CN1058687C

CN1058687C - Process and installation for treating ramie boiled-off waste water by use of flue gas

Info

Publication number: CN1058687C
Application number: CN 93106661
Authority: CN
Inventors: 廖业桂
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-31
Filing date: 1993-05-31
Publication date: 2000-11-22
Anticipated expiration: 2013-05-31
Also published as: CN1079448A

Abstract

The present invention provides a technology and a device for using boiler flue gas to process ramie degumming boiling waste water. The degumming boiling waste water is transferred to a water bath impact type neutralizer by a pump for spraying and thoroughly contacting smoke. The gas of SO2, CO2, and H2S in the smoke are neutralized and absorbed by alkaline matters in the waste water. Thus, harmful gas elements in the smoke and the alkalinity of the waste water are reduced. The technology and the device have the advantages of low processing cost and convenient operation. The processed waste gas and the processed waste water achieve a discharge standard of national environmental protection.

Description

Equipment with the flue gas treatment ramie boiled-off waste water

The present invention relates to a kind of equipment with boiler flue gas disposal ramie-degumming waste water.

Boiler flue and ramie-degumming waste water all are the pollutents of environment of working the mischief, and stack gas mainly contains flue dust and CO ₂, SO ₂, H ₂Obnoxious flavoures such as S normally adopt fly-ash separator to add basic solution and handle; And ramie-degumming waste water alkalescence is big, colourity is dark, contain large amount of organic, common treatment process is to add acid neutralization, and then carries out a biological disposal upon, and is the cost height by the shortcoming of above-mentioned treatment process, be difficult for operational administrative, China present many ramie textile factory, the annual fund of only handling degumming waste water accounts for more than 10% of the gross output value, so just greatly reduces the economic benefit of factory.

The purpose of this invention is to provide a kind of employing boiler flue gas disposal ramie boiled-off waste water equipment, it only needs to use a set of equipment just to solve the soot dust granule that can remove in the flue gas, again can in and CO in the flue gas ₂, SO ₂, H ₂Compositions such as S, and in can also be simultaneously and ramie-degumming waste water pH value, removal COD have reduced facility investment and water consumption, has made things convenient for operation.

Device structure of the present invention and principle of work are as follows:

After ramie boiled-off waste water is discharged from saucepan, flow to waste liquid pool, be cooled to normal temperature, then with pump delivery to visual plant of the present invention---the top of water-bath impact type neutralizer is sprayed and descend, and the rough dusting stack gas of sending here bottom neutralizer fully contacts.CO soluble in water, SO ₂, H ₂NaOH in gas such as S and the waste water produces chemical reaction, and the pH in the waste water is worth to reduce, and meanwhile, the dust in the flue gas is removed, CO ₂, SO ₂, H ₂NaOH in gas such as S and the waste water produces chemical reaction, and the pH in the waste water is worth to reduce, and meanwhile, the dust in the flue gas is removed, CO ₂, SO ₂, H ₂Gas contents such as S reduce greatly, then by smoke stack emission to atmosphere, degumming waste water flows out from neutralizer bottom, enters active settling tank, after the adsorption precipitation, carries out a biological disposal upon again.

Key equipment of the present invention---neutralizer is built into numb stone (grouan).There is spray chamber its inside, reaction absorption chamber, kiln, several shower nozzles are equipped with at the spray chamber top, ramie-degumming waste water sprays and descends from the shower nozzle at spray chamber top, the spray chamber bottom is equipped with orifice plate for the reaction absorption chamber between two Room, flue pipe is below the liquid level of reaction absorption chamber, spray chamber top has the pneumatic outlet passage to communicate with kiln, and kiln leads to the induced draft fan inlet again by the chimney emptying with pipeline.

Below in conjunction with accompanying drawing principle of work of the present invention and structure are described:

Fig. 1 is a process flow sheet of the present invention;

Fig. 2 is a water-bath impact type neutralizer equipment structure chart.

See that from Fig. 1 ramie boiled-off waste water is discharged from saucepan, storage enters waste liquid pool, behind the cool to room temperature, be delivered to water bath impact type averager top with corrosion protection pump, spray and descend, the boiler flue that enters with the averager bottom fully contacts CO soluble in water₂、SO ₂、H ₂NaOH in S gas and the waste water produces chemical reaction, basicity in the waste water is descended, meanwhile, out be transported to chimney by air-introduced machine is discharged into atmosphere to flue gas afterwards from averager, processing water flows out from the averager bottom, enter active sedimentation basin and process, carry out again at last biodegradation (processing such as oxidation pond).

Fig. 2 describes out the cut-away view of water bath impact type averager; Wherein (1) is shower nozzle, and (2) are spray chamber, and (3) are flue gas inlet tube, and (4) are orifice plate, and (5) are the reactive absorption chamber, and (6) are delivery port, and (7) are hothouse, and (8) are smoke outlet tube. This averager can be made with plastics or the nonmetallic materials of numb stone (granite), acid and alkali-resistance high temperature, the spray chamber upper top is established several shower nozzles (2), and waste water sprays from shower nozzle, falls into orifice plate (4), enter reactive absorption chamber (5), but overflow and going out after full. Boiler smoke enters reactive absorption chamber (5) from flue gas inlet tube, contact with solution (bath is washed), then emerge from orifice plate (4), again contact with the fresh degumming waste water that sprays, remove remaining sour gas composition, enter again hothouse and remove foam, then through air-introduced machine, to be delivered to chimney emptying.

CO in the flue gas₂、SO ₂、H ₂Alkaline matter in S and the ramie boiled-off waste water (NaOH) reaction is as follows:

Before ramie boiled-off waste water entered neutralizer, pH value was 10-12, and COD concentration is 8000-9000 (mg/l), SO in the flue gas ₂Be about 1868 (mg/l), (because of the different SO of coal ₂Also different), after neutralizer was handled, pH value was reduced to 7-8.5 in the solution, and COD reduces to 4000-5000 (mgle), SO ₂Gas is reduced to 172 (mg/l).

Below be embodiments of the invention:

Peaceful and comfortable jute mill, Guangxi will begin neutralizer device processes degumming waste water of the present invention on probation from the end of the year 1991, and its operation result is as follows:

Table 1 boiler flue treating ramie boiled-off waste water operation result:

Device name	Sample number into spectrum	PH value COD (mg/l)
		PH value COD (mg/l)					Import	Outlet	Import	Outlet	％
		Neutralizer	1#	11.9	8.0	8040	Import	Outlet	Import	Outlet	％	4300	46.52
2#	11.87		1#	11.9	8.0	8040	8.0	9040	5200	42.50		4300	46.52
2#	11.87		3#	11.2	7.0	8600	8.0	9040	5200	42.50	4500	47.70
4#	11.3		3#	11.2	7.0	8600	8.5	8000	4250	46.90	4500	47.70
4#	11.3		5#	11.4	7.5	8400	8.5	8000	4250	46.90	4600	54.70

The outlet of table 1 explanation solution pH value is near neutral, and the COD clearance is about 50%.

Then result supervises to peaceful and comfortable jute mill fume emission in table 2 Guilin Area Environmental Protection Agency:

Boiler smoke soot emissions situation			Boiler smoke SO ₂Emission behaviour
Boiler smoke soot emissions situation			Boiler smoke SO ₂Emission behaviour			Concentration C	Quantity discharged V	Quantity discharged G	Concentration C	Quantity discharged V	Quantity discharged G
167.98 mg/m ³	5792.46 m ³/hr	0.970 kg/hr	164.86 mg/m ³	5792.45 m ³/hr	0.955 kg/hr	Concentration C	Quantity discharged V	Quantity discharged G	Concentration C	Quantity discharged V	Quantity discharged G

This factory's flue dust clearance of table 2 explanation reaches more than 95% SO ₂Clearance reaches more than 90%, has reached the discharging tentative standard (GBJ of country's " three wastes " ₄-73) requirement.(can discharge 170Kg/hr, SO by this factory's flue gas of national requirements ₂Put 66Kg/hr).

Advantage of the present invention:

The equipment that adopts boiler smoke neutralisation treatment ramie boiled-off waste water to process has the following advantages than other treatment facilities:

(1) treatment of wastes with processes of wastes against one another has alleviated the pollution to environment

Owing to contain a large amount of grits, CO in the flue gas₂Gas and small part SO₂、H ₂S gas. Flue gas is with after waste water fully contacts in averager, and not only the pH value of waste water, COD obtain descending, and the oxious component in the flue gas is corresponding is removed, and flue gas is purified.

(2) processing cost is low, and is easy to operate

Because it is acid that boiler smoke is, in can directly being used for and the retting boiled-off waste water, must not buy from market acid and add and neutralize. Moreover boiled-off waste water can be used as the dedusting agent of flue gas ash removal when being neutralized processing, reduced rinse dosage. Handling process of the present invention is simple, and is easy to operate, and treatment facility is in service, must the personal management, thereby greatly reduce processing cost. 100 tons of boiled-off waste waters of every processing need only 2.00 yuan. More than 20,000 yuan of spending saves production cost every year.

(3) present device can be applicable to paper-making pulping and other alkaline waste water neutralisation treatment.

Claims

1. equipment with the flue gas treatment ramie boiled-off waste water, comprise spray chamber, shower nozzle, the reaction absorption chamber, the smoke entrance pipe, the shower nozzle (1) that several spray degumming waste waters is equipped with at the top that it is characterized in that spray chamber (2), spray chamber (2) bottom is reaction absorption chamber (5), be equipped with orifice plate (4) between spray chamber (2) and the reaction absorption chamber (5), stack gas is led under reaction absorption chamber (5) liquid level by flue gas inlet tube (3), spray chamber (2) top has exit passageway to communicate with kiln (7), smoke outlet tube (8) towards induced draft fan and chimney is arranged at kiln (7) top, and degumming waste water water outlet (6) is arranged at the kiln bottom.