CN1978348A - City sludge comprehensive utilization - Google Patents

Abstract

This invention discloses a method for using city sludge in combination composed of 1, a sludge drying unit, 2, a burning and processing unit, 3, a smoke process unit, 4, a turbine-generator set generation unit, 5, a waste gas collection and process unit, 6, a producing unit for construction materials, which mainly utilizes the steam exhaust generated by the steam turbine set and waste steam generated when drying sludge.

Description

The comprehensive utilization of municipal sludge

Technical field

The invention belongs to the municipal sludge process field, specially refer to a kind of method of processing of high environmental protection, resource utilization, the minimizing of municipal sludge.

Background technology

Urbanization process is more and more come soon in recent years, and the generation of city domestic sewage and processing rate are also more and more come high, although taked the whole bag of tricks, cut down the quantum of output of municipal sludge, and total amount is still increasing progressively rapidly.Mud is a kind of heterogeneous body of being made up of organic relic, bacterial body, inorganic particle and colloid etc.It is difficult to carry out solid-liquid separation completely by sedimentation.The biological treatment mud that mixing sludge that sanitary sewage disposal produces and trade effluent produce is typical organic sludge, and its characteristic is organic content height (60%～80%), particle thin (0.02～0.2mm), the little (1002～1006kg/m of density ³), be colloidal structure, be a kind of wetting ability mud, easy pipe-line transportation, but dewatering is poor.The rheology state of mud depends on the size of its moisture, and is relevant with the characteristic (particle shape and viscosity degree thereof) of particle phase concentration, urbanization degree and mud granule thing.Along with the minimizing of sludge water content, mud changes up to this process of pure solid state from the pure aqueous viscous, plasticity proterties, half-dried solid state of flowing to.Usually concentrate and water ratio can be dropped to 85% (saturation state); Water ratio was at 70%～75% o'clock, and mud is soft condition, was difficult for flowing; Usually general dehydration drops to 60%～65% only, at this moment, almost becomes solid; Water ratio is low by 35%～40% o'clock, becomes the poly-state that looses (more than be half-driedization state); Further low powdered to 10%～15%.The nuisance that contains in the mud if long-term stacking does not add disposal, can cause huge harm to the environment and the mankind simultaneously, and the organism that contains in the mud and ammonia, nitrogen etc. cause the deterioration of water quality with the oxygen in the mass consumption water body simultaneously.Simple stacking not only takies a large amount of soils.

China is a country of scarcity of resources per capita, and mud is regarded as the resource that mislays, and mud produces everyday, is a kind of inexhaustible renewable resource, and from utilization of resources angle, mud carries out innoxious, recycling, is even more important.Mud being carried out burning electricity generation, on the one hand, utilize the generating of mud inherent calorific value, is a kind of measure of turning waste into wealth, economizing on resources; On the other hand, reduced the landfill of mud, not only saved land resources, and reduced the mud landfill and produce and to ooze the pollution of draining, protected precious water resource underground water and surface water.

Summary of the invention

The object of the present invention is to provide a kind of high environmental protection, a kind of cheaply municipal sludge incineration treatment method reaches the purpose that municipal sludge is handled minimizing, innoxious, resource utilization.

The method of proposition of the present invention may further comprise the steps:

One. with indirect type steam sludge drying mechanism with water ratio at the drying sludge of 80%-90% to about the 20%-50%.

1) exhaust steam of Jia Re thermal source after from steam turbine power generation.

2) contained water becomes the water vapor discharge in the mud,, effluxes after the condensed water processing is qualified once more as the thermal source of mud preheating by the waste vapour collection device.Incoagulable gas is delivered in the incinerator and is handled through the high temperature incineration more than 850 ℃.

Two. the mud about moisture 20%-50% is sent in the circulating fluidized bed sludge incinerator and is burned, because of sludge calorific value about the 2000-3000 kilocalorie so to add a spot of coal combustion-supporting.

1) flue gas that produces during boiler combustion effluxes by chimney through desulfurization, sack cleaner dust removal process.

2) flying dust collected of slag that produces during boiler combustion and sack cleaner is done building materials.

Three. the steam that boiler produces is sent into the turbine driven set generating.

1) electricity of turbine driven set generation is sent into electrical network.

2) the waste heat drying sludge thermal source after the turbine driven set generating.

Description of drawings

Fig. 1 is the process flow diagram of the inventive method.

The treatment process combined process schematic flow sheet and the embodiment of the municipal sludge that specific embodiment the present invention proposes further specify.

The processing unit that the inventive method adopts can be divided into five processing units: 1, drying sludge unit 2, sludge incineration processing unit 3, incinerator smoke processing unit 4, turbine driven set generator unit 5, waste vapour collection and treatment unit, 6, the building materials productive unit forms.

As shown in Figure 1: each unitary equipment and technological process are respectively described below: with indirect type steam sludge drying mechanism 1 with water ratio at the drying sludge of 80%-90% to about the 20%-50%.Steam is passed to heat and is sent boiler back to after condensing into water behind the mud, and when mud becomes water vapor and discharges because of being heated contained water, the waste vapour of being discharged is collected once more by collection device and utilized, and water of condensation is handled and effluxed after qualified.Incoagulable gas is delivered in the incinerator and is handled through 850 ℃ of high temperature incinerations.Mud about moisture 20%-50% is sent into circulating fluidized bed incinerator 2, because of sludge calorific value about the 2000-3000 kilocalorie so to add a spot of coal combustion-supporting, burning disposal under the high temperature of 850 ℃ of circulating fluidized bed sludge incinerators.The steam of the High Temperature High Pressure that boiler produces is sent into turbine driven set generating 4.Waste heat drying sludge thermal source after the turbine driven set generating.The flue gas that produces during boiler combustion effluxes by chimney through desulfurization, sack cleaner fly-ash separator 3.The flying dust that slag that produces during boiler combustion and sack cleaner are collected is done building materials 6.

The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.

Claims (3)

1. A kind of method of comprehensive utilization of mud is characterized in that:

   1). system by form 1 with a next part unit, drying sludge unit 2, sludge incineration processing unit 3, incinerator smoke processing unit 4, turbine driven set generator unit 5, waste vapour collection and treatment unit, 6, the building materials productive unit.
2. 2). mud adopts the surplus vapour behind the steam turbine power generation to be used as the thermal source of sludge-drying.
3. 3). mud is burning in the high temperature sludge incinerator more than 850 ℃ between the 20%-50% being dried to water ratio.