CN103090378A

CN103090378A - Boiler fire coal processing process

Info

Publication number: CN103090378A
Application number: CN2011103382983A
Authority: CN
Inventors: 朱新国
Original assignee: XINSHAO DEXIN INSULATION PAPERBOARD CO Ltd
Current assignee: XINSHAO DEXIN INSULATION PAPERBOARD CO Ltd
Priority date: 2011-10-27
Filing date: 2011-10-27
Publication date: 2013-05-08

Abstract

The invention relates to a boiler fire coal processing process. According to the invention, raw coal is processed by using a vibration sieve and a crusher; qualified coal particles are delivered into a cylindrical sieve by using a belt conveyer, such that particles with sizes below 3mm and particles with sizes above 3mm are separated; the particles with sizes below 3mm are delivered into a double-helix mixer through a conveyer belt; 1-10% of sludge obtained after sewage processing is added as a binder; 3-6% of slaked lime is added as a sulfur remover; the materials are uniformly stirred; water content is controlled at 5-15%; the mixture is delivered into a high-power ball pressing machine by using a conveyer belt, and is manufactured into ball-shaped coal particles with diameters of 15-30mm by using the high-power ball pressing machine; the ball-shaped coal particles are delivered into a coal storage hopper with the separated coal particles with sizes higher than 3mm; and the materials are delivered into a fluidized bed through a coal feeder and are combusted. With the process provided by the invention, pollution of sludge after sewage processing can be reduced, atmosphere pollution caused by fluidized bed boiler soot can be reduced, and coal consumption can be saved.

Description

A kind of boiler fired coal treatment process

Technical field

The present invention relates to a kind of boiler fired coal treatment process, particularly the coal-fired treatment process of CFBB.

Background technology

Burning in circulating fluid bed boiler mechanism:

The main body of CFBB mainly is comprised of fluid bed, burner hearth, cyclone separator three parts.This stove main feature circulating ratio is relatively high, and it is wider that it adapts to coal, and the meager coal that fugitive constituent is low, ash is high, calorific value is lower also can better burn in fluidized-bed combustion boiler.Coal charge particle rolling up and down in bed of material during burning, the fluid bed position presents larger malleation, the upper furnace negative pressure increases and increases gradually with furnace height, some less particles are entrained with burner hearth by air inducing with flue gas, in order to collect these relatively fine particles, be provided with gas at the burner hearth exhanst gas outlet---solid separator (cyclone separator), be collected the particle that gets off and return to the fluidized bed circulation burning, overwhelming majority fine particle is by after-flame, but flue gas still can be carried away a part of fine particle secretly, enters in cigarette ash water or by air-introduced machine by water dust scrubber and enters atmosphere.In addition, burning in circulating fluid bed boiler mechanism is the goods fluid burning, therefore its exhaust smoke level substantially exceeds the stove kinds such as chain furnace.

The weak point of CFBB:

Compare by analysis, CFBB is coal-fired adopts traditional broken Screening Treatment technological process as shown in Figure 1: 25% left and right that accounts for total qualified Coal-fired capacity below particle 3mm, although it is wide to have applicable coal, the slag carbon content is lower, and outstanding advantages is sparing in the use of coal.But still have weak point during operation:

Although 1 most of molecule is after-flame, yet, when moving because of CFBB, when especially load is higher, fluid bed and lower furnace portion malleation are larger, and upper furnace negative pressure gradually is larger, and flue gas flow rate is fast, still some has little time burning or the inadequate fine particle that burns is carried secretly by flue gas and entered in cigarette ash water or enter atmosphere, analyzes data and shows in the cigarette ash sedimentation basin that the cigarette ash calorific value still has 800 kcal/kg left and right.

2, CFBB and ebullated bed have similarity, Fluidized Bed Partial is larger malleation, the roof of the furnace negative pressure strengthens gradually, exhaust gas volumn exceeds more than chain furnace etc., parts of fine granule even coal dust is relatively short at fluid bed or the burner hearth time of staying, is carried to be carried secretly by air-introduced machine by deduster to enter atmosphere impact smoke evacuation quality by flue gas, dustiness is larger, the SO in flue gas ₂Content is also higher.

Although 3 these type of furnaces have the low advantage of coal consumption, coal consumption is relatively large is still an outstanding problem.

Summary of the invention

The objective of the invention is to change the coal-fired treatment process of CFBB tradition, a kind of new coal-fired treatment process is provided, solve CFBB smoke contamination and the high problem of coal consumption, embody environmental benefit, Social benefit and economic benefit preferably.

The object of the present invention is achieved like this: a kind of boiler fired coal treatment process is characterized in that: the qualified coal grain after raw coal is processed through vibratory sieve, disintegrating machine, and send into drum sieve through belt conveyer and isolate the following particle of 3mm and the above particle of 3mm; The following particle of 3mm is sent into twin-shaft mixer by belt conveyer again, then add the mud after the sewage disposal of 1-10% to make binding agent, and add the white lime of 3-6% to make sulfur elimination, after stirring, moisture control 5-15%, enter belt conveyer and send into powerful ball press, be pressed into diameter 15-30mm ball egg type coal particle through powerful ball press, send into the storing coal bunker by belt conveyer together with coal particle more than 3mm that drum sieve is separated again, then send into the fluidized-bed combustion boiler burning through feeder.

Advantage of the present invention is: simple in structure, flow process is simple, and is easy to operate, and security is good, and the mud after the minimizing sewage disposal pollutes, and reduces the fluidized-bed combustion boiler flue dust to the pollution of atmosphere, is sparing in the use of coal.

Description of drawings

Fig. 1 is the coal-fired processing technological flow figure of CFBB tradition;

Fig. 2 is process chart of the present invention.

The specific embodiment

Enforcement exemplifies 2, and for saving space, 2 example data no longer repeat when identical, and not simultaneously, the data of example 2 are in bracket.as shown in Figure 2, in the processing of fire coal, changed processing mode traditional in Fig. 1, sending into drum sieve 4 screenings through the qualified coal particle after vibratory sieve 1 and disintegrating machine 2 (granular size that adapts with the fluid bed furnace burning) by belt conveyer 3 separates, the following fine particle of 3mm is separated and enters belt conveyer 5 and send into twin-shaft mixer 6, this part particle accounts for 25% left and right of whole qualified particles, add mud behind 1 (10) % Sewage station as binding agent, add again the white lime of 3 (6) % as sulfur elimination (calculating the white lime amount that need add according to coal-fired sulfur content), fine breeze, the environment-protective water lignin-sludge, the moisture content of white lime compound is 5 (15) %, after stirring by twin-shaft mixer together, send into the powerful ball press 8 of the two rollers of " 250 * 400 " type by belt conveyer 7, material is forced to be pressed into to be of a size of the ball egg shape particle that 25mm has some strength by the extruding force of 40 tons of left and right, send into bucket elevator 10 together with the coarse granule about the 3-15mm that is separated by drum sieve through belt conveyer 9 and enter coal hopper 11, send into fluidized-bed combustion boiler 13 burnings through feeder 12 again.Some strength is arranged because of a large amount of duff particles after due to balling-up, greatly extend in the fluid bed time of staying, separated by cyclone separator the chance of returning to the fluidized bed circulation burning through material returning device after burning and has also improved, resembling does not fully burn traditional coal-fired treatment process or have little time to burn to be carried secretly by flue gas enters in the cigarette ash pond or enters atmosphere and the chance that is lost just greatly reduces.In addition, intensity and not bery high after the duff particle balling preparation is along with the HTHP in fluid bed and storeroom mutually collide, perturb, rub, the ball egg also can explode and come, on fluid bed and not impact of burning, and in the cigarette ash pond, the cigarette ash calorific value below 400 kcal/kg, has reduced the consumption of coal; Simultaneously, owing to having added white lime in balling-up, played the effect of sulphur removal, smokestack smoke evacuation SO ₂Deng the corresponding minimizing of pernicious gas.

Various performance analyses after the coal-fired treatment technology of CFBB:

1, the mud after sewage disposal is the mixtures such as fiber fines, inorganic matter, organic matter, glue class thing, effect binding agent and duff particle compacting balling-up burning, the secondary pollution of mud after the minimizing Sewage.

2, add white lime and duff particle balling preparation after, force to have strengthened circulation in stove, fully burning, and reached the purpose of sulphur removal improves the smoke evacuation quality, alleviates environmental pollution.

3, after the mixture such as the fiber fines in environmental protection mud, organic matter, colloid and duff particle, white lime are suppressed balling-up, flue dust calorific value in flue gas reduces greatly, mixture in mud is burned release heat also, thereby reduce the consumption of coal, be sparing in the use of coal, economic benefit and social benefit are also deposited.

Claims

1. boiler fired coal treatment process is characterized in that: the qualified coal grain after raw coal is processed through vibratory sieve, disintegrating machine, and send into drum sieve through belt conveyer and isolate the following particle of 3mm and the above particle of 3mm; The following particle of 3mm is sent into twin-shaft mixer by belt conveyer again, then add the mud after the sewage disposal of 1-10% to make binding agent, and add the white lime of 3-6% to make sulfur elimination, after stirring, moisture control 5-15%, enter belt conveyer and send into powerful ball press, be pressed into the ball egg type coal particle of diameter 15-30mm through powerful ball press, send into the storing coal bunker by belt conveyer together with coal particle more than 3mm that drum sieve is separated again, then send into fluidized bed combustion through feeder.