CN102445085A

CN102445085A - High-temperature flue gas and dust dry purification and waste heat recovery process for ore furnace

Info

Publication number: CN102445085A
Application number: CN2010102987946A
Authority: CN
Inventors: 王全祥; ***; 王东
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-08
Filing date: 2010-10-08
Publication date: 2012-05-09

Abstract

The invention relates to a high-temperature flue gas and dust dry purification and waste heat recovery process for an ore furnace. In the process, a flue connected with the ore furnace, a cooling filter, a high-efficiency cyclone separator, a membrane-structural dust precipitator, a cooler, a Roots blower fan, a gas storage tank and the like are utilized. The process is characterized in that high-temperature flue gas from the ore furnace successively passes through the cooling filter, the high-efficiency separator, the membrane-structural dust precipitator and the cooler for cooling down, purification and dust removal, so as to be recovered for use; and meanwhile the dust and heat in the flue gas are maximally recovered, and the problem that ore furnace flue gas and dust recovery and after heat utilization are difficult is solved. The high-temperature flue gas and dust dry purification and waste heat recovery process disclosed by the invention is adapted to high-temperature fume purification and after heat recovery for use for various ore furnaces; and in the process, the flue gas recovered and purified for a completely closed ore furnace is CO, and the gas obtained after purification for the completely closed ore furnace is mainly CO2.

Description

A kind of ore deposit hot stove high-temperature flue gas dirt dry cleaning and waste heat reclaiming process

Technical field:

The present invention relates to a kind of ore deposit hot stove high-temperature flue gas dirt dry cleaning and waste heat reclaiming process, belong to environmental protection dust collecting technique field:

At present the domestic purifying treatment method that is used for mineral heating furnace flue mainly contains two kinds, is respectively wet dedusting and dry method dust, wherein wet method by 1, double tower one civilian flow process, promptly scrubbing tower adopts double-deck nozzle spray type again, the venturi form is adjustable aditus laryngis nozzle water supply type; 2, the two civilian types of two civilian double tower types or single tower; 3, rinsing maching wet cleaning flow process; There is a lot of problems in actual use in wet dedusting, and main cause is that dust is met aquatic alkalize material, and viscosity is big, severe corrosion equipment and cause secondary pollution at high temperature, and useful useful component can not be recycled, all with the abandoned of waste residue form; Dry method dust has cyclone dust removal, bag-type dusting and electrostatic precipitation several types, cyclone dust removal since efficiency of dust collection is low generally all can not be up to standard; Electrostatic precipitation will reduce dust specific resistance, can realize the qualified discharge of dust; Because the exhaust gas volumn of the hot stove in ore deposit is big, dust-laden is many, the tiny light specific gravity of dust granules and have certain viscosity, flue-gas temperature is higher and existence fluctuation to a certain degree; The mineral heating furnace flue variations in temperature is bigger; Its temperature of the different type of furnaces and different processes situation is different; Even the type of furnace of the same race also can change in its temperature of different calcination stages, so mineral heating furnace flue purification recovery is a great problem of industries such as chemical industry, metallurgy always.

Summary of the invention:

The objective of the invention is to design a kind of ore deposit hot stove high-temperature flue gas dirt dry cleaning and waste heat reclaiming process; Specifically be to adopt the middle gas solid separation of the isolated water-cooled cooling in front and back end, the multistage new technology of gathering dust of membrane structure earthenware high-temperature dry: utilize existing ripe efficient cyclone separator, membrane structure tubular deduster; And be equipped with cooling filter, heat exchanger and safe explosion-proof control valve, form brand-new high-temperature flue gas dry method dust and the heat recovery technology of a cover; Through the application of this technology, almost dust in flue gas is all reclaimed, the steam that preheater produces directly uses, and flue gas after being purified all is converted into qualified clean coal gas and utilizes; Can not pollute environment, realize automation control completely, the project technology is rationally advanced, has made full use of waste heat to greatest extent; The flue gas conversion cycles is utilized, and has improved the utilization rate of device, and is energy-saving and cost-reducing, realizes that energy consumption is low; Cost is low, and is pollution-free, and its technology comprises the following steps:

1, the hot stove in the totally-enclosed ore deposit hot fume of high temperature (600～900 ℃) of coming out of the stove at first passes through shell and tube cooler; Drop to the awl bucket with the back that bumps perpendicular to the tube wall of hot blast along tube wall in the high temperature movement of dust particle, gas carries out heat exchange with the pipe inner cold water, under the effect of conduction heat and advection heat; Flue gas heat is taken away; Manage outer elevated temperature heat flue-gas temperature and decrease, horizontal movement to back operation, temperature reduces 200-300 ℃;

2, the hot flue gas behind filter gets into the efficient cyclone dust-precipitator, and dirt powder in the hot flue gas more than 95% is collected into the bottom ash bucket;

The fume that has a small amount of fine dirt powder of 3, discharging from cyclone separator gets into membrane structure earthenware dust-precipitator again, will remain dust and collect once more, at this moment gas dustiness≤20mg/m ³

4, the gas behind membrane structure earthenware dust-precipitator filtration, purification gets into cooler, and temperature has been reduced to below 100 ℃ after cooling off once more, if the hot furnace gases in totally-enclosed ore deposit is CO; The hot furnace gases in non-totally-enclosed ore deposit is C02; When gas is CO, be delivered to air accumulator through roots blower then, directly use as synthesis gas or the fuel gas of producing methyl alcohol, dimethyl ether etc.

Description of drawings:

Fig. 1 is ore deposit hot stove high-temperature flue gas dry cleaning and waste heat reclaiming process schematic flow sheet.

1 is the hot stove in ore deposit among the figure, and 3 is cooling filter, and 3-2 is the water intaking valve of cooling filter bottom; 3-3 is the steam outlet valve at cooling filter top, and 8 is efficient cyclone separator, and 8-1 is the safety valve at efficient cyclone separator top; 13 is membrane structure earthenware dust-precipitator, and 19 is cooler, and 19-1 is the water intaking valve of cooler bottom; 19-2 is the steam outlet valve at cooler top, and 19-3 is the sewage draining exit valve of cooler bottom; 21 is roots blower, and 23 is air accumulator, and 5,10,15 is ash bucket; 25 are strength conveying air blast, and 27 is Pneumatic conveying pipeline, and 28 is feed bin; 28-1 is the powder import; 28-2 is the filter cartridge type dust-precipitator, 2,4,6,7,9,11,12,14,16,17,18,20,22,24,26,28-3 is valve, and 3-1,8-1 and 23-1 are explosion relief valve.

The specific embodiment:

As shown in Figure 1, in the present invention, be example with the hot stove in totally-enclosed ore deposit; 600～900 ℃ of hot fumes of high temperature of coming out of the stove of Fig. 1 at first pass through cooling filter 3; In the horizontal movement of high temperature grit with vertically passing filter 3 in the tubulation tube wall back that bumps drop to the awl bucket of filter 3 along tube wall, flue gas carries out heat exchange with the pipe inner cold water, under the effect of conduction heat and advection heat; The pipe inner cold water becomes steam and discharges its usefulness, manages outer elevated temperature heat flue-gas temperature and reduces to 400～600 ℃; Flue gas gets into efficient cyclone dust-precipitator 8 then, and the most of dirt powder in the hot flue gas is collected; The flue gas that has a small amount of fine dirt powder then gets into membrane structure earthenware dust-precipitator 13, will remain dust and remove; Flue after membrane structure earthenware deduster filters gets into cooler 19, and temperature has been reduced to below 100 ℃ after cooling off once more, is delivered to air accumulator 23 through roots blower 21 then.

For guaranteeing this device safety, even running, cooling filter 3, efficient cyclone dust-precipitator 8, air accumulator 23 tops are provided with safety valve respectively, 3-1,8-1,23-1, and arbitrary link goes wrong, the barrier of can hesitating automatically; In cooling filter 3, efficient cyclone dust-precipitator 8, membrane structure earthenware dust-precipitator 13 bottoms an

ash bucket

5,10,15 is installed respectively; Ash bucket top links to each other with the awl bucket of cooling filter, efficient cyclone dust-precipitator, membrane structure dust-precipitator through flashboard sealed

valve

4,9,14, and the bottom links to each other with the dust conveyance conduit through

flashboard seal valve

6,11,16; Ash bucket

upper valve

4,9,14 is opened, and

bottom valve

6,11,16 is closed, when dust in the ash bucket reaches a certain amount of; In ash bucket, feed nitrogen replacement and go out residual CO gas, close

upper valve

4,9,14 then,

open bottom valve

6,11,16 again and make dust outflow in the ash bucket; After dust all flows out in the ash bucket, go out CO gas in the ash bucket,

close bottom valve

6,11,16 again with nitrogen replacement; Open

upper valve

4,9,14; Recycle, dust flows into airtight pneumatic conveyer 25 and is delivered to feed bin 28 storage uses through pipeline 27, and 28-1 is the dust material import on feed bin top; 28-2 is the filter cartridge type dust-precipitator at repository top, and 28-3 is the valve of feed bin bottom;

Claims

1. ore deposit hot stove high-temperature flue gas dirt dry cleaning and waste heat reclaiming process; It is made up of the flue, cooling filter, efficient cyclone separator, membrane structure dust-precipitator, cooler, roots blower and the air accumulator that are connected with the hot stove in ore deposit; It is characterized in that the hot stove high-temperature flue gas in ore deposit is carried out purifying and dedusting through cooling filter, efficient cyclone, membrane structure deduster, cooler successively to be recycled, and reclaims dust in flue gas and heat simultaneously.

2. according to the said a kind of totally-enclosed of claim 1 ore deposit hot stove high-temperature flue gas dry method dust and heat recovery technology, it is characterized in that: the hot stove in ore deposit comprises that the elevated temperature heat gas cleaning of the hot stoves in various ore deposits such as ferro-alloy furnace, steel-smelting electric furnace, furnace of calcium carbide, boron carbide stove, dust reclaim and UTILIZATION OF VESIDUAL HEAT IN.

3. a kind of ore deposit according to claim 1 hot stove high-temperature flue gas dry method dust and waste heat utilize technology again; It is characterized in that: when the hot stove in ore deposit is totally-enclosed stove; With the elevated temperature heat flue gas of the hot stove in ore deposit earlier through the heat exchange of leaking water in the shell and tube cold filtration organ pipe again and again through efficient cyclone dust-precipitator, membrane structure dust-precipitator two-stage dust cleaning-and then through water cooler; After the flat heat exchange, form low temperature CO gas purified gas and store use in the pipe; Dust content reaches 20mg/Nm in the CO flue gas after the purification ³Below, temperature is lower than 100 ℃, is used to produce chemical products such as methyl alcohol, formic acid, methyl formate, dimethyl carbonate, formaldehyde, polyformaldehyde after treatment; Also can directly do fuel supplies the user to use; If the hot stove in the totally-enclosed ore deposit of right and wrong, flue gas after being purified is CO2, directly emptying or be used for combustion-supporting; The dust rate of recovery reaches more than 99.8%, and metallic element can directly be recycled, and nonmetalloid can be used as hot stove raw material in ore deposit or construction material.

4. a kind of totally-enclosed according to claim 1 ore deposit hot stove high-temperature flue gas dry method dust and waste heat reclaiming process; It is characterized in that: described shell and tube high temperature cooling filter is the shell and tube water recirculation cooler of bottom band awl bucket; The horizontal movement of pipe exogenous wind; Water is walked in tubulation and is moved both vertically, and through heat exchange, converts steam to and in managing, upwards discharges its usefulness.

5. a kind of totally-enclosed according to claim 1 ore deposit hot stove high-temperature flue gas dry method dust and waste heat reclaiming process is characterized in that: described membrane structure deduster is a membrane structure earthenware dust-precipitator.

6. a kind of totally-enclosed according to claim 1 ore deposit hot stove high-temperature flue gas dry method dust and waste heat reclaiming process; It is characterized in that described cooler is that hot flue gas passes through in horizontal tubulation; Pipe is outer to be closed container; The steam that heat exchange produces is discharged through the water receptacle top exit, can with the parallelly connected use of front vertical tube steam.