CN212252637U

CN212252637U - Coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment

Info

Publication number: CN212252637U
Application number: CN202021782452.7U
Authority: CN
Inventors: 温向阳; 徐文静; 张志强; 翟文科
Original assignee: Hebei Saihe Engineering Technology Co ltd
Current assignee: Hebei Saihe Engineering Technology Co ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2020-12-29
Anticipated expiration: 2030-08-24

Abstract

The utility model discloses a carbonaceous is useless combustion utilization admittedly and is handled with sintering gas cleaning's coupled system relates to the carbonaceous and useless combustion utilization field admittedly. The coupling system comprises a sintering system, a sintering flue gas purification treatment system connected with the sintering system and a carbon-containing solid waste combustion utilization system, wherein a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, and a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system. The utility model couples the sintering production process and the carbon-containing solid waste combustion process, realizes the ultra-clean emission of final flue gas, can effectively recover the heat energy of the carbon-containing solid waste and the sintering flue gas, and realizes energy conservation and consumption reduction; in the reaction furnace, the carbon-containing solid waste and the sintering flue gas are subjected to combustion reaction, dioxin in the flue gas in the reaction furnace can be thoroughly decomposed, carbon monoxide can be consumed, pollution-free carbon dioxide is generated, and the emission of pollutants is further reduced.

Description

Coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment

Technical Field

The utility model belongs to the burning field of utilizing admittedly that contains carbon, concretely relates to coupled system that burning utilization and sintering gas cleaning handled admittedly that contains carbon, it is through producing sintering, the solid two process couplings of burning that waste of containing carbon, has realized the ultra-clean emission of final flue gas, can effectively retrieve the heat energy of the solid waste of containing carbon and sintering flue gas simultaneously, has realized energy saving and consumption reduction.

Background

Coal is taken as a main energy source in China, the annual coal consumption is about 40 hundred million tons at present, and the coal yield in China is about 3.5 hundred million tons in 3 months in 2020. 70% of coal in China is utilized by combustion, and a coal-fired power plant, a coal-fired thermal power plant and the like are typically applied. SO is generated in the combustion and utilization process of coal₂、NO_XDust, and the like, and washing of coal is a preferred choice for reducing coal-fired pollutants. The washing of coal is an important component of clean coal technology, and the ash content and the sulfur content of the coal are reduced through the washing so as to improve the coal quality. The method comprises the following steps: washing and selecting 1 million tons of raw coal, generally reducing SO discharge of fire coal₂About 100 to 150 ten thousand tons. In order to further improve the atmospheric quality, the proportion of the washing and dressing coal is gradually increased. The proposal of the action plan for the efficient utilization of coal (2015-2020) is as follows: by 2020, the raw coal dressing rate reaches more than 80%. The coal washing and dressing can generate two kinds of carbon-containing solid wastes of coal gangue and coal slime, and in order to utilize chemical energy in the coal gangue and the coal slime, most of the coal washing and dressing adopts a traditional combustion mode. However, by adopting the traditional combustion mode, the pollutants contained in the carbon-containing solid waste are only transferred but not really eliminated, and the effect of coal washing and dressing is greatly reduced. Increased pollutant emissions can also result if the combustion flue gas is improperly disposed of or becomes spent. In order to reduce the amount of pollutants discharged from coal and carbon-containing solid fuels, it is a first-choice objective to develop a desulfurization and denitrification technology with higher efficiency. However, the above technical route has high cost and high energy consumption, and has a bottleneck in the discharge amount of pollutants.

Huge steel and iron in our countryThe industry is possibly coupled and linked with the carbon-containing solid combustion utilization, and through the coupled development between a certain process of steel production and the carbon-containing solid waste combustion, the carbon-containing solid waste or coal combustion utilization zero emission can be realized. Therefore, the characteristics of each process of steel production need to be subdivided, and the carbon-containing solid combustion is embedded in a certain production unit, so that a carbon-containing solid waste combustion flue gas pollution zero emission technology is developed, and the real purpose of coal washing is realized. The sintering production is one of the important process units in the modern steel production, and the flue gas volume of a large sintering machine which is well sealed per ton of ore production is 3000 m³. The untreated sintering flue gas contains CO and CO₂、N₂、O₂、SO₂、NO_X、H₂O, dioxin, various dusts and the like, wherein the volume percentage contents are respectively as follows: CO-1%, O₂～16%、H₂O is 10 percent and dust is 10g/m³The sulfur dioxide content is generally 800-1500 mg/Nm³The content of nitrogen oxides is 100-450 mg/Nm³Dioxin concentration 3ng-TEQ/Nm³. The average temperature of sintering flue gas is 150 ℃, and the physical heat is 195 kJ/Nm³Sintering flue gas CO is 1 percent and flue gas chemical heat is 120 kJ/Nm³. In the sintering plant of the domestic iron and steel company, sintering flue gas is subjected to desulfurization, denitration and dust removal to reach the discharge standard established by the state and then is discharged into the atmosphere. In the purification treatment process of the sintering flue gas, CO contained in the flue gas cannot be treated and is discharged into the atmosphere along with the flue gas. The existing treatment facilities have no obvious effect on eliminating dioxin and can cause pollution to the atmosphere when being discharged to the atmosphere. In addition, the physical heat contained in the sintering flue gas is not effectively utilized from the analysis of the operated sintering production system.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of prior art, the utility model aims at providing a carbonaceous is useless burning utilization and sintering gas cleaning handle's coupled system admittedly, its through with sintering production, carbonaceous are useless two process couplings of burning admittedly, has realized the ultra-clean emission of final flue gas, can effectively retrieve the thermal energy of carbonaceous are useless admittedly simultaneously and sintering flue gas, has realized energy saving and consumption reduction.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

the utility model provides a pair of carbonaceous is useless burning utilization useless admittedly and is handled with sintering gas cleaning's coupled system includes sintering system and connection sintering gas cleaning processing system of sintering system, wherein, as the utility model discloses an improve, this coupled system still includes the useless burning utilization system of carbonaceous useless admittedly, the sintering gas that the useless burning utilization system of carbonaceous admittedly draws forth the end with the downstream end of sintering system is connected, the downstream end flue gas of the useless burning utilization system of carbonaceous admittedly converge mouthful with sintering gas cleaning processing system connects.

Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the sintering system includes a sintering machine, a sintering main flue of the sintering machine is sequentially connected with an electrostatic dust collector, a main exhaust fan and a sintering main flue valve along a flue gas flowing direction, and the sintering flue gas purification treatment system is connected to a downstream end of the sintering main flue valve.

Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the carbon-containing solid waste combustion utilization system includes a sintering flue gas leading-out flue connected to the sintering main flue, a sintering flue gas leading-out end of the sintering flue gas leading-out flue is arranged at a position between the main exhaust fan and the sintering main flue valve, the sintering flue gas leading-out flue is sequentially connected with a reaction furnace front valve, a front induced draft fan and a reaction furnace along a flue gas flowing direction, the reaction furnace is connected with a carbon-containing solid waste bin, a desulfurization reaction module and a denitration reaction module are integrated in the reaction furnace, a flue gas exhaust port of the reaction furnace is connected with a combustion back flue, the combustion back flue is connected with a heat collector, a flue gas converging port at a downstream end of the combustion back flue is connected at a position between the sintering main flue valve and the sintering flue gas purification treatment system, and a reaction furnace rear valve is arranged at the position of the combustion rear flue close to the flue gas confluence port at the downstream end of the combustion rear flue.

Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, along the flue gas flow direction of the flue gas after combustion, a reaction furnace dust remover and a rear induced draft fan are sequentially arranged at the downstream end of the heat collector of the flue gas after combustion.

Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the sintering flue gas purification treatment system includes a sintering desulfurization tower, a sintering denitrification device, a flue gas purification dust remover and a chimney, which are connected to the downstream end of the sintering main flue in sequence along the flue gas flowing direction of the sintering main flue.

The utility model discloses beneficial effect: 1. The zero emission of carbon-containing solid waste combustion by utilizing smoke pollution is realized, the two processes of sintering production and carbon-containing solid waste combustion are coupled, sintering smoke is used for supporting combustion in a reaction furnace, and partial desulfurization and denitration reactions are realized in the reaction furnace. The flue gas discharged from the reaction furnace enters the existing sintering flue gas purification treatment process for sintering production for secondary treatment after heat extraction and dust removal, so that the final ultra-clean emission of the flue gas is realized. In the whole process production process, no new smoke discharge point is added, and the combustion utilization of the carbon-containing solid waste and the zero emission of smoke pollution are realized from the viewpoint of the total emission.

2. Realizes the coupling of two processes of energy saving and consumption reduction, the combustion utilization of carbon-containing solid wastes and the purification treatment of sintering flue gas, and the CO in the sintering flue gas accounts for 1 percent of the chemical heat and accounts for 120 kJ/Nm³And can be effectively used. Meanwhile, the physical waste heat of the sintering flue gas at the temperature of 150 ℃ can be effectively recovered, and the energy consumption of effective unit heat extraction is reduced.

3. In the reaction furnace, the carbon-containing solid waste and the sintering flue gas are subjected to combustion reaction, and dioxin in the flue gas in the reaction furnace can be thoroughly decomposed, so that the emission of pollutants is further reduced.

Drawings

Fig. 1 is a schematic structural diagram of the coupling system of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, as shown in fig. 1, the utility model discloses a coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, which comprises a sintering system and a sintering flue gas purification treatment system connected with the sintering system. The coupling system further comprises a carbon-containing solid waste combustion utilization system, a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, and a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system.

Further, as shown in fig. 1, the sintering system includes a sintering machine 1, a main sintering flue 2 of the sintering machine 1 is connected with an electrostatic dust collector 3, a main exhaust fan 4 and a main sintering flue valve 15 in sequence along the flow direction of flue gas, and a sintering flue gas purification treatment system is connected at the downstream end of the main sintering flue valve 15.

Specifically, with continuing reference to fig. 1, the carbon-containing solid waste combustion utilization system includes a sintering flue gas outlet flue 5 connected to the sintering main flue 2, and a sintering flue gas outlet end of the sintering flue gas outlet flue 5 is arranged at a position of the sintering main flue 2 between the main draft fan 4 and the sintering main flue valve 15. The sintering flue gas leading-out flue 5 is sequentially connected with a reaction furnace front valve 6, a front induced draft fan 7 and a reaction furnace 8 along the flue gas flowing direction, and the reaction furnace 8 is connected with a carbon-containing solid waste bin 9. A desulfurization reaction module and a denitration reaction module are integrated in the reaction furnace 8, a flue gas outlet of the reaction furnace 8 is connected with a flue 10 after combustion, and a heat collector 11 is connected on the flue 10 after combustion. The downstream end flue gas confluence port of the post-combustion flue 10 is connected to the sintering main flue 2 at a position between the sintering main flue valve 15 and the sintering flue gas purification treatment system. In order to prevent the sintering flue gas in the main sintering flue 2 from flowing back to the post-combustion flue 10 from the post-combustion flue 10 near the flue gas confluence at the downstream end of the post-combustion flue 10, the post-combustion flue 10 is provided with a post-reactor valve 14 near the flue gas confluence at the downstream end of the post-combustion flue 10.

Further, in the preferred embodiment of the present invention, as shown in fig. 1, along the flue gas flowing direction of the flue gas duct 10, the flue gas duct 10 is provided with a reactor dust collector 12 and a rear induced draft fan 13 at the downstream end of the heat collector 11. The front draught fan 7 and the rear draught fan 13 are used as power sources for smoke flowing, the front draught fan 7 can lead out part or all of sintering smoke in the sintering main flue 2 to the sintering smoke leading-out flue 5 from the connecting position of the sintering main flue 2 and the sintering smoke leading-out flue 5 as combustion-supporting air, and then the combustion smoke is led into the reaction furnace 8 through the sintering smoke leading-out flue 5. The extraction amount of the sintering flue gas in the sintering main flue 2 can be controlled through the reaction furnace front valve 6 and the sintering main flue valve 15.

Further, in the preferred embodiment of the present invention, as shown in fig. 1, the sintering flue gas purification treatment system includes a sintering desulfurization tower 16, a sintering denitration device 17, a flue gas purification dust collector 18 and a chimney 19, which are connected to the downstream end of the sintering main flue 2 in sequence along the flue gas flowing direction of the sintering main flue 2.

The utility model discloses a work flow does: sintering flue gas generated by the sintering machine 1 enters a sintering main flue 2, part or all of the sintering flue gas is led out to a sintering flue gas leading-out flue 5 after passing through an electrostatic dust collector 3 and a main exhaust fan 4, and the led-out sintering flue gas enters a reaction furnace 8 through a reaction furnace front valve 6 and a front induced draft fan 7. The carbon-containing solid waste stored in the carbon-containing solid waste bin 9 also enters the reaction furnace 8. In the reaction furnace 8, the introduced sintering flue gas and the carbon-containing solid waste in the reaction furnace 8 are subjected to combustion reaction, and partial desulfurization and denitration reaction of the flue gas in the furnace is completed in the reaction furnace 8. Then, the flue gas discharged from the reaction furnace 8 enters a flue 10 after combustion, heat exchange is completed through a heat collector 11, and heat in the high-temperature flue gas is absorbed, so that the high-temperature flue gas is changed into low-temperature flue gas. The low temperature flue gas discharged from the heat remover 11 then enters the dust remover 12 of the reaction furnace for dust removal. Then through back draught fan 13, reaction furnace back valve 14, get back to in the sintering gas cleaning processing system that original sintering machine 1 was supporting again, the flue gas that converges to sintering gas cleaning processing system this moment is the flue gas after the combustion reaction in the reaction furnace 1, carbon monoxide content and dioxin content in this flue gas have all been reduced by a wide margin, and the flue gas accomplishes desulfurization, denitration, dust removal in proper order through sintering gas cleaning processing system's sintering desulfurizing tower 16, sintering denitrification facility 17, gas cleaning dust remover 18, discharge by chimney 19 at last. When all the sintering flue gas enters the reaction furnace 8, the sintering main flue valve 15 is completely closed, and the front valve 6 and the rear valve 14 of the reaction furnace are completely opened. When partial sintering flue gas is required to enter the reaction furnace 8, the flow regulation is realized by regulating the opening degrees of the sintering main flue valve 15, the reaction furnace front valve 6 and the reaction furnace rear valve 14. When all sintering flue gas needs to be treated by the original gas purification system, the sintering main flue valve 15 is completely opened, the front valve 6 of the reaction furnace and the rear valve 14 of the reaction furnace are completely closed, the coupling process and the coupling degree can be flexibly adjusted and controlled, the operation and the use are convenient, the equipment cost is low, and the coupling construction cost between the sintering production and the process and the equipment for burning and utilizing carbon-containing solid wastes is low.

For further description of the ultra-clean discharge process of the present invention, the following detailed description is made on the working principle:

the existing combustion utilization of carbon-containing solid wastes such as coal gangue, coal washing slurry and the like generally comprises the steps of entering a boiler for combustion to generate steam, and discharging flue gas after the flue gas is subjected to purification treatment such as desulfurization, denitration, dust removal and the like to reach an ultra-clean discharge standard. At present, the ultra-clean emission standard of the boiler flue gas of the power plant is executed, and the ultra-clean emission index of the boiler flue gas of the power plant is shown in the following table 1:

TABLE 1

Ordinal number	Parameters of	Single position	Numerical value
				1	Dust concentration	mg/Nm ³	10
2	SO₂Concentration of	mg/Nm³	35
				3	NO_XConcentration of	mg/Nm³	50

And (4) according to the emission standard, a large amount of pollutants in the flue gas generated after the carbon-containing solid waste is combusted and utilized are discharged into the atmosphere.

And the sintering flue gas generated by the existing steel production sintering process can realize ultra-clean emission after dust removal, desulfurization and denitration treatment. The standard of ultra-clean emission in the prior steel production sintering process is the same as the standard of ultra-clean emission of boiler flue gas in a power plant. In the current practical application, the two production modes are simultaneously carried out in parallel. Wherein, the pollutants discharged to the atmosphere by the flue gas after the carbon-containing solid waste is combusted are as follows: the smoke quantity after the carbon-containing solid waste is combusted is multiplied by the pollutant emission concentration percent. The pollutants discharged to the atmosphere by the sintering flue gas are as follows: the sintering flue gas amount is multiplied by the pollutant emission concentration%. The total amount of pollutants discharged to the atmosphere by the two production modes is as follows: the flue gas amount after the carbon-containing solid waste is combusted is multiplied by the pollutant emission concentration% + the sintering flue gas amount is multiplied by the pollutant emission concentration%.

And the utility model discloses a burning utilization and sintering gas cleaning of carbon-containing solid useless handles coupling process, just use whole or partial sintering flue gas as combustion-supporting wind, in the reacting furnace with coal slime, gangue etc. carbon-containing solid useless combustion reaction that takes place, shift the chemical energy that carbon-containing solid useless contains to the high temperature flue gas in, use the heat collector to retrieve the flue gas heat, realize the carbon-containing solid useless resource utilization. Meanwhile, in the reaction furnace 1 in which the desulfurization reaction module and the denitration reaction module are integrated, the desulfurization and denitration reactions are also accompanied during the combustion reaction. The flue gas out of the reaction furnace 1 is subjected to heat exchange through a heat collector 11, is dedusted through a reaction furnace deduster 12, then returns to the sintering main flue 2, and enters the sintering system to be subjected to secondary desulfurization, denitrification and dedusting treatment in the original sintering flue gas purification treatment system.

Because of the integrated desulfurization and denitration functions in the reaction furnace and the high-efficiency dust removal of the flue gas out of the reaction furnace through the reaction furnace dust remover 12, the contents of sulfur, nitrate and dust in the part of the flue gas which is converged again and enters the sintering main flue 2 are all lower than those in the original sintering flue gas. Therefore, after passing through the desulfurization, denitration and dust removal device equipped in the original sintering machine, the amount of sulfur, nitrate and dust in the flue gas discharged through the chimney 19 is lower than that of the original flue gas.

Further may be expressed as: the carbon-containing solid waste combustion utilization and the sintering flue gas purification treatment are coupled and linked, the sintering flue gas firstly completes the carbon-containing solid waste combustion utilization in the reaction furnace 1, and then converges and enters an original sintering flue gas purification treatment system of a sintering system for purification treatment. The two processes are coupled to the atmosphere and the pollutants are: the sintering flue gas amount is multiplied by the pollutant emission concentration%. Because the contents of sulfur, nitrate and dust in the flue gas which enters the sintering main flue again after passing through the reaction furnace 1 are all lower than the contents in the original sintering flue gas, the total emission is not increased, which is equivalent to zero emission of flue gas pollution in the combustion and utilization process of carbon-containing solid waste, and the content of carbon monoxide and the content of dioxin in the flue gas are greatly reduced.

Various other changes and modifications may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such changes and modifications should fall within the scope of the present invention.

Claims

1. The utility model provides a carbonaceous solid useless combustion utilization and sintering gas cleaning's coupled system, includes sintering system and connection sintering gas cleaning processing system of sintering system, its characterized in that: the device is characterized by further comprising a carbon-containing solid waste combustion utilization system, wherein a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, and a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system.

2. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes as claimed in claim 1, wherein: the sintering system comprises a sintering machine (1), a sintering main flue (2) of the sintering machine (1) is sequentially connected with an electrostatic dust collector (3), a main exhaust fan (4) and a sintering main flue valve (15) along the flowing direction of flue gas, and the sintering flue gas purification treatment system is connected with the downstream end of the sintering main flue valve (15).

3. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes as claimed in claim 2, wherein: carbon-containing solid useless burning utilization system is including connecting sintering flue gas on sintering flue (2) is drawn forth flue (5), and its sintering flue gas is drawn forth the end and is established sintering flue (2) is lieing in owner air exhauster (4) with position department between sintering flue valve (15), sintering flue gas is drawn forth flue (5) and is connected gradually reaction furnace front valve (6), preceding draught fan (7) and reacting furnace (8) along flue gas flow direction, reacting furnace (8) are connected with carbon-containing solid useless storehouse (9), it has desulfurization reaction module and denitration reaction module to integrate in reacting furnace (8), the flue gas discharge port of reacting furnace (8) is connected with back flue (10) of burning, be connected with on back flue (10) and get heater (11), the downstream end flue gas convergent flow mouth of back flue (10) of burning is connected sintering flue (2) is lieing in sintering flue valve (15) with sintering flue And a reaction furnace rear valve (14) is arranged at the position between the flue gas purification treatment systems and close to the downstream end flue gas confluence opening of the combustion flue (10).

4. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes as claimed in claim 3, wherein: along the flue gas flow direction of flue (10) behind the burning, flue (10) behind the burning is located the downstream end of calorimeter (11) is equipped with reacting furnace dust remover (12) and back draught fan (13) in proper order.

5. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes as claimed in claim 2, wherein: the sintering flue gas purification treatment system comprises a sintering desulfurization tower (16), a sintering denitration device (17), a flue gas purification dust remover (18) and a chimney (19) which are sequentially connected to the downstream end of the sintering main flue (2) along the flue gas flowing direction of the sintering main flue (2).