CN214781926U - Parallelly connected voltage-sharing diffuses full recovery system of coal gas - Google Patents
Parallelly connected voltage-sharing diffuses full recovery system of coal gas Download PDFInfo
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- CN214781926U CN214781926U CN202121050485.7U CN202121050485U CN214781926U CN 214781926 U CN214781926 U CN 214781926U CN 202121050485 U CN202121050485 U CN 202121050485U CN 214781926 U CN214781926 U CN 214781926U
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Abstract
The utility model discloses a parallelly connected voltage-sharing diffuses full recovery system of coal gas, including the one-level dust remover (4) that connects gradually, gas recovery pipeline mechanism and second grade dust remover (24), this gas recovery pipeline mechanism contains parallelly connected natural pressure difference that sets up and retrieves passageway (28) and injection device and retrieves passageway (29), injection device retrieves passageway (29) and contains suction line (30) that connect gradually, injection device (12) and mixing output pipeline (31), injection device (12) contain a plurality of ejectors, one-level dust remover (4) combustion gas can get into second grade dust remover (24) through this gas recovery pipeline mechanism. The parallel pressure-equalizing diffused gas full-recovery system can reduce the full-recovery time of pressure-equalizing diffused gas, improve the recovery efficiency and avoid influencing the distribution operation of the raw fuel at the top of the blast furnace.
Description
Technical Field
The utility model relates to a metallurgical ironmaking technical field, specifically a parallelly connected voltage-sharing diffuses full recovery system of coal gas.
Background
The coal gas discharged along with the blast furnace iron making for a long time comprises two parts: one part is gas discharged from the charging bucket during charging at the top of the blast furnace, which is called pressure equalizing and bleeding gas, and the other part is gas discharged from the top of the blast furnace through chemical reaction of raw fuel in the blast furnace, which is called top gas.
The top pressure-equalizing and bleeding gas necessary for blast furnace production is diffused into the atmosphere (about 300 times of air discharge every day) through a cyclone dust collector and a silencer before each charging, and the pressure-equalizing and bleeding gas contains a large amount of CO and CO2And the toxicity of dust,The quantity of the combustible mixed gas which is diffused by pressure equalizing is 6Nm3Per ton of iron-8 Nm3Per ton of iron, dust content over 10g/Nm3About 7 hundred million tons of iron water are produced in China every year, and the gas quantity discharged to the atmosphere through the blast furnace top pressure equalizing and bleeding equipment is as high as 55 hundred million m3Per year, blast furnace gas unit price is 0.11 yuan/Nm3The economic loss caused by the part of the coal gas is calculated to be about 6 million yuan per year, and the amount of the discharged dust reaches 5.5 million tons per year. The pressure-equalizing diffused gas in the blast furnace ironmaking production process is directly discharged into the atmosphere, which not only causes the atmospheric environmental pollution, but also wastes energy.
There are many technologies at home and abroad to realize the recovery of the blast furnace top pressure-equalizing diffused gas, and some have obtained good effects, such as chinese patent document CN 109234481 a, published date 2019, 1 month and 18 days, which discloses "a method and system for fully recovering diffused gas from a blast furnace top charging bucket", wherein two recovery stages are correspondingly adopted according to the pressure of the diffused gas in the charging bucket: a high-pressure gas recovery stage and a low-pressure gas recovery stage. In the high-pressure gas recovery stage, the high-pressure diffused gas in the charging bucket is directly recovered to a gas pipe network by using the free gas pressure difference between the diffused gas in the charging bucket and the gas pipe network; in the low-pressure gas recovery stage, the diffused gas in the charging bucket is guided by an ejector, and the ejector adopts primary pressure-equalizing gas (the pressure is more than 0.3MPa) of the charging bucket or secondary pressure-equalizing nitrogen of the charging bucket as a guide source (the pressure of the primary pressure-equalizing gas is less than 0.3 MPa).
The method and the system divide the dispersed gas in the charging bucket into a high-pressure stage and a low-pressure stage for recycling, and only the ejector is used for improving the recycling speed in the low-pressure stage, so that the recycling time is prolonged, and the distribution operation of the raw fuel at the top of the blast furnace is influenced to a certain extent; when the pressure of the primary pressure-equalizing gas is less than 0.3MPa, secondary pressure-equalizing nitrogen is adopted as an injection source, and although the secondary pressure-equalizing nitrogen does not pollute the recovered diffused gas, the quality of the recovered gas can be obviously reduced, the value of the recovered gas is influenced, and the operation cost (the cost of nitrogen is higher than that of gas) can be increased; in this patent technique, high-pressure gas (draw and penetrate the medium) and get into the ejector perpendicularly to ejector axial direction, can influence like this and draw and penetrate the effect.
SUMMERY OF THE UTILITY MODEL
In order to improve the recovery efficiency of the pressure-equalizing diffused gas, the utility model provides a parallelly connected pressure-equalizing diffused gas full recovery system, this parallelly connected pressure-equalizing diffused gas full recovery system can reduce the full recovery time of the pressure-equalizing diffused gas, improve recovery efficiency, avoid influencing the cloth operation of the blast furnace top raw fuel.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a parallelly connected voltage-sharing diffuses full recovery system of coal gas, is including the one-level dust remover that connects gradually, gas recovery pipeline mechanism and second grade dust remover, and this gas recovery pipeline mechanism contains parallelly connected natural pressure difference recovery passageway and the injection device recovery passageway that sets up, and the injection device recovery passageway contains the suction line who connects gradually, injection device and mixed output pipeline, and injection device contains a plurality of ejectors, and the one-level dust remover combustion gas can get into in the second grade dust remover through this gas recovery pipeline mechanism.
The ejector comprises a jet flow inlet, a suction inlet and a mixture outlet, one end of a suction pipeline is connected with the suction inlet of the ejector, one end of a mixing output pipeline is connected with the mixture outlet of the ejector, and a jet flow supply pipeline is connected outside the jet flow inlet of the ejector.
One end of the natural pressure difference recovery passage is connected with a first outlet of the primary dust remover, the other end of the natural pressure difference recovery passage is connected with an inlet of the secondary dust remover, the other end of the suction pipeline and the other end of the mixed output pipeline are both connected with the natural pressure difference recovery passage, and the other end of the mixed output pipeline is positioned between the other end of the suction pipeline and the natural pressure difference recovery passage.
The injection device comprises a first injector and a second injector, the jet inlet of the first injector is the jet inlet of the injection device, the suction inlet of the first injector is the suction inlet of the injection device, the mixing outlet of the second injector is the mixture outlet of the injection device, the jet inlet of the first injector is communicated with the jet inlet of the second injector through a first branch line, and the mixing outlet of the first injector is communicated with the suction inlet of the second injector through a second branch line.
The ejector device comprises a first ejector, a second ejector and a third ejector, a jet inlet of the first ejector is a jet inlet of the ejector device, a suction inlet of the first ejector is a suction inlet of the ejector device, a mixing outlet of the third ejector is a mixture outlet of the ejector device, the jet inlet of the first ejector is communicated with a jet inlet of the second ejector through a first branch line, a mixing outlet of the first ejector is communicated with a suction inlet of the second ejector through a second branch line, the jet inlet of the second ejector is communicated with a jet inlet of the third ejector through a third branch line, and a mixing outlet of the second ejector is communicated with a suction inlet of the third ejector through a fourth branch line.
At least one of the plurality of ejectors is a multi-nozzle composite ejector device; the multi-nozzle combined type injection device comprises an injected medium suction mixing part and an injection medium part, wherein the injected medium suction mixing part is of a cylindrical structure, the injection medium part comprises an injection medium main pipe, an injection medium ring pipe and a plurality of injection medium branch pipes which are sequentially arranged, the outlet ends of the plurality of injection medium branch pipes are all positioned in the injected medium suction mixing part, and the outlet ends of the injection medium branch pipes face the outlet end of the injected medium suction mixing part; the inlet of the mixing component sucked by the ejection medium is a suction inlet of the ejector, the outlet of the mixing component sucked by the ejection medium is a mixing outlet of the ejector, and the inlet of the ejection medium component is an ejection inlet of the ejector; the plurality of ejecting medium branch pipes are arranged at intervals along the circumferential direction of the mixing component sucked by the ejecting medium, and the outlet ends of the plurality of ejecting medium branch pipes are alternately arranged far and near the axis of the mixing component sucked by the ejecting medium.
The outlet ends of one part of the plurality of medium injection branch pipes are located on the first inner circle, the outlet ends of the other part of the plurality of medium injection branch pipes are located on the second inner circle, the diameter of the first inner circle is smaller than that of the second inner circle, and the circle center of the first inner circle and the circle center of the second inner circle are located on the axis of the mixing part sucked by the injection medium.
The plane where the first inner circle is located and the plane where the second inner circle is located are perpendicular to the axis of the injection medium sucking mixing component, and the distance from the first inner circle to the outlet end of the injection medium sucking mixing component is smaller than or larger than the distance from the second inner circle to the outlet end of the injection medium sucking mixing component.
The medium flow that the spiral gos forward can be erupted to the exit end that is located the drawing medium branch pipe on the first circle, perhaps, the medium flow that the spiral gos forward can be erupted to the exit end that is located the drawing medium branch pipe on the second circle.
The injected medium suction mixing part comprises an injected medium inlet section, an inlet expansion section, an introduction section, a reducing section, a mixing section, an expanding section and a leading-out section which are sequentially arranged along the axial direction, wherein the introduction section is provided with a purging port and a first pressure measuring port, the leading-out section is provided with a dispersing port and a second pressure measuring port, and the reducing section and the expanding section are provided with lifting lugs; the outlet of the injection medium branch pipe is provided with an injection medium nozzle, and the injection medium nozzle comprises an injection medium inner leading-in section, an injection medium inner contraction section and an injection medium inner diffusion section which are sequentially arranged along the axial direction.
The utility model has the advantages that:
1. the high-efficiency parallel recovery can reduce the full recovery time of the pressure-equalizing diffused gas, improve the recovery efficiency and avoid influencing the distribution operation of the raw fuel at the top of the blast furnace.
2. The injection device comprises a plurality of injectors, and injection efficiency can be greatly improved.
3. The high-pressure injection medium of the injection device is made of primary pressure-equalizing clean gas or high-pressure gas with pressure higher than that of a clean gas pipe network, so that the problems that secondary pressure-equalizing nitrogen or other high-pressure gas is used as the injection medium to reduce the quality of recovered gas and increase the operation cost due to consumption of nitrogen can be solved.
4. When the pressure-equalizing bleeding gas recovery system breaks down, the pressure-equalizing bleeding valve can be opened temporarily, so that the pressure-equalizing bleeding gas is discharged to the air through the silencer after primary dust removal, air pollution can be reduced, and the influence on the normal production of the blast furnace can be avoided.
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.
Fig. 1 is a schematic structural view of a parallel pressure-equalizing diffused gas full recovery system according to example 1.
FIG. 2 is a diagram of a parallel pressure-equalizing and bleeding gas full recovery system according to example 1.
Fig. 3 is a schematic view of an ejector in example 1.
Fig. 4 is a schematic view of the ejector device of example 1 including two ejectors.
Fig. 5 is a schematic view of the ejector of example 1 including three ejectors.
Fig. 6 is a schematic left side view of the multi-nozzle composite ejector according to embodiment 2 of the present invention.
Fig. 7 is a schematic view along the direction D-D in fig. 6.
Fig. 8 is a schematic view in which the distance from the first inner circle to the outlet end of the injection medium-suctioned mixing element is smaller than the distance from the second inner circle to the outlet end of the injection medium-suctioned mixing element in example 2.
Fig. 9 is a schematic view showing that the distance from the first inner circle to the outlet end of the injection medium-sucked mixing element is larger than the distance from the second inner circle to the outlet end of the injection medium-sucked mixing element in example 2.
Fig. 10 is a schematic view of an ejection medium nozzle in example 2.
Fig. 11 is a schematic left side view of the multi-nozzle composite ejector according to embodiment 3 of the present invention.
Fig. 12 is a schematic view along the direction E-E in fig. 11.
1. A charging bucket; 2. a first pressure gauge; 3. a dust recovery valve; 4. a primary dust remover; 5. a primary pressure equalizing valve; 6. a pressure equalizing blow-off valve; 7. a muffler; 8. a primary pressure-equalizing clean gas injection supply valve; 9. a first thermometer; 10. a second pressure gauge; 11. a first flow meter; 12. an injection device; 13. a pressure-equalizing bleeding gas injection supply valve; 14. a pressure-equalizing bleeding gas injection recovery valve; 15. a natural gas recovery valve for pressure-equalizing diffusion gas; 16. a second thermometer; 17. a third pressure gauge; 18. a second flow meter; 19. a dust concentration detector; 20. a third thermometer; 21. a fourth pressure gauge; 22. a third flow meter; 23. a clean gas check valve; 24. a secondary dust remover; 25. an ash discharge valve; 26. a fifth pressure gauge; 27. a net gas pipe network; 28. a natural differential pressure recovery path; 29. a recovery passage of the injection device; 30. a suction line; 31. a mixing output line; 32. a jet supply line; 33. a gas blow-off line; 34. a primary pressure-equalizing clean gas delivery line; 35. a primary pressure equalizing system; 36. a pressure-equalizing gas discharge line; 37. a clean gas transfer line;
1201. a first ejector; 1202. a second ejector; 1203. a third ejector; 1204. a jet inlet; 1205. a suction inlet; 1206. a mixture outlet; 1207. a first branch line; 1208. a second branch line; 1209. a third branch line; 12010. a fourth branch line;
121. is sucked into the mixing component by the ejection medium; 122. a medium ejecting part;
1211. an injected medium inlet section; 1212. an inlet expansion section; 1213. a lead-in section; 1214. a reducing section; 1215. a mixing section; 1216. a diameter expanding section; 1217. a lead-out segment; 1218. a first inner circle; 1219. a second inner circle; 12110. a purge port; 12111. a first pressure port; 12112. lifting lugs; 12113. a dispensing opening; 12114. a second pressure port;
1221. a main injection medium pipe; 1222. a medium injection ring pipe; 1223. ejecting medium branch pipes; 1224. an ejection medium nozzle;
12241. an injection medium internal leading-in section; 12242. an injection medium inner contraction section; 12243. and the injection medium internal diffusion section.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The utility model provides a parallelly connected voltage-sharing diffuses full recovery system of coal gas, including the one-level dust remover 4 that connects gradually, coal gas recovery pipeline mechanism and second grade dust remover 24, this coal gas recovery pipeline mechanism contains parallelly connected natural pressure difference recovery access 28 and the injection device of setting and retrieves access 29, injection device retrieves access 29 and contains suction line 30, injection device 12 and the mixed output pipeline 31 that connects gradually, injection device 12 contains a plurality of injectors, the gas that one-level dust remover 4 discharged can get into second grade dust remover 24 through this coal gas recovery pipeline mechanism in, as shown in fig. 1 and fig. 2.
This parallelly connected voltage-sharing whole recovery system of coal gas that diffuses contains the natural pressure difference recovery path 28 and the injection device recovery path 29 of parallelly connected setting and carries out the complete recovery of voltage-sharing gas that diffuses, and injection device recovery path 29 contains suction line 30, induction apparatus 12 and the mixing output pipeline 31 that connects gradually, and injection apparatus 12 contains a plurality of ejectors, can reduce the full recovery time of voltage-sharing gas that diffuses, improves recovery efficiency, avoids influencing the cloth operation of blast furnace roof raw fuel.
In this embodiment, the ejector 12 includes a jet flow inlet 1204, a suction inlet 1205 and a mixture outlet 1206, one end of the suction line 30 is connected to the suction inlet 1205 of the ejector 12, one end of the mixing output line 31 is connected to the mixture outlet 1206 of the ejector 12, and the jet flow inlet 1204 of the ejector 12 is externally connected to the jet flow supply line 32.
In the present embodiment, one end of the natural pressure difference recovery passage 28 is connected to the first outlet of the primary dust collector 4, the other end of the natural pressure difference recovery passage 28 is connected to the inlet of the secondary dust collector 24, the other end of the suction line 30 and the other end of the mixing output line 31 are both connected to the natural pressure difference recovery passage 28, and the other end of the mixing output line 31 is located between the other end of the suction line 30 and the natural pressure difference recovery passage 28, as shown in fig. 1.
In this embodiment, the ejector 12 may include a plurality of ejectors therein, which are products of the prior art. The ejector comprises an injection port A, a suction port B and a mixing outlet C, and the injection fluid can generate negative pressure after entering the ejector from the injection port A so as to automatically suck the fluid, so that the suction port B enters and is mixed with the injection fluid. The injection port A and the mixing outlet C are on the same straight line, the included angle between the axial direction of the suction port B and the connecting line of the injection port A and the mixing outlet C is alpha, alpha is more than or equal to 0 degrees and less than or equal to 90 degrees, and the included angle is shown in figure 3.
When the ejector 12 includes two ejectors, that is, the ejector 12 includes a first ejector 1201 and a second ejector 1202, a jet inlet a of the first ejector 1201 is a jet inlet 1204 of the ejector 12, a suction inlet B of the first ejector 1201 is a suction inlet 1205 of the ejector 12, a mixing outlet C of the second ejector 1202 is a mixture outlet 1206 of the ejector 12, the jet inlet a of the first ejector 1201 is communicated with the jet inlet a of the second ejector 1202 through a first branch line 1207, and the mixing outlet C of the first ejector 1201 is communicated with the suction inlet B of the second ejector 1202 through a second branch line 1208, as shown in fig. 4.
When the injection device 12 comprises three injectors, the injection device 12 comprises a first injector 1201, the injection inlet a of the first injector 1201 is a jet inlet 1204 of the injection device 12, the suction inlet B of the first injector 1201 is a suction inlet 1205 of the injection device 12, the mixing outlet C of the third injector 1203 is a mixture outlet 1206 of the injection device 12, the injection inlet a of the first injector 1201 is communicated with the injection inlet a of the second injector 1202 through a first branch line 1207, the mixing outlet C of the first injector 1201 is communicated with the suction inlet B of the second injector 1202 through a second branch line 1208, the injection inlet a of the second injector 1202 is communicated with the injection inlet a of the third injector 1203 through a third branch line 1209, and the mixing outlet C of the second injector 1202 is communicated with the suction inlet B of the third injector 1203 through a fourth branch line 12010, as shown in fig. 5. When four ejectors are included in the ejector 12, the connection relationship can also refer to fig. 5.
In this embodiment, the natural pressure difference recovery passage 28 is provided with a first thermometer 9, a second manometer 10, a first flowmeter 11, a pressure-equalizing natural relief gas recovery valve 15, a second thermometer 16, a third manometer 17, and a second flowmeter 18, the pressure-equalizing natural relief gas recovery valve 15 is located between the other end of the suction line 30 and the other end of the mixing output line 31, the suction line 30 is provided with a pressure-equalizing bleed gas injection supply valve 13, and the mixing output line 31 is provided with a pressure-equalizing bleed gas injection recovery valve 14, as shown in fig. 1.
In this embodiment, the parallel pressure-equalizing bleeding gas full-recovery system further includes a muffler 7, the second outlet of the primary dust remover 4 is connected to the inlet of the muffler 7 through a gas bleeding line 33, a pressure-equalizing bleeding valve 6 is disposed on the gas bleeding line 33, the gas bleeding line 33 is connected to a primary pressure-equalizing system 35 through a primary pressure-equalizing clean gas delivery line 34, the primary pressure-equalizing system 35 contains primary pressure-equalizing clean gas, one end of the jet supply line 32 is connected to the primary pressure-equalizing clean gas delivery line 34 (or one end of the jet supply line 32 is connected to a high-pressure gas source, the pressure of the high-pressure gas source is higher than the pressure of the following clean gas pipe network 27), the other end of the jet supply line 32 is connected to the jet inlet 1204 of the injector 12, a primary pressure-equalizing clean gas injection supply valve 8 is disposed on the jet supply line 32, and the primary pressure-equalizing gas in the primary pressure-equalizing system 35 can enter the jet supply line 32 or the primary pressure-equalizing clean gas delivery line 34 (i.e. the primary pressure equalizing gas in the primary pressure equalizing system 35 can enter the gas emission line 33 through the primary pressure equalizing clean gas conveying line 34).
In this embodiment, the parallel pressure-equalizing and bleeding gas full-recovery system further comprises a charging bucket 1, the charging bucket 1 is connected with an inlet of the primary dust remover 4 through a pressure-equalizing gas discharge pipeline 36, the charging bucket 1 is connected with a first pressure gauge 2, and the first pressure gauge 2 can measure the pressure in the charging bucket 1. The pressure equalizing gas discharge pipeline 36 is provided with a dust recovery valve 3. One end of the primary pressure-equalizing clean gas conveying pipeline 34 is connected with the gas bleeding pipeline 33, and one end of the primary pressure-equalizing clean gas conveying pipeline 34 is positioned between the pressure-equalizing bleeding valve 6 and the primary dust remover 4, as shown in fig. 1.
In this embodiment, the parallel pressure-equalizing bleeding gas full recovery system further includes a clean gas pipe network 27, the exhaust port of the secondary dust remover 24 is connected to the clean gas pipe network 27 through a clean gas conveying pipeline 37, the clean gas pipe network 27 is connected to a fifth pressure gauge 26, and the fifth pressure gauge 26 can measure the pressure in the clean gas pipe network 27. The clean gas delivery line 37 is provided with a dust concentration detector 19, a third thermometer 20, a fourth pressure gauge 21, a third flow meter 22, and a clean gas check valve 23. An ash discharge valve 25 is arranged outside the lower end of the secondary dust remover 24.
The method for fully recovering the parallel pressure-equalizing diffused gas is introduced below, the method for fully recovering the parallel pressure-equalizing diffused gas adopts the system for fully recovering the parallel pressure-equalizing diffused gas, and the method for fully recovering the parallel pressure-equalizing diffused gas comprises the following steps of:
step 2, the pressure-equalizing diffused coal gas in the primary dust remover 4 enters a secondary dust remover 24 through the coal gas recovery pipeline mechanism;
and 3, the coal gas in the secondary dust remover 24 enters a clean coal gas pipe network 27.
In step 2, when the pressure of the pressure-equalizing diffused gas in the charging bucket 1 is higher than the pressure in the clean gas pipe network 27, the natural pressure difference recovery passage 28 and the injection device recovery passage 29 are both in an open state, the pressure-equalizing diffused gas in the primary dust remover 4 enters the secondary dust remover 24 through the natural pressure difference recovery passage 28 and the injection device recovery passage 29, and the two passages simultaneously recover the pressure-equalizing diffused gas.
Specifically, in the initial stage of recovering the pressure-equalizing diffused gas, the initial pressure in the charging bucket 1 is about 0.25MPa, the pressure in the clean gas pipe network 27 is 0.01MPa-0.015MPa, the primary pressure-equalizing clean gas injection supply valve 8, the pressure-equalizing diffused gas injection supply valve 13, the pressure-equalizing diffused gas injection recovery valve 14 and the pressure-equalizing diffused gas natural recovery valve 15 are opened, and the pressure-equalizing diffused gas is led out of the charging bucket 1 at the top of the furnace, passes through the primary dust remover 4, then enters the secondary dust remover 24 through the natural pressure difference recovery passage 28 and the injection device recovery passage 29, and is recovered with the clean gas pipe network 27.
Namely, the natural pressure difference recovery passage 28 realizes recovery by utilizing the natural pressure difference of the pressure-equalizing diffused gas and the clean gas pipe network 27 in the charging bucket 1, and the pressure-equalizing diffused gas directly enters the secondary dust remover 24 through the natural pressure difference recovery passage 28 after passing through the primary dust remover 4; the injection device recycling passage 29 introduces pressure-equalizing bleeding coal gas into the injection device 12, primary pressure-equalizing clean coal gas (the pressure is about 0.25MPa) in the primary pressure-equalizing system 35 is used as a high-pressure injection medium, recycling efficiency is improved through injection, and efficient and complete recycling of the pressure-equalizing bleeding coal gas can be achieved.
In step 2, when the pressure of the pressure-equalizing bleeding gas in the charging bucket 1 is lower than the pressure in the clean gas pipe network 27, the pressure-equalizing bleeding gas natural recovery valve 15 on the natural pressure difference recovery passage 28 is closed, so that the injection device recovery passage 29 is in an independent opening state, the pressure-equalizing bleeding gas in the primary dust remover 4 only enters the secondary dust remover 24 through the injection device recovery passage 29, and the injection device recovery passage 29 is utilized to realize the complete recovery of the residual pressure-equalizing bleeding gas in the charging bucket.
Specifically, the natural gas pressure-equalizing and bleeding recovery valve 15 is closed, and the natural pressure difference recovery passage is closed. And opening the primary pressure-equalizing clean gas injection supply valve 8, the pressure-equalizing bleeding gas injection supply valve 13 and the pressure-equalizing bleeding gas injection recovery valve 14, and completely recovering the residual pressure-equalizing bleeding gas in the charging bucket 1 by using the injection device 12.
In the step 2, when the pressure of the pressure-equalizing bleeding gas in the charging bucket 1 is reduced to below 5000Pa, the natural pressure difference recovery passage 28 and the injection device recovery passage 29 are both in a closed state, and because the content of the pressure-equalizing bleeding gas in the charging bucket 1 is low, the full recovery of the pressure-equalizing bleeding gas can be considered to be completed.
Specifically, the primary pressure equalizing valve 5, the primary pressure equalizing clean gas injection supply valve 8, the pressure equalizing blow-off gas injection supply valve 13, the pressure equalizing blow-off gas injection recovery valve 14 and the pressure equalizing blow-off gas natural recovery valve 15 are closed, and the full recovery of the pressure equalizing blow-off gas is completed.
When the pressure-equalizing bleeding gas recovery system breaks down, the pressure-equalizing bleeding valve 6 can be opened temporarily, so that the pressure-equalizing bleeding gas is discharged to the air through the primary dust remover 4 and the silencer 7 at one time, and the influence on the normal production of the blast furnace is avoided. In the utility model, the pressure of the pressure-equalizing and bleeding gas in the charging bucket 1 and the gas pressure in the clean gas pipe network 27 should be monitored and compared in real time.
Parallelly connected voltage-sharing diffused gas full recovery system retrieves and once voltage-sharing clean gas draws to penetrate to retrieve two kinds of modes and realizes retrieving the high-efficient parallelly connected complete of voltage-sharing diffused gas through natural pressure differential, can reduce the full recovery time of voltage-sharing diffused gas, improve recovery efficiency, avoids influencing the cloth operation of blast furnace roof raw fuel. This system utilizes injection device, can improve to draw and penetrate efficiency by a wide margin. The primary pressure-equalizing clean coal gas is used as a high-pressure injection medium of the injection device, so that the problems that the quality of recovered coal gas is reduced and the operation cost is increased due to the consumption of nitrogen when secondary pressure-equalizing nitrogen is used as an injection medium can be solved.
Example 2
The embodiment is an improvement of embodiment 1, and the main difference between the embodiment and embodiment 1 is that at least one of the plurality of ejectors is a multi-nozzle compound ejector.
In this embodiment, the multi-nozzle composite injection device includes an injected medium suction mixing component 121 and an injection medium component 122, the injected medium suction mixing component 121 is a cylindrical structure, the injection medium component 122 includes an injection medium main pipe 1221, an injection medium ring pipe 1222 and a plurality of injection medium branch pipes 1223, which are sequentially arranged, outlet ends of the plurality of injection medium branch pipes 1223 are all located in the injected medium suction mixing component 121, and outlet ends of the injection medium branch pipes 1223 face an outlet end of the injected medium suction mixing component 121; an inlet B of the injection medium sucked mixing part 121 is a suction inlet B of the injector, an outlet C of the injection medium sucked mixing part 121 is a mixing outlet C of the injector, and an inlet a of the injection medium part 122 is a jet inlet A of the injector; the plurality of injection medium branch pipes 1223 are uniformly arranged at intervals along the circumferential direction of the injection medium suction mixing part 121, and the distances from the outlet ends of the plurality of injection medium branch pipes 1223 to the axis of the injection medium suction mixing part 121 are alternately arranged far and near, as shown in fig. 6 and 7.
In this embodiment, a part (e.g., half) of the plurality of ejection medium branch pipes 1223 is located on the first inner circle 1218, another part (e.g., the other half) of the plurality of ejection medium branch pipes 1223 is located on the second inner circle 1219, the diameter of the first inner circle 1218 is smaller than the diameter of the second inner circle 1219, and the center of the first inner circle 1218 and the center of the second inner circle 1219 are located on the axis of the ejection medium suction mixing element 121.
For example, the ejection medium component 122 has eight ejection medium branch pipes 1223, where (the centers or the centers of) the outlet ends of four ejection medium branch pipes 1223 are all located on the first inner circle 1218, and (the centers or the centers of) the outlet ends of the other four ejection medium branch pipes 1223 are all located on the second inner circle 1219, and a concentric circle is formed between the first inner circle 1218 and the second inner circle 1219, as shown in fig. 6.
In this embodiment, both the plane of the first inner circle 1218 and the plane of the second inner circle 1219 are perpendicular to the axis of the injected medium suction mixing element 121, and the distance from the first inner circle 1218 to the outlet end of the injected medium suction mixing element 121 is equal to the distance from the second inner circle 1219 to the outlet end of the injected medium suction mixing element 121, or the distance from the first inner circle 1218 to the outlet end of the injected medium suction mixing element 121 is smaller than the distance from the second inner circle 1219 to the outlet end of the injected medium suction mixing element 121, as shown in fig. 8, or the distance from the first inner circle 1218 to the outlet end of the injected medium suction mixing element 121 is larger than the distance from the second inner circle 1219 to the outlet end of the injected medium suction mixing element 121, as shown in fig. 9.
In this embodiment, the injected medium suction mixing component 121 includes an injected medium inlet section 1211, an inlet expansion section 1212, an inlet section 1213, a diameter reduction section 1214, a mixing section 1215, an diameter expansion section 1216, and an outlet section 1217, which are sequentially arranged along the axial direction, the inlet section 1213 is provided with a purge port 12110 and a first pressure measurement port 12111, the outlet section 1217 is provided with a relief port 12113 and a second pressure measurement port 12114, and the diameter reduction section 1214 and the diameter expansion section 1216 are provided with lifting lugs 12112.
In this embodiment, an ejection medium nozzle 1224 is provided at an outlet of the ejection medium branch pipe 1223, and the ejection medium nozzle 1224 includes an ejection medium inner introduction section 12241, an ejection medium inner contraction section 12242, and an ejection medium inner diffusion section 12243, which are sequentially provided along the axial direction, as shown in fig. 10. It is understood that the ejection medium nozzle 1224 is a part of the ejection medium branch pipe 1223, and the outlet end of the ejection medium nozzle 1224 is the outlet end of the ejection medium branch pipe 1223.
The working process of the multi-nozzle composite injection device is described as follows:
high-pressure injection media (for example, 300KPa) enter the multi-nozzle compound injector from the injection media inlet end a, low-pressure injected media (for example, 15KPa) enter the multi-nozzle compound injector from the injected media inlet end b, and the high-pressure injection media and the low-pressure injected media are mixed and then discharged from the mixed media outlet end c. The multi-nozzle combined type ejector has a good ejection function, the ejection function is realized by using an ejection medium with not very high pressure, and the blast furnace charge tank in a low-pressure state can smoothly recover the diffused coal gas to a high-pressure clean coal gas pipe network, so that the ejection function can be realized without extra energy.
The remaining features of this embodiment may be the same as those of embodiment 1, and this embodiment will not be described in detail for the sake of brevity.
Example 3
The embodiment is an improvement of the embodiment 2, and the main difference between the embodiment and the embodiment 2 is that in the multi-nozzle composite injection device, the outlet end of the branch injection medium branch pipe 1223 located on the first inner circle 1218 can eject a medium flow advancing spirally, or the outlet end of the branch injection medium branch pipe 1223 located on the second inner circle 1219 can eject a medium flow advancing spirally.
In this embodiment, an included angle α between the injection direction of the rotary injection medium branch pipe 1223 and the axial direction of the injection medium sucked into the mixing part 121 may be 15 ° to 45 ° (e.g., 30 °), as shown in fig. 12, and an included angle β between the injection direction of the rotary injection medium branch pipe 1223 and the diameter direction of the injection medium sucked into the mixing part 121 may be 15 ° to 45 ° (e.g., 30 °), as shown in fig. 11. Along the spraying direction of the rotary spraying injection medium branch pipe 1223, the distance between the rotary spraying injection medium branch pipe 1223 and the axis of the injected medium sucked into the mixing component 121 can be gradually reduced.
In this embodiment, the medium flow that jet medium branch pipe 1223 erupted is penetrated in the jet can the spiral advance, and jet medium can be to being penetrated the medium and producing rotatory cutting mixing effect, so not only can realize not needing extra energy just can realize the function of penetrating of low pressure medium, can also realize penetrating the medium and being penetrated the more even mixture of medium.
The remaining features of this embodiment may be the same as those of embodiment 2, and this embodiment will not be described in detail for the sake of brevity.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and technical scheme, technical scheme and the technical scheme all can the independent assortment use.
Claims (10)
1. The utility model provides a parallelly connected voltage-sharing diffuses coal gas full recovery system, a serial communication port, parallelly connected voltage-sharing diffuses coal gas full recovery system is including the one-level dust remover (4), coal gas recovery pipeline mechanism and second grade dust remover (24) that connect gradually, this coal gas recovery pipeline mechanism contains parallelly connected natural pressure difference of setting and retrieves passageway (29) with injection apparatus, injection apparatus retrieves passageway (29) and contains suction line (30), injection apparatus (12) and mixing output pipeline (31) that connect gradually, injection apparatus (12) contain a plurality of ejectors, one-level dust remover (4) combustion gas can get into in second grade dust remover (24) through this coal gas recovery pipeline mechanism.
2. The parallel pressure-equalizing bleeding gas full-recovery system according to claim 1, wherein the ejector (12) comprises a jet inlet (1204), a suction inlet (1205) and a mixture outlet (1206), one end of the suction line (30) is connected with the suction inlet (1205) of the ejector (12), one end of the mixing output line (31) is connected with the mixture outlet (1206) of the ejector (12), and the jet inlet (1204) of the ejector (12) is externally connected with a jet supply line (32).
3. The parallel pressure-equalizing diffused gas full recovery system according to claim 2, wherein one end of the natural pressure difference recovery passage (28) is connected to the first outlet of the primary dust remover (4), the other end of the natural pressure difference recovery passage (28) is connected to the inlet of the secondary dust remover (24), the other end of the suction line (30) and the other end of the mixing output line (31) are both connected to the natural pressure difference recovery passage (28), and the other end of the mixing output line (31) is located between the other end of the suction line (30) and the natural pressure difference recovery passage (28).
4. The parallel pressure-equalizing bleeding gas full-recovery system according to claim 2, wherein the ejector (12) comprises a first ejector (1201) and a second ejector (1202), the injection inlet of the first ejector (1201) is the injection inlet (1204) of the ejector (12), the suction inlet of the first ejector (1201) is the suction inlet (1205) of the ejector (12), the mixing outlet of the second ejector (1202) is the mixture outlet (1206) of the ejector (12), the injection inlet of the first ejector (1201) is communicated with the injection inlet of the second ejector (1202) through a first branch line (1207), and the mixing outlet of the first ejector (1201) is communicated with the suction inlet of the second ejector (1202) through a second branch line (1208).
5. The parallel pressure-equalizing diffused gas full-recovery system according to claim 2, wherein the ejector (12) comprises a first ejector (1201), a second ejector (1202) and a third ejector (1203), the injection inlet of the first ejector (1201) is the jet inlet (1204) of the ejector (12), the suction inlet of the first ejector (1201) is the suction inlet (1205) of the ejector (12), the mixing outlet of the third ejector (1203) is the mixture outlet (1206) of the ejector (12), the injection inlet of the first ejector (1201) is communicated with the injection inlet of the second ejector (1202) through a first branch (1207), the mixing outlet of the first ejector (1201) is communicated with the suction inlet of the second ejector (1202) through a second branch (1208), the injection inlet of the second ejector (1202) is communicated with the injection inlet of the third ejector (1203) through a third branch (1209), the mixing outlet of the second ejector (1202) is communicated with the suction inlet of the third ejector (1203) through a fourth branch line (12010).
6. The parallel pressure-equalizing blow-off gas full recovery system according to claim 1, wherein at least one of the plurality of ejectors is a multi-nozzle compound ejector;
the multi-nozzle combined type injection device comprises an injected medium suction mixing component (121) and an injection medium component (122), the injected medium suction mixing component (121) is of a cylindrical structure, the injection medium component (122) comprises an injection medium main pipe (1221), an injection medium ring pipe (1222) and a plurality of injection medium branch pipes (1223) which are sequentially arranged, the outlet ends of the plurality of injection medium branch pipes (1223) are all located in the injected medium suction mixing component (121), and the outlet ends of the injection medium branch pipes (1223) face the outlet end of the injected medium suction mixing component (121);
an inlet of the injection medium sucked mixing part (121) is a suction inlet of the ejector, an outlet of the injection medium sucked mixing part (121) is a mixing outlet of the ejector, and an inlet of the injection medium part (122) is an injection inlet of the ejector;
the plurality of ejecting medium branch pipes (1223) are arranged at intervals along the circumferential direction of the ejecting medium sucking and mixing component (121), and the distances from the outlet ends of the plurality of ejecting medium branch pipes (1223) to the axis of the ejecting medium sucking and mixing component (121) are alternately arranged far and near.
7. The parallel pressure-equalizing bleeding gas full-recovery system according to claim 6, wherein the outlet ends of some of the plurality of injection medium branch pipes (1223) are all located on a first inner circle (1218), the outlet ends of another some of the plurality of injection medium branch pipes (1223) are all located on a second inner circle (1219), the diameter of the first inner circle (1218) is smaller than that of the second inner circle (1219), and the center of circle of the first inner circle (1218) and the center of circle of the second inner circle (1219) are both located on the axis of the injection medium suction mixing element (121).
8. The parallel pressure-equalizing bleeding gas full recovery system according to claim 7, wherein the plane of the first inner circle (1218) and the plane of the second inner circle (1219) are both perpendicular to the axis of the injected medium suction mixing element (121), and the distance from the first inner circle (1218) to the outlet end of the injected medium suction mixing element (121) is smaller than or greater than the distance from the second inner circle (1219) to the outlet end of the injected medium suction mixing element (121).
9. The parallel pressure equalizing and bleeding coal gas full recovery system according to claim 7, characterized in that the outlet end of the injection medium branch pipe (1223) located on the first inner circle (1218) can eject the medium flow advancing spirally, or the outlet end of the injection medium branch pipe (1223) located on the second inner circle (1219) can eject the medium flow advancing spirally.
10. The parallel pressure-equalizing bleeding gas full recovery system according to claim 6, characterized in that the injected medium suction mixing element (121) comprises an injected medium inlet section (1211), an inlet expansion section (1212), an introduction section (1213), a diameter reduction section (1214), a mixing section (1215), an diameter expansion section (1216) and a lead-out section (1217) which are sequentially arranged along the axial direction, wherein the introduction section (1213) is provided with a purge port (12110) and a first pressure measurement port (12111), the lead-out section (1217) is provided with a diffusion port (12113) and a second pressure measurement port (12114), and the diameter reduction section (1214) and the diameter expansion section (1216) are provided with lifting lugs (12112);
an ejection medium nozzle (1224) is arranged at an outlet of the ejection medium branch pipe (1223), and an ejection medium inner introduction section (12241), an ejection medium inner contraction section (12242) and an ejection medium inner diffusion section (12243) which are sequentially arranged along the axial direction are arranged in the ejection medium nozzle (1224).
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| CN113151626A (en) * | 2021-05-17 | 2021-07-23 | 中冶京诚工程技术有限公司 | Parallelly connected voltage-sharing diffuses full recovery system of coal gas |
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