CN1202467A

CN1202467A - Treating process for sewage and excrement

Info

Publication number: CN1202467A
Application number: CN 98110800
Authority: CN
Inventors: 朱平生
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-24
Filing date: 1998-04-24
Publication date: 1998-12-23

Abstract

Sewage and excrement is sprayed by nozzle into drying cylinder, where it is converted in the instantenous drying mode through the direct contact with hot fume produced by incinerating garbage into steam and some volatile gases as well as residual solid grains dropped to the bottom of the cylinder to exhaust. This can utilize the heat of incinerating garbage fully.

Description

Sewage and excrement treatment process

Along with increasing and industrial expansion of urban population, increasing sewage makes many rivers be subjected to severe contamination, deteriorating water quality.The improvement of development of rural economy and life of farmers is also impelling more chemical fertilizer to replace traditional dejection organic fertilizer material gradually.This is on the rise the handling problems of urban night soil.For effectively solving above-mentioned two kinds of source of pollution with low cost, the unnecessary heat that the present invention's proposition utilizes the waste incineration process to produce is handled the novel process of above two kinds of pollutions with spray-dired method.

In the production of food such as drying process with atomizing is used for milk powder for a long time, coffee and some Powdered industrial chemicals.Thereby be subjected to the influence of surrounding gas friction resistance and tear into the surface-area that small-particle has increased liquid particle greatly when fluid overflows through shower nozzle or rotating disk, microgranular drop can instantaneous gasification in high temperature gas flow.The present invention proposes the sewage that shipped by tank car or the ight soil mechanical grille of flowing through earlier and leaves out big particle, flows in the sewage lagoon then.Build a spraying drying tube by laying bricks or stones at incinerator flue rear.With pump with sewage or ight soil in nozzle sprays into drying cylinder, hot flue gas is then introduced around nozzle under the induced draft fan effect, sees Fig. 1. among the figure: the 1-waste pipe; The 2-high-temperature flue gas; The 3-drying cylinder; The 4-small droplet; The 5-low-temperature flue gas.

As long as relevant parameter control is suitable, pending sewage or ight soil will be converted into water vapor and dried particles and some volatile gaseses in instantaneous exsiccant mode according to the spraying drying principle.By outside the worm conveyor expelling tube, can be used or landfill after at the bottom of most of solid particulate drops to tin.Subparticle of overflowing with flue gas and volatile gases then enter in the refining plant in the lump with flue gas and purify.

For effectively removing evaporable obnoxious flavour in the spray-drying process, in purge segment, should be provided with activated carbon adsorption unit, to prevent twice pollution to environment.For solving the high temperature regeneration problem of activated carbon, the high-temperature zone of flue gas planted agent one activated carbon breeding blanket is set, activated carbon heating cylinder is set in high-temperature flue, pending activated carbon is put into tube, the heat that is imported into by barrel slowly heats up activated carbon, adsorbed volatile gases then escapes into and thoroughly burns cinder in the high-temperature flue gas, sees Fig. 2. among the figure: the 1-high-temperature flue gas; The 2-cartridge heater; The 3-activated carbon; The 4-lid; The 5-venting hole; The 6-volatile gases.

The industrial sewage kind is numerous, complicated component, and traditional precipitation, neutralization, methods such as aeration are taken up an area of many, and running expense is also higher, and some high density or the sewage that carries disease germs are also existed certain difficulty on treatment technology.For making full use of a large amount of heats that discharge in the incineration process of domestic garbage, in the incinerator of being everlasting waste heat boiler is set abroad, the heat that utilizes waste incineration to produce makes water vapor, gives user or generating by pipeline again.

This heat energy utilization mode has following shortcoming:

1: the waste heat boiler that is arranged in the incinerator can reduce temperature levels in the stove in heat absorption, thereby influences the firing rate of rubbish;

2: the heat of high-temperature flue gas is earlier with the radiation mode heating pipe, and tube wall heats up the water that contacts with inwall with conduction pattern again and vaporizes.The water vapor that is produced is worn body as the centre of heat and is used further to generating or process pipeline supply user.This Btu utilization mode, it is middle that to transform link a lot, so the effective rate of utilization of heat is not high, the time spent only about tens percent of doing to generate electricity.Very high in the burner hearth without the high-temperature flue gas stream dust content that purifies, when the boiler tubing of flowing through intensive, very easily be attached on the tube wall, this not only makes the difficulty of conducting heat, the difficulty when also having increased operation.

3: equipment is numerous, and factory building is tall and big, and investment is expensive, the Controlling System complexity.

Even statistical information shows factory about 40% (1) only of being furnished with power generation assembly or heating equipment in the incinerator back of industrially developed country.This with above-mentioned be that the existing essence defective of technology mode of heat transfer medium is relevant with water.

The present invention proposes to utilize the heat energy of rubbish to have following all advantages with spray-dired principle:

1: spray-drying process belongs to physical change, and its treatment effect and sewage composition and concentration are all irrelevant, so the reliability of technology height;

2: do not need additional fuel with fume afterheat for sewage or ight soil evaporation time spent, so working cost is extremely low;

3: flue gas and sewage particulate direct contact heat transfer in the spray-drying process, do not need the middle-chain of any heat transfer, so heat transfer rate and efficient are all high, calorific loss is seldom controlled also simple.

4: required equipment is very few, is mainly sewage lagoon, mechanical grille, drying cylinder, no factory building requirement;

5: the fine particle that sewage is sprayed in drying cylinder has the condensation center effect when contacting with micronic dust in the flue gas, makes the dust contained flue gas alligatoring, this and improved the dust removing effects of back dust-removal system;

6: the sewage evaporative process also is the temperature-fall period of flue gas simultaneously, and it can greatly alleviate follow-up flue gas cool-down workload when flue gas adopts wet purification;

7: the art breading ight soil liquid with evaporation drying can reach sterilization, subtracts appearance, all purposes of deodorizing.Solid particulate after the dehydration is keeping whole fertilizer efficiency of original ight soil as a kind of spissated organic fertilizer, is fabulous farmland fertilizer, and very high commodity value is arranged, and its economic gain can reduce system operation cost significantly.

8: handling sewage or ight soil about the 50-70% of suitable approximately rubbish weight simultaneously with lower cost when fume afterheat that the present invention carries utilizes method can make waste incineration stand in treating refuse, thereby enlarging the economic benefit and the social benefit of burning the station significantly.

The method of utilizing rich heat in the waste incineration process of the present invention in sum is in investment cost, running cost, and processing capacity, operating method, social benefit, the garbage incineration process that each side such as economic target are all more traditional has more obvious advantage.

(1). " castoff burning and energy recovery ", " Shanghai environmental health design and research institute " establishment, Zhang Wei etc. translate, P.1:640 383 band heat reclaim units in the platform incinerator.

Claims

1. sewage or excrement are sprayed in the flue gas behind the incinerator with the fine drop form make it evaporation drying.

2. in the incinerator high-temperature flue, cartridge heater is set, places in the tube and treat the regenerated activated carbon, utilize flue gas heat that activated carbon is heated up, thereby adsorbed waste gas is overflowed and after-flame in high-temperature flue gas.