CN1063829A

CN1063829A - Two-stage dust removal and desulfurization device

Info

Publication number: CN1063829A
Application number: CN 91100777
Authority: CN
Inventors: 孟有斌
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-02-04
Filing date: 1991-02-04
Publication date: 1992-08-26

Abstract

The present invention is a kind of dust-removing desulfurating apparatus of coal-burning boiler stove cigarette, constitute by cyclone type dedusting and water bath dust-removing two parts, stove cigarette inlet at cyclone dust collectors is installed a Venturi tube, atomizer is housed in the pipe, under the suction of stove cigarette after the cyclone dust removal, enter further dust-removal and desulfurizing under the effect of cyclone desulfuration device at current at air-introduced machine, can adorn clear water or limewash in the devulcanizer, the top of devulcanizer is provided with infundibulate and adds ash bucket, the addition of control lime, the upper part of its water surface is equipped with a suction port, connect a recirculation pipe, the flue dust of not Ex-all can be sent into Venturi tube dedusting again.This device can have multiple arrangement, and floor space is little, and efficiency of dust collection reaches more than 99%, and desulfuration efficiency is 50-80%.

Description

Two-stage dust removal and desulfurization device

The invention belongs to the treatment facility of coal-burning boiler combustion products, be specifically related to a kind of dust-removing desulfurating apparatus of handling flue dust.

The cleaner of more use divides dry dust removal and wet dust removal two big classes on boiler at present, dry type is representative with cyclone dust removal, though this deduster is simple, auxiliary equipment is less, but its efficiency of dust collection is lower, approximately has only 85%, catches the ability of micronic dust, easily produce secondary fly-up during dust out, and the sulfur dioxide in can not smoke treatment.The gallet water curtain dust collector that wet dust removal such as fiber crops stone factory of Hunan Bo Luo county Xinhua produce, the efficiency of dust collection height can also partially absorb sulfur in smoke (mostly being 20% most), and weak point is that the wet dust removal water consumption is big, the post processing of dust-laden sour water is pretty troublesome, needs more auxiliary equipment.Other has a kind of M type liquefaction device for abatement of smoke and dust of promoting, it divides the two-stage dedusting, the first order is common dry type cyclone dust removal, three layers of orifice plate and three nozzles are housed in the exit, the second level is water bath dust-removing, a gas generator of being made by iron plate and aluminium sheet is installed in the deduster of dress water, and the gas that is taken place enters gas separator, and the gas after the separation is sent into boiler and burnt again.The smoke medicining dust-removing effect of this deduster is better, also can partial desulfurization, and existing shortcoming is that structure is reasonable inadequately, the 1st, the water of nozzle can enter air-introduced machine, make fan belt water, cause condition of work to worsen, the 2nd, the gas generator of soaking in water does not have effect substantially, iron plate also can very fast corrosion, gas separator only is that part stove cigarette is sent, the 3rd, deliver to the gas of blower inlet, and there is not any imflammable gas for the stove cigarette entirely, not only can not overheavy firing, can worsen burning on the contrary.

The object of the present invention is to provide a kind of advantage that collects dry dust removal and water bath dust-removing is the two-stage dust removal device of one, and this apparatus structure is reasonable, be skillfully constructed, but dedusting more than 99%, and have excellent desulfurizing effect.

The present invention includes cyclone type dedusting and water bath dust-removing two parts, a Venturi tube is installed in stove cigarette porch at cyclone dust collectors, atomizing nozzle is housed in the pipe, Venturi tube has two stove cigarette inlets, one is boiler stove cigarette inlet, another and recirculation pipe are connected to the stove cigarette inlet of recirculation pipe, one of recirculation pipe is communicated with Venturi tube, the other end enters in the cyclone desulfuration device by smoke exhaust pipe, and its head connects a taper suction port, and the top of cyclone desulfuration device connects smoke exhaust pipe, interior dress clear water or limewash, its top connects an infundibulate and adds ash bucket, and the bottom is a funnel shaped plasma discharge door, has the inlet opening on the door, the plasma discharge door is communicated with discharge pipe, discharge pipe passes to the dust storage chamber of cyclone dust collectors bottom, has ash-draining gate on the dust storage chamber, dust and mortar can be discharged.

The present invention is elaborated and provide embodiment below in conjunction with accompanying drawing.

Accompanying drawing is depicted as two-stage dust removal and desulfurization device structural representation of the present invention.

1 is cyclone separator among the figure, the 2nd, and Venturi tube, the 3rd, atomizer, the 4th, recirculation pipe, the 5th, smoke exhaust pipe, the 6th, add ash bucket, the 7th, suction port, the 8th, cyclone desulfuration device, 9 overfalls, the 10th, plasma discharge door, the 11st, discharge pipe, the 12nd, inlet opening, the 13rd, air-introduced machine, the 14th, mortar pool, the 15th, dust storage chamber, the 16th, ash-draining gate.

Two-stage dust removal and desulfurization device of the present invention is work like this: the stove cigarette of boiler is under the swabbing action of air-introduced machine 13, at first enter Venturi tube 2, being provided with 3 pairs of stove cigarettes of atomizing nozzle in Venturi tube sprays, make tiny grit in the stove cigarette and the drop generation effective collision in the water smoke, thereby increase the effective dimensions of grit, help in cyclone separator centrifugation to grit, stove cigarette through spraying tangentially enters cyclone separator 1, the grit of isolated humidity falls in the dust storage chamber 15 of cyclone separator bottom in separator, the stove cigarette then passes through the pipeline at separator top after air-introduced machine 13 pressurizations, tangentially enter cyclone desulfuration device 8, clear water or limewash are housed in the devulcanizer, the flue gas that enters blows the water surface, cause the eddy flow of water, splash, mainly be that stove cigarette carried out washing desulphurization except that the stove cigarette is carried out the further dedusting this moment, sulfur dioxide will be absorbed by clear water or limewash, in water, form sulfurous acid or with limewash in and generate the sediment of calcium sulfate.Water in the cyclone desulfuration device dynamically can produce the parabola of a rotation down; the grit that minority in the stove cigarette does not eliminate can reduce gradually to be crowded at the center because of self kinetic energy; the suction port of herein being installed 7 that is connected with recirculation pipe 4 sucks recirculation pipe 4 with these grits; send into Venturi tube 2, once more by spraying, dedusting, desulfurization.Flue gas behind the further dust-removal and desulfurizing of cyclone desulfuration device has not contained dust basically, and sulfur content also reduces greatly, discharges from smoke exhaust pipe 5 at last, and the formed sediment of dust and calcium sulfite falls into devulcanizer bottom, regularly discharging.During discharging, open plasma discharge door 10, mortar (sediment) is subjected to the pressure of water column in the cyclone desulfuration device, can flow into discharge pipe 11 and enter dust storage chamber 15, opens ash-draining gate 16, and mortar and dust fall into mortar pool 14.Replenishing of water entered by inlet opening 12 in the cyclone desulfuration device, and the ash bucket 6 that adds on its top is a funnel shaped ash bucket, aims to add quick lime and establish.

Clear water can be adorned in the cyclone desulfuration device of this device and also limewash can be adorned.When using clear water, along with the raising of sulfurous acid concentration in the water, can reduce desulfurized effect, thereby should after moving 6-8 hour, be neutralized by adding quick lime.The addition of quick lime and joining day can be determined according to the soda acid pH value of ash discharge slurry or the pH value of overfall 9 place's current, should make the water in the devulcanizer keep alkalescence for good.

Embodiments of the invention are such: cyclone dust collector, cyclone desulfuration device and corresponding stove cigarette inlet and outlet piping and recirculation pipe etc. all can be selected general steel plate or the steel pipe manufacturing of 4-10mm for use, and its manufacture craft belongs to general tube sheet processing technology.It in the cyclone separator impact wear that prevents grit, can carry out the abrasionproof processing that cement adds aggregate to inwall, need add anticorrosive coat for preventing at inwall to the corrosion of steel plate in the cyclone desulfuration device, anticorrosive coat can be used the diabase plate, and above-mentioned processing to inwall can be adopted general construction method.The connected mode of each parts all is that flange connects or welding.Being installed in the suction port that connects recirculation pipe in the cyclone desulfuration device is a bell, and the top that can be installed in devulcanizer is apart from the about 250mm of overfall place, and the water surface in the devulcanizer will reach the position of overfall.For guaranteeing that water can not enter air-introduced machine, the camber of cyclone desulfuration device smoke-intake pipe import department can be strengthened.There is the Venturi tube of connection cyclone dust collectors stove cigarette porch, velocity in pipes is selected the moderate data of 30-35 meter per second for use, both brought into play the dedusting effect to guarantee Venturi tube, do not increase stove cigarette resistance again, nozzle bipitch atomizing nozzle, divide front and back to install at two nozzles during installation, nozzle is the next direction of stove cigarette dorsad, and two nozzles stretch in the pipe with two fine steel tube levels respectively.The turnover speed of air-introduced machine control stove cigarette will cause enough negative pressure in cyclone separator, the stove cigarette all sucked, and then barotropic state in the cyclone desulfuration device, can discharge through smoke exhaust pipe to guarantee the stove cigarette behind the dust-removal and desulfurizing.After using this device, the height of smoke exhaust pipe can suitably reduce.Adopt the technical parameter of the above-mentioned dust-removing desulfurating apparatus that is applicable to the 4T/h boiler that manufactures and designs to be: efficiency of dust collection 99.5%, desulfuration efficiency 50-70%(clear water), 70-90%(limewash), exhaust gas volumn 9000-12000 cubic meter/hour, the flowing resistance 90-110 millimeter of water, water consumption 100-200 kilogram/hour.

Two-stage dust removal and desulfurization device of the present invention adopts the Venturi tube spraying to add the method for whirlwind dedusting and cyclone desulfuration water bath dust-removing, makes the stove cigarette be purified processing.Test with standard method through environmental protection unit, efficiency of dust collection can reach more than 99%, desulfuration efficiency 50-80%, and water consumption is few, but enters grey pulp-water still reuse after precipitation process of mortar pool.This device can form series of products, to satisfy the smoke evacuation requirement of 1-20T/h boiler (or hot-water boiler, Industrial Stoves of suitable capacity).This device can have multiple arrangement, and floor space is little, as is used for the newly constructed boiler room, can not build tall and big brick chimney, saves construction investment.

Claims

1, a kind of coal-burning boiler two-stage dust removal and desulfurization device, comprise cyclone type dedusting and water bath dust-removing two parts, it is characterized in that a Venturi tube being installed in the stove cigarette porch of cyclone dust collectors, atomizing nozzle is housed in the pipe, Venturi tube has two stove cigarette inlets, one is boiler stove cigarette inlet, another and recirculation pipe are connected to the stove cigarette inlet of recirculation pipe, one of recirculation pipe is connected with Venturi tube, the other end enters in the cyclone desulfuration device by smoke exhaust pipe, its head connects a taper suction port, the top of cyclone desulfuration device connects smoke exhaust pipe, interior dress clear water or limewash, and its top connects an infundibulate and adds ash bucket, the bottom is a funnel shaped plasma discharge door, have the inlet opening on the door, the plasma discharge door is communicated with discharge pipe, and discharge pipe passes to the dust storage chamber of cyclone dust collectors bottom, have ash-draining gate on the dust storage chamber, dust and mortar can be discharged.