CN1804526A - Flue gas recovery methods - Google Patents

Abstract

The invention relates to different recycle methods between the outlet and the chimney to recycle the waste heat used to generate steam for electricity generation, based on the temperature difference of waste gas is around 1300Deg. C discharged from the chimney. In the invention, the smoke and dust via variable mediums and methods can generate coal gas, chemical fertilizers, soda and methanol, etc. With said invention, the 21st century can realize high technique content, better economic benefits, lower source consumption and environment protection.

Description

Chemical products from smoke and dust in chimney industry

The present invention relates to the recovery and utilization of smoke and dust discharged from chimney after burning and smelting in chimney industry, and the present chimney industry still discharges a great deal of CO from chimney after dust removal and sulfur removal₂And harmful acid gases and dust, which aggravate atmospheric and environmental pollution, and greenhouse gases which continuously raise atmospheric temperature, natural disasters frequently occur.

The new technology of the invention: aiming at different connection methods of a flue (exhaust port of waste gas smoke) and a chimney in the chimney industry and different temperatures of the exhausted waste gas, different overall recovery methods are designed,and the smoke dust, harmful gases, a large amount of waste heat and greenhouse gases can be thoroughly eliminated after recovery. In the recovery process, various chemical production technologies, media and equipment such as a chemical reaction tower, a waste heat boiler, a gas separator (tower), a hydraulic pump, an exhaust fan, a gas producer and the like are adopted, wherein the chemical reaction tower is internally provided with automatic control equipment (including instruments, an automatic control gate, an exhaust fan and the like). The waste gas (smoke) and dust in the smoke are used for producing various chemical products, the prior production process is changed, the chimney industry is high in technological content, good in economic benefit, low in resource consumption, less in environmental pollution, and the manpower and resources are fully exerted, and the novel circulating comprehensive chemical industry of the chimney industry is realized. Therefore, this technique is not known in the prior art.

Research by scientists of Budoaer et al The reduction temperature can reach 100% only in 5-6 seconds when 1300 ℃, the temperature is low, the temperature is high, and the reduction is introduced according to the temperature and pressure in the gas producer and the chemical reaction; when the temperature is 1200-1400 DEG C Ratio of Much faster, below 700 deg.C The reaction is stopped when the temperature is lower than 660 ℃, and the temperature in the gas furnace is 1100-900 DEG C Can be completely finished.

A carbon dioxide mixed gas generating furnace relates to the existing various gas generating furnaces with different types and water gas furnaces (see figure 1), wherein coal of the existing various gas furnaces enters the generating furnace from a coal furnace (8), and O₂From (11) H₂The steam enters the ventilating pipe (1) from the blast hole (10) and then enters the furnace, flows to the ash slag layer (3) through the blast cap (grate) and is uniformly distributed to further preheat the steam and air, and simultaneously the steam and the air continue to move upwards to enter the blast hole (4) to contact with burning coal to react The large amount of heat is given off. The carbon dioxide with heat continuously moves upwards to enter (5) a reduction layer to contact with carbon Reduction to carbon monoxide. The temperature (gas already formed) is significantly reduced. From the above reaction, the carbon dioxide contacts with carbon at 800-1200 ℃ to produce coal gas.

When the temperature of the waste gas (smoke dust) is below 900 ℃, the waste gas is sent into the coal gas producer from the gas producer (10) (1) and the air is sent into the coal gas producer from the gas producer (11) (1) to be mixed, and the carbon dioxide is contacted with carbon in the combustion layer (4) to generate coal gas. The reaction speed is faster than the original speed, and the coal consumption is less than the original consumption (the original requirement) ， Now only one is used ,). The ratio of exhaust gas to air is determined by the exhaust gas temperature. The exhaust gas temperature is high, the air consumption is less, and the temperature is low, and the air consumption is more.

The temperature of the waste gas is over 900 to 1500 DEG C₂The waste gas from (11) enters the gas producer from (10) the vent pipe, and at the moment, the blast cap (grate) of the mixed gas producer and the vent pipe are made of high-temperature-resistant and high-strength alloy materials or refractory materials to avoid early burning. The waste gas temperature can be over 1200 ℃ and air can be treated by O₂And steam is used for producing water gas. The water gas furnace can be connected to continuously produce water gas.

In a small-sized waste gas furnace (shown in figure 2), overheated waste gas enters a smoke exhaust fan (12) from a pipeline (10) and then is discharged into a pipeline (1), air is discharged into the pipeline (1) and CO from a blower (11)₂Enters the bottom of the mixed gas coal gas generation furnace, enters the furnace grid (2), and then starts oxidation reduction through the contact of ash and carbon, and the slag is removed from the furnace door (4). Coal is put down from the cone (8) and enters the gas furnace (3), the gas flows from the outlet (17) to the speed-regulating hydraulic smoke exhaust fan (18) through the thermometer (15), and the gas enters the gas storage tank (7) and is provided with the pressure gauge (9) and the safety valve (13), and the gas is discharged from the gas storage tank (14). The valve (16) discharges water. It is desirable to generate gas from coke and anthracite. Bituminous coal (which is beneficial to environmental protection due to low sulfur and coal tar content of coke) can also be used, but various instruments are required to be installed and technical training is required to be carried out.

Three representative recovery methods are now introduced:

the first recovery method comprises the following steps:

the technology is designed for various types of furnaces witha waste gas (smoke dust) discharge port at the upper part (5) after combustion (figure 3), wherein in the figure, (1) an air blower (2) a solid (gas and liquid) combustion chamber, some furnaces are called as a melting (smelting) furnace steam boiler, and the like, (3) a dust receiving hopper, the burnt waste gas (smoke dust) enters a dry-humidity adjusting dust-absorbing reaction tower (25) from the discharge port (5) through a set of furnace pressure automatic control system, the upper opening of the tower is large, the lower opening of the tower is small, and the upper part in the tower is provided with a humidity adjusting dust-absorbing reaction towerWater-saving pipe (7) sprays water or chemical liquid from top to bottom, water and smoke dust move in the same direction, force tiny dust to fall into receiving fill (3), meet water when the smoke dust glues on (23) wall and flow to receiving fill (3) along the tower wall when meeting water, the cigarette drenches screen cloth (6) from water and gets into at the bottom of the chemical reaction tower, this tower total number layer, every layer all has chemical reaction's different media (12), present whole coke media that adopt, the exhaust fume temperature gets into at the bottom of the chemical reaction tower from (6) more than 1200 ℃, waste gas moves upward from the bottom and contacts with media coke, impel from the bottom of the body coke contact, make (its reaction temperature is above 700 ℃ C., the more chance of contact More), the produced gas is discharged from the gas storage tower (8) and the gas is discharged from the smoke exhaust machine (20) into the gas storage tower (19) to be stored for chemical production. The above method can be adopted when the discharge port is in the middle. When the discharge port is at the lower part, the discharge port can be directly connected (6) to enter the bottom of the chemical reaction tower for recovery.

If the temperature of the waste smoke is lower than 900 ℃, the water pipe (4) of the layer needs to be changed into an air pipe, and oxygen is sprayed from the water pipe (4)The temperature in the tower can be increased by combustion in the tower, and the temperature in the furnace can also be increased from the combustion furnace, which is beneficial to And gas is produced.

When we need a large amount of CO₂During the process, after the smoke dust is discharged (25), the humidity adjusting water pipe '7' is used for spraying water or liquid from top to bottom in an enlarged way, and in a chemical reaction tower, a small amount of CO and CO is sprayed by each layer of liquid spraying head (4) and medium materials (12) with holes of various geometric shapes for promoting the smoke to contact with the liquid₂And SO₂HF and other gases are dissolved in the water solution, and the water solution is dropped into the mixed water pool (13) and then flows into the closed water reservoir (17) through the discharge pipe (15). N not changeable with aqueous solutions and media materials₂And a large amount of CO₂Flows to (10) ammonia plants and (11) chemical plants. Separating CO by high (low) compression separation or chemical medium decarbonizing tower and "PMS" and "PSA" technologies₂、N₂Stored in (19) and (29), in ammonia plants, the CO is introduced₂Then put into a gas furnace to produce gas, and N is added₂Gas and H₂The gas is further refined by medium, etc., and finally after medium pressure or high (low) pressure ammonia washing, the gas is put into an ammonia tower after reaching the purification requirement, and ammonia is produced under the action of certain temperature, pressure and catalyst. About 2600Kg of steam can be produced per ton of ammonia, 800Kg of self-consumption steam and 1800Kg of steam are left, the steam is output and put into (14) for power generation, and the tail gas after power generation can be used for life.

Introducing CO₂Putting the mixture into a soda ash factory (21) for production and use. Gaseous ammonia enters an ammonia absorption tower in the (21) alkali making plant and is dissolved with salt solution to produce ammoniated brine, and the temperature is reduced to 30-35 ℃ and then enters a carbonic acid tower and CO₂The crystal mother liquor produced by chemical combination flows into a filter to enter a converter for heating and calcining to produce soda ash and ammonium chloride. Decomposition of CO₂Pressurizing and returning to the carbonic acid tower for recycling.

Chemical workshop CO₂N₂Further processing and producing chemical products required by the market. Such as: the price of dry ice required by the beer industry is 1300 yuan per ton, and in some regions, much ammonia is heard as little CO₂Urea cannot be produced completely, at which point CO is removed₂Pressurization and liquid ammonia from the freezing section. Both of these are fed to the bottom of the urea synthesis column simultaneously with the ammonium solution from the recycling step, which constitutes NH₃/CO₂～4，H₂O/CO₂About 0.7% CO after sufficient combination time at 188 ℃ under 19.71MPa (Table)₂Is converted into urea. After the pressure of the melt produced in the reaction process is reduced, the melt is decomposed for a period of time to obtain 1.76MPa]And two-stage decomposition [0.29 to 0.39MPa (absolute)]Then passing through a flash evaporation tank (0.044 Mpa)]And general evaporation heating (0.03 MPa (absolute), t temperature of 130 deg.C)]Two-stage evaporation heating (0.03 MPa (absolute), t temperature 140deg.C)]Then urine is produced, and is sent to a prilling tower through a melting pump, and finished product urea is obtained through prilling, and unconverted gas and liquid are recycled through first-stage circulation and second-stage circulation. The above data are obtained from a factory for reference only.

CO available to agricultural products₂Preservation and corrosion prevention are carried out, and Japan adopts CO in plastics₂Change its performance to make plastic become non-toxic product, some liquid CO for freezing₂And liquid N₂The CO is used for replacing Freon for refrigeration, and is used in the medicine field, the food industry, the fire-fighting product and the like₂And N₂And (4) qi.

The water in the gas is discharged from (9) into a circulation tank (18), and H in a sealed water reservoir (17)₂CO₃HF are extremely active molecules, and the HF are decomposed from water with little change of conditions, so that other products can be recovered and produced. HSO₃Or HSO₄、H₂CO₃HF aqueous solution through CaCO₃MgCO₃Neutralizing the powder or alkaline material and then flowing into a circulation tank (18) to form CaF₂、CaSO₃、MgSO₄And Ca (HCO)₃)₂The product can be used in paper making and glass ceramic industries, and can also be used for burning cement, chemical fertilizers and the like.

The combustion boiler has many types, the smoke dust discharge ports are basically similar, and some discharge ports are arranged at the position (5) and some discharge ports are arranged at the position (6) and can be connected with a mixed gas coal gas producer and a water gas producer, and produced coal gas or water gas can be supplied for production, life and chemical production. The coke is hoped to be adopted for carrying out chemical reaction to produce coal gas, and other solid fuels can be used as the coke contains low sulfur and coal tar, which is beneficial to environmental protection. Demolish the chimney

The second recovery method comprises the following steps:

please refer to fig. 4: the waste gas is discharged from a workshop flue, two flues are connected between a large flue and a chimney (the large-volume waste gas chemical equipment can not meet the production requirement and can be connected with a plurality of flues to produce different products), and the chimney is dismantled.

Two flues are introduced as an example: the automatic control (gate) valve of kiln pressure is installed on each side, one side is opened as 'A' and the other side is closed as 'B', and all the parts of 'A' and 'B' are identical, and only when the 'A' is in obstacle, the 'B' is opened to keep the stability of the current production. When smoke dust firstly enters a '1' waste heat boiler from 'A', (the main basic principles of the waste heat boiler are different from each other), the waste heat boiler generates a large amount of steam, and can be matched with (9) a steam turbine generator unit to generate electricity for production and life, and can also be used for producing electrolytic H₂、O₂. Waste gas and dust in the smoke enter a dust removal chamber for 2 'dust removal and then enter a 3' water-cooled smoke exhauster for discharging (4) and storingThe waste gas in the gas tank (water-cooled smoke exhauster can also be placed in front of waste heat boiler) is discharged into chemical reaction tower (7) or directly into chemical production line (8) to produce chemical products

The waste gas can also be directly discharged into the gas producer (10) through the smoke exhaust fan (6) to produce gas for production, and the surplus gas issent into the gas storage tank (4) for chemical production. If the coal gas contains dust and high sulfur, the coal gas can be discharged into (2) for dust removal and then into (7) a chemical reaction tower for sulfur removal and then into (4) a gas storage tank (tower) for storage for chemical production or civil use.

The third recovery method is a kiln group with regenerators:

the types of the furnaces are various (see figure 5), the flue can start from the upper parts (1) and (5) of the regenerator, the exhaust gas temperature of the region is over 1000 ℃, the exhaust gas temperature of some furnaces is about 1500 ℃, the furnace types are complex, the flue is long, and the flue has a name everywhere, and I do not explain one by one; however, the furnace type can put various media and chemical raw materials into different parts to carry out chemical reaction by utilizing the advantages of long high-temperature area of the flue and the like.

Designing a first mode: glass melting furnaces, ancestor engineers, to improve melting and fining; the heat efficiency is improved, and small furnace fire nozzles (1) and (5), regenerative chambers (3, 4, 8, 7), checker bricks and the like are protected; therefore, a symmetrical small furnace, a heat storage chamber, a flue and the like are designed. Please see (fig. 5) that the highest point of the temperature in the furnace is above 1500 degrees, so as to avoid the furnace body from burning out and improve the heat efficiency, therefore, after every X minutes, the functions of the furnace body and the furnace body are exchanged to play the roles of absorbing and conducting heat. Air and coal gas move upwards through checker bricks of the regenerators (3) and (4) to absorb heat energy of brick bodies from the rise, the air and the coal gas are intersected and mixed at the small furnace mouth (1) and sprayed into the smelting furnace for combustion, the air and the coal gas are drilled into the small furnace mouth (5) at the opposite side during the combustion, respectively flow to the empty (7) and coal (8) regenerators to conduct high-temperature waste heat to checker anvils in the two regenerators, then enter ash pits (12) and (13), then enter a large flue through a seven-turn eight-turn flue and finally jointly enter a large flue to be mixed and flow to a chimney. Thus, the checker bricks on the upper part of the regenerator are always burnt out due to mutual exchange, absorption and heat release, and the temperature of the waste gas entering the regenerator is about 1500 ℃, so the heat is released from the checker bricksThe partial checker bricks are often burned out. According to the principle, a steam pipe is properly added to the upper part of the regenerator, and proper steam is sprayed according to the time of waste gas inlet, so that the temperature of the rest part of the checker bricks on the upper part of the air regenerator is not changed, and a chemical combination reaction is carried out, thereby a large amount of N is obtained₂CO₂Conversion to NO, CO, H₂And the like.

The gas regenerator discharges a large amount of unburned gas from chimney every time of changing fire, so the production is normal, therefore, the prior checker bricks are changed into carbon bricks with various geometric shapes and carbon content of about 80 percent, or into coke blocks which are pushed and discharged layer by layer, so that the unburned gas and the coke blocks absorb heat in the inflow of waste gas, are decomposed and are combined to produce gas. When the original waste gas is converted into the inlet gas in the gas regenerator after the fire is changed, a large amount of CO + C in the gas does not work, and only H, O + C in the gas is chemically changed to generate CO or HC compounds, so that the method is beneficial and harmless to production.

The gas produced by the air-gas heat storage chamber is separated or mixed to enter a storage device and is determined by each chemical workshop according to the production requirement,

designing two:

the original air gas regenerator process state is maintained (the method is also suitable for other chimney industries), a herringbone flue is connected between a large flue and a chimney, and the chimney is dismantled. See (figure 4) the herringbone flue each side all installs the automatic control floodgate (valve), the gate is opened for "A" on one side, the another side is closed for "B", "A", B "each apparatus is the same, only cross use, after the smoke and dust enters the waste heat boiler" 1 "from" A "and enters the dust remover" 2 ", send into the heat preservation air storage tank" 4 "(tower) from the smoke exhaust machine" 3 ", send the waste gas into (10) the mixed gas coal gas producer by the pressurizer" 6 ", produce various necessary coal gases by the chemical reaction, send to" 8 "chemical production line again, this method thermal efficiency is not high that the previous design.

Designing three steps:

the checker bricks of the gas regenerator adopt carbon bricks (coke blocks) in the first design, the air regenerator adopts the second design method, so that the waste gas respectively runs to one direction after passing through the air-gas regenerator, and the waste gas coming out of the air regenerator directly enters CO₂After the gas producer produces gas, the gas enters a gas tower to be mixed with the gas produced by the gas regenerator, and the surplus gas except for self-use is put into a chemical production line.

Designing four:

some furnace bodies are too small, and under the condition that chemical reaction towers cannot be arranged at two sides of the gas regenerator, waste gas discharged by the air gas regenerator can be respectively and directly conveyed into CO through the flue₂The mixed gas furnace produces gas or the water gas can generate H after the water gas is generated₂And (4) qi. Separating pure CO + H from decarbonizing tower in ammonia production₂In a high-temperature high-pressure synthesis tower, under the condition that the temperature of a catalyst copper hot spot is 200-310 ℃, the resistance value of an electric heater insulation resistor is more than 0.2m omega, the pressure of a crude alcohol tank is less than or equal to 0.6Mpa, crude methanol is generated with the help of the catalyst copper hot spot temperature,

the crude methanol is separated and rectified by condensation (the outlet temperature of a water cooler is less than or equal to 40 ℃) to produce refined methanol.

The main pressure and temperature in the rectification process of the refined methanol are as follows:

the steam pressure is more than or equal to 0.3Mpa (the pressure at the bottom of the main tower is less than or equal to 0.05Mpa, the temperature at the bottom of the main tower is less than or equal to 108 ℃), the temperature at the top of the main tower is less than or equal to 64-67 ℃, the pressure of the refined alcohol tank is less than or equal to 0.1Mpa, the pressure of the feed of the pre-tower is less than or equal to 0.2Mpa, the temperature at the top of the pre-tower is less than or equal to 62 ℃ (the pressure at the: the explosion risk of the methanol is higher than that of the ammonia, and the production of the methanol must be operated according to the process requirements of local equipment.

Electric stove

An electric furnace in smelting, which, although not using fuel, discharges a large amount of dust and CO with high temperature insmelting₂The gas, discharged into the atmosphere, where the dust is tested as being a precious metal and must therefore be recovered and subsequently classified for purification according to local requirements, or into CO₂The gas producer produces gas. If the dust in the smoke belongs to silicate, the dust can directly enter CO₂The gas producer produces gas, and then enters a chemical production line.

The coal gas or the water gas can be burnt, and can also be matched with an advanced technology according to local requirements to produce chemical products; such as:

the CO is converted into the methanol and the dimethyl ether in a single pass, the conversion rate can reach 90 percent, the synthesis gas can be generated by water gas, and the synthesis gas can be used for producing synthetic ammonia, nitric acid, urea and methanol in industries and up to fine chemical engineering, so that the cost of raw materials of the synthesis gas can be reduced by about half compared with the cost of gas extracted by other methods at present.

The chimney industry can flexibly apply the above various recovery methods to carry out all recovery according to local conditions, and can bring favorable income for enterprises.

The following are exemplified:

such as: the flat glass factory adopts a float production line at present, waste smoke and dust are exhausted by virtue of chimney draft, the temperature of waste gas at the root of a chimney is about 400 ℃, the temperature of waste gas exhausted by an additional smoke exhaust machine of a waste heat boiler is about 200 ℃, if the smoke and dust are recovered, the exhausted waste heat of 200 ℃ can be fully utilized to generate steam, and the steam is more than the waste heat steam which can generateelectricity and can be used for production or life gas.

The flux soda ash can not be separated in the production of flat glass, the consumption amount of the flux soda ash accounts for 12-20% of the raw materials, the main raw materials for producing soda ash are ammonia, salt and carbon dioxide, an ammonia fertilizer factory is arranged near a salt production area, soda ash can be produced in the glass industry, the transportation cost and the cost of carbon dioxide are reduced, energy and mineral resources are saved for China, and a byproduct NH is generated₄The CI chemical fertilizer can be sold to agriculture, and its impurity can be used as raw material and fed into kiln, and can prevent waste residue from polluting environment

The carbon content of the same coal is assumed to be 72 percent; calculated by burning 100 tons of raw coal per day

Name (R)	Quantity per ton	Yuan/ton	Total/ten thousand yuan	Remarks for note
					Production of CO2 Output N2Qi (Qi) Purchase of NH3 Purchased salt Yield of Na2CO3 Yield of NH4CI	264 ton of 644 104 490 636 321	1200 250 1250 350	And 12.48 And 12.25 Ten 79.50 Ten 11.235	Is (one) a expenditure (ten) income
Total up to			Ten 66.005
					Annual output value 3.32Billion yuan.			Gross profit all year round 2.4Billion yuan.

The above calculation does not include the gases decomposed from the raw materials, and errors in the calculation are only used as references:

the recovered nitrogen can be supplied to a tin bath section of a float glass plant for use, the nitrogen does not need to be purchased any more, and the nitrogen can also be used for producing liquid nitrogen to be supplied to a freezer for refrigeration. And water exceeding the self-consumption amount is also recovered in the recovered smoke dust, (mainly because raw coal or heavy oil, natural gas, raw material molecules in smelting and air contain water molecules, the water after high-temperature combustion decomposition and the added water are changed into hydrogen and oxygen to be decomposed, and the hydrogen and oxygen are cooled to form water which can be directly used for production ingredients without treatment, and impurities in the water are mainly from glass raw materials and do not need to be treated), and other trace gases are recovered and utilized by different methods according to specific components.

The chimney industry of cement factories, breweries, thermal power plants and the like can also adopt the technology to recover and produce sodium carbonate or urea, produce synthetic ammonia, nitric acid, methanol industry, dry ice and inorganic chemical products, and waste residues can also be returned to the furnace to produce other chemical products such as cement and the like.

The beer industry requires dry ice at a price of 1300 dollars per ton,

from the conclusion that the chimney industry flexibly applies the new method to completely recover the smoke dust, the favorite income is brought to enterprises, new chemical production lines are brought to the enterprises, new employment opportunities are brought to urban and rural people, blue sky is brought to cities, the air temperature of surrounding areas is reduced, and a large amount of inhalable particles in the air are reduced

The chimney industry is developed into a novel circulating chimney-free novel comprehensive industry which has the advantages of high technological content, good economic benefit, low resource consumption, less environmental pollution and full exertion of human resources.

If three hundred million tons of CO are recovered every year in China₂The carbon and the oxygen are recycled, nearly hundred million tons of raw coal are saved invisibly, 2.1 million tons of oxygen are saved, and compared with hundreds of millions of acres of various forest planting in China, hundreds of millions of cubes of greenhouse gases are reduced in the atmospheric layer every day, the temperature is lowered, the wind and rain are adjusted smoothly, and the national peace and peace are realized. The method has the advantages that a good growing environment is brought to crops, pollution of the crops is reduced, plant diseases and insect pests are reduced, water is not taken from rivers and lakes in chimney industrial production, water is discharged into the rivers and lakes, (as the recycled water exceeds the water used in production, main raw coal or heavy oil, natural gas, raw material molecules in smelting and air contain water molecules, the water is decomposed by high-temperature combustion and the added water is changed into hydroxyl molecules to be decomposed, and the hydroxyl molecules are cooled to form water, so that the surplus water is discharged), more upstream river water is not cut off at the downstream, the downstream agricultural water is more convenient, the crops have water and various fertilizers which are supplied in large quantities, the crops grow better and faster, and the income of farmers is increased. The industrial pollution control also increases the income, and is rich in all the country! More money, more water, more grain and cotton, more other industrial products, less pollution in the air, normal climate and less diseases, so that she has joy to our.

The types of the "chimney industry" furnaces are very various,and similar or similar methods are used for drawing for explaining the problems and shortening the documents, but only fig. 1 or fig. 2 are used in the description, so that the supplementary description is as follows:

FIG. 1: the section of the gas stove is similar to the intention form;

FIG. 2: is in the form of a similar process diagram with a section similar to a small gas furnace;

FIG. 3: the section of the combustion, melting, smelting furnace and steam boiler is similar to the graph form;

FIG. 4: in the form of a production plane similar to a schematic diagram;

FIG. 5: the section of the furnace group with the regenerative chambers is similar and is similar to the intended form;

Claims (6)

1: the method for producing chemical products from smoke dust in chimney industry includes recovering from exhaust port of furnace body to chimney root, and features that the furnace has complicated shapes and varieties, the temperature difference between discharged smoke dust is about 1300 deg.C, the performance difference between smoke dust is very large, and the chemical products produced in chimney industry are different, so the method used is different, and the following methods are used cumulatively:

the automatic control system for kiln (furnace) pressure is composed of automatic control set (including instrument, smoke exhauster and control gate valve), waste heat boiler, pressurizer, power plant, dry-humidity regulation and dust-collecting reaction tower, ash receiving hopper, waste water treating pool, medium chemical reaction tower (including chemical combination and decomposition),gas storage tower (tank), various gas separation and purification machines (tower), gas producer (water-containing gas furnace) and ammonia plant and chemical plant. Some products can be produced by the methods. The chimney industry becomes a comprehensive industry without chimneys, and the chimneys can be disassembled.

2： The waste gas outlet (flue) can be directly connected with a mixed gas furnace or a water gas furnace, so that one of an air pipe or a steam pipe entering a generator furnace is changed into a waste gas outlet pipe, and the waste gas can be reacted with coke or coal, the medium carbon can be used for producing CO in a chemical reactor (tower), or carbon bricks (coke) are added in a regenerator to produce coal gas, or the waste gas outlet (flue) can be directly connected with a small gas furnace to produce coal gas.

3: when the temperature of the waste gas is higher than 900 ℃, the ventilation pipe of the blast cap (grate) is replaced by a high-temperature-resistant and high-strength material so as to prevent the blast cap from being burnt out prematurely. The grate and the ventilation pipe can also be made of refractory material, CO₂Low temperature, high output of air and CO₂When the temperature of the steam is over 1200 ℃, the air supply is stopped, and the steam is properly added to be beneficial to continuously producing the water gas.

4: the waste gas can be recovered by a method of a double-phase flue (a plurality of flues) similar device, when the A is obstructed, the standby B is opened to keep the stability of the existing production.

5: although the electric furnace doesnot use fuel, the gas discharged after smelting is CO₂And the like, and chemical products can also be recycled and produced.

6: the waste gas can be recovered by a plurality of flues and different methods to produce different products.

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