CN1261060A

CN1261060A - Process and equipment for treating diluted waste alcohol liquid by spray concentrating and burning

Info

Publication number: CN1261060A
Application number: CN99123078A
Authority: CN
Inventors: 黄华
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-04-23
Filing date: 1999-11-18
Publication date: 2000-07-26

Abstract

A process and equipment for treating diluted waste alcohol liquid from alcohol distillation tower features that said diluted waste alcohol liquid is contacted with hot fume in multi-stage spray evaporator at outlet of combustion furnace for concentrating and drying it and the concentrated liquid is directly sprayed in the furnace or mixed with coal, cane dregs and filter mud for loading it in furnace. The hot fume is dusted, its heat is recovered and finally it is discharged from chimney. Its advantages are simple equipment, full use of heat energy and eliminating environmental pollution.

Description

The spraying condensed combustion is handled the method and apparatus of diluted waste alcohol liquid

The present invention relates to the treatment process and the equipment of a kind of processing of high-concentration industrial sewage, particularly alcohol slops.

Molasses alcohol waste liquid is through fermentation, the useless mash that fermented liquid discharges after distillation tower distills out alcohol with sugar refinery saccharified residues molasses.Its quantity discharged is big, be equivalent to more than 13 times of alcohol output, it is the most serious blowdown source of sugar industry, its chemical oxygen demand (COD) reaches more than 100,000 mg/L, biochemical oxygen demand (BOD) is more than 3000PPM, and color is dark, the acidity height, smelly easily, an alcohol slops of producing 20 tons alcohol factory discharge daily is equivalent to one 500,000 population city domestic sewage degree of discharge, at present China also has nearly half unprocessed or treated slightly promptly discharging in the environment of alcohol slops to sugar refinery of 1/3, has caused great pollution hazard.This vital interests problem that influences the living of the people round environment protection, the technician of sugar refinery, grain distillery and many efforts at environmental protection persons try one's best always in recent years, and it is low to seek a kind of cost, effective method for treating alcohol discharge liquid.

The processing of alcohol slops has oxosugar method, method of enrichment, combustion method, mixing towards grey method, but these methods problems such as lifetime is long respectively, energy consumption is high, occupation of land is many, investment is big, that really can promote at present is few.The applicant has applied for " alcohol slops New Method for Processing and equipment " (99104578.5) in April, 1999 to Patent Office of the People's Republic of China, it is that rare waste liquid that the alcohol distillation tower is discharged is fed atomisation in the spray evaporator that is integrated with special roasting kiln through post precipitation slightly, in high-temperature flue gas the burning or concentrate, powder, flue gas is discharged from chimney after dedusting again.This method and apparatus has solved the shortcoming that conventional art can not once directly not handled rare waste liquid, have take up an area of few, reduced investment, simple to operate, reach the intact effect of alcohol slops base conditioning, can't make full use of fully but shortcoming is a calorific value in the alcohol slops.

The purpose of this invention is to provide a kind ofly handle that alcohol slops is effective, equipment is simple, the sufficient method of heat energy utilization and realize the equipment of this method.

The present invention realizes like this, the concentration of discharging from the alcohol distillation tower is that the hot Diluted Alcohol waste liquid of 10-12 ° of BX is (because alcohol just distills, the waste liquid temperature of discharging is about about 70-90 ℃), spray in the special 2-4 level spray evaporator of the hot exhanst gas outlet of roasting kiln, fully contact with hot flue gas, alcohol slops is condensed to the concentrated solution of 50-80 ° of BX or is dried to powder, again this is condensed into the concentrated solution of 50-80 ° of BX or is dried to powder, again with this concentrated solution with spray in the roasting kiln with by the fuel such as bagasse or the fine coal that replenish, sugarcane filter muds etc. burn together, the hot flue gas that burning is produced resupplies 2-4 level vaporizer, thin liquid is carried out evaporation concentration, so circulation, tail gas leads to chimney by induced draft fan at last through fly-ash separator with by preboiler recovery part heat energy.

Realize that equipment of the present invention comprises roasting kiln, spray evaporator, fly-ash separator, induced draft fan and chimney, be characterized in that spray evaporator is the 2-4 level, it is several capacitance dividers independently or several spray chambers of being integrated with roasting kiln, independently spray evaporator is right cylinder or spheroid container, each container is provided with the smoke entrance pipe, inside is equipped with one group to several groups of shower nozzles, hot flue gas contacts with the alcohol slops adverse current or the following current of atomisation in container, moisture content is gasified, and container bottom all obtains concentrated solution or dry powder is discharged; The spray evaporator that is integrated with roasting kiln is to utilize the exhaust gases passes of roasting kiln to make, be that first step spray evaporator is close to burner hearth, the middle block has firebreak one, and exhanst gas outlet is arranged at the top, and paste mutually with the first step second stage, there is dividing plate the centre, the flue gas mouth is arranged at the bottom, and the back one-level is pasted mutually with previous stage later on, and exhanst gas outlet is arranged at the top, in burner hearth top and the vaporizer at different levels shower nozzle is housed all, shower nozzle can be single fluid shower nozzle or air one liquid two-fluid shower nozzle.The outlet of discharging concentrated solution or dry powder is all arranged at the spray evaporator bottom of two kinds of forms, and this outlet can pick out the shower nozzle that pipeline leads to the burner hearth top.

For reclaiming heat, after spray evaporation, can connect fly-ash separator, also can connect waste heat boiler, waste heat boiler is tubular heat exchange or spiral heat exchanger, and its effect is that temperature is also made full use of than higher hot flue gas again, produces water vapor or hot water, use for producing, to discharge the few flue dust of chimney breast in order making, after spray evaporator, to be provided with dry collector, be provided with wet scrubber before the induced draft fan.

The treatment process and the equipment of alcohol slops of the present invention are described below in conjunction with accompanying drawing:

Fig. 1 is that spray evaporator is the technical process and the device structure sketch of the spraying condensed combustion processing diluted waste alcohol liquid of independent capacitance divider;

Fig. 2 is technical process and the device structure sketch that the spraying condensed combustion that is integrated of spray evaporator and roasting kiln is handled diluted waste alcohol liquid.

From Fig. 1, see, from the exhanst gas outlet on roasting kiln 2 tops through three

spherical spray evaporators

3,4 and 5, hot rare waste liquid of sending here from storage tank 1 leads in the spherical vaporizer with making it under shower nozzle 11 sprays to contact with hot flue gas and is condensed into dope, temperature height or spouting liquid can powder after a little while, the flue gas that has absorbed water vapor continues to lead to dry collector 6 and arrives waste heat boiler again, exchange out heat, remove dust, cause chimney by induced draft fan 9 at last and discharge atmosphere with wet scrubber 8.

From Fig. 2, see, vaporizer and roasting kiln 2 are integrated, spray evaporator utilizes the exhaust gases passes of roasting kiln to make, be provided with heat reflection plate 13 and temperature probe 12 in the roasting kiln 2, first step exhaust gases passes is spraying concentration and evaporation chamber 3, between it and the roasting kiln burner hearth 14 firewall is arranged, exhanst gas outlet is at the top, second stage exhaust gases passes is spraying concentration and evaporation chamber 4, between it and the evaporator room 3 dividing plate is arranged, and flue gas enters from the bottom of evaporator room 3; Again from evaporator room 4 top pass-outs toward fly-ash separator 8, lead to the shower nozzle 11 that is contained in roasting kiln 2 and vaporizer 3 and vaporizer 4 with pipeline and valve 15 from the diluted waste alcohol liquid of the next heat of alcohol distillation tower respectively in the bottom of storage tank 1, spouting liquid in the roasting kiln 2 is less, mainly be to make liquid ejection burning, and the spouting liquid in vaporizer 3 and the vaporizer 4 is more, when the thin liquid amount of ejection is big, what discharged the bottom is concentrated solution, discharge rate then may powder on a small quantity, concentrated solution of discharging or powder can with fire coal, fuel mix such as bagasse are put into and are burnt in the roasting kiln, and the flue gas that exports from fly-ash separator 8 also is sent to chimney 9 behind induced draft fan 9.

The mode of connection of equipment is that the hot flue gas behind the roasting kiln leads to 2-4 level spray evaporator, on the shower nozzle of diluted waste alcohol liquid through receiving every grade of spray evaporator behind the waste water storage tank, the outlet of last step spray evaporator connects dry collector (available tornado dust collector), connect waste heat boiler behind the dry collector, waste heat boiler can connect wet scrubber (for example using water dust scrubber), receive induced draft fan behind the wet scrubber, lead to chimney at last.The dense waste liquid of discharging from the spray evaporator bottom leads to the roasting kiln burning.

Processing condition of the present invention are that alcohol thin liquid concentration is 10～12 ° of BX.Answer 〉=50 ° of BX from the dense waste liquid of spray evaporator bottom, the first step may be 20-50 ° of BX, what may command concentration of back is at 50 °-80 ° more than the BX, furnace temperature is 800-1200 ℃, the waste heat boiler input gas temperature is below 180 ℃, outlet is below 120 ℃, wet scrubber outlet induced draft fan input gas temperature≤80 ℃.

The present invention compared with prior art, outstanding substantive distinguishing features and significant progress are:

1. diluted waste alcohol liquid no longer needs evaporator in advance to concentrate, and has greatly saved the steam energy consumption, and concentration is 10-12 ° of BX The spray concentration burning of rare waste liquid one step reduced equipment, the cost of complete equipment just concentrates earlier 1/ of equipment for after-treatment 2, be fit to middle-size and small-size sugar refinery and Alcohol Plant to the processing of waste liquid.

2. the Slops treatment cost is low, and is effective, can utilize bagasse or filter mud and the concentrated alcohol in colm or sugar refinery Waste liquid is made fuel, has so both processed pollution sources, and operating cost is reduced greatly.

3. simple to operate, because simplified equipment, so power, the energy greatly reduce, operating personnel also greatly reduce, and improve enterprise Industry working efficiency and economic benefit.

4. complete equipment is autonomous system, and boiler, flue, the steam to sugar refinery ordinary production does not produce any impact, does not need volume Outer steam, additional waste heat boiler also make used heat heat energy obtain utilizing.

5. realized that alcohol slops does not have discharging, protected environment, solved the waste liquor contamination difficult problem that grain distillery is perplexed for a long time.

Claims

1. the condensed combustion of spraying is handled the method for alcohol slops, comprise with hot flue gases and contacting with the alcohol slops of atomisation, the dedusting of flue gas and discharging, it is characterized in that: the concentration of discharging from the alcohol distillation tower is that the hot Diluted Alcohol waste liquid of 10-12 ° of BX sprays into the special 2-4 level spray evaporator of the hot exhanst gas outlet of roasting kiln, fully contact with hot flue gas, with the alcohol slops concentrate drying is concentrated solution or the dry powder of 50-80 ° of BX, concentrated solution spray into the roasting kiln internal combustion or with fire coal, bagasse mixes puts into the roasting kiln burning, hot flue gas reclaims heat through dedusting or through waste heat boiler, leads to chimney by induced draft fan.

2. spraying condensed combustion according to claim 1 is handled the method for alcohol slops, it is characterized in that: the concentration of first second stage spray evaporator bottom control is 20-50 ° of BX concentrated solution or powder, concentration 50-80 ° of BX of what spray evaporator bottom control of back, the waste heat boiler input gas temperature is below 180 ℃, outlet is below 120 ℃, induced draft fan input gas temperature≤80 ℃.

3. a spraying condensed combustion as claimed in claim 1 is handled the equipment that the alcohol slops method adopts, comprise roasting kiln, spray evaporator, fly-ash separator, induced draft fan and chimney, it is characterized in that: spray evaporator is the 2-4 level, it is several capacitance dividers independently or several spray chambers of being integrated with roasting kiln, each spray evaporator is provided with smoke entrance, inside is equipped with one group to several groups of shower nozzles, the Diluted Alcohol waste liquid is connected to the shower nozzle ejection and contacts with hot flue gas, base of evaporator has concentrated solution or dry powder relief outlet, the roasting kiln outlet connects spray evaporator, the spray evaporator outlet connects fly-ash separator or waste heat boiler, is picked out to chimney by induced draft fan then.

4. spraying condensed combustion according to claim 3 is handled the equipment of Diluted Alcohol waste liquid, and the spray evaporator that it is characterized in that independent capacitance divider is right cylinder or spheroid container, and each container is provided with smoke entrance, and shower nozzle is housed in the container.

5. spraying condensed combustion according to claim 3 is handled the equipment of Diluted Alcohol waste liquid, the first step spray evaporator that it is characterized in that the spray evaporator that is integrated with roasting kiln is close to burner hearth, the middle block has firebreak one, exhanst gas outlet is arranged at the top, and back one-level and previous stage are close to, and there is dividing plate the centre, the flue gas mouth is arranged at the bottom, shower nozzle is housed in the spray evaporator, and the outlet of discharging concentrated solution or dry powder is arranged at the bottom, and concentrated solution also can be connected to the shower nozzle of roasting kiln burner hearth top by pipeline.