Co-combustion device and method capable of automatically adjusting blending combustion amount of sludge

Abstract

The invention discloses a co-combustion device capable of automatically adjusting blending combustion amount of sludge. The co-combustion device comprises a mechanical grate furnace, a sludge feedingdevice, a stirring device, a control system and a water vapor sensor. The sludge feeding device, the stirring device and the water vapor sensor are separately connected with the control system, and the mechanical grate furnace is further provided with a temperature sensor. The control system provides power for the sludge feeding device and the stirring device, the water vapor sensor and the temperature sensor acquire water vapor volume fraction at the position of an outlet of a flue and a furnace box temperature to match the sludge feeding speed with the furnace box temperature, the furnace box temperature is controlled between 800 DEG C and 950 DEG C, meanwhile, by control over the stirring device, garbage and a sludge mixture are mixed fully, and combustion is stable. The invention further discloses a co-combustion method of the co-combustion device based on automatic adjustment of the blending combustion amount of the sludge. The blending proportion is proper, fuels are fully and stably combusted, and the equipment runs stably and is long in service life.

Description

Technical field [0001] The invention relates to the technical field of garbage incinerators, in particular to a mixed burning device and method for automatically adjusting the amount of mixed burning of sludge. Background technique [0002] With the rapid development of China's economy, the amount of urban waste generated has been increasing, and waste incineration technology has received increasing attention and attention as the main means to realize the recycling, reduction and harmless treatment of municipal solid waste. At present, the incoming waste heat value of a large number of operating units has exceeded the original design incoming heat value of waste incinerators. In addition, the calorific value of municipal solid waste is unstable and has typical seasonal distribution characteristics. At the same time, the calorific value of municipal solid waste varies greatly in different regions. At present, the existing waste and sludge blending incinerators generally send the ...

AI Technical Summary

Problems solved by technology

Moreover, the calorific value of municipal solid waste is unstable and has typical seasonal distribution characteristics. At the same time, the calorific value of domestic waste in different regions varies greatly

At present, the existing garbage sludge blending incinerators generally send the sludge into the combustion pool alone, or use a screw conveyor to send the sludge into the garbage hopper. The mixing ratio of domestic garbage and sludge is generally based on Design conditions and operating experience are set, often resulting in a mismatch between the amount of sludge mixed with the calorific value of waste

If the amount of sludge blending is too low and the calorific value is too high, the fuel will burn out early, and the grate surface will be exposed, which will cause serious high-temperature corrosion to the furnace, which is not conducive to the safe operation of the equipment, and will also increase the heat loss of the exhaust gas. If the blending amount is too high and the main combustion temperature is too low, not only is it not conducive to the complete combustion of garbage sludge, but the furnace temperature is too low may also lead to excessive dioxin emissions, increased fuel injection, and increased equipment operating costs

Moreover, the mixing of domestic waste and sludge only depends on the simple mixing of the screw feeder, which will lead to incomplete, insufficient and uneven mixing of the two, which is not conducive to the stable combustion of the waste incinerator

[0003] To sum up, the mismatch between the amount of sludge mixed with the calorific value of waste will have a negative impact on the safe and stable operation of the incinerator, and will also affect the power generation efficiency of the waste sludge blended combustion power plant

Only relying on the reference blending ratio under the initial design conditions and manual adjustments by operators based on experience, it has been difficult to determine the optimal blending ratio for sludge and garbage blending and combustion under the new situation, which seriously affects the ultra-clean emissions and equipment of the incinerator Efficient, safe and stable operation

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