System and process for drying sludge using pulse combustion internal heating fluid bed

A fluidized bed drying and fluidized bed dryer technology, applied in dewatering/drying/concentrating sludge treatment, chemical instruments and methods, dispersed particle separation, etc., can solve the problem of long drying time, large energy consumption, and large heat loss and other problems, to achieve the effect of no dust combustion and explosion hazards, improved drying efficiency, and low environmental protection pressure

Active Publication Date: 2012-09-26
SHANDONG TIANLI DRYING TECH & EQUIP
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AI-Extracted Technical Summary

Problems solved by technology

Its advantages are simple process flow, large single-machine processing capacity, and easy industrialization. The disadvantages are that the production equipment is huge, covers a large area, and takes a long time to dry. Large, the whole drying process is less economical
Its advantages are high drying efficiency, no danger of explosion and fire, small tail gas emissions, low operating costs, and good economics in the entire drying process. The disadvantages are...
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Abstract

The invention discloses a system for drying sludge using a pulse combustion internal heating fluid bed. The system comprises a pulse combustor, a wet sludge feeding granulating device, an internal heating fluid bed drier, a dust removing device and a deodorizing device. The invention also discloses a corresponding process for drying the sludge using the pulse combustion internal heating fluid bed. According to the invention, the process that the pulse combustion is combined with the heating fluid bed is adopted for sludge drying, so that the drying intensity is improved, the energy consumption is reduced, the treatment quantity of waste gas is reduced, and meanwhile the oxygen content of the system is reduced; dust combustion and explosion danger are prevented; and the system and the process are safe and reliable.

Application Domain

Technology Topic

Exhaust gasPulse combustion +7

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  • System and process for drying sludge using pulse combustion internal heating fluid bed
  • System and process for drying sludge using pulse combustion internal heating fluid bed

Examples

  • Experimental program(1)

Example Embodiment

[0036] The present invention will be further described below in conjunction with the drawings and embodiments.
[0037] figure 1 In, a pulsating combustion internally heated fluidized bed drying system for sludge, the exhaust pipe of the pulsating burner 3 is connected to the air inlet of the internally heated fluidized bed dryer 4, and the internally heated fluidized bed dryer 4 is connected to the wet sludge. The material granulation device and the cyclone dust collector 5 are connected separately; steam (superheated steam or saturated steam) enters the internal heat exchanger and the wet sludge after heat exchange through the steam inlet of the heat exchanger in the internal heating fluidized bed dryer 4 Return to the boiler; the air outlet of the internally heated fluidized bed dryer 4 is connected to the cyclone 5 and the electric precipitator 6 in sequence, and the exhaust gas after dust removal is mixed with the exhaust gas of the pulse burner 3 through the circulating fan 8 and sent back to the internally heated fluidized bed Part of the dryer 4 is used as the secondary air of the pulsation burner 3 to return to the system, and the other part is discharged from the system through the spray tower 9.
[0038] The wet sludge feeding and granulating device includes a sludge silo 1, a sludge pump 2, a sludge pipe 7, and a sludge crusher. The sludge silo 1 is connected to the sludge pump 2 and connected to the sludge crusher through the sludge pipe 7. The sludge crusher is installed on the wet sludge inlet of the internally heated fluidized bed dryer 4.
[0039] The specific implementation steps of the present invention are as follows:
[0040] (1) The sludge with 70% to 90% water content is sent by the sludge pump through the sludge pipe to the crusher at the wet sludge inlet of the internally heated fluidized bed dryer, and the crushed sludge falls into the bed;
[0041] (2) The exhaust gas of the pulsation burner enters the inner heating fluidized bed from the upper air inlet of the inner heating fluidized bed dryer, which is used to disperse the sludge and enhance heat transfer, and quickly dry the sludge to a moisture content below 50%. Carrying water vapor; the pre-dried powdery granular sludge in the internal heating fluidized bed dryer is continuously heated and dried by the heat provided by the steam (superheated steam or saturated steam) in the internal heat exchanger, by controlling the sludge in the bed The residence time is dried to the required moisture; all the condensed water from the heat exchanger in the internal heating fluidized bed dryer is returned to the boiler for reuse; 30%-50% of the heat required to dry the wet sludge is provided by the pulse burner, The remaining heat is provided by steam (superheated steam or saturated steam); the exhaust gas temperature of the pulsation burner is between 500-700°C, the pulsation frequency is 80-120 Hz, and the average airflow range is 15-20m/s. The pressure of the steam (superheated steam or saturated steam) is 0.3-0.6 MPa, and the condensed water is returned to the boiler after heat exchange with the wet sludge.
[0042] (3) The dried sludge is discharged from the discharge port of the internally heated fluidized bed dryer and transported to the dry silo together with the dry powder collected by the cyclone dust collector; the temperature of the dried sludge is 100-120°C.
[0043] (4) The moisture and part of dry sludge precipitated by drying are carried by the hot flue gas in the bed, after passing through the secondary dust removal device, 50~70% is mixed with the exhaust gas of the pulse burner and sent back to the internal heating fluidized bed dryer. ~20% is used as the secondary air return system of the pulse burner, and the remainder is discharged from the system through the deodorizing device; the temperature of the flue gas after the dust removal is 150-200°C.
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