CN214345084U - Sintering flue gas circulation is united desulfurization dust removal denitration integrated device - Google Patents
Sintering flue gas circulation is united desulfurization dust removal denitration integrated device Download PDFInfo
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- CN214345084U CN214345084U CN202022834169.0U CN202022834169U CN214345084U CN 214345084 U CN214345084 U CN 214345084U CN 202022834169 U CN202022834169 U CN 202022834169U CN 214345084 U CN214345084 U CN 214345084U
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Abstract
The utility model provides a desulfurization dust removal denitration integrated device is united in sintering flue gas circulation, sintering flue gas are the flue gas that the sintering machine produced, and the sintering machine has the aircraft nose main flue of the first flue gas of discharging all the way, the well anterior segment main flue of the second way flue gas of discharging and the well back end main flue of the third way flue gas of discharging, include: the gas-gas heat exchanger is used for exchanging heat between the second path of flue gas and the third path of flue gas; desulfurization dust removal denitrification facility, first flue gas of the same kind with the process the third route flue gas after the gas heat exchanger heat transfer mixes the back and passes through desulfurization dust removal denitrification facility carries out desulfurization treatment, dust removal treatment and denitration treatment, the technical scheme of the utility model greatly saved investment, running cost, practiced thrift area, fundamentally has solved dust removal function and denitration function life and inconsistent problem, has effectively prolonged the live time, has saved the maintenance cost, but the too reasonable mode resourceful reuse avoids polluting and extravagant.
Description
Technical Field
The utility model relates to a flue gas treatment technical field, in particular to sintering flue gas circulation unites desulfurization dust removal denitration integrated device.
Background
The discharge amount of pollutants in a sintering process in the steel industry is large, a sintering flue gas circulation technology is taken as an important mode for reducing the discharge amount of the pollutants, and various circulation processes are proposed at home and abroad, wherein the processes such as LEEP, Eposint, EOS, new-day iron and the like are available at home and abroad; domestic enterprises such as Ning steel, sand steel, first steel stock, Bao steel, permanent steel, migrating steel, long steel and the like are respectively implemented.
The current flue gas circulation technology of sintering machines is roughly divided into two technical genres: the flue gas internal circulation technology and the flue gas external circulation technology.
The flue gas internal circulation technology is characterized in that: 1. considering the smoke pollutants and the temperature distribution characteristics of each air box of the sintering machine, the pollutants can generate a series of complex chemical reaction processes in a sintering material layer, including secondary combustion heat release of CO, high-temperature decomposition of dioxin and the like, SO that SO can be theoretically reduced2、NOxEtc. of other pollutants. However, according to the practical performance, the sintering process is accompanied by numerous physical and chemical reactions, the process is very complicated,the internal circulation does not achieve the desired effect and also brings about some other problems. 2. Air is taken from the air box branch pipes, the operation is flexible, and different air boxes can be switched randomly to enter the flue gas circulation system. However, the engineering quantities of equipment, steel structures, civil engineering, valve instruments and the like are large, so that the investment is high and the overhaul workload is large. 3. Compared with the external circulation process, the internal circulation process has the advantages of high temperature and high oxygen content of the circulating flue gas, high flue gas circulation rate (about 30 percent) and good flue gas waste heat utilization effect.
The flue gas external circulation technology is characterized in that: 1. flue gas is taken from a flue behind the sintering main exhaust fan, so that the engineering change is small, and the fixed investment is low. Therefore, the flue gas circulating system is better than a flue gas internal circulating system in the aspect of popularization degree in the industry; 2. the process flow is simple, the number of valves and meters is small, and the overhaul workload is small; 3. because the temperature of the flue gas after sintering the main exhaust fan is low (generally between 130 ℃ and 150 ℃), the heat utilization effect is general; the oxygen content of the flue gas is relatively low, so that the emission reduction rate of the sintering flue gas is low (about 30 percent).
It can be said that the flue gas internal circulation technology and the flue gas external circulation technology have respective advantages and disadvantages.
In addition, as the flue gas circulation technology is increasingly applied to the treatment of sintering flue gas pollutants, people pay more and more attention to the technology, but the prior art usually adopts a series mode of flue gas circulation, desulfurization, dedusting and denitration, so that the investment and the operation cost of the whole project are very high, the occupied area is very large, the construction period is very long, great pressure is caused to enterprises, and the popularization and the application of the new technology are not facilitated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sintering flue gas circulation unites desulfurization dust removal denitration integrated device has realized extension fixture's life, reduction in production cost.
In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a sintering flue gas circulation is desulfurization dust removal denitration integrated device jointly, sintering flue gas refer to the flue gas that the sintering machine produced, and the sintering machine has the aircraft nose main flue of the first way flue gas of discharge, the well anterior segment main flue of the second way flue gas of discharge and the well back end main flue of the third way flue gas of discharge, includes: the gas-gas heat exchanger is used for exchanging heat between the second path of flue gas and the third path of flue gas; the first path of flue gas is mixed with the third path of flue gas subjected to heat exchange by the gas-gas heat exchanger, and then is subjected to desulfurization treatment, dust removal treatment and denitration treatment by the desulfurization, dust removal and denitration device; the smoke discharging equipment is used for discharging a part of the smoke treated by the desulfurization, dedusting and denitration device; the combustion furnace is used for heating the second path of flue gas after heat exchange of the gas-gas heat exchanger; and the other part of the flue gas treated by the desulfurization, dedusting and denitration device and the second path of flue gas heated by the combustion furnace are mixed by the flue gas mixer and then discharged into the sintering machine.
The flue gas mixer further comprises a circular cooler, wherein the circular cooler can discharge flue gas, and the flue gas discharged by the circular cooler is sent into the flue gas mixer; the desulfurization, dust removal and denitration device comprises a desulfurization reaction device and a dust removal and denitration device; the dust removal and denitration device comprises a back flushing device, a plurality of dust removal and denitration units, an ash hopper, an assembly plate and a box body; the assembly plate is arranged in the box body and divides the box body into an upper box body and a lower box body, a plurality of assembly holes are formed in the assembly plate, the upper end of the dust removal and denitration unit is an air outlet end and extends into the upper box body from the assembly holes, a blowing port of the back blowing device faces the air outlet end of the dust removal and denitration unit, the ash hopper is connected with the lower end of the lower box body, the lower end of the lower box body is open, and the ash hopper is communicated with the lower box body; a denitration smoke inlet is formed in the lower box body, a denitration smoke outlet is formed in the upper box body, the denitration smoke outlet is communicated with the smoke exhaust equipment through a smoke exhaust flue, a third fan is arranged on the smoke exhaust flue, and a second CEMS analyzer is arranged on the smoke exhaust flue and between the third fan and the smoke exhaust equipment; the plurality of dust removal denitration units are vertically arranged in the box body, and are parallel to each other.
Further, the device also comprises a denitration catalyst layer and a second ammonia injection grid; the denitration catalyst layer is arranged in the upper box body and is positioned below the denitration exhaust port, the second ammonia injection grid is arranged between the back blowing device and the denitration catalyst layer, the second ammonia injection grid is used for providing a reducing agent for the denitration reaction of the second denitration unit, and the nozzle of the second ammonia injection grid faces the dedusting and denitration unit; and a fourth CEMS analyzer is arranged on the side wall of the upper box body and positioned between the second ammonia injection grid and the back blowing device.
Further, the desulfurization reaction device comprises a desulfurization coiled pipe, a first desulfurizer spraying inlet and a second desulfurizer spraying inlet which are vertically arranged, the desulfurization coiled pipe at least comprises a lower part bend and an upper part bend, one end of the desulfurization coiled pipe is provided with a desulfurization flue gas inlet, the other end of the desulfurization coiled pipe is provided with a desulfurization flue gas outlet, the first path of flue gas and the third path of flue gas after heat exchange of the gas-gas heat exchanger enter the desulfurization coiled pipe through the desulfurization flue gas inlet, the first desulfurizer spraying port is arranged on the desulfurized flue gas inlet, the second desulfurizer spraying port is arranged at the lower bending part, and a third CEMS analyzer is arranged on the desulfurization coiled pipe and is positioned between the desulfurization flue gas inlet and the second desulfurizer spraying inlet, and the desulfurization flue gas outlet is communicated with the denitration flue gas inlet.
The device comprises an ash bucket, a plurality of desulfurized ash circulating devices, a compressed air storage tank and a desulfurized ash sampling port, wherein each desulfurized ash circulating device is connected with one ash bucket and comprises a bin pump, a compressed air storage tank and a desulfurized ash sampling port; on the secondary desulfurizer pipeline and be located desulfurization ash sample connection with department is equipped with first valve between the first desulfurizer mouth of spouting the mouth be equipped with the second valve on the secondary desulfurizer pipeline and be located first valve with department is connected with the ash storehouse branch pipe between the desulfurization ash sample connection be equipped with the second valve on the ash storehouse branch pipe, open the second valve can with desulfurization ash in the storehouse pump passes through the ash storehouse branch pipe is sent into to the ash storehouse.
Further, still include the ammonia supply system, the ammonia injection subsystem includes: first ammonia injection grid, controlling means and ammonia making device, the ammonia making device through first ammonia pipeline with first ammonia injection grid intercommunication, the ammonia making device through the second ammonia pipeline with second ammonia injection grid intercommunication, controlling means is used for control ammonia making device system ammonia, be equipped with the sixth valve on the first ammonia pipeline, first ammonia injection grid is located and is close on the desulfurization coiled pipe the department of buckling of upper portion.
Furthermore, the combustion furnace is a built-in combustion furnace, the middle-front section main flue is communicated with the combustion furnace through a middle-front section smoke exhaust flue, the combustion furnace is communicated with the smoke mixer through a combustion flue, a second fan is arranged on the combustion flue, one end of a combustion-supporting flue is connected to the position, located between the combustion furnace and the second fan, on the combustion flue, the other end of the combustion-supporting flue is communicated with the combustion furnace, and a first fan is arranged on the combustion-supporting flue; the device also comprises two CO concentration analyzers, wherein one CO concentration analyzer is arranged on the middle front section smoke exhaust flue and is positioned between the gas-gas heat exchanger and the combustion furnace, and the other CO concentration analyzer is arranged on the combustion flue and is positioned between the combustion-supporting flue and the combustion furnace.
Further, the device also comprises an oxygen supplementing device, an ammonia spraying device, a smoke sealing cover and a circulating smoke main pipe; the flue gas sealing cover is arranged on the sintering machine, the flue gas mixer is communicated with one end of the circulating flue gas main pipe, the upper end of the flue gas sealing cover is connected with one end of a circulating flue gas branch pipe, and the other end of the circulating flue gas branch pipe is connected with the circulating flue gas main pipe; the oxygen supplementing device comprises an oxygen buffer tank and an oxygen distributor, the oxygen buffer tank is provided with an oxygen inlet and an oxygen outlet, the input end of the oxygen distributor is communicated with the oxygen outlet, the output end of the oxygen distributor is arranged on the main circulating flue gas pipe and is positioned between the branch circulating flue gas pipe and the flue gas mixer, and the ammonia spraying device is arranged on the main circulating flue gas pipe and is positioned between the oxygen distributor and the flue gas mixer; the circulating flue gas branch pipe is provided with a regulating valve, the upper end of the flue gas sealing cover is provided with a pressure detection device and an oxygen concentration analyzer, the pressure detection device is used for monitoring the internal pressure of the flue gas sealing cover, and the oxygen concentration analyzer is used for monitoring the oxygen concentration in the flue gas sealing cover.
Further, dust removal denitration cell cube includes dust bag, dust bag outside-in has set gradually dust layer, base cloth layer dust bag's inside has set gradually bag cage and honeycomb activated carbon pipe, the inner chamber of honeycomb activated carbon pipe is clean flue gas passageway, the sintering flue gas by dust bag's outside is via after dust bag and honeycomb activated carbon pipe in proper order clean flue gas passageway gets into in the upper box body, dust bag's upper end is connected with the connecting pipe, the sintering flue gas by clean flue gas passageway gets into and discharges in the connecting pipe, the connecting pipe is hollow round platform structure, the tip of connecting pipe with dust bag's upper end is connected, the tip of connecting pipe is provided with outside protruding edge, protruding edge is located in the upper box body.
The desulfurization flue gas inlet is communicated with the outer exhaust flue, the machine head main flue is communicated with the outer exhaust flue through a machine head smoke exhaust flue, one end of a middle front section branch flue is communicated with the middle front section smoke exhaust flue, the other end of the middle front section branch flue is communicated with the outer exhaust flue, the middle rear section main flue is communicated with the outer exhaust flue through a middle rear section smoke exhaust flue, a first CEMS analyzer is arranged on the outer exhaust flue and close to the desulfurization flue gas inlet, a fourth valve is arranged on the middle front section branch flue, and a fifth valve is arranged on the middle front section smoke exhaust flue before entering the gas-gas heat exchanger; an external circulation flue is communicated with the position, which is positioned on the flue gas discharge flue and between the third fan and the desulfurization, dedusting and denitration device, the other part of the flue gas treated by the desulfurization, dedusting and denitration device is sent into the flue gas mixer through the external circulation flue, and a third valve is arranged on the external circulation flue; the circular cooler is communicated with the flue gas mixer through a circular cooling flue.
The analysis can know, the utility model discloses a sintering flue gas circulation unites desulfurization dust removal denitration integrated device, the technical scheme of the utility model greatly saved investment, running cost, practice thrift area, fundamentally has solved dust removal function and denitration function life inconsistent problem, has effectively prolonged the live time, has saved the maintenance cost, but cross reasonable mode resourceization reuse, avoids polluting and extravagant.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of a sintering flue gas circulation combined desulfurization, dust removal and denitration integrated device according to an embodiment of the present invention.
Fig. 2 the utility model discloses a sintering flue gas circulation is combined desulfurization dust removal denitration device's of desulfurization dust removal denitration integrated device's of embodiment's structural schematic.
Fig. 3 is a schematic structural diagram of a dust removal and denitration unit of a sintering flue gas circulation combined desulfurization, dust removal and denitration integrated device according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view at a-a of fig. 3.
Fig. 5 is a cross-sectional view at B-B of the bitmap 3.
Description of reference numerals: 1-sintering machine; 2-flue gas sealing cover; 3-a pressure detection device; 4-oxygen concentration analyzer; 5-adjusting the valve; 6-oxygen uniform distributor; 7-an oxygen buffer tank; 8-an ammonia injection system; 9-flue gas mixer; 10-a fourth valve; 11-a fifth valve; 12-gas heat exchanger; 13-CO concentration analyzer; 14-a combustion furnace; 15-a first fan; 16-a second fan; 17-circular cooler; 18-a first CEMS analyzer; 19-a desulfurization, dust removal and denitration device; 20-a third valve; 21-a third fan; 22-a second CEMS analyzer; 23-a fume extractor; 24-machine head smoke exhaust flue; 25-middle front section smoke exhaust flue; 26-middle and rear section smoke exhaust flues; 27-an outer discharge flue; 28-external circulation flue; 29-ring cooling flue; 30-machine head main flue; 31-middle front section main flue; 32-middle and rear section main flues; 33-combustion-supporting flue; 34-a first desulfurizer spray inlet; 35-a desulfurization reaction device; 36-third CEMS analyzer; 37-a second desulfurizer spray inlet; 38-ash bucket; 39-a dust removal and denitration device; 40-a dedusting and denitration unit; 401-a dusting layer; 402-a scrim layer; 403-bag cage; 404-honeycomb activated carbon tube; 405-clean flue gas channel; 41-a back flushing device; 42-fourth CEMS analyzer; 43-a second ammonia injection grid; 44-a denitration catalyst layer; 45-mounting the box body; 46-a sump pump; 47-compressed air pipes; 48-compressed air storage tank; 49-desulfurized fly ash sampling port; 50-a second valve; 51-a first valve; 52-secondary desulfurizer pipeline; 53-a first ammonia gas conduit; 54-a second ammonia gas conduit; 55-a control device; 56-sixth valve; 57-an ammonia plant; 58-first ammonia injection grid; 59-middle front section branch flue; 60-connecting pipe.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," "third," and "fourth" may be used interchangeably to distinguish one component from another and are not intended to denote the position or importance of the individual components.
As shown in fig. 1 to 5, according to the embodiment of the utility model, a sintering flue gas circulation combined desulfurization, dust removal and denitration integrated device is provided, sintering flue gas refers to the flue gas that the sintering machine produced, sintering machine 1 has the aircraft nose main flue 30 of the flue gas of the first way of discharge, the well anterior segment main flue 31 of the flue gas of second way of discharge and the well back end main flue 32 of the flue gas of third way of discharge, aircraft nose main flue 30, well anterior segment main flue 31 and well back end main flue 32 divide according to the size of gaseous pollutant concentration in the sintering flue gas bellows (can be to bellows serial number 1, 2 … …) branch pipe. Although the sintering machine 1 is large and small in scale (large may be 500 m)2Small possible only 90m2) However, along the running direction of the sintering machine trolley, the concentration change of gaseous pollutants in the air box branch pipe has a certain rule. Therefore, the utility model discloses in divide the bellows flue gas into three routes, 1# -3# bellows first way flue gas, 4# -13# bellows second way flue gas, 14# -22# bellows second way flue gas. IntegrationThe device comprises: the gas-gas heat exchanger 12 is used for exchanging heat between the second path of flue gas and the third path of flue gas by the gas-gas heat exchanger 12; the first path of flue gas and the third path of flue gas after heat exchange by the gas-gas heat exchanger 12 are mixed and then are subjected to desulfurization treatment, dust removal treatment and denitration treatment by the desulfurization, dust removal and denitration device 19; a smoke discharging device 23, through which a part of the smoke treated by the desulfurization, dedusting and denitration device 19 is discharged; the combustion furnace 14 is used for simultaneously decomposing part of dioxin in the flue gas and heating the second path of flue gas at high combustion temperature by combusting combustible components such as CO in the coal gas and the second path of flue gas; the circular cooler 17 is characterized by being clean, high in oxygen content and high in temperature, and is very beneficial to improving the temperature and the oxygen content of the flue gas after the flue gas mixer, so that the sintering process is promoted; the other part of the flue gas treated by the desulfurization, dedusting and denitration device 19, the second flue gas heated by the combustion furnace 14 and the flue gas discharged by the annular cooler 17 of the flue gas mixer 9 are mixed by the flue gas mixer 9 and then discharged into the sintering machine 1.
High CO and NO content in the sintering machine 1xThe flue gas is led out from the corresponding flue and is called as a second path of flue gas as a cold medium; leading out the middle-rear section flue gas from the corresponding flue, and taking the flue gas as a third flue gas path as a heat medium; the machine head smoke is led out from the corresponding flue and is called as first path smoke. After the second path of flue gas and the third path of flue gas exchange heat through the gas-gas heat exchanger 12, the temperature of the second path of flue gas is increased from 100 ℃ to about 180 ℃, and the temperature of the third path of flue gas is reduced from 280 ℃ to about 200 ℃, so that the heat of the high-temperature flue gas is effectively utilized. Then, the second path of flue gas passes through the combustion furnace 14 and the flue gas mixer 9 in sequence and returns to the sintering machine 1. In order to ensure that the sintering machine 1 can still normally operate during the overhaul period of the sintering flue gas circulation system, the second flue gas is divided into a bypass flue (a middle front branch flue 59) on the middle front smoke exhaust flue 25 to be merged with the first flue gas, and the fourth valve 10 is used for controlling. Before the sintering flue gas circulating system is overhauled, the fourth valve 10 is opened in advance, and the fifth valve 11 is closed.
The common heating furnace is in the flueThe heating furnace is arranged around, the coal gas generates high-temperature gas after being combusted in the heating furnace, and then the high-temperature gas enters the flue to be mixed with the flue gas coming from the upstream so as to achieve the purpose of heating the flue gas. In the built-in combustion furnace system, an igniter, a combustion-supporting flue and a gas pipeline are all inserted into the flue, and ignition and combustion are carried out in the flue to heat flue gas. The igniter may be plasma ignited or other ignition means. The built-in combustion furnace system has three advantages: 1) the coal gas is combusted in the flue, and compared with combustion in a hearth outside the flue, the heat dissipation of combustion can be greatly reduced; 2) the average concentration of CO in the second path of flue gas is 10000mg/m3While the average CO concentration in the windboxes of the sintering machine 1 was only 5300mg/m3. The central temperature of gas combustion is about 1200 ℃, CO in the second path of flue gas can be easily ignited, so that CO is combusted to release heat, on one hand, high-concentration CO in the flue gas is ignited, a large amount of heat is released, the temperature of circulating flue gas is favorably improved, and the utilization rate of the waste heat of the flue gas is improved; meanwhile, the emission concentration of CO is reduced, and waste is changed into valuable. It is estimated that the CO concentration can be reduced by about 20%. This process is called first CO removal. 3) The dioxin is utilized to carry out combustion reaction in the gas combustion center, and part of the dioxin can also be removed. The high-temperature flue gas after combustion of the built-in combustion furnace is divided into two paths, and one path of the high-temperature flue gas is led back to the built-in combustion furnace from a combustion-supporting flue 33 of the combustion furnace 14 and is used for combustion-supporting of the coal gas; the other path is introduced into a combustion flue through a second fan 16, passes through a flue gas mixer 9, an ammonia spraying device 8, an oxygen supplementing device (comprising an oxygen buffer tank 7, an oxygen distributor 6 and an oxygen supply pipeline) and the like in sequence, and is divided into a plurality of branches to enter the flue gas sealing cover 2. The flue gas enters the sinter bed and participates in the sintering process again. The first path of flue gas and the third path of flue gas which is subjected to heat exchange and temperature reduction by the gas-gas heat exchanger 12 sequentially pass through the desulfurization, dedusting and denitration integrated device and the third fan 21, and then enter the smoke exhaust device for discharging, wherein the smoke exhaust device is preferably a chimney. A path of flue gas is branched out before the third fan 21, and the externally circulated flue gas is conveyed to the inlet of the flue gas mixer 9 through the externally circulated flue 28. Because the flue gas of the circular cooler 17 has the characteristics of low dust concentration and high oxygen content (about 21 percent), the first section and the second section of circular cooling flue gas are generally used for waste heat power generation, and the third section of circular cooling flue gas has the temperature of about 200 ℃ and can be used for supplementing oxygen to the flue gas in the external circulation flue 28. This portion of the flue gas is therefore sent to the inlet of the flue gas mixer 9 through the annular cooling flue 29. And the CO concentration analyzer 13 and the second CEMS analyzer 22 which are arranged in the system are used for testing pollutant components in the smoke, and the operation parameters of the system are adjusted according to the test result so as to prevent the concentration of the smoke pollutants at the outlet of the smoke exhaust device from exceeding the standard.
Preferably, the desulfurization, dust removal and denitration device 19 comprises a desulfurization reaction device and a dust removal and denitration device 39; the dust removal and denitration device 39 comprises a blowback device 41, a plurality of dust removal and denitration units 40, an ash bucket 38, an assembly plate and a box body; the dust removal and denitration units 40 are all arranged in the box body, the assembly plate is arranged in the box body and divides the box body into an upper box body 45 and a lower box body, a plurality of assembly holes are formed in the assembly plate, the upper end of each dust removal and denitration unit 40 is an air outlet end and extends into the upper box body 45 from the assembly hole, the air blowing port of the back blowing device 41 faces the air outlet end of each dust removal and denitration unit 40, the ash bucket 38 is connected with the lower end of the lower box body, the lower end of the lower box body is open, and the ash bucket 38 is communicated with the lower box body; the lower box body is provided with a denitration smoke inlet, the upper box body 45 is provided with a denitration smoke outlet, the denitration smoke outlet is communicated with the smoke exhaust equipment 23 through a smoke exhaust flue, the smoke exhaust flue is provided with a third fan 21, a second CEMS analyzer 22 is arranged on the smoke exhaust flue and between the third fan 21 and the smoke exhaust equipment 23, the dust removal and denitration units 40 are parallel to each other, and the CEMS analyzer is a device for continuously monitoring the concentration and the total emission amount of gaseous pollutants and particulate matters emitted by an air pollution source and transmitting information to a main department in real time.
Preferably, a denitration catalyst layer 44 and a second ammonia injection grid 43 are further included; denitration catalyst layer 44 is located in last box 45 and is located the below of denitration exhaust port, second ammonia injection grid 43 is located between blowback device 41 and denitration catalyst layer 44, second ammonia injection grid 43 is used for providing reductant (ammonia source) for the denitration reaction of denitration catalyst layer 44, and the spout of second ammonia injection grid 43 is towards dust removal denitration unit 40, be used for spouting the ammonia source before the flue gas process reaches second denitration unit (denitration catalyst layer 44), spout reductant (ammonia source) in the flue gas of preferred export to dust removal denitration unit 40, be provided with fourth CEMS analysis appearance 42 on the lateral wall of last box 45 and be located the position department between second ammonia injection grid 43 and blowback device 41, a plurality of dust removal denitration unit 40 are vertical to be set up in the box.
Preferably, the desulfurization reaction device 35 comprises a desulfurization coiled pipe, a first desulfurizer spray inlet 34 and a second desulfurizer spray inlet 37 which are vertically arranged, the desulfurization coiled pipe at least comprises a lower bending part and an upper bending part, one end of the desulfurization coiled pipe is provided with a desulfurization flue gas inlet, the other end of the desulfurization coiled pipe is provided with a desulfurization flue gas outlet, the first flue gas and the third flue gas after heat exchange by the gas-gas heat exchanger 12 enter the desulfurization coiled pipe through the desulfurization flue gas inlet, the first desulfurizer spray inlet 34 is arranged on the desulfurization flue gas inlet, the second desulfurizer spray inlet 37 is arranged on the lower bending part, the desulfurization coiled pipe is provided with a third CEMS analyzer, the third CEMS analyzer is positioned between the desulfurization flue gas inlet and the second desulfurizer spray inlet 37, the desulfurization flue gas outlet is communicated with the denitration flue gas inlet, the desulfurization coiled pipe is an S-shaped flue, and the S-shaped flue is composed of a plurality of branches vertical to the horizontal plane, the adjacent branches are connected through bending (bending) pipes, so that an S-shaped channel is formed, the desulfurization flue gas inlet is parallel to the horizontal plane, and flue gas enters the desulfurization flue gas inlet, passes through each branch pipe in sequence and is finally discharged from the desulfurization flue gas outlet to the dedusting and denitration device 39.
The flue gas entering the desulfurization, dust removal and denitration device 19 is introduced into the top of the desulfurization reaction device 35 through the outer exhaust flue 27 and then enters the left flue of the desulfurization reaction device 35. The desulfurization reaction device 35 is a flue gas-carrying reactor with a special structure, and the desulfurization reaction device 35 is designed by a special distribution flow field and ensures sufficient retention time of flue gas, thereby enhancing the sodium bicarbonate desulfurizer and flue gas such as HCl, HF and SO2A strong reaction between them.
The desulfurizer enters the desulfurization reaction device 35 in two paths, namely a first desulfurizer spraying port 34 and a second desulfurizer spraying port 37, the first desulfurizer spraying port 34 sprays desulfurization ash to enable the flue gas to perform a first desulfurization reaction, and the second desulfurizer spraying port 37 sprays fresh desulfurizer to enable the flue gas to perform a second desulfurization reaction. The desulphurized ash spraying inlet is arranged in front of the fresh desulphurizing agent inlet, and the aim is to ensure that the high-concentration S in the raw flue gasO2Firstly, the sulfur-containing gas is contacted with desulfurized fly ash to remove a part of SO2Then part of the desulfurized flue gas is contacted with a fresh desulfurizer, which is beneficial to increasing SO2And (4) removing efficiency. Wherein the desulfurization ash contains effective desulfurization components mainly comprising Na2CO3About 20-30% by mass; the effective desulfurization component of the fresh desulfurizer is mainly NaHCO3The mass percentage is more than about 99.8 percent. And adjusting the sprayed amount of the desulfurization ash and the desulfurizer in time according to the test data of the first CEMS analyzer 18, the second CEMS analyzer 22 and the third CEMS analyzer 36. The desulfurized ash and fresh desulfurizing agent are sprayed into flue gas, NaHCO3Is instantaneously decomposed into countless high-activity and high-porosity Na2CO3Particles of Na2CO3SO in particles and flue gas2A rapid desulfation chemical reaction occurs, and 75-80% of the desulfation reaction is completed at this stage. The above desulfurization reaction performed in the desulfurization reaction device 35 is a first desulfurization reaction.
Preferably, the desulfurization device also comprises a plurality of desulfurization ash circulating devices, each desulfurization ash circulating device is connected with one ash bucket 38, the desulfurization ash circulates back to the desulfurization reaction device 35 and comprises a bin pump 46, a compressed air storage tank 48 and a desulfurization ash sampling port 49, a feed inlet of the bin pump 46 is communicated with the bottom end of the ash bucket 38, the compressed air storage tank 48 is communicated with the bin pump 46 through a compressed air pipeline 47, a discharge outlet of the bin pump 46 is communicated with the first desulfurizer spraying port 34 through a secondary desulfurizer pipeline 52, and the desulfurization ash sampling port 49 is arranged on the secondary desulfurizer pipeline 52 and close to the bin pump 46;
preferably, a first valve 51 is arranged on the secondary desulfurizer pipeline 52 and between the desulfurized ash sampling port 49 and the first desulfurizer spraying port 34, an ash storage branch pipe is connected on the secondary desulfurizer pipeline 52 and between the first valve 51 and the desulfurized ash sampling port 49, a second valve 50 is arranged on the ash storage branch pipe, and the desulfurized ash in the bin pump 46 can be sent into the ash storage through the ash storage branch pipe by opening the second valve 50.
Preferably, an ammonia supply system is further included, the ammonia supply system comprising: the ammonia production device comprises a first ammonia injection grid 58, a control device 55 and an ammonia production device 57, wherein the ammonia production device 57 is communicated with the first ammonia injection grid 58 through a first ammonia pipeline 53, the ammonia production device 57 is communicated with a second ammonia injection grid 43 through a second ammonia pipeline 54, the control device 55 is used for controlling the ammonia production device 57 to produce ammonia, the first ammonia pipeline 53 is provided with a sixth valve 20, and the first ammonia injection grid 58 is arranged on a desulfurization coiled pipe and is close to the upper bending part.
In the flue before the dust removal and denitration device 39, the flue gas after the first-step desulfurization reaction is fully mixed with the ammonia gas injected by the first ammonia injection grid 58, and enters the dust removal and denitration device 39 together. In the device, the flue gas loops through the dust removal layer 401 of dust removal filter bag, because the dust removal layer 401 is more compact, therefore most dust can be got rid of to the dust removal filter bag, through blowback device 41, makes the dust on the dust removal filter bag surface fall into below dust hopper 38. The filter cake formed on the surface of the dust-removing filter bag mainly comprises a desulfurization reaction product, unreacted desulfurizer and fly ash, and residual SO in the flue gas2The adsorption on the filter cake is carried out with desulfurization reaction, which is called second-step desulfurization reaction, and usually 15-20% of pollutants are reacted in the bag-type dust remover. By making the raw flue gas have high SO concentration2Firstly, the sulfur-containing material reacts with desulfurized fly ash to remove a part of SO2Then unreacted low concentration SO2Then reacts with fresh desulfurizer, which is beneficial to increasing SO2The overall removal efficiency.
The lower part of the dedusting and denitration device 39 is provided with a plurality of ash hoppers 38 which are matched with an ash conveying device. In order to fully utilize the unreacted Na in the desulfurized fly ash2CO3And 2-4 desulfurization ash circulating devices corresponding to the tail part of the dust removal and denitration device 39 are repeatedly used. The desulfurization ash circulating device comprises a compressed air storage tank 48, a compressed air pipeline 47, a desulfurization ash sampling port 49, a first valve 51, a second valve 50 and the like. The desulfurized fly ash is taken out from a desulfurized fly ash sampling port 49 and Na is detected2CO3In an amount of Na2CO3When the content is higher than 20-25%, the first valve 51 is opened, the second valve 50 is closed, and the desulfurized ash is recycled to the inlet of the secondary desulfurizing agent for recycling. If Na is present2CO3If the content is less than 20-25%, the first valve 51 is closed, the second valve 50 is opened, and if the desulfurized ash cannot be recycled, the desulfurized ash is sent to an ash storage. Power of desulfurized fly ash circulating deviceThe source is compressed air released from a compressed air storage tank 48.
Preferably, the middle front section main flue 31 is communicated with the combustion furnace 14 through the middle front section smoke exhaust flue 25, the combustion furnace 14 is communicated with the smoke mixer 9 through the combustion flue, the second fan 16 is arranged on the combustion flue, one end of a combustion-supporting flue 33 is connected to the position, between the combustion furnace 14 and the second fan 16, on the combustion flue, the other end of the combustion-supporting flue 33 is communicated with the combustion furnace 14, and the first fan 15 is arranged on the combustion-supporting flue 33; and the system also comprises two CO concentration analyzers 13, wherein one CO concentration analyzer 13 is arranged on the middle front section smoke exhaust flue 25 and is positioned between the gas-gas heat exchanger 12 and the combustion furnace 14, and the other CO concentration analyzer 13 is arranged on the combustion flue and is positioned between the combustion-supporting flue 33 and the combustion furnace 14.
Preferably, the system also comprises an oxygen supplementing device, an ammonia spraying device 8, a flue gas sealing cover 2 and a circulating flue gas main pipe; the flue gas sealing cover 2 is arranged on the sintering machine 1, the flue gas mixer 9 is connected with one end of a main circulating flue gas pipe, the upper end of the flue gas sealing cover 2 is connected with one end of a branch circulating flue gas pipe, and the other end of the branch circulating flue gas pipe is communicated with the main circulating flue gas pipe; the oxygen supplementing device comprises an oxygen buffer tank 7 and an oxygen distributor 6, the oxygen buffer tank 7 is provided with an oxygen inlet and an oxygen outlet, the input end of the oxygen distributor 6 is communicated with the oxygen outlet, the output end of the oxygen distributor 6 is arranged on the main circulating flue gas pipe and is positioned between the branch circulating flue gas pipe and the flue gas mixer 9, and the ammonia spraying device 8 is arranged on the main circulating flue gas pipe and is positioned between the oxygen distributor 6 and the flue gas mixer 9; be equipped with governing valve 5 on the circulation flue gas branch pipe, the upper end of sealed cowling of flue gas 2 is equipped with pressure measurement device 3 and oxygen concentration analysis appearance 4, and pressure measurement device 3 is used for monitoring sealed cowling of flue gas 2's internal pressure, and oxygen concentration analysis appearance 4 is used for monitoring the oxygen concentration in the sealed cowling of flue gas 2.
The ammonia spraying device 8 is used for supplementing NH to the main pipe of the circulating flue gas3To make NO containedxThe flue gas reacts with NH in the sinter bed3SNCR (Selective non-catalytic reduction) reaction occurs to remove NOx. The temperature range of SNCR (selective non-catalytic reduction) denitration reaction is 900-1100 ℃, is consistent with the temperature of a sintered ore bed (1000-1100 ℃), and has a reaction temperature windowAnd (4) a mouth. In addition, in the sinter bed, a combustion reaction of a part of CO also occurs, and this process is called secondary CO removal. In addition, a part of dioxin can be removed by utilizing the combustion reaction of the dioxin in the high-temperature sinter bed.
In order to ensure that the oxygen content of the flue gas in the flue gas sealing cover 2 is more than 18 percent (when the oxygen content is more than 18 percent, the sintering production is not influenced), an oxygen supplementing device is arranged, and the oxygen supplementing device comprises an oxygen buffer tank 7, an oxygen uniform distributor 6 and the like. According to the data of an oxygen concentration analyzer 4 arranged on the flue gas seal cover 2, the oxygen injection amount is regulated (proportional integral derivative control) through PID. The pure oxygen is used for oxygen supplement, so that the flue gas circulation rate can reach more than 60 percent, and is much higher than the 20 percent flue gas circulation rate of the traditional flue gas circulation process.
4-8 flue gas sealing covers 2 are arranged on the sintering machine 1, the flue gas sealing covers 2 are connected with a circulating flue gas main pipe through circulating flue gas branch pipes, and in order to enable the circulating flue gas to be uniformly distributed in the flue gas sealing covers 2, the circulating flue gas is divided into 4-8 branch pipes (not limited to 4-8 branches, and the actual number is determined according to the scale of the sintering machine and the actual working condition) and is introduced into the flue gas sealing covers 2. Preferably, in the embodiment of the present invention, the circulating flue gas is divided into 4 branch pipes to be introduced into the flue gas sealing cover 2. The 4 paths of circulating flue gas branch pipes are respectively provided with an adjusting valve 5, and the opening degree of the adjusting valve 5 is adjusted according to the air permeability and the air demand difference of material layers in different areas, so that the flue gas pressure is kept stable in the flue gas sealing cover 2, the micro-negative pressure state is maintained, and the flue gas is prevented from leaking. In order to ensure real-time monitoring of the flue gas pressure, 4 pressure detection devices 3 (not limited to 4, the number of the pressure detection devices is consistent with that of the circulating flue gas branch pipes) are arranged on the flue gas sealing cover 2, and denitration treatment of the flue gas in the flue gas sealing cover 2 is completed again on a material layer of the sintering machine, namely, the process of re-sintering the flue gas in the flue gas sealing cover 2 in the sintering machine 1 is completed.
Preferably, the dedusting and denitration unit 40 includes a dedusting filter bag, the dedusting filter bag is sequentially provided with a dedusting layer 401 and a base fabric layer 402 from outside to inside, a bag cage 403 and a honeycomb activated carbon tube 404 are sequentially provided inside the dedusting filter bag, the dedusting filter bag is clamped in the bag cage 403 when the dedusting filter bag is installed, the honeycomb activated carbon tube 404 is clamped in the bag cage 403, an inner cavity of the honeycomb activated carbon tube 404 is a clean flue gas channel 405, and the sintering flue gas sequentially passes through the dedusting filter bag and the honeycomb activated carbon tube 404 from outside of the dedusting filter bag and then enters the upper box 45 through the clean flue gas channel 405.
The dust removal layer 401 is made of carbon fibers and polyphenylene sulfide fibers, is doped with ultrafine carbon fibers, is compact and is used for removing dust, and PM2.5 can be prevented from passing through the dust removal layer 401; the base cloth layer 402 is woven of carbon fibers and is less dense than the dust removal layer 401 for supporting and maintaining air permeability. The carbon fiber has the advantages of small density, light weight, good chemical corrosion resistance, fatigue resistance, long service life, high strength, high modulus, good thermal expansion coefficient, self-lubrication, wear resistance and the like. The carbon fiber is added into the filter material, so that the wear resistance, toughness and strength of the filter bag can be enhanced, the weight of the filter bag is reduced, the load of a dust remover is reduced, and the service life of the filter bag is prolonged. The denitration layer is a honeycomb activated carbon tube 404 which supports the SCR denitration catalyst. The honeycomb carbon has wide sources and low price; large specific surface area, microporous porous structure, high adsorption capacity, good catalyst dispersibility and adhesion; the catalyst has excellent heat conductivity, good chemical stability and excellent adsorption performance, and is an excellent catalyst carrier; the honeycomb activated carbon has the advantages of high porosity, large geometric surface area, small bed pressure drop, capability of avoiding smoke blockage and the like due to the unique parallel pore channel structure, and has good industrial application value. After the dust removal and denitration unit 40 is scrapped, the filter bag can be treated according to normal waste; because the main component of the denitration layer (the honeycomb-shaped activated carbon pipe 404) is activated carbon, the denitration layer is combustible and can be treated in a burning mode after being scrapped, on one hand, heat is released in burning, on the other hand, high-value metal elements such as V, W, Ti and the like can be extracted from burning ash and reused for manufacturing the SCR denitration catalyst, so that the resource recycling of the elements is realized, two purposes are achieved, and in order to improve the denitration efficiency, reduce the using amount of the catalyst and prolong the service life of the catalyst, more rapid SCR reactions are required to be performed in the dust removal and denitration device 39 as much as possible.
After passing through the dedusting layer 401 and the base cloth layer 402, the flue gas enters the honeycomb activated carbon tube 404, and the honeycomb activated carbon has the characteristics of large specific surface area, microporous porous structure, high adsorption capacity, good catalyst dispersibility, good chemical stability, excellent adsorption performance and the like, so that NO in the flue gasx、NH3The catalyst is relatively easy to be fully adsorbed on the surface of the denitration catalyst and generate the first denitration reaction. The flue gas after the first denitration enters the upper box body 45 through the catalyst central channel. For preventing NO in flue gasxSince the reaction is incomplete in the first denitration unit, a second ammonia injection grid 43 and a denitration catalyst layer 44, which are referred to as a second denitration unit, are sequentially disposed in the upper case 45 from bottom to top, where a second-stage denitration reaction occurs. For only setting up a denitration reaction, the utility model discloses a set up the two-stage denitration reaction, set up the hierarchical ammonia that spouts, the ammonia is spouted to the first order in the flue before dust removal denitrification facility 39 entries respectively, and the ammonia is spouted to the second level before SCR denitration catalyst layer 44, according to first CEMS analysis appearance 18, second CEMS analysis appearance 22 and the adjustment of fourth CEMS analysis appearance 42 test data and accurate control ammonia injection volume, reduces the ammonia escape. The flue gas after the two-stage denitration reaction is converged and then discharged to the downstream from the flue gas discharge flue.
Preferably, dust bag's upper end is connected with connecting pipe 60, the sintering flue gas is discharged in getting into connecting pipe 60 by clean flue gas passageway 405, connecting pipe 60 is hollow round platform structure, connecting pipe 60's tip is connected with dust bag's upper end, connecting pipe 60's tip is provided with the protruding edge of outside extension, protruding edge is located box 45, protruding edge is used for being connected with the assembly plate, protruding edge overlap joint is in the edge of pilot hole, thereby be convenient for dust removal denitration unit 40's installation. The other part of the connection pipe 60 and the entire dust collection bag are located in the lower case.
Preferably, the desulfurization flue gas desulfurization device further comprises an outer discharge flue 27, a desulfurization flue gas inlet is communicated with the outer discharge flue 27, a machine head main flue 30 is communicated with the outer discharge flue 27 through a machine head smoke exhaust flue 24, one end of a middle front section branch flue 59 is communicated with the middle front section smoke exhaust flue 25, the other end of the middle front section branch flue 59 is communicated with the outer discharge flue 27, a middle rear section main flue 32 is communicated with the outer discharge flue 27 through a middle rear section smoke exhaust flue 26, a first CEMS analyzer 18 is arranged on the outer discharge flue 27 and near the desulfurization flue gas inlet, a fourth valve 10 is arranged on the middle front section branch flue 59, and a fifth valve 11 is arranged on the middle front section smoke exhaust flue 25; the flow direction of the second path of flue gas can be controlled by opening and closing the fourth valve 10 and the fifth valve 11, an external circulation flue 28 is communicated with the position, which is positioned on the flue gas exhaust flue and between the third fan 21 and the desulfurization, dust removal and denitration device 19, the other part of the flue gas treated by the desulfurization, dust removal and denitration device 19 is sent into the flue gas mixer 9 through the external circulation flue 28, and the external circulation flue 28 is provided with a third valve 20; the circular cooler 17 is connected with the flue gas mixer 9 through a circular cooling flue 29.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
1. compared with the traditional sintering flue gas circulation + desulfurization + dedusting + denitration series technology, the organic combination of the sintering flue gas circulation technology and the desulfurization, dedusting and denitration integrated technology is realized, the investment and operation cost are saved, the occupied area is reduced, and the construction period is shortened;
2. compared with the traditional flue gas circulation technology, the oxygen-enriched sintering flue gas circulation (oxygen is supplemented into the flue gas through the oxygen distributor 6, so that the oxygen enrichment of the flue gas is realized), and the sintering flue gas circulation rate is improved from 20% to 60%;
3. the waste heat of the circular cooling flue gas is fully utilized, the temperature of the circulating flue gas is increased, and the waste heat utilization rate is increased;
4. SNCR (selective non-catalytic reduction) denitration reaction is carried out by utilizing a material layer temperature window 1 of the sintering machine, and NO in flue gas is reducedxConcentration;
5. the high temperature of the material bed 1 of the built-in combustion furnace and the sintering machine is respectively utilized to realize two-stage CO removal reaction. The high-concentration CO is changed into valuable, the resource utilization is realized, the CO concentration is reduced, the combustion latent heat of the CO is fully released, the flue gas temperature is increased, and the flue gas waste heat utilization rate is increased. And removing a part of dioxin by using the high temperature of the sinter bed.
6. The problem of traditional dust removal denitration integrated device face a series of difficult problems is solved, for example:
1) the dust removal unit and the denitration unit are designed in a split mode, so that the use and the maintenance are more convenient, the problem that the service lives of the dust removal function and the denitration function are inconsistent is fundamentally solved, the service time is effectively prolonged, and the maintenance cost is saved;
2) the carbon fiber is doped into the cloth bag, so that the wear resistance, toughness and strength of the cloth bag are improved, the service life is prolonged, and the cost is saved;
3) the desulfurized fly ash and the fresh desulfurizer are sprayed into the desulfurization reaction device 35 in a grading manner, so that the utilization rate and the desulfurization efficiency of the desulfurized fly ash can be improved;
4) two-stage ammonia spraying and two-stage denitration reaction are arranged in the system, the ammonia spraying amount is accurately controlled, the denitration efficiency is ensured, and ammonia escape is reduced;
5) the denitration module adopts the mode that honeycomb activated carbon pipe 404 supported low temperature denitration catalyst, makes things convenient for useless processing of danger, and denitration unit abandonment back can directly burn and release heat, and recoverable V, W, Ti metals of burning ash can be resourceized reuse through reasonable mode, avoids polluting and extravagant.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a sintering flue gas circulation is desulfurization dust removal denitration integrated device jointly, sintering flue gas refer to the flue gas that the sintering machine produced, and the sintering machine has the aircraft nose main flue of the first flue gas of discharge, the well anterior segment main flue of the second flue gas of discharge and the well back end main flue of the third flue gas of discharge, its characterized in that includes:
the gas-gas heat exchanger is used for exchanging heat between the second path of flue gas and the third path of flue gas;
the first path of flue gas is mixed with the third path of flue gas subjected to heat exchange by the gas-gas heat exchanger, and then is subjected to desulfurization treatment, dust removal treatment and denitration treatment by the desulfurization, dust removal and denitration device;
the smoke discharging equipment is used for discharging a part of the smoke treated by the desulfurization, dedusting and denitration device;
the combustion furnace is used for heating the second path of flue gas after heat exchange of the gas-gas heat exchanger;
and the other part of the flue gas treated by the desulfurization, dedusting and denitration device and the second path of flue gas heated by the combustion furnace are mixed by the flue gas mixer and then discharged into the sintering machine.
2. The integrated device of claim 1, wherein the sintering flue gas circulation and desulfurization, dust removal and denitration integrated device comprises a flue gas circulation unit,
the circular cooler can discharge flue gas, and the flue gas discharged by the circular cooler is sent into the flue gas mixer;
the desulfurization, dust removal and denitration device comprises a desulfurization reaction device and a dust removal and denitration device;
the dust removal and denitration device comprises a back flushing device, a plurality of dust removal and denitration units, an ash hopper, an assembly plate and a box body;
the assembly plate is arranged in the box body and divides the box body into an upper box body and a lower box body, a plurality of assembly holes are formed in the assembly plate, the upper end of the dust removal and denitration unit is an air outlet end and extends into the upper box body from the assembly holes, a blowing port of the back blowing device faces the air outlet end of the dust removal and denitration unit, the ash hopper is connected with the lower end of the lower box body, the lower end of the lower box body is open, and the ash hopper is communicated with the lower box body; the denitration device is characterized in that a denitration smoke inlet is formed in the lower box body, a denitration smoke outlet is formed in the upper box body, the denitration smoke outlet is communicated with the smoke exhaust equipment through a smoke exhaust flue, a third fan is arranged on the smoke exhaust flue, a second CEMS analyzer is arranged on the smoke exhaust flue and between the third fan and the smoke exhaust equipment, the plurality of dust removal and denitration units are vertically arranged in the box body, and the plurality of dust removal and denitration units are parallel to each other.
3. The integrated device for desulfurization, dust removal and denitration of the sintering flue gas circulation combination of claim 2, further comprising a second denitration unit, wherein the second denitration unit comprises a denitration catalyst layer and a second ammonia injection grid;
the denitration catalyst layer is arranged in the upper box body and is positioned below the denitration exhaust port, the second ammonia injection grid is arranged between the back blowing device and the denitration catalyst layer, the second ammonia injection grid is used for providing a reducing agent for the denitration reaction of the second denitration unit, and the nozzle of the second ammonia injection grid faces the dedusting and denitration unit;
and a fourth CEMS analyzer is arranged on the side wall of the upper box body and positioned between the second ammonia injection grid and the back blowing device.
4. The integrated desulfurization, dust removal and denitration device of claim 3, wherein the desulfurization reaction device comprises a vertically disposed desulfurization coiled pipe, a first desulfurizer injection port, and a second desulfurizer injection port, the desulfurization coiled pipe comprises at least one lower bend and one upper bend, one end of the desulfurization coiled pipe is provided with a desulfurization flue gas inlet, the other end of the desulfurization coiled pipe is provided with a desulfurization flue gas outlet, the first flue gas and a third flue gas after heat exchange by the gas-gas heat exchanger enter the desulfurization coiled pipe through the desulfurization flue gas inlet, the first desulfurizer injection port is disposed on the desulfurization flue gas inlet, the second desulfurizer injection port is disposed at the lower bend, the desulfurization coiled pipe is provided with a third CEMS analyzer, and the third CEMS analyzer is disposed between the desulfurization flue gas inlet and the second desulfurizer injection port, and the desulfurization flue gas outlet is communicated with the denitration smoke inlet.
5. The integrated device for desulfurization, dust removal and denitration in a circulating manner for sintering flue gas as claimed in claim 4, further comprising a plurality of desulfurization ash circulating devices, wherein each desulfurization ash circulating device is connected with one ash bucket, each desulfurization ash circulating device comprises a bin pump, a compressed air storage tank and a desulfurization ash sampling port, a feed inlet of the bin pump is communicated with the bottom end of the ash bucket, the compressed air storage tank is communicated with the bin pump through a compressed air pipeline, a discharge outlet of the bin pump is communicated with the first desulfurizer spraying port through a secondary desulfurizer pipeline, the desulfurization ash sampling port is arranged on the secondary desulfurizer pipeline and close to the bin pump, a first valve is arranged on the secondary desulfurizer pipeline and between the desulfurization ash sampling port and the first desulfurizer spraying port, and an ash silo is connected on the secondary desulfurizer pipeline and between the first valve and the desulfurization ash sampling port And the ash storage branch pipe is provided with a second valve, and the desulfurized ash in the bin pump can be conveyed into the ash storage through the ash storage branch pipe by opening the second valve.
6. The integrated device of claim 4, further comprising an ammonia supply system, wherein the ammonia injection subsystem comprises: first ammonia injection grid, controlling means and ammonia making device, the ammonia making device through first ammonia pipeline with first ammonia injection grid intercommunication, the ammonia making device through the second ammonia pipeline with second ammonia injection grid intercommunication, controlling means is used for control ammonia making device system ammonia, be equipped with the sixth valve on the first ammonia pipeline, first ammonia injection grid is located and is close on the desulfurization coiled pipe the department of buckling of upper portion.
7. The integrated device of claim 4, wherein the combustion furnace is a built-in combustion furnace, the middle-front section main flue is communicated with the combustion furnace through a middle-front section smoke exhaust flue, the combustion furnace is communicated with the smoke mixer through a combustion flue, a second fan is arranged on the combustion flue, one end of a combustion-supporting flue is connected to the combustion flue and positioned between the combustion furnace and the second fan, the other end of the combustion-supporting flue is communicated with the combustion furnace, and a first fan is arranged on the combustion-supporting flue;
the device also comprises two CO concentration analyzers, wherein one CO concentration analyzer is arranged on the middle front section smoke exhaust flue and is positioned between the gas-gas heat exchanger and the combustion furnace, and the other CO concentration analyzer is arranged on the combustion flue and is positioned between the combustion-supporting flue and the combustion furnace.
8. The integrated device for desulfurization, dedusting and denitration by sintering flue gas circulation and combination as claimed in claim 1, further comprising an oxygen supplementing device, an ammonia spraying device, a flue gas sealing cover and a circulating flue gas main pipe;
the flue gas sealing cover is arranged on the sintering machine, the flue gas mixer is communicated with one end of the circulating flue gas main pipe, the upper end of the flue gas sealing cover is connected with one end of a circulating flue gas branch pipe, and the other end of the circulating flue gas branch pipe is connected with the circulating flue gas main pipe;
the oxygen supplementing device comprises an oxygen buffer tank and an oxygen distributor, the oxygen buffer tank is provided with an oxygen inlet and an oxygen outlet, the input end of the oxygen distributor is communicated with the oxygen outlet, the output end of the oxygen distributor is arranged on the main circulating flue gas pipe and is positioned between the branch circulating flue gas pipe and the flue gas mixer, and the ammonia spraying device is arranged on the main circulating flue gas pipe and is positioned between the oxygen distributor and the flue gas mixer;
the circulating flue gas branch pipe is provided with a regulating valve, the upper end of the flue gas sealing cover is provided with a pressure detection device and an oxygen concentration analyzer, the pressure detection device is used for monitoring the internal pressure of the flue gas sealing cover, and the oxygen concentration analyzer is used for monitoring the oxygen concentration in the flue gas sealing cover.
9. The integrated device of claim 2, wherein the dedusting and denitration unit comprises a dedusting filter bag, the dedusting filter bag is sequentially provided with a dedusting layer and a base cloth layer from outside to inside, a bag cage and a honeycomb activated carbon tube are sequentially arranged inside the dedusting filter bag, an inner cavity of the honeycomb activated carbon tube is a clean flue gas channel, the sintering flue gas sequentially passes through the dedusting filter bag and the honeycomb activated carbon tube from outside of the dedusting filter bag and then enters the upper box body through the clean flue gas channel, the upper end of the dedusting filter bag is connected with a connecting tube, the sintering flue gas enters the connecting tube from the clean flue gas channel and is discharged, the connecting tube is of a hollow round platform structure, the small end of the connecting tube is connected with the upper end of the dedusting filter bag, and the small end of the connecting tube is provided with a convex edge extending outwards, the convex edge is positioned in the upper box body.
10. The integrated device of claim 7, further comprising an outer discharge flue, wherein the desulfurized flue gas inlet is communicated with the outer discharge flue, the nose main flue is communicated with the outer discharge flue through a nose smoke exhaust flue, one end of a middle front section branch flue is communicated with the middle front section smoke exhaust flue, the other end of the middle front section branch flue is communicated with the outer discharge flue, the middle rear section main flue is communicated with the outer discharge flue through a middle rear section smoke exhaust flue, a first CEMS analyzer is arranged on the outer discharge flue and close to the desulfurized flue gas inlet, a fourth valve is arranged on the middle front section branch flue, and a fifth valve is arranged on the middle front section smoke exhaust flue before entering the gas heat exchanger;
an external circulation flue is communicated with the position, which is positioned on the flue gas discharge flue and between the third fan and the desulfurization, dedusting and denitration device, the other part of the flue gas treated by the desulfurization, dedusting and denitration device is sent into the flue gas mixer through the external circulation flue, and a third valve is arranged on the external circulation flue;
the circular cooler is communicated with the flue gas mixer through a circular cooling flue.
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| CN116726682A (en) * | 2023-08-14 | 2023-09-12 | 北京中航泰达环保科技股份有限公司 | Dry desulfurization, denitrification and dust removal device and modular dry desulfurization, denitrification and dust removal system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116726682A (en) * | 2023-08-14 | 2023-09-12 | 北京中航泰达环保科技股份有限公司 | Dry desulfurization, denitrification and dust removal device and modular dry desulfurization, denitrification and dust removal system |
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