A kind of sludge drying system
Technical field
The utility model relates to field of sludge treatment technology, refers in particular to a kind of sludge drying system.
Background technology
Along with the raising of environmental consciousness, municipal wastewater treatment field is developed rapidly, the output of municipal sludge grows with each passing day, the disposal of mud and exploitation problem are day by day by people are paid close attention to, the drying and other treatment of mud, makes agricultural sludge, uses as fuel, burns and even become possibility for reducing the treatment processs such as landfill place.The existing municipal sludge through sewage work's process, factory sludge adopt the method for compost or airing mummification mostly, and then providing steam to dry with waste heat boiler etc., its power consumption is more, drying efficiency is not high, simultaneously, its equipment for drying floor space is comparatively large, and it is also not too convenient to manage.
Therefore, need to work out a kind of new sludge drying method and solve the problems referred to above.
Utility model content
In view of this, the utility model is for the disappearance of prior art existence, its main purpose is to provide a kind of sludge drying system, it adopts enclosed removal moisture drying mode and heat pump principle to carry out vapor condensation recovery of heat, without waste gas waste heat discharge, noiselessness pollutes, its more energy-saving and environmental protection, safety, and use management is convenient.
For achieving the above object, the utility model adopts following technical scheme:
A kind of sludge drying system, includes casing and is arranged at kiln, the heat drying apparatus in casing; This heat drying apparatus includes evaporator with heat pump, heat pump compressor, heat pump condenser, expansion valve, the first regenerator and the second regenerator; This evaporator with heat pump, heat pump compressor, heat pump condenser, expansion valve circulate successively and are connected to form cooling cycle system; The air outlet of this kiln is connected with the gas inlet of evaporator with heat pump through the first regenerator, the pneumatic outlet of this evaporator with heat pump is connected with the gas inlet of heat pump condenser through the second regenerator, the pneumatic outlet of heat pump condenser is communicated with the blast inlet of kiln, formation sealing and circulating air channel like this, is configured with recirculation blower in this sealing and circulating air channel; And, be provided with condensate water extraction device bottom this evaporator with heat pump.
As a kind of preferred version, be configured with the belt conveyor for exporting sludge-drying in described kiln, kiln top is provided with sludge-drying delivery port, and sludge-drying delivery port outside is connected the sludge bin had for storing and drying mud.
As a kind of preferred version, be provided with mud input aperture to be dried bottom described kiln, this mud input aperture to be dried outside linking via sludge conveyer, has for the pressure filter of sludge dewatering.
The utility model compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution, it mainly by adopting enclosed removal moisture drying mode and heat pump principle to carry out vapor condensation recovery of heat, carries out drying, without the need at substantial electric energy without the need to external heat sources such as external interpolation steam, working cost reduces greatly, without waste gas waste heat discharge, noiselessness pollutes, its more energy-saving and environmental protection, safety; And the convenient control of the temperature of drying medium, humidity, not by ectocine, use management is convenient.
For more clearly setting forth constitutional features of the present utility model and effect, below in conjunction with accompanying drawing and specific embodiment, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the configuration diagram of sludge drying system in the embodiment of the utility model;
Fig. 2 is the schematic flow sheet of the embodiment of the utility model.
Accompanying drawing identifier declaration:
10, casing 11, kiln
20, evaporator with heat pump 30, heat pump compressor
40, heat pump condenser 50, expansion valve
60, the first regenerator 70, second regenerator
80, the first recirculation blower 90, second recirculation blower
100, condensate water extraction device.
Embodiment
Please refer to shown in Fig. 1 to Fig. 2, that show the concrete structure of the embodiment of the utility model; Kiln 11, heat drying apparatus that this sludge drying system includes casing 10 and is arranged in casing 10.
Be provided with mud input aperture to be dried bottom this kiln 11, this mud input aperture to be dried outside linking via sludge conveyer, has for the pressure filter of sludge dewatering; And be configured with the belt conveyor for exporting sludge-drying in this kiln 11, kiln 11 top is provided with sludge-drying delivery port, and sludge-drying delivery port outside is connected the sludge bin had for storing and drying mud.
This heat drying apparatus includes evaporator with heat pump 20, heat pump compressor 30, heat pump condenser 40, expansion valve 50, first regenerator 60 and the second regenerator 70; This evaporator with heat pump 20, heat pump compressor 30, heat pump condenser 40, expansion valve 50 circulate successively and are connected to form cooling cycle system; The air outlet of this kiln 11 is connected with the gas inlet of evaporator with heat pump 20 through the first regenerator 60, the pneumatic outlet of this evaporator with heat pump 20 is connected with the gas inlet of heat pump condenser 40 through the second regenerator 70, the pneumatic outlet of heat pump condenser 40 is communicated with the blast inlet of kiln 11, formation sealing and circulating air channel like this, is configured with recirculation blower in this sealing and circulating air channel; And, be provided with condensate water extraction device 100 bottom this evaporator with heat pump 20.
In the present embodiment, the setting of aforementioned first regenerator 60 and the second regenerator 70, makes the air themperature entering evaporator with heat pump 20 decline and the rising of the air themperature of heat pump condenser 40 of entering; Extraction cycle makes evaporator with heat pump 20 cold reduce (the cold process of invalid consumption) for air cooling-down, and increases for cool-down dehumidification process cold, makes the optimal evaporation temperature of heat pump drying and best moisture removal increase; The heat-pump dehumidification increasing extraction cycle is dry than common heat pump drying energy saving more than 30%.
In the present embodiment, as shown in Figure 1, aforementioned recirculation blower includes the first recirculation blower 80 being arranged at heat pump condenser 40 air outlet place and the second recirculation blower 90 arranged in kiln 11, the second recirculation blower 90 is utilized to make the hot blast of whole kiln 11 be uniformly distributed circulation, hot blast is formed in kiln 11 inside and circulates, and each position of mud can realize even drying; Meanwhile, the first recirculation blower 80 makes to be formed between air and kiln 11 indirect heating drying installation in kiln 11 to circulate.
When utilizing aforementioned sludge drying system to carry out sludge drying process, roughly step is as follows for it:
(1) carry out processed by diaphragm filter press to mud, the mud after dehydration loads in kiln 11 through sludge conveyer.
(2) mud after dehydration loads in kiln 11 will stop 15 to 45 minutes, then carries out step (2) heat drying apparatus is started working.
(3) heat drying apparatus is started working, in kiln 11, the air outlet of the wet air self-desiccation room 11 of mud flows out, evaporator with heat pump 20 is entered through the first regenerator 60 heating, the heat that low pressure refrigerant in evaporator with heat pump 20 absorbs wet air becomes gaseous state from liquid state, and wet air forms condensed water because of cooling and discharged by condensate water extraction device 100; Heat pump condenser 40 is delivered to after being boosted by heat pump compressor 30 from the low pressure refrigerant of evaporator with heat pump 20, cold dry air after dehumidification is when the second regenerator 70 flows through heat pump condenser 40, the high-pressure refrigerant of heat pump condenser 40 inside releases heat because of condensation, and cold dry air is then heated to be hot blast, through recirculation blower, hot blast pumping is carried out drying to kiln 11 pairs of mud; The air outlet of the return air drying room 11 after dry complete mud flows out and refluxes to heat through the first regenerator 60 and enters evaporator with heat pump 20 and carry out aforementioned circulation constantly to discharge water of condensation until drying sludge is complete.
In the whole working process of heat drying apparatus, the circulation air path that air flows through is sealing and circulating air channel; Whole system sealing and circulating, without the need to adding other auxiliary heat supplying, the waste gas of sludge drying and wet air mix the cooling cycle system cooling dehumidification of dried machine, the internal recycling being reused for whole dehumidification system is dry, as long as so equipment runs continuously and would not produce unnecessary flue gas and cause atmospheric pollution.
(3) mud after mummification is sent outside kiln 11, obtains dewatered sludge; In the present embodiment, kiln 11 top is provided with sludge-drying delivery port, and dry mud delivery port outside is connected the sludge bin had for storing and drying mud, exports sludge-drying in sludge bin through belt conveyor.
Design focal point of the present utility model is, it is mainly by adopting enclosed removal moisture drying mode and heat pump principle to carry out vapor condensation recovery of heat, drying is carried out without the need to external heat sources such as external interpolation steam, without the need at substantial electric energy, working cost reduces greatly, without waste gas waste heat discharge, noiselessness pollutes, its more energy-saving and environmental protection, safety; And the convenient control of the temperature of drying medium, humidity, not by ectocine, use management is convenient.
The above, it is only preferred embodiment of the present utility model, not technical scope of the present utility model is imposed any restrictions, therefore every above embodiment is done according to technical spirit of the present utility model any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.