehouse.

As a preferred solution, an input port for sludge to be dried is provided at the bottom of the drying chamber, and a filter press for dehydrating the sludge is connected to the outside of the input port for sludge to be dried via a sludge conveying device.

Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly recovers the steam condensation heat by adopting the closed dehumidification and drying method and the heat pump principle without external addition. Steam and other external heating sources are used for drying without consuming a lot of electric energy, greatly reducing operating costs, no waste gas and waste heat emissions, and no noise pollution. Easy to use and manage.

In order to illustrate the structural features and functions of the utility model more clearly, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of the sludge drying system in the embodiment of the present utility model;

Fig. 2 is a schematic flow chart of an embodiment of the present invention.

Explanation of the accompanying drawings:

10. Cabinet 11. Drying room

20. Heat pump evaporator 30. Heat pump compressor

40. Heat pump condenser 50. Expansion valve

60. The first regenerator 70. The second regenerator

80. The first circulation fan 90. The second circulation fan

100. Condensed water discharge device.

Detailed ways

Please refer to Fig. 1 to Fig. 2, which shows the concrete structure of the embodiment of the present invention; .

The bottom of the drying chamber 11 is provided with an input port for sludge to be dried, and the outside of the input port for the sludge to be dried is connected with a filter press for dehydrating the sludge through a sludge conveying device; The belt conveying device for sludge, the top of the drying chamber 11 is provided with a dry sludge output port, and the outside of the dry sludge output port is connected with a sludge bin for storing the dry sludge.

The heating and drying device includes a heat pump evaporator 20, a heat pump compressor 30, a heat pump condenser 40, an expansion valve 50, a first regenerator 60 and a second regenerator 70; the heat pump evaporator 20, the heat pump compressor 30, The heat pump condenser 40 and the expansion valve 50 are connected in turn to form a refrigeration cycle system; the air outlet of the drying chamber 11 is connected to the gas inlet of the heat pump evaporator 20 through the first regenerator 60, and the gas outlet of the heat pump evaporator 20 is connected through the first The second regenerator 70 is connected to the gas inlet of the heat pump condenser 40, and the gas outlet of the heat pump condenser 40 is connected to the air inlet of the drying chamber 11, thus forming a closed circulation air duct, which is equipped with a circulation fan; and A condensed water discharge device 100 is provided at the bottom of the heat pump evaporator 20 .

In this embodiment, the setting of the aforementioned first regenerator 60 and second regenerator 70 makes the temperature of the air entering the heat pump evaporator 20 drop and the temperature of the air entering the heat pump condenser 40 rises; the regenerative cycle makes the heat pump evaporator The 20 cooling capacity is used to reduce the air temperature (ineffective cooling process), and the cooling capacity is used to increase the cooling and dehumidification process, so that the optimal evaporation temperature and optimal dehumidification capacity of the heat pump drying will increase; the dehumidification and drying of the heat pump with the heat recovery cycle is more than ordinary Heat pump drying can save energy by more than 30%.

In this embodiment, as shown in Figure 1, the aforementioned circulating fan includes a first circulating fan 80 arranged at the air outlet of the heat pump condenser 40 and a second circulating fan 90 arranged in the drying chamber 11, using the second circulating fan 90 makes the hot air in the drying chamber 11 evenly distributed and circulated, and the hot air circulates in the drying chamber 11, and all parts of the sludge can be dried evenly; at the same time, the first circulation fan 80 makes the air in the drying chamber 11 and the drying chamber 11 A circulating flow is formed between the external heating and drying devices.

When using the aforementioned sludge drying system for sludge drying treatment, the general steps are as follows:

(1) The sludge is dehydrated by a membrane filter press, and the dehydrated sludge is loaded into the drying chamber 11 through the sludge conveying device.

(2) After the dehydrated sludge is loaded into the drying chamber 11, it should stay for 15 to 45 minutes, and then proceed to step (2) to start the heating and drying device.

(3) The heating and drying device starts to work, and the humid air of the sludge in the drying chamber 11 flows out from the air outlet of the drying chamber 11, is heated by the first regenerator 60 and enters the heat pump evaporator 20, and the low-pressure refrigerant in the heat pump evaporator 20 The heat absorbed by the humid air changes from a liquid state to a gas state, and the humid air forms condensed water due to cooling down and is discharged by the condensed water discharge device 100; the low-pressure refrigerant from the heat pump evaporator 20 is boosted by the heat pump compressor 30 and sent to the heat pump condenser 40. When the dehumidified dry and cold air passes through the second regenerator 70 and flows through the heat pump condenser 40, the high-pressure refrigerant inside the heat pump condenser 40 releases heat due to condensation, and the dry and cold air is heated into hot air and passed through the circulating fan to transfer the hot air Pump it to the drying chamber 11 to dry the sludge; the return air after drying the sludge flows out through the air outlet of the drying chamber 11 and returns to the first regenerator 60 to be heated and enter the heat pump evaporator 20 for the aforementioned cycle to continuously discharge condensed water until the sludge is dry.

During the whole working process of the heating and drying device, the circulating air channel through which the air flows is a closed circulating air channel; the whole system is closed and circulated without adding other auxiliary heating, and the waste gas from sludge drying and wet air are mixed and refrigerated by the dryer. The circulation system cools down and dehumidifies, and is reused for the internal circulation and drying of the entire drying system, so as long as the equipment runs continuously, excess smoke will not be generated to cause air pollution.

(3) The dried sludge is sent out of the drying chamber 11 to obtain dried sludge; in this embodiment, the top of the drying chamber 11 is provided with a dry sludge outlet, and the outside of the dry sludge outlet is connected with an outlet for storing dried sludge. The sludge bin for mud is output to the sludge bin through the belt conveying device.

The key point of the design of this utility model is that it mainly adopts the closed dehumidification drying method and the principle of heat pump to recover steam condensation heat, and does not need to add external heating sources such as steam for drying, does not need to consume a lot of electric energy, greatly reduces operating costs, and has no waste gas Waste heat discharge, no noise pollution, more energy-saving, environmental protection, and safety; and the temperature and humidity of the drying medium are easy to control, free from external influences, and easy to use and manage.

The above are only preferred embodiments of the present utility model, and do not limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model , all still belong to the scope of the technical solution of the utility model.

Claims (3)

1. A sludge drying system, characterized in that: it comprises a casing and a drying chamber arranged in the casing, a heating and drying device; the heating and drying device includes a heat pump evaporator, a heat pump compressor, a heat pump condenser, an expansion Valve, the first regenerator and the second regenerator; the heat pump evaporator, heat pump compressor, heat pump condenser, and expansion valve are connected in sequence to form a refrigeration cycle system; the air outlet of the drying chamber passes through the first regenerator and The gas inlet of the heat pump evaporator is connected, the gas outlet of the heat pump evaporator is connected to the gas inlet of the heat pump condenser through the second regenerator, and the gas outlet of the heat pump condenser is connected to the air inlet of the drying chamber, thus forming a closed circulation air duct, A circulating fan is arranged in the closed circulating air duct; and a condensed water discharge device is arranged at the bottom of the heat pump evaporator. 2. The sludge drying system according to claim 1, characterized in that: the drying chamber is equipped with a belt conveyor for outputting dried sludge, and the top of the drying chamber is provided with a dried sludge output port, and the dried sludge A sludge bin for storing dry sludge is connected to the outside of the output port. 3. The sludge drying system according to claim 1, characterized in that: the bottom of the drying chamber is provided with a sludge input port to be dried, and the sludge input port to be dried is connected with a sludge feeding port via a sludge conveying device. Filter press for mud dewatering.