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Device for blending combustion of sludge in medium-speed coal mill and method

A coal mill and sludge technology, applied in combustion methods, dehydration/drying/concentrated sludge treatment, combustion types, etc., can solve the problems of large investment and high operation and maintenance costs, and achieve low investment, low operating costs, and savings effect of investment

Pending Publication Date: 2020-06-05
ZHEJIANG ZHENENG TECHN RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used drying methods are high-temperature steam drying and high-temperature flue gas drying. High-temperature steam or flue gas drying requires special drying equipment, which requires large investment and high operation and maintenance costs.

Method used

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  • Device for blending combustion of sludge in medium-speed coal mill and method
  • Device for blending combustion of sludge in medium-speed coal mill and method
  • Device for blending combustion of sludge in medium-speed coal mill and method

Examples

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Effect test

Embodiment

[0040]For a power plant with an installed capacity of 1000MW, when the load of the unit is 1000MW, 5 coal mills are running and 1 is standby. The maximum continuous output of a single coal mill is 80t / h. Due to the mixing of wet sludge, the coal mill Low load stable combustion and coal mill drying output limitation. Make the following assumptions:

[0041] 1) Select a single coal mill to run 60t / h of coal, and mix with 10% of sludge.

[0042] 2) Assuming that the water content of the sludge is 85%, according to the sludge water content-density relationship diagram, the corresponding sludge theoretical density d=1.1017g / ml.

[0043] 3) Select the S pendulum plunger pump produced by a certain company. The maximum conveying capacity is 10m 3 / h. The pumping volume can be adjusted steplessly according to requirements, assuming that the pumping volume is D=6t / h (slightly less than 6m 3 / h)

[0044] 4) The conveying speed is v=0.5m / s.

[0045] According to πr 2 =D÷v÷3600

...

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Abstract

The invention relates to a device for blending combustion of sludge in a medium-speed coal mill. The device comprises a sludge tank, a filter screen, a plunger pump, a coal mill sludge electric isolation valve, the medium-speed coal mill, a coal feeder, a coal feeder outlet electric valve, a coal falling pipe inner sleeve pipe, a related connecting pipeline and a circular sleeve pipe. The device for blending combustion of the sludge in the medium-speed coal mill has the beneficial effects that the core problem that a coal pulverizing system is prone to block due to direct blending combustion of the sludge in the coal pulverizing system is technically solved by combining the structural characteristics of a coal falling pipe on the medium-speed coal mill, the problem of odor overflow in thesludge conveying and drying process is solved, the coal mill is also used as sludge drying equipment, and special sludge drying equipment is not required to be added, so that the investment is saved;and according to a sludge blending combustion method, the original process of a boiler is fully utilized, the waste heat of flue gas and the heat value of the sludge are fully utilized, a heat sourceand equipment for drying the sludge do not need to be additionally arranged, and the method has the advantages of investment saving, high practicability, low operating cost, no secondary pollution andthe like.

Description

technical field [0001] The invention relates to a method for harmless disposal and resource utilization of sludge, and particularly includes a device and method for blending and burning sludge in a medium-speed coal mill. Background technique [0002] Sludge is an unavoidable by-product of wastewater treatment. It usually contains pathogenic microorganisms, parasite eggs, harmful heavy metals and a large amount of refractory substances, etc., which must be effectively disposed of to minimize its impact on the environment. In addition, sludge has a high calorific value and can be used as fuel after drying treatment. The chemical composition of sludge after combustion treatment is similar to that of clay and can be used as building materials. Therefore, reasonable utilization of sludge can turn waste into Treasure, become a resource. [0003] At present, the coupled incineration of coal-fired sludge mainly adopts circulating fluidized bed boilers. This kind of boilers accoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00F23G5/033F23G5/44F23G5/08F23G5/46C02F11/13B02C23/24F23K3/00
CPCF23G7/001F23G5/033F23G5/444F23G5/08F23G5/46C02F11/13B02C23/24F23K3/00F23G2201/80F23G2206/20
Inventor 项群扬吴业成裘立春张海丹杨威黄华俊刘凯锐
Owner ZHEJIANG ZHENENG TECHN RES INST
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