CN212476808U - Coal gas distribution and utilization system in smelting reduction process - Google Patents
Coal gas distribution and utilization system in smelting reduction process Download PDFInfo
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- CN212476808U CN212476808U CN202020948444.9U CN202020948444U CN212476808U CN 212476808 U CN212476808 U CN 212476808U CN 202020948444 U CN202020948444 U CN 202020948444U CN 212476808 U CN212476808 U CN 212476808U
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- 239000003034 coal gas Substances 0.000 title claims abstract description 56
- 238000009826 distribution Methods 0.000 title claims abstract description 34
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- 238000011946 reduction process Methods 0.000 title claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 19
- 238000010248 power generation Methods 0.000 claims abstract description 19
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000010079 rubber tapping Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 133
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
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- 229910052751 metal Inorganic materials 0.000 description 6
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
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Abstract
A coal gas distribution and utilization system in a smelting reduction process relates to the technical field of smelting reduction coal gas distribution modes, and comprises a smelting reduction furnace (SRV furnace), wherein the SRV furnace is provided with a hot blast furnace system, a waste heat power generation system, a preheating pre-reduction rotary kiln system and a coal powder preparation system in a tapping mode; and flue gas after the waste heat power generation system and the hot blast stove system are combusted is returned to the pulverized coal preparation system. The utility model provides an during the actual production uses among the conventional art, SRV coal gas only supplies with buggy preparation, hot-blast furnace, the three user of drying kiln, can't guarantee effective utilization of coal gas, and adjust the distribution in real time and can't guarantee the steady operation's of coal gas distribution system problem according to output.
Description
Technical Field
The utility model relates to a melting reduction coal gas distribution mode technical field, concretely relates to melting reduction process coal gas distribution utilizes system.
Background
The HIsmelt reduction iron-making process is one of smelting reduction metallurgy technologies which realize industrial production, is the only smelting reduction metallurgy new technology which does not use coke and sinter at present, and belongs to the leading-edge technology of the current metallurgy field. The Hismelt smelting iron-making process technology utilizes non-coking coal powder and iron ore powder to produce liquid pig iron by adopting a jet metallurgy mode, has short flow, little pollution and good molten iron quality, and is an advanced iron-making technology for solving the problems of limited coking coal resources and environmental protection in China.
The Chinese national intellectual property office discloses a technical scheme with application number 201910808638.0, which comprises a vaporization flue, a cyclone dust collector, a waste heat boiler, a bag-type dust collector and a pressure regulating valve group which are sequentially connected, wherein the outlet of the pressure regulating valve group is respectively connected with a pulverized coal preparation instrument, a hot blast stove and a drying kiln, and the inlet of the vaporization flue is connected with a melting reduction furnace. The internal recycling in the whole process is realized. The physical sensible heat of the high-temperature coal gas is fully utilized, and the chemical heat of the coal gas is fully released, so that the energy consumption of the whole process is greatly reduced, and the purposes of energy conservation and consumption reduction are realized.
The scheme is an initial design scheme of a HIsmelt process flue gas system, but the scheme gradually exposes the defects along with the use, and problems often occur;
the scheme introduces a coal gas distribution principle in a smelting reduction process in a general way, and according to the distribution principle, when the SRV coal gas is used in actual production, the SRV coal gas is only supplied to three users, namely a coal powder preparation user, a hot blast stove user and a drying kiln user, so that the effective utilization and distribution of the coal gas cannot be ensured, and the stable operation of a coal gas distribution system cannot be ensured.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides a melting reduction process coal gas distribution utilizes system for when solving actual production in the conventional art and using, SRV coal gas only supplies with buggy preparation, hot-blast furnace, the three user of drying kiln, can't guarantee the effective utilization of coal gas, and can't guarantee the problem of gas distribution system's steady operation.
In order to achieve the above object, the utility model provides a following technical scheme:
a coal gas distribution and utilization system in a smelting reduction process comprises an SRV furnace, wherein a hot blast furnace system, a waste heat power generation system, a preheating pre-reduction rotary kiln system and a coal powder preparation system are connected to the SRV furnace in a tapping mode; and the waste heat power generation system and the flue gas combusted by the hot blast stove system are returned to the pulverized coal preparation system.
As an optimized scheme, the hot blast stove system comprises a first main pipe connected with the SRV stove, the first main pipe is respectively connected with three hot blast stoves through first branch pipes, and the first main pipe is also connected with a flue gas generating furnace in parallel through branch pipes.
As an optimized scheme, a gas main pipe shut-off valve, a first TE temperature measuring instrument, a first PT pressure measuring instrument, a first FT flow measuring instrument, a gas heat exchanger, a gas bypass shut-off valve and a second TE temperature measuring instrument are sequentially connected to the first main pipe along the material conveying direction.
As an optimized scheme, the branch pipe is sequentially connected with a gas stop valve, a gas flow regulating valve and the flue gas generator along the material conveying direction, and the flue gas generator is also connected with the gas heat exchanger.
As an optimized scheme, a coal gas preheating inlet stop valve and a coal gas preheating outlet stop valve are connected to the coal gas heat exchanger, and the coal gas bypass stop valve is located between the coal gas preheating inlet stop valve and the coal gas preheating outlet stop valve.
As an optimized scheme, the first branch pipe is also sequentially connected with a flow regulating valve, a first gas stop valve, a second FT flow measuring instrument and a gas combustion valve along the conveying direction.
As an optimized scheme, the waste heat power generation system comprises a second main pipe connected with the SRV furnace, and the second main pipe is respectively connected with eight combustors through second branch pipes.
As an optimized scheme, the second main pipe is sequentially connected with a third TE temperature measuring instrument, a second PT pressure measuring instrument, a third FT flow measuring instrument, a first pressure regulating valve and a second pressure regulating valve which are connected in parallel along the material conveying direction.
As an optimized scheme, the second branch pipe is connected to an area between the third FT flow measuring instrument and the first pressure regulating valve, and the second branch pipe is sequentially connected with a pneumatic regulating valve, a first pneumatic quick cut-off valve, a third PT pressure measuring instrument and a second pneumatic quick cut-off valve along the conveying direction.
As an optimized scheme, the pulverized coal preparation system comprises a third main pipe connected with the SRV furnace, and the third main pipe is connected with a pulverized coal preparation heating furnace.
As an optimized scheme, the third main pipe is sequentially connected with a second gas stop valve, a fourth FT flow measuring instrument, a fourth TE temperature measuring instrument, a fourth PT pressure measuring instrument and a gas flow regulating valve along the material conveying direction.
As an optimized scheme, the preheating and pre-reducing rotary kiln system comprises a fourth main pipe connected with the SRV furnace, and the fourth main pipe is connected with the preheating and pre-reducing rotary kiln through a third branch pipe.
As an optimized scheme, the fourth main pipe is sequentially connected with an AT gas analyzer, a pneumatic quick cut-off valve, an electric blind plate valve, a pneumatic regulating valve, a fifth PT pressure measuring instrument, a fifth FT flow measuring instrument, an explosion-proof valve and a bleeding valve along the conveying direction.
As an optimized scheme, the third branch pipe is connected between the fifth FT flow meter and the explosion-proof valve, and the third branch pipe is further connected with a manual regulating valve.
Compared with the prior art, the beneficial effects of the utility model are that:
SRV (continuous steam turbine) coal gas users are designed and added, and on the basis of supplying the coal gas to a hot blast stove system, a coal powder preparation system and a preheating pre-reduction system, waste heat of the users is added for power generation, and online power generation is carried out, so that the coal gas is fully and reasonably utilized, and the production cost is effectively reduced;
designing a gas automatic distribution system and a device, wherein each user designs a detailed gas conveying pipeline and the model selection specification of related equipment instruments;
reasonably and quantitatively distributing the generated gas quantity of the SRV furnace and the gas use quantity of each user;
the whole automatic coal gas distribution system is controlled by a cross-river DCS system, the automation degree is high, and the coal gas distribution of each system is dynamically adjusted according to the coal gas yield change of the smelting reduction furnace;
the stability in the working process is improved; the parts are few, the working procedure is simple and convenient, and the failure rate is low; the structure is simple, and the service life is long; simple and convenient operation and control, easy large-scale manufacture and installation and wide application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the hot blast stove system of the present invention;
fig. 3 is a schematic structural diagram of the waste heat power generation system of the present invention;
FIG. 4 is a schematic structural view of a pulverized coal preparation system according to the present invention;
FIG. 5 is a schematic structural view of the system of the pre-heating and pre-reducing rotary kiln of the present invention;
in the figure: 1-gas main pipe shut-off valve; 2-a first TE temperature measuring instrument; 3-a first PT pressure gauge; 4-a first FT flow meter; 5-gas preheating inlet cut-off valve; 6-gas preheating outlet cut-off valve; 7-a gas bypass cut-off valve; 8-a second TE temperature measuring instrument; 9-a flow regulating valve; 10-a first gas shut-off valve; 11-a second FT flow meter; 12-gas combustion valve; 13-gas cut-off valve; 14-gas flow regulating valve; 15-third TE temperature measuring instrument; 16-a second PT pressure gauge; 17-a third FT flow meter; 18-pneumatic regulating valve; 19-a first pneumatic quick cut-off valve; 20-a second pneumatic quick cut-off valve; 21-a third PT pressure gauge; 22-a first pressure regulating valve; 23-a second pressure regulating valve; 24-a hot blast stove system; 25-a waste heat power generation system; 26-a pulverized coal preparation system; 27-preheating the pre-reduction rotary kiln system; 28-SRV furnace; 29-a flue gas producer; 30-a second gas shut-off valve; 31-fourth FT flow meter; 32-fourth TE temperature measuring instrument; 33-gas flow regulating valve; 34-AT gas analyzer; 35-a pneumatic quick cut-off valve; 36-electric blind plate valves; 37-pneumatic regulating valve; 38-fifth PT pressure gauge; 39-fifth FT flow meter; 40-manual regulating valve; 41-explosion-proof valve; 42-a bleed valve; 43-hot blast stove; 44-a boiler; 45-pulverized coal preparation heating furnace; 46-preheating the prereduction rotary kiln.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 5, the coal gas distribution and utilization system in the smelting reduction process comprises an SRV furnace 28, wherein the SRV furnace 28 is connected with a hot blast furnace system 24, a waste heat power generation system 25, a preheating pre-reduction rotary kiln system 27 and a coal powder preparation system 26; flue gas after the waste heat power generation system 25 and the hot blast stove system 24 are combusted is returned to the coal powder preparation system 26.
The gas production quantity of the SRV furnace 28 during normal production is 200000-400000Nm3/h, the hot blast furnace system 24 is distributed with 70000-120000Nm3/h through the automatic molten reduction gas distribution system and device, the power generation system combustion boiler 44 is distributed with 80000-200000Nm3/h, the preheating pre-reduction system rotary kiln is distributed with 30000-50000Nm3/h, and the coal powder preparation system heating furnace 28 is distributed with 10000-20000Nm3/h, so that the normal production requirements of downstream users are met.
The hot blast stove system 24 comprises a first main pipe connected with the SRV stove 28, the first main pipe is respectively connected with three hot blast stoves 43 through first branch pipes, the first main pipe is also connected with a flue gas generating furnace 29 in parallel through branch pipes, and the generated high-temperature flue gas enters a gas heat exchanger to preheat the gas.
The first main pipe is sequentially connected with a gas main pipe shut-off valve 1, a first TE temperature measuring instrument, a first PT pressure measuring instrument, a first FT flow measuring instrument, a gas heat exchanger, a gas bypass shut-off valve 7 and a second TE temperature measuring instrument along the material conveying direction.
The branch pipe is sequentially connected with a gas shut-off valve 13, a gas flow regulating valve and a flue gas generating furnace 29 along the conveying direction, and the flue gas generating furnace 29 is also connected with a gas heat exchanger.
The coal gas heat exchanger is connected with a coal gas preheating inlet cut-off valve 5 and a coal gas preheating outlet cut-off valve 6, and the coal gas bypass cut-off valve 7 is positioned between the coal gas preheating inlet cut-off valve 5 and the coal gas preheating outlet cut-off valve 6.
The first branch pipe is also sequentially connected with a flow regulating valve 9, a first gas cut-off valve 10, a second FT flow measuring instrument and a gas combustion valve 12 along the material conveying direction.
The cogeneration system 25 comprises a second main pipe connected to the SRV furnace 28, and the second main pipe is connected with eight burners through second branch pipes, wherein the eight burners are located in one boiler 44.
The second main pipe is sequentially connected with a third TE temperature measuring instrument, a second PT pressure measuring instrument, a third FT flow measuring instrument, a first pressure regulating valve 22 and a second pressure regulating valve 23 which are connected in parallel along the material conveying direction.
The second branch pipe is connected to the area between the third FT flow meter and the first pressure regulating valve 22, and the second branch pipe is sequentially connected with a pneumatic regulating valve, a first pneumatic quick cut-off valve 19, a third PT pressure meter and a second pneumatic quick cut-off valve 20 along the conveying direction.
The pulverized coal preparation system 26 includes a third main pipe connected to the SRV furnace 28, and the third main pipe is connected to a pulverized coal preparation heating furnace 45.
The third main pipe is sequentially connected with a second gas cut-off valve 30, a fourth FT flow measuring instrument, a fourth TE temperature measuring instrument, a fourth PT pressure measuring instrument and a gas flow regulating valve along the material conveying direction.
The pre-heating pre-reduction rotary kiln system 27 comprises a fourth main pipe connected with the SRV furnace 28, and the fourth main pipe is connected with a pre-heating pre-reduction rotary kiln 46 through a third branch pipe.
An AT gas analyzer 34, a pneumatic quick cut-off valve 35, an electric blind plate valve 36, a pneumatic regulating valve, a fifth PT pressure measuring instrument, a fifth FT flow measuring instrument, an explosion-proof valve 41 and a bleeding valve 42 are sequentially connected to the fourth main pipe along the conveying direction.
The third branch pipe is connected between the fifth FT flow meter and the explosion-proof valve 41, and the third branch pipe is also connected with a manual adjustment valve 40.
The specific operation process is as follows:
referring to the attached drawing 1 in detail, the coal gas generated by the SRV furnace is divided into 4 paths after being processed in multiple stages and is respectively distributed to a waste heat power generation furnace, a hot blast furnace, a preheating pre-reduction rotary kiln and a coal powder preparation heating furnace. High-temperature flue gas generated after waste heat power generation and hot blast stove gas combustion is conveyed into a coal grinding machine of a pulverized coal preparation system through a flue gas conveying pipeline, and reutilization of the flue gas is realized.
The gas production amount of the SRV furnace during normal production is 200000-400000Nm3H, realizing the distribution of 70000-120000Nm hot blast stove system by a melting reduction gas automatic distribution system and a device3Distribution of combustion boilers of power generation system 80000 and 200000Nm330000-50000Nm for rotary kiln distribution of preheating pre-reduction system310000-20000Nm distributed by heating furnace of pulverized coal preparation system3And h, meeting the normal production requirements of downstream users.
The attached figure 2 is a gas conveying control flow of the hot blast stove, a small part of gas generated by the SRV furnace enters the flue gas generating furnace for combustion through a gas stop valve 13 and a gas flow regulating valve 14, and generated high-temperature flue gas enters a gas heat exchanger for gas preheating.
The coal gas in the main pipe enters the coal gas heat exchanger for preheating through the coal gas main pipe stop valve 1 and the coal gas preheating inlet stop valve 5, and the coal gas can be preheated to 200-. The preheated gas temperature and the gas flow regulating valve 14 have interlocking control, the valve opening of the regulating valve is automatically regulated, the preheated gas temperature is kept stable, and the gas bypass cut-off valve 7 is kept in a closed state normally.
Coal gas enters 3 groups of gas branch pipes of the hot blast stove through a preheating outlet cut-off valve 6, the hot blast stove adopts a mode of two-burning and one-feeding when in normal use, taking a No. 1 hot blast stove as an example, the coal gas on the gas branch pipes enters a burner of the hot blast stove through a flow regulating valve 9, a gas cut-off valve 10 and a gas combustion valve 12 to be burned. Meanwhile, an inlet gas temperature TE measuring device 2, a pressure PT measuring device 3, a flow FT measuring device 4 and a preheated gas temperature TE measuring device 8 are respectively arranged on the gas main pipe, and a flow FT measuring device 11 is respectively arranged on each branch pipe.
The pipe diameter of the main gas pipe is DN1600, the pipe diameter of the branch gas pipe is DN1200, and various corrugated compensators are arranged on the main gas pipe and the branch gas pipe to prevent the welding point from cracking caused by thermal expansion of the pipes.
The gas main pipe shut-off valve 1, the gas preheating inlet shut-off valve 5, the preheating outlet shut-off valve 6 and the gas bypass shut-off valve 7 all adopt metal hard seal butterfly valves, specifications: D940H, DN1600, transmission mode: and (4) electrically driving.
The specification of the gas cut-off valve 10 is Z741Y, the specification of the gas combustion valve 12 is D740H-6, the transmission modes of the two valves are hydraulic transmission, the structural style adopts an exposed rod wedge type single gate valve, and a guide groove and a wedge-shaped sliding block are arranged in the valve. The valve plate drive adopts a common oil cylinder to drive a chain and a chain wheel to carry out closed transmission; the oil cylinder piston is sealed by V-shaped clamping cloth. The oil cylinder piston rod catcher adopts a catcher with a locking screw and a joint bearing. The valve rod and the valve setting body adopt a floating sealing technology, and an inductance type proximity switch is arranged on the valve frame to control the stroke of the valve plate.
The gas cut-off valve 13 adopts a pneumatic three-eccentric quick cut-off valve, and is provided with a flame-proof limit switch and a valve plate: carbon steel, valve body: the metal is sealed hard, the explosion-proof electromagnetic valve (24V power supply) is powered off, the gas is cut off when the power is cut off, the gas pipeline can be cut off quickly, and the cutting-off time is within 5 seconds.
FIG. 3 is a waste heat power generation coal gas conveying control flow, and coal gas generated by an SRV furnace is divided into 8 same branches after being controlled by a coal gas main pipe, and the branches are respectively distributed to the upper A to the lower D, and 8 groups of same combustors are used for combustion.
2.1 the pipe diameter of the main gas pipe is D1800 multiplied by 10, and the main pipe is provided with a pneumatic quick cut-off valve and a pressure, temperature and flow measuring instrument device.
The pneumatic quick cut-off valve (switch type with handle, explosion-proof limit switch, valve plate: carbon steel, valve body: metal hard seal, 24V power supply of explosion-proof electromagnetic valve, power-off and gas-off valve) can cut off the main pipe gas quickly within 5 seconds.
The TE temperature measuring instrument 15 adopts a wear-resistant platinum thermal resistor Pt100, and has the following total length/insertion depth: l/i (mm) ═ 650/500, Φ 16, fixed threaded tapered tube M33 × 2, protective tube 316, gauge pressure 20Pa, and gas temperature in the main tube was measured.
The PT pressure measuring instrument 16 adopts an explosion-proof pressure transmitter, and the measuring range is as follows: 0-20KPa, and outputting: 4-20mA, and measuring the gas pressure in the main pipe.
The FT flow measuring instrument 17 adopts a bar-type flowmeter matched explosion-proof differential pressure transmitter, and the measuring range is as follows: 80000 + 200000Nm3H, output: 4-20mA, with HART protocol and digital display meter, to measure the gas flow in the main pipe.
2.2 the pipe diameter of the gas branch pipe is D600 multiplied by 8, and each branch pipe is respectively provided with 2 pneumatic quick shut-off valves, pneumatic regulating valves and pressure measuring instrument devices in front of the burner. The following group B burner gas branch pipes are taken as examples:
pneumatic quick cut-off valve 19, 20 all are D630 x 8, take flame proof limit switch, valve plate: carbon steel, valve body: the metal is sealed hard, the explosion-proof electromagnetic valve (24V power supply) is powered off, the gas is cut off when the power is cut off, the gas of the branch pipe can be cut off rapidly, and the cutting-off time is within 5 seconds.
The PT pressure measuring instrument 21 adopts an explosion-proof pressure transmitter, and the measuring range is as follows: 0-20KPa, and outputting: 4-20mA, and measuring the gas pressure in the branch pipe.
2.3 main pipe gas pressure regulation
The design requirement of the main pipe gas pressure is 0-20KPa, the main pipe gas pressure is adjusted by connecting two gas pipelines to a gas diffusing device, pressure adjusting valves are respectively arranged on the two branch pipes, wherein the pressure adjusting valve 22 is provided with a straight stroke electric-pneumatic valve positioner, the pipe diameter of the pipeline is D350 multiplied by 8, and the micro-adjustment of the main pipe gas pressure is realized by the linkage control of a DCS system; the pressure regulating valve 23 is provided with a straight-stroke electro-pneumatic valve positioner, the pipe diameter of the pipeline is D800 multiplied by 8, and the large-range rapid adjustment of the main pipe pressure is realized through DCS system interlocking control.
FIG. 4 is a coal gas conveying control flow of a heating furnace of a pulverized coal preparation system, wherein coal gas generated by an SRV furnace enters a pulverized coal preparation heating furnace from a coal gas pipeline for combustion after being regulated by a coal gas stop valve and a coal gas flow regulating valve. The gas pipeline is respectively provided with a temperature, pressure and flow measuring instrument device.
The pipe diameter of the gas pipeline is D600 multiplied by 8, the gas cut-off valve 30 adopts a pneumatic three-eccentric quick cut-off valve and is provided with an explosion-proof limit switch and a valve plate: carbon steel, valve body: the metal is sealed firmly, the explosion-proof electromagnetic valve (24V power supply) is powered off, the gas is cut off when the power is cut off, the gas pipeline can be cut off quickly, and the cutting-off time is within 3 seconds.
The gas flow control valve 33 adopts a pneumatic control butterfly valve (gas explosion suppression), and the operation temperature is as follows: 40 ℃, flow rate: 0 to 20000Nm3H, pre-valve pressure: 25KPa, pressure after valve: 8KPa, a pneumatic actuator, an electric-air valve positioner and 4-20MA valve position feedback.
The FT flow meter 31 employs a differential pressure transmitter (gas explosion suppression), and the range: 10000-20000Nm3H, output: 4-20mA, with HART protocol and digital display meter, to measure the gas flow.
The TE temperature measuring instrument 32 employs a wear-resistant platinum thermistor Pt100, overall length/insertion depth: and L/Imm is 500/350, phi 16, and the output of the fixed thread taper pipe M27 multiplied by 2, 4-20mA is measured for the gas temperature.
PT pressure measurement instrument 21 adopts flame-proof type pressure transmitter, and the direct mount formula, the range: 0-30KPa, power supply: 24VDC, output: 4-20mA, and measuring the gas pressure in the branch pipe.
FIG. 5 shows a rotary kiln gas delivery control flow of the pre-heating and pre-reducing system, wherein gas generated by the SRV furnace enters a burner at the kiln head of the pre-heating and pre-reducing rotary kiln for combustion through a pneumatic quick cut-off valve 35, an electric blind plate valve 36, a pneumatic regulating valve 37 and a manual regulating valve 40, so that iron ore powder is pre-heated and pre-reduced. The gas transmission pipeline is provided with a gas analyzer AT34, a pressure PT measuring device 38, a gas flow measuring device 39, an explosion-proof valve 41 and a relief valve 42.
The pipe diameter of the main gas pipe is DN 800X 8, the specification of the pneumatic quick cut-off valve 35 is DN 800X 8, and the main gas pipe is provided with an explosion-proof limit switch and a valve plate: carbon steel, valve body: the metal is sealed hard, the explosion-proof electromagnetic valve (24V power supply) is powered off, the gas is cut off when the power is cut off, the main pipe gas can be cut off quickly, and the cutting-off time is within 5 seconds.
The electric blind plate valve 36 adopts an electric double-layer air-locking flap valve with the specification of 800 multiplied by 800 and the throughput of 100000Nm3H, motor power: 0.37 KW.
Range of the pneumatic control valve 37: 10000 + 60000Nm3And h, a valve positioner is arranged.
The gas analyzer AT34 is a CO gas analyzer for detecting CO concentration, and the measuring range is as follows: 0 to 50 percent
The pressure PT measuring device 38 adopts an explosion-proof pressure transmitter, and is directly installed, and the measuring range is as follows: 0-50KPa, power supply: 24VDC, output: 4-20mA, and measuring the gas pressure in the branch pipe.
The gas flow measuring device 39 adopts a thermal mass type gas flow meter, and the measuring range is as follows: 10000 + 60000Nm3/h。
The manual regulating valve 40 is a manual regulating gate valve and is used for controlling the gas inlet amount of a burner at the kiln head of the rotary kiln.
The explosion-proof valve 41 is internally provided with an explosion-proof sheet to prevent air from entering a gas pipeline from a diffusing pipeline and exploding when encountering open fire.
The pipe diameter DN350 of the bleeding valve 42 requires that the bleeding pipeline exceeds 2000mm of the factory building.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. A coal gas distribution and utilization system in a smelting reduction process is characterized in that: the system comprises an SRV furnace (28), wherein a hot blast furnace system (24), a waste heat power generation system (25), a preheating pre-reduction rotary kiln system (27) and a coal powder preparation system (26) are connected to the SRV furnace (28) in a tapping mode; and flue gas generated after the waste heat power generation system (25) and the hot blast stove system (24) are combusted is returned to the coal powder preparation system (26).
2. The smelting reduction process gas distribution utilization system according to claim 1, wherein: the hot blast stove system (24) comprises a first main pipe connected with the SRV stove (28), the first main pipe is respectively connected with three hot blast stoves (43) through first branch pipes, and the first main pipe is also connected with a flue gas generating furnace (29) in parallel through branch pipes.
3. The smelting reduction process gas distribution utilization system according to claim 2, characterized in that: the gas pipeline heat exchanger is characterized in that the first main pipe is sequentially connected with a gas main pipe shut-off valve (1), a first TE temperature measuring instrument (2), a first PT pressure measuring instrument (3), a first FT flow measuring instrument (4), a gas heat exchanger, a gas bypass shut-off valve (7) and a second TE temperature measuring instrument (8) along the material conveying direction.
4. The smelting reduction process gas distribution utilization system according to claim 1, wherein: the waste heat power generation system (25) comprises a second main pipe connected with the SRV furnace (28), and the second main pipe is respectively connected with eight combustors through second branch pipes.
5. The smelting reduction process gas distribution utilization system according to claim 4, wherein: the second main pipe is connected with a third TE temperature measuring instrument (15), a second PT pressure measuring instrument (16), a third FT flow measuring instrument (17), a first pressure regulating valve (22) and a second pressure regulating valve (23) which are connected in parallel in sequence along the material conveying direction.
6. The smelting reduction process gas distribution utilization system according to claim 1, wherein: the coal powder preparation system (26) comprises a third main pipe connected with the SRV furnace (28), and the third main pipe is connected with a coal powder preparation heating furnace (45).
7. The smelting reduction process gas distribution utilization system according to claim 6, wherein: and the third main pipe is sequentially connected with a second gas stop valve (30), a fourth FT flow measuring instrument (31), a fourth TE temperature measuring instrument (32), a fourth PT pressure measuring instrument and a gas flow regulating valve along the material conveying direction.
8. The smelting reduction process gas distribution utilization system according to claim 1, wherein: the preheating and pre-reducing rotary kiln system (27) comprises a fourth main pipe connected with the SRV furnace (28), and the fourth main pipe is connected with a preheating and pre-reducing rotary kiln (46) through a third branch pipe.
9. The smelting reduction process gas distribution utilization system according to claim 8, wherein: the fourth main pipe is sequentially connected with an AT gas analyzer (34), a pneumatic quick cut-off valve (35), an electric blind plate valve (36), a pneumatic regulating valve, a fifth PT pressure measuring instrument (38), a fifth FT flow measuring instrument (39), an explosion-proof valve (41) and a bleeding valve (42) along the conveying direction.
10. The smelting reduction process gas distribution utilization system according to claim 9, wherein: the third branch pipe is connected between the fifth FT flow measuring instrument (39) and the explosion-proof valve (41), and the third branch pipe is further connected with a manual regulating valve (40).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115418425A (en) * | 2022-09-28 | 2022-12-02 | 中冶南方都市环保工程技术股份有限公司 | Stable operation control method of multi-unit supercritical gas power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115418425A (en) * | 2022-09-28 | 2022-12-02 | 中冶南方都市环保工程技术股份有限公司 | Stable operation control method of multi-unit supercritical gas power generation system |
| CN115418425B (en) * | 2022-09-28 | 2023-09-29 | 中冶南方都市环保工程技术股份有限公司 | Stable operation control method of multi-unit supercritical gas power generation system |
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Assignee: Hebei Xinggang Technology Co.,Ltd. Assignor: SHANDONG MOLONG PETROLEUM MACHINERY Co.,Ltd. Contract record no.: X2023980034949 Denomination of utility model: A Gas Distribution and Utilization System for Melt Reduction Process Granted publication date: 20210205 License type: Common License Record date: 20230423 |
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