CN215288496U - Novel closed-circuit sludge heat pump drying system - Google Patents

Abstract

The utility model discloses a novel closed-circuit sludge heat pump drying system, which comprises a drying chamber, a closed circulating air duct, a compressor, a condenser, an inner evaporator and an outer evaporator; a bypass connected in parallel is arranged in the heat absorption section of the closed circulation air duct, and a bypass valve is arranged in the bypass; the inner evaporator is arranged in the heat absorption section, and a moisture exhaust port is arranged at the rear side of the inner evaporator; the condenser is arranged in the heat supplementing section of the closed circulating air duct, the rear side of the condenser is provided with a fan, the outlet of the condenser is divided into two branches after passing through an expansion valve, the two branches are respectively connected with the inlets of the inner evaporator and the outer evaporator through valves, and the outlets of the inner evaporator and the outer evaporator are communicated with the input port of the compressor; the utility model discloses novel structure can acquire the circumstances such as temperature, humidity in the closed circulation wind channel through the sensor to combine the job schedule in the drying chamber, opening and close of evaporimeter in the control, carry out the regulation of adaptability to the humiture in the closed circulation wind channel.

Description

Novel closed-circuit sludge heat pump drying system

Technical Field

The utility model belongs to the technical field of the sludge drying, concretely relates to novel closed circuit formula sludge heat pump mummification system.

Background

Along with the acceleration of the urbanization process and the rapid development of the industry in China, the treatment of urban sewage and industrial sewage is improved, a large amount of sludge is inevitably generated in the collection and treatment processes of the urban sewage and the industrial sewage, the sludge has the characteristics of high organic matter content, easy decay and odor generation and high water content, and contains various toxic and harmful substances, thereby greatly threatening the life and health of people.

At present, sludge drying and dehumidifying mainly adopts direct heating, namely, sludge is heated to more than 100 ℃ by using forms of steam, flue gas, electric heating and the like, so that moisture of the sludge is changed into water vapor to be directly discharged into the atmosphere, and the drying mode has large pollution and low drying efficiency.

The existing method is that high-temperature air is introduced into an inlet of a drying chamber to dry sludge in the drying chamber, moisture is discharged from an outlet of the drying chamber, the existing structure is a single circulation path, a condenser is arranged in the circulation path and is connected with a compressor and an evaporator which are positioned in the external environment, and heat is supplemented in the circulation path.

Disclosure of Invention

Defect and problem to existing equipment existence, the utility model provides a novel closed circuit formula sludge heat pump mummification system, the effectual closed circuit formula heat pump mummification system who exists among the existing equipment of having solved is at the initial stage of mummification, and it is lower to heat up slower and work efficiency to and at mummification later stage, the too abundant problem of system's heat.

The utility model provides a scheme that its technical problem adopted is: a novel closed-circuit sludge heat pump drying system comprises a drying chamber, a closed circulating air duct, a compressor, a condenser, an inner evaporator and an outer evaporator; a bypass connected in parallel is arranged in the heat absorption section of the closed circulation air duct, and a bypass valve is arranged in the bypass; the inner evaporator is arranged in the heat absorption section, and a moisture exhaust port is arranged at the rear side of the inner evaporator; the condenser sets up in the concurrent heating section in closed circulation wind channel, and the rear side of condenser is provided with the fan, the delivery outlet of compressor with the import intercommunication of condenser, the export of condenser divide two branches behind the expansion valve, and two branches are respectively through the access connection of valve with interior evaporimeter and outer evaporimeter, the export of interior evaporimeter and outer evaporimeter and the input port intercommunication of compressor, outer evaporimeter is arranged in external environment.

Furthermore, a water-cooling pipe is arranged in the heat absorption section, and the front side of the evaporator in the water-cooling pipe is arranged.

Furthermore, the valve is a solenoid valve, and the expansion valve is an electronic expansion valve.

Furthermore, both sides of the front side and the rear side of the compressor are provided with temperature sensors, an air inlet of the drying chamber is provided with a temperature sensor and a humidity sensor, an outlet of the drying chamber is provided with a temperature sensor, a humidity sensor and a wind speed transmitter, and a frequency converter of the compressor is connected with the PID controller.

Further, a fan is arranged on the outer side of the outer evaporator.

The utility model has the advantages that: firstly, the utility model is provided with an internal evaporator which can absorb heat in the closed circulation air duct and a condenser which can release heat in the closed circulation air duct in sequence according to the direction of the circulation air in the closed circulation air duct; and the bypass is connected in parallel with the inner evaporator, and a bypass valve is arranged on the bypass and used for controlling the opening and closing of the bypass.

Thereby the utility model provides an have the condenser that lets the temperature rise in the closed circulation wind channel and let the evaporimeter that the temperature reduces, wherein the condenser is used for interior concurrent heating to closed circulation wind channel, interior evaporimeter is used for absorbing heat in the closed circulation wind channel, and this heat absorption place is close to the export of drying chamber, can make the high humid air cooling of drying chamber exit, moisture liquefaction in the air accelerates, and discharge from moisture exhaust department, including the evaporimeter is in under the standby state, let outer evaporimeter work, absorb the heat from the external environment, realize the circulation of refrigerant with the condenser cooperation, the bypass can selective work simultaneously, can shunt the drying chamber combustion gas, make the accessible quick pass through of gas and avoid interior evaporimeter department, accelerate gas circulation, and at condenser department concurrent heating, realize rapid heating.

Therefore, the utility model discloses novel structure can acquire the circumstances such as temperature, humidity in the closed circulation wind channel through the sensor to combine the job schedule in the drying chamber, opening and close of evaporimeter in the control carries out the regulation of adaptability to the humiture in the closed circulation wind channel, provides multiple mode for the drying chamber work, has improved the stoving effect of mud.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a general flow chart of the control system.

FIG. 3 is a block diagram of a heating module control flow.

Fig. 4 is a control flow block diagram of the constant temperature and humidity module.

The reference numbers in the figures are: the device comprises a drying chamber 1, a closed circulating air duct 2, a bypass 3, a bypass valve 4, an inner evaporator 5, a condenser 6, a fan 7, a compressor 8, an electronic expansion valve 9, an electromagnetic valve I10, an electromagnetic valve II 11, an outer evaporator 12, a water cooling pipe 13, a humidity sensor 14, a temperature sensor 15, a wind speed transmitter 16 and a moisture exhaust port 17.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1: the embodiment aims to provide a novel closed-loop sludge heat pump drying system, which is mainly used for drying sludge, and aims to solve the problems that the conventional closed-loop heat pump drying system is slow in temperature rise and low in work efficiency in the early drying stage, and the system is excessive in heat in the later drying stage, the embodiment provides the novel closed-loop heat pump drying system which is provided with two loops, namely a refrigerant flowing loop and an air flowing loop, wherein the refrigerant loop comprises a compressor 8, an inner evaporator 5, an outer evaporator 12, an expansion valve and a condenser 6, and is used for heating air in sludge low-temperature drying equipment by using the outer evaporator 12 to absorb heat of the external environment when the equipment is started; the air flow loop comprises a condenser 6, a fan 7, a drying chamber 1, a closed circulation air duct 2, a bypass valve 4, a moisture discharge port 17 and an inner evaporator 5, wherein the fan 7 provides power for air to flow through the whole system, sludge is placed in the drying chamber as a material to be dried, the condenser 6 heats air as a heat source to enable the air to reach a set drying temperature, the inner evaporator 5 serves as a cold source to cool and dehumidify the flowing hot and humid air, so that the drying capacity is increased, when the system humidity is low, the bypass valve 4 can enable the hot air discharged from the drying chamber 1 to not cool through the inner evaporator 5, and the heating efficiency of the whole system can be highest.

Structurally, as shown in fig. 1, a novel closed-circuit sludge heat pump drying system comprises a drying chamber 1, a closed-type circulating air duct 2, a compressor 8, a condenser 6, an inner evaporator 5 and an outer evaporator 12; the closed circulation air duct comprises a heat absorption section close to an outlet of the drying chamber 1 and a heat supplementing section close to an inlet of the drying chamber, a bypass 3 connected in parallel is arranged in the heat absorption section, a bypass valve 4 is arranged in the bypass 3, an inner evaporator 5 is arranged in the heat absorption section, and a moisture exhaust port 17 is arranged at the rear side of the inner evaporator 5; the condenser 6 is arranged in the heat supplementing section of the closed type circulating air duct 2, the fan 7 is arranged on the rear side of the condenser 6, namely, high-humidity air discharged from the outlet of the drying chamber 1 can circulate through two paths, wherein one path enters the heat supplementing section through a bypass without obstacles and can be closed through a bypass valve, the other path enters the heat supplementing section through an inner evaporator and a moisture discharging port, and the section is a normally open section.

The output port of the compressor 8 is communicated with the inlet of the condenser 6, the outlet of the condenser 6 is divided into two branches after passing through an expansion valve, the two branches are respectively connected with the inlets of the inner evaporator 5 and the outer evaporator 12 through valves, the outlets of the inner evaporator 5 and the outer evaporator 12 are communicated with the input port of the compressor 8, the outer evaporator 5 is positioned in the external environment, and the outer side of the outer evaporator 12 is provided with a fan.

In the embodiment, the valve is a solenoid valve, the expansion valve is an electronic expansion valve, and the refrigerant cycle is also divided into two paths of cycles, wherein one path of the cycle is an external heat absorption cycle formed by the compressor 8, the condenser 6, the electronic expansion valve 9, the solenoid valve I10 and the external evaporator 12, and the cycle absorbs heat from the external environment and releases heat at the condenser; and the other path is a compressor 8, a condenser 6, an electronic expansion valve 9, an electromagnetic valve II 11 and an internal evaporator 5 to form an internal heat absorption cycle, and the cycle absorbs heat from closed circulating air.

In the embodiment, at the initial stage of operation of the equipment, the equipment starts a heating mode, the electromagnetic valve I is opened, the outer evaporator works, the frequency of the compressor is controlled by the frequency converter, the compressor is enabled to keep the maximum frequency operation, refrigerant flowing through the expansion valve enters the outer evaporator through the electromagnetic valve I to absorb a large amount of heat in the outdoor environment, then the refrigerant is sucked by the compressor to complete the refrigerant circulation, and in the process, the air bypass pipeline is always opened.

When the outlet temperature of the drying chamber is higher than or equal to the set drying temperature, the equipment starts to run at a constant temperature, the electromagnetic valve I is closed, the electromagnetic valve II is opened, the inner evaporator works at the moment, the refrigerant flowing through the expansion valve enters the inner evaporator through the electromagnetic valve II to absorb a large amount of heat and condense high-temperature and high-humidity gas exhausted from the drying chamber, and then the refrigerant is sucked by the compressor to finish the refrigerant circulation.

In the heating mode, the air bypass valve is always opened, so that a part of air in the sludge drying chamber directly enters the condenser without passing through the inner evaporator to continue heating circulation, and the temperature of the sludge drying chamber can be quickly increased; in the drying mode, if the humidity of the sludge drying chamber is greater than the set drying humidity, the air bypass valve is closed, the damp and hot air from the drying chamber is cooled by the cooling device and then enters the inner evaporator, the air humidity in the drying chamber can be reduced, and when the humidity of the sludge drying chamber is less than the set drying humidity, the air bypass valve is opened.

Example 2: this example is substantially the same as example 1, except that: the present embodiment further illustrates the operation mode of the drying process.

In this embodiment, temperature sensors 15 are disposed on both sides of the front and rear sides of the compressor 8, a temperature sensor 15 and a humidity sensor 14 are disposed at an air inlet of the drying chamber 1, a temperature sensor 15, a humidity sensor 14 and an air speed transmitter 16 are disposed at an outlet of the drying chamber, and a frequency converter of the compressor 8 is connected to the PID controller.

In order to maintain the stable state of the drying chamber, a PID control mode is kept, a PID controller forms a control deviation according to a given value and an actual output value, the deviation forms a control quantity through linear combination according to proportion, integral and differential, a controlled object is controlled, and the heating capacity of a compressor is controlled by adjusting the output frequency of a compressor frequency converter.

When the temperature of the outlet air of the drying chamber is lower than the set drying temperature, the equipment starts a heating mode, the solenoid valve I is opened, the solenoid valve II is closed, the evaporator I works at the moment, the evaporator II does not work, the compressor keeps the maximum frequency operation by controlling the frequency of the compressor, the refrigerant flowing through the expansion valve enters the evaporator I through the solenoid valve I to absorb a large amount of heat in the outdoor environment, and then the refrigerant is sucked by the compressor to complete the refrigerant circulation. The air bypass valve is always open during start-up in the heating mode.

And when the outlet temperature of the drying chamber is greater than or equal to the set drying temperature, the equipment starts a constant temperature and humidity mode. The electromagnetic valve I is closed, the electromagnetic valve II is opened, the evaporator I does not work at the moment, and the evaporator II works. The refrigerant flowing through the expansion valve enters the evaporator II through the solenoid valve II, absorbs a large amount of heat and condenses the high-temperature and high-humidity gas discharged from the drying chamber, and then the refrigerant is sucked by the compressor, thereby completing the refrigerant cycle. In order to maintain the stable state of the drying chamber, the compressor frequency converter uses a PID control mode to control the heating capacity of the compressor by adjusting the output frequency of the compressor frequency converter, thereby keeping the temperature of the drying chamber stable.

In the heating mode, the air bypass valve is always opened, so that a part of air in the sludge drying chamber directly enters the condenser without passing through the evaporator II to continue heating circulation, and the temperature of the sludge drying chamber can be quickly increased; under the constant temperature mode, if the humidity of mud drying chamber is greater than when setting for the stoving humidity, the air bypass valve closes, and the moist heat air that comes from the drying chamber is in the middle of the cooling device cooling back reentrant evaporimeter II, can reduce the air humidity in the drying chamber, and when the humidity of mud drying chamber was less than when setting for the stoving humidity, the air bypass valve opened.

Example 3: this example is substantially the same as example 1, except that: this embodiment adds water cooling tubes 13 at the heat absorption section.

In this embodiment, a water-cooling pipe 13 is arranged in the heat absorption section, the condenser in this embodiment heats air as a heat source to make the air reach a set drying temperature, the evaporator and a cooling water pipe (which is usually not started and is started when the humidity is too high) serve as cold sources to cool and dehumidify the passing humid hot air, so that the drying capacity is increased, and when the humidity of the system is low, the bypass valve can make the hot air exhausted from the drying chamber not pass through the evaporator II to be cooled, so that the heating efficiency of the whole system is highest.

Claims (5)

1. The utility model provides a novel closed circuit formula sludge heat pump mummification system which characterized in that: comprises a drying chamber, a closed circulating air duct, a compressor, a condenser, an inner evaporator and an outer evaporator; a bypass connected in parallel is arranged in the heat absorption section of the closed circulation air duct, and a bypass valve is arranged in the bypass; the inner evaporator is arranged in the heat absorption section, and a moisture exhaust port is arranged at the rear side of the inner evaporator; the condenser sets up in the heat release section of closed circulation wind channel, and the rear side of condenser is provided with the fan, the delivery outlet of compressor with the import intercommunication of condenser, the export of condenser divide two branches behind the expansion valve, and two branches are respectively through the access connection of valve with interior evaporimeter and outer evaporimeter, and the export of interior evaporimeter and outer evaporimeter communicates with the input port of compressor, outer evaporimeter is arranged in external environment.

2. The novel closed-circuit sludge heat pump drying system of claim 1, wherein: and a water-cooling pipe is arranged in the heat absorption section, and the front side of an evaporator in the water-cooling pipe is arranged.

3. The novel closed-circuit sludge heat pump drying system of claim 1, wherein: the valve is an electromagnetic valve, and the expansion valve is an electronic expansion valve.

4. The novel closed-circuit sludge heat pump drying system of claim 3, wherein: temperature sensors are arranged on the two sides of the front side and the rear side of the compressor, a temperature sensor and a humidity sensor are arranged at an air inlet of the drying chamber, a temperature sensor, a humidity sensor and a wind speed transmitter are arranged at an outlet of the drying chamber, and a frequency converter of the compressor is connected with the PID controller.

5. The novel closed-circuit sludge heat pump drying system of claim 1, wherein: and a fan is arranged on the outer side of the outer evaporator.

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