CN1232457C

CN1232457C - Treating method of industrial and domestic sludge

Info

Publication number: CN1232457C
Application number: CNB011031433A
Authority: CN
Inventors: 胡芝娟; 陶从喜; 沈序辉
Original assignee: TIANJIN DESIGN INST OF CEMENT INDUSTRY
Current assignee: Tianjin Cement Industry Design and Research Institute Co Ltd
Priority date: 2001-02-27
Filing date: 2001-02-27
Publication date: 2005-12-21
Anticipated expiration: 2021-02-27
Also published as: CN1370750A

Abstract

The present invention relates to a treating method of industrial and domestic sludge. In the present invention, a baking stirrer, a fluidized suspending furnace and a high efficiency cyclone dust collector are used and placed near a cement clinker burning system. The present invention has the process that fresh sludge with the water content of 75% directly enters the baking stirrer; the sludge from the baking stirrer is loaded into the suspending furnace with a fluidized bed, and certain fuels are replenished in the suspending furnace; the materials from the furnace enter the cement clinker burning system through a cyclone cylinder. In the method, organic components are utilized in terms of heat value when being burnt, bacteria and malodorous gas are thoroughly burnt out, and inorganic components are wrapped in cement clinkers. The present invention has the advantages of simple system, investment saving and no secondary pollution.

Description

Process the method for industry and domestic sludge

Technical field

The invention belongs to a kind of method of Treatment of Sludge, particularly a kind of method of processing industry and domestic sludge.

Background technology

Along with the raising of industrial expansion and people's living standard, environmental protection more and more receives much concern. Mud after a large amount of industry and the sanitary sewage disposal is badly in need of dealing carefully with, and is zero so that its harm to the mankind reduces to minimum. The need that existing mud has take a large amount of soils, and the hidden danger of secondary pollution is arranged; The need that have face the processing problem of a large amount of residues; Thereby the Heavy Metals in Sludge enrichment that easily makes that has produces harm to crops and flowers and plants, and therefore existing Sludge Disposal Techniques all exists shortcoming more or less. Along with the raising of environmental protection requirement, in the urgent need to thoroughly realizing innoxious, the recycling treatment of mud. Therefore invented a kind of mud, utilized cement firing system high temperature, environmentally friendlyization of high heat capacity, recycling sludge, had unique technology, economic advantages, and meet environmental requirement.

Summary of the invention

The purpose of this invention is to provide a kind of processing industry of sewage sludge harmlessness, resource and method of domestic sludge of realizing, to overcome the deficiency of prior art.

The object of the present invention is achieved like this, it includes oven dry mixer, fluidization shower furnace, rotoclone collector, and place near the cement clinker burning system, detailed process is that the fresh sludge with water content 75% directly enters the oven dry mixer, the oven dry thermal source of mixer is from the tertiary air of Cement clinker buring kiln head heat, behind admixture cold wind, enter the gas temperature of oven dry mixer for being about 200 ℃, the mud that goes out to dry mixer is sent into the shower furnace with fluid bed, go out mixer waste gas and enter the further burning of shower furnace fully, postcombustion in shower furnace, approximate head-on collision enters shower furnace from another part tertiary air of Cement clinker buring kiln head heat, furnace bottom is provided with a certain amount of fluidized wind simultaneously, the shower furnace bottom temp is about 1100 ℃, and temperature is about 950 ℃ in the stove, and outlet temperature is about 950 ℃, oxygen content＞6% of coming out of the stove is controlled the gas time of staying＞3 second in shower furnace simultaneously. The material of coming out of the stove directly enters cement clinker burning system after cyclone cylinder is accepted.

This sludge treatment system flow is simple, can directly be arranged in the firing system next door in cement plant, takes full advantage of the existing setting of cement plant firing system. Because the residue after the sludge incineration directly enters in the clinker, alternative cement raw material 10%, after testing cement quality is affected without essence, simultaneously can utilize the thermal source behind the burning sludge to carry out cogeneration according to the actual conditions of factory, Treatment of Sludge can make the cement plant receive decontamination mud and dispose expense, both can save the operating cost of manufacture of cement, reduce mud can reach fully innoxious, the recycling treatment of mud to the harm of environment to greatest extent again. Has preferably Social benefit and economic benefit.

To daily output 1000t/d cement clinker production line, under on the prerequisite of normal production line without impact, can process moisture 75% sludge quantity is 240 tons/day, and can utilize the original dust collecting system of production line fully.

The pluses and minuses of the technology of the present invention and other Sludge Disposal Techniques relatively see Table 1,

The contrast of table 1 mud of the present invention and other mud

Mud	Essential characteristic	Pluses and minuses
Mud	Essential characteristic	Pluses and minuses	Method of disposal of the present invention	The fresh sludge of moisture content 75% directly enters the oven dry mixer, enters the shower furnace suspension calcining behind the oven dry granulating, and waste residue enters cement clinker burning system.	1. calorific value is high after the mud oven dry, is beneficial to burning; 2. shower furnace is simple in structure, and is easy and simple to handle, need not deslagging and processes; 3. the lack of uniformity of fluid bed available buffer mud feeding, and the mud press had certain adaptability;

		4. fuel is lighted in the pure air of high temperature, is conducive to the ignition of fuel.
			Landfill method	Mud is carried out landfill disposal.	1. Sludge landfill needs land occupation, and investment is high; 2. the hidden danger that has secondary pollution.
Composting process	Need add swelling agent with the mud accumulation and as agricultural or flowers and plants with fertilizer	1. but mud as fertilizer sources cost saving. 2. the mud of compost disposal utilizes after through natural air drying and biological decomposition, and its nitrogen, phosphorus, potassium content are starkly lower than fertilizer; 3. compost easily makes the heavy metal accumulation in the mud, and is not thorough to crops and the recovery of flowers and plants generation harmful effect 4. swelling agents, 5 environmental pollutions (gas escapes)	Landfill method	Mud is carried out landfill disposal.
Composting process			The Incineration in CFB method	Mud burns in recirculating fluidized bed, and sludge incineration has the essential characteristic of bubbling fluidized bed.	1. sludge incineration is thorough; 2. need often carry out deslagging and process system complex.

Description of drawings

Fig. 1 system flow schematic diagram of the present invention

Band fluidized-bed shower furnace structural representation among Fig. 2 the present invention

Specific embodiment

As shown in Figure 1, the present invention includes oven dry mixer 3, fluidization shower furnace 4 and efficient cyclone dust-precipitator 7, and placed near the cement clinker burning system, mud 1 has been dried and burning disposal. Detailed process is described below: the fresh sludge 1 of water content 75% directly enters oven dry mixer 3, the oven dry thermal source of mixer 3 is from the tertiary air 2 of Cement clinker buring kiln head heat, behind admixture cold wind, the gas temperature that enters oven dry mixer 3 is 250 ℃, the mud 1 that goes out to dry mixer 3 is sent into the shower furnace 4 with fluid bed, and the waste gas that goes out mixer 3 enters shower furnace 4, and further burning is fully. The mud 1 that replenishes in the stove of shower furnace 4 after coal dust 6 makes oven dry can burn fully therein, another part tertiary air 2 approximate head-on collisions from the Cement clinker buring kiln head heat enter shower furnace 4, to guarantee the wherein abundant active combustion of fuel (comprising mud 1). The furnace bottom of shower furnace 4 is provided with the danger that a certain amount of fluidized wind 5 can overcome mud 1 pressure stove effectively simultaneously. 1100 ℃ of suspension decomposition furnace 4 furnace bottom temperature, temperature is 950 ℃ in the stove, 900 ℃ of outlet temperatures, the oxygen content of coming out of the stove＞6%, gas is 4 seconds time of staying in dore furnace 4. The material of coming out of the stove directly leads to cement clinker burning system 8 after cyclone cylinder 7 is accepted, both can reduce the harm of deslagging, can reduce again the raw material consumption of producing clinker. Accepting/ordering system waste gas can directly carry out cogeneration, also can directly sneak into pre-heating system 8 Combined Treatment of cement clinker burning system.

Fig. 2 is the basic block diagram of fluidization shower furnace 4. The fluidization shower furnace is provided with fluid bed, and most of combustion-supporting hot-air subsides end enters stove 4, the upwards operation of volume seat, and mud 1 is suspension combustion therein, does not have fire grate, does not need deslagging; Cement slurry (main component CaCO₃), entering shower furnace 4, effectively desulfurization does not need to add specially lime stone; Feeding point is on stove 4 tops, and it is first descending that mud 1 enters stove 4, and it is rear up that punching is burned, subtracted in heat exchange. Fluidization shower furnace 4 bottoms arrange special coal-fired combusting device, guarantee to stablize thermal source.

Claims

1. process industry and the method for domestic sludge for one kind, it includes dries mixer, fluidization shower furnace, efficient cyclone dust-precipitator, and places near the cement clinker burning system; Detailed process is that the fresh sludge with water content about 75% directly enters the oven dry mixer, the oven dry thermal source of mixer is from the tertiary air of Cement clinker buring kiln head heat, behind admixture cold wind, the gas temperature that enters the oven dry mixer is about 250 ℃, the mud that goes out to dry mixer is sent into the shower furnace with fluid bed, go out mixer waste gas and enter the further burning of shower furnace fully, postcombustion in shower furnace, approximate head-on collision enters shower furnace from another part tertiary air of Cement clinker buring kiln head heat, furnace bottom is provided with fluidized wind simultaneously, the shower furnace bottom temp is about 1100 ℃, temperature is about 950 ℃ in the stove, and outlet temperature is about 900 ℃, the oxygen content of coming out of the stove＞6%, control simultaneously the gas time of staying＞3 second in dore furnace, the material of coming out of the stove directly enters cement clinker burning system after cyclone cylinder is accepted.