CN1175177C - Turbine generating process for one machine to recover waste gas energy from several blast furnaces - Google Patents
Turbine generating process for one machine to recover waste gas energy from several blast furnaces Download PDFInfo
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- CN1175177C CN1175177C CNB011065966A CN01106596A CN1175177C CN 1175177 C CN1175177 C CN 1175177C CN B011065966 A CNB011065966 A CN B011065966A CN 01106596 A CN01106596 A CN 01106596A CN 1175177 C CN1175177 C CN 1175177C
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Abstract
The present invention relates to a blast furnace gas residual pressure energy recovery and generation technology in which two or more blast furnaces share one turbo machine. Gas is educed from the backs of two or more blast furnace gas dust removal systems and the front of a pressure reducing valve group 8, and is converged after respectively passing through a corresponding inlet butterfly valve 6 and an inlet water sealing valve 5. The gas enter a turbo host 1 through a cut-off valve 3 to expand and generate power, and drives a generator group 2 to generate power. The gas enters a clean gas main pipe via an outlet water sealing valve 7 after coming out from the turbo host 1. A by-pass valve 4 is connected in parallel with an outlet pipeline and an inlet pipeline of the turbo host 1 which is in single out type. The turbo host 1 adopts a multi-stage axial-flow reaction type turbo; a host shell is horizontally splitted. The turbo host 1 adopts automatic full stator blade servo control, wherein the first stage of stator blades can be fully closed; the second stage of stator blades, the follow-up stator blades and the first stage of stator blades are automatically and synchronously regulated. Two valve plates are arranged in the inlet water sealing valve 5; water is filled between the two valve plates in a closed state. Technologic control hardware adopts a PLC programmable controller. The technology has the advantages of simple and convenient design and calculation, simple structure, small operation and maintenance amount, strong adaptability and stable and reliable operation.
Description
The present invention relates to the blast-furnace top gas recovery energy recovery electrification technique as well as of the shared turbine engine of a kind of two or more blast furnaces.
Blast-furnace top gas recovery energy recovery turbine power generation (being called for short TRT), it is the pressure difference of utilizing between blast furnace furnace roof and the gas main, blast furnace gas is imported turbine engine expansion acting, drive generator for electricity generation, thus the power-saving technology that will be on the reduction valve group can be reclaimed with the pressure reduction of noise and the consumption of heat energy form.Domestic-developed is promoted the use of TRT mainly at heat size 1260m
3More than, the blast furnace system of roof pressure 〉=150kpa, then main abroad Application and Development is at heat size 1500m
3More than, the blast furnace system of roof pressure 〉=150kpa.TRT technology both domestic and external is used the mainly corresponding TRT facility of corresponding configuration on the single seat blast furnace, and as singly advancing singly to go out the TRT technology of turbine main frame, the equipment manufacturing technology of this technology and control system, supplementary equipment are ripe, reliable.And the two stove universal type TRT technologies that propose at present both at home and abroad are mainly on the Application and Development of turbine main frame, as: the turbine main frame that goes with each other all the time, two stator blade adjustable types (2122 type); Twoly advance singly to go out the turbine main frame, two stator blade adjustable types (2121 type), perhaps two turbine main frame monomotor types (2211 type).These technologies all are confined in the design, manufacturing of turbine main frame, and turbine shafting of main engine designing and calculating complexity, complex structure, Operation and Maintenance amount are big, and do not have ripe operating experience, even require the volume of two stoves, roof pressure suitable substantially, thereby poor for applicability.
The objective of the invention is at domestic middle-size and small-size high pressure blast furnace quantity big, singly advance single removing from mould TRT manufacturing equipment manufacturing technology maturation, control system technical merit advanced person, the present situation of supplementary equipment mature and reliable, through combination and equipment improvement, the blast-furnace top gas recovery energy recovery turbine generating processs of the above shared machine of a kind of two stoves or two stoves is provided, realizes the coal gas energy recovery of many blast furnaces.
Realize that technical solution of the present invention is: the blast-furnace top gas recovery energy recovery turbine generating processs of the above shared machine of a kind of two stoves or two stoves, in two or more dedusting of blast furnace gas system back, before the reduction valve group, coal gas is drawn, respectively through compiling behind each self-corresponding inlet butterfly valve, the import water-sealing valve, enter the acting of expanding of turbine main frame by cut-off valve, and drive the generator set generating, pressure, the heat energy of coal gas is converted into electric energy.After coal gas comes out from the turbine main frame, through the outlet water-sealing valve or behind process outlet water-sealing valve, enter the purified gas house steward through butterfly valve again, at the export and import pipeline of turbine main frame bypass valve in parallel, the turbine main frame of coal gas turnover is for singly advancing single removing from mould, and the turbine main frame adopts the above axial flow reaction turbine of two-stage, the casing horizonally split, the control of full stator blade automatic servo is adopted in the control of turbine main frame, but first order stator blade contract fully wherein, and secondary and follow-up stator blade and one-level stator blade be adjustment synchronously automatically.In the import water-sealing valve, be provided with two valve plates, in off position, water-filling between two valve plates.The operation control of TRT and the furnace top pressure control hardware of blast furnace adopt the PLC programmable controller.The drainage pattern of high pressure gas pipeline adopts and disperses draining before the turbine main frame.
This process using ripe singly advance single removing from mould turbine main frame, designing and calculating is easy, simple in structure, the Operation and Maintenance amount is little.The full stator blade regulation range of turbine main frame is singly advanced the corresponding angle mobility scale that singly goes out the turbine main frame greater than common, so its variable working condition ability is strong, adapts to the shared special operation condition of many stoves and changes.The control hardware of the operation control of TRT, the control of blast furnace roof pressure and TRT inlet pressure (being turbine main frame inlet pressure) has adopted the PLC programmable controller, the system scan cycle is less than 100ms, working stability is reliable, device interrupt is powerful, make the control self-organizing system of every blast furnace top pressure, the single seat blast furnace can generate electricity separately, every blast furnace can generate electricity simultaneously, does not influence each reduction valve group to the roof pressure control of blast furnace separately.
Fig. 1 two stoves one machine blast-furnace top gas recovery energy recovery turbine generating processs flow chart
The TRT operation controlling party block diagram of the shared machine of Fig. 2 two stoves
Fig. 3 list blast furnace roof pressure is regulated skeleton diagram
Fig. 4 list blast furnace TRT inlet pressure is regulated skeleton diagram
Fig. 5 two-supremes furnace roof is pressed and is regulated skeleton diagram
Fig. 6 two blast furnace TRT inlet pressures are regulated skeleton diagram
The present invention is described further below in conjunction with accompanying drawing:
As Fig. 1: first, the blast-furnace top gas recovery recovery gas turbine electrification technique as well as of two shared machines of blast furnace of second, in first dedusting of blast furnace gas system back, before the reduction valve group 8 and second dedusting of blast furnace gas system back, before the reduction valve group 8, coal gas is drawn, pass through first respectively, the first inlet butterfly valve 6 that is provided with on the second blast furnace pipeline, first import water-sealing valve 5 and second inlet butterfly valve 6, compile behind the second import water-sealing valve 5, enter the 1 expansion acting of turbine main frame by cut-off valve 3, and drive generator set 2 generatings, pressure with coal gas, heat energy is converted into electric energy, after coal gas comes out from turbine main frame 1, enter the purified gas house steward through outlet water-sealing valve 7, at the export and import pipeline of turbine main frame 1 bypass valve 4 in parallel.The turbine main frame 1 of coal gas turnover is for singly advancing single removing from mould, turbine main frame 1 adopts the above axial flow reaction turbine of two-stage, the casing horizonally split, full stator blade automatic servo adjustable control is adopted in the control of turbine main frame 1, but first order stator blade contract fully wherein, secondary and follow-up stator blade and one-level stator blade are adjusted automatically synchronously.
Because the characteristics of the shared machine of two stoves, the selection configuration of its valve arrangement has tangible difference with single stove TRT technology, selected to have the inlet butterfly valve 6 of well-tuned characteristic and leakproofness, leakproofness requires to reach leakage test B level, and total travel actuation time was smaller or equal to 4 seconds.Be provided with two valve plates in the import water-sealing valve 5, in off position, water-filling sealing between two valve plates has the two way sealed ability, the gas leakage rate equals zero.Play the cut-off valve 3 of emergency cut-off effect, the fast ETAD expected time of arrival and departure of the total travel of bypass valve 4 was 1.3～4 seconds less than 0.9 second actuation time for zero load total travel, and inlet butterfly valve 6, cut-off valve 3, bypass valve 4 are by Hydraulic Servo Control
Because the characteristics of the shared machine of two stoves, the equipment of supply and drain water system selects with single stove TRT technology tangible difference is also arranged, the drainage pattern of this technology high pressure gas pipeline before turbine main frame 1 adopts and disperses draining, can be the drainage pattern that adopts single jar of liquid level control, can also be the mechanical self-draining mode that adopts Archimedes' principle.
As Fig. 2: the TRT working procedure of PLC Controlled by Programmable Controller is as follows:
1. begin;
2. whether starting condition possesses, starting condition does not exist for the TRT system has state of alarm, all blast furnaces inlet butterfly valves 6 cut out, have at least that an operation of blast furnace is normal, TRT cut-off valve 3 cuts out, bypass valve 4 cuts out is normal with auxiliary systems such as hydraulic pressure, lubricated, nitrogen envelope, water, electricity and gas, and gas temperature is normal;
3. possess as starting condition, "Yes" then applies for starting; "No" waits for that then starting condition possesses;
Whether 4. arbitrary blast furnace that possesses promotion TRT condition agrees that 4. "No" then returns step, and the then single blast furnace TRT of "Yes" starts, and emergency shutdown monitoring simultaneously starts, and when possessing the emergency shutdown condition, enters shutdown procedure, and TRT moves control program to be finished; The emergency shutdown condition is: 1 shaft vibration of turbine main frame, axial displacement is too big, or turbine main frame 1 speed is too high, or turbine main frame 1 axle temperature is too high, or generator set 2 shaft vibrations, axial displacement are too big, or generator set 2 axle temperatures are too high, or electrical system generation catastrophe failure, or the medium supply system breaks down, or cut-off valve 3 cuts out suddenly, or manually presses " suddenly stopping " button;
5. single blast furnace TRT operation;
Whether 6. single blast furnace orderly closedown (comprising manual request), and "Yes" then enters single blast furnace shutdown procedure, and TRT operation control program finishes; The then single blast furnace of "No" is not shut down, and second blast furnace could insert (comprising artificial agreement), and "Yes" then inserts second blast furnace, and 5. "No" then returns step;
7. two blast furnace TRT operations simultaneously;
8. two blast furnaces orderly closedown whether, "Yes" then enters two blast furnace orderly closedown programs, and TRT operation control program finishes; Whether the then single blast furnace of "No" withdraws from (containing artificial or automatic);
Whether 9. single blast furnace withdraws from, and "Yes" then enters single blast furnace and quits a program, and returns step then 5., and 7. "No" then returns step.
Because the diversity and the complexity of two blast furnace normal runnings of first, second, before the coal gas of two blast furnaces enters turbine main frame 1, need the inlet butterfly valve 6 through tightly regulating earlier, its effect is A, Qi Jishi, cooperates speed regulation and the normal also net operation of realizing turbine main frame 1 with variable stator vane angle; B, when normally moving, deduct setting value behind the special tolerances, realize that blast furnace top pressure pressure regulates by the furnace top pressure setting value of corresponding blast furnace; After C, corresponding blast furnace withdraw from,, be convenient to water-sealing valve 5 operations as the featuring rigid cutting-off device.By program such as Fig. 3, Fig. 5 of inlet butterfly valve 6 adjusting blast furnace roof pressures, hardware is selected the PLC programmable controller for use.Among Fig. 3, single blast furnace roof pressure regulating-controlling program is: the peak of selecting single blast furnace roof pressure measured load mobility scale a～b in selector, compare in comparator 10 with the single blast furnace roof pressure setting value after the correction computing in arithmetic element 9, in regulator, carry out the adjusting outputs such as PID of roof pressure then, realize the roof pressures adjusting by inlet butterfly valve 6 again.Among Fig. 5, the two-supremes furnace roof presses regulating-controlling program to be: the peak of selecting two blast furnace roof pressure measured load mobility scale a～b respectively in selector, with each self-corresponding in arithmetic element 9 revised blast furnace roof pressure setting value compare, in regulator, carry out the adjusting outputs such as PID of roof pressure then respectively, realize each self-corresponding blast furnace roof pressure adjusting by inlet butterfly valve 6 again.
The control system of this technology is at first determined the aperture of a variable stator vane angle, regulates corresponding furnace top pressure by tight adjusting first inlet butterfly valve 6 and the tight second inlet butterfly valve 6 of regulating again, and then by variable stator vane angle control turbine inlet pressure.In order to reduce the gas pressure loss to greatest extent, simultaneously reducing coal gas to greatest extent passes through through reduction valve group 8, control system to two blast furnace top pressure setting values deduct that result after corresponding gas purification resistance is decreased compares, after the computing, low choosing, as pressing the setting value of regulating before the variable stator vane angle.Purpose is to allow the pressure of coal gas transform at the TRT device as far as possible, and is multiple.Regulate program such as Fig. 4, Fig. 6 of TRT inlet pressure (being the inlet pressure of turbine main frame 1) by stator blade, hardware is selected the PLC programmable controller for use.Among Fig. 4, single blast furnace TRT inlet pressure adjusting program is: the setting value after single blast furnace roof pressure setting value of TRT inlet pressure and correction computing in arithmetic element 9 deducts special tolerances again compares in comparator 10, in regulator, carry out the adjustings such as PID of pressure, in compensator 11, carry out the nonlinear compensation output of control characteristic then, realize the control of TRT inlet pressure again by stator blade.Among Fig. 6, two blast furnace TRT inlet pressure adjusting programs are: TRT inlet pressure and every blast furnace setting value after the low choosing value of revised roof pressure setting value in selector deducts special tolerances in arithmetic element 9, in comparator 10, compare, in regulator, carry out the adjustings such as PID of pressure then, in compensator 11, carry out the nonlinear compensation output of control characteristic, realize the control of TRT inlet pressure again by stator blade.
When certain blast furnace breaks down or roof pressure when being lower than certain setting value, and this blast furnace roof pressure and another blast furnace roof pressure deviation be when excessive, and the TRT control system can allow this blast furnace gas withdraw from the TRT device automatically, and this blast furnace roof pressure transfers former reduction valve group 8 controls automatically to.At this moment, TRT technology is in single blast furnace generating state.
When the TRT device proper broke down, the repid cut-off valve 3 of TRT control system cut out rapidly, drove bypass valve 4 soon and opened and enter feed-forward regulation, and two blast furnace roof pressures are regulated corresponding smooth transition to separately reduction valve group 8 controls.
The TRT technology of the shared machine of the above blast furnace of two stoves is identical with the TRT technology of the shared machine of two stoves, and just after the dedusting of blast furnace gas system that increases, inlet porting butterfly valve 6, import water-sealing valve 5 get final product on the pipeline of drawing before the reduction valve group 8.And the control program of two shared machines of above blast furnace is identical with the program of two stoves, one machine.
Claims (10)
1, a kind of blast-furnace top gas recovery energy recovery turbine generator of many stoves one machine, this device comprises:
Two or more inlet butterfly valves (6), import water-sealing valve (5), a cut-off valve (3), individual outlet water-sealing valve (7);
One is singly advanced single removing from mould turbine main frame (1), a generator set (2), and the import of turbine main frame (1) connects cut-off valve (3), and outlet connects outlet water-sealing valve (7), the export and import pipeline of turbine main frame (1) bypass valve (4) in parallel;
Turbine main frame (1) adopts the above axial flow reaction turbine of two-stage, casing horizonally split; Turbine main frame (1) is controlled with full stator blade automatic servo, but first order stator blade contract fully wherein, and secondary and follow-up stator blade and one-level stator blade are adjusted automatically synchronously;
Two valve plates are set in the import water-sealing valve (5); In off position, water-filling between two valve plates;
In two or more dedusting of blast furnace gas system back, reduction valve group (8) is preceding, coal gas is drawn, pass through each self-corresponding inlet butterfly valve (6) respectively, the import water-sealing valve compiles after (5), enter turbine main frame (1) expansion acting by cut-off valve (3), and drive generator set (2) generating, after coal gas comes out from turbine main frame (1), through outlet water-sealing valve (7) or through after exporting water-sealing valve (7), enter the purified gas house steward through butterfly valve again; The hardware using PLC programmable controller of TRT operation control, blast furnace top pressure control, the control of TRT inlet pressure; Drainage pattern at the preceding high pressure gas pipeline of turbine main frame (1) adopts the dispersion draining.
2, a kind of blast-furnace top gas recovery energy recovery turbine power generation method of many stoves one machine comprises the following steps:
In two or more dedusting of blast furnace gas system back, reduction valve group (8) is preceding, coal gas is drawn, pass through each self-corresponding inlet butterfly valve (6) respectively, the import water-sealing valve compiles after (5), enter turbine main frame (1) expansion acting by cut-off valve (3), and drive generator set (2) generating, after coal gas comes out from turbine main frame (1), through outlet water-sealing valve (7) or behind process outlet water-sealing valve (7), enter the purified gas house steward through butterfly valve again, at the export and import pipeline of turbine main frame (1) bypass valve (4) in parallel, cut-off valve (3) is when cutting out, and coal gas is by bypass valve (4);
The turbine main frame (1) of coal gas turnover is for singly advancing single removing from mould, turbine main frame (1) adopts the above axial flow reaction turbine of two-stage, the casing horizonally split, turbine main frame (1) is controlled with full stator blade automatic servo, but first order stator blade contract fully wherein, secondary and follow-up stator blade and one-level stator blade are adjusted automatically synchronously;
Two valve plates are set in the import water-sealing valve (5); In off position, water-filling between two valve plates;
With PLC Programming of programmable controller control TRT operation, control blast furnace top pressure, control TRT inlet pressure;
Drainage pattern at the preceding high pressure gas pipeline of turbine main frame (1) adopts the dispersion draining.
3, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 2, the butterfly valve (6) that it is characterized in that entering the mouth is by Hydraulic Servo Control, and leakproofness is not less than leakage test B level, and total travel actuation time was smaller or equal to 4 seconds.
4, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 2 is characterized in that cut-off valve (3) by hydraulic control, and the zero load total travel quick closing valve time was less than 0.9 second.
5, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 2 is characterized in that bypass valve (4) by Hydraulic Servo Control, and the fast ETAD expected time of arrival and departure of total travel is 1.3～4 seconds.
6, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 1 is characterized in that with the TRT operating procedure of PLC Programming of programmable controller control as follows:
1. begin;
2. whether starting condition possesses, starting condition is: the TRT system does not have that state of alarm exists, all blast furnaces inlet butterfly valves (6) cut out, have at least that an operation of blast furnace is normal, TRT cut-off valve (3) cuts out, bypass valve (4) cuts out is normal with auxiliary systems such as hydraulic pressure, lubricated, nitrogen envelope, water, electricity and gas, and gas temperature is normal;
3. possess as starting condition, "Yes" then applies for starting; "No" waits for that then starting condition possesses;
Whether 4. arbitrary blast furnace that possesses promotion TRT condition agrees that 4. "No" then returns step, and the then single blast furnace TRT of "Yes" starts, and emergency shutdown monitoring simultaneously starts, and when possessing the emergency shutdown condition, enters shutdown procedure, and TRT moves control program to be finished; The emergency shutdown condition is: turbine main frame (1) shaft vibration, axial displacement is too big, or turbine main frame (1) speed is too high, or turbine main frame (1) axle temperature is too high, or generator set (2) shaft vibration, axial displacement are too big, or generator set (2) axle temperature is too high, or electrical system generation catastrophe failure, or the medium supply system breaks down, or cut-off valve (3) cuts out suddenly, or manually presses " suddenly stopping " button;
5. single blast furnace TRT operation;
Whether 6. single blast furnace orderly closedown, and "Yes" then enters single blast furnace shutdown procedure, and TRT operation control program finishes; The then single blast furnace of "No" is not shut down, and second blast furnace could insert, and "Yes" then inserts second blast furnace, and 5. "No" then returns step;
7. two blast furnace TRT operations simultaneously;
8. two blast furnaces orderly closedown whether, "Yes" then enters two blast furnace orderly closedown programs, and TRT operation control program finishes; Whether the then single blast furnace of "No" withdraws from;
Whether 9. single blast furnace withdraws from, and "Yes" then enters single blast furnace and quits a program, and returns step then 5., and 7. "No" then returns step.
7, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 2 is characterized in that with the blast furnace roof pressure regulating step of PLC Programming of programmable controller control as follows:
Single blast furnace roof pressure regulating step is: the peak of selecting single blast furnace roof pressure measured load mobility scale in selector, compare in comparator (10) with the single blast furnace roof pressure setting value after the correction computing in arithmetic element (9), in regulator, carry out roof pressure then and regulate output, realize the roof pressure adjusting by inlet butterfly valve (6) again;
Two and two above blast furnace roof pressure regulating steps are: the peak of selecting every blast furnace roof pressure measured load mobility scale respectively in selector, with each self-corresponding in arithmetic element (9) revised blast furnace roof pressure setting value compare, in regulator, carry out roof pressure then respectively and regulate output, realize each self-corresponding blast furnace roof pressure adjusting by inlet butterfly valve (6) again.
8, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 2 is characterized in that with the TRT inlet pressure regulating step of PLC Programming of programmable controller control as follows:
Single blast furnace TRT inlet pressure regulating step is: the setting value after single blast furnace roof pressure setting value of TRT inlet pressure and correction computing in arithmetic element (9) deducts special tolerances again compares in comparator (10), carrying out pressure in regulator regulates, in compensator (11), carry out the nonlinear compensation output of control characteristic then, realize the control of TRT inlet pressure again by stator blade;
Two or two above blast furnace TRT inlet pressure regulating steps are: TRT inlet pressure and every blast furnace setting value after the low choosing value of revised roof pressure setting value in selector deducts special tolerances in arithmetic element (9), in comparator (10), compare, carrying out pressure then in regulator regulates, in compensator (11), carry out the nonlinear compensation output of control characteristic, realize the control of TRT inlet pressure again by stator blade.
9, the blast-furnace top gas recovery energy recovery turbine power generation method of a kind of many stove one machines as claimed in claim 2 is characterized in that the dispersion drainage pattern in the preceding high pressure gas pipeline employing of turbine main frame (1), is the draining of adopting single jar of liquid level control.
10, the blast-furnace top gas recovery energy recovery turbine generating processs of a kind of many stove one machines as claimed in claim 1, it is characterized in that the dispersion drainage pattern in the preceding high pressure gas pipeline employing of turbine main frame (1), is the draining of adopting the mechanical type automatic water trap of Archimedes' principle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011065966A CN1175177C (en) | 2001-04-03 | 2001-04-03 | Turbine generating process for one machine to recover waste gas energy from several blast furnaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011065966A CN1175177C (en) | 2001-04-03 | 2001-04-03 | Turbine generating process for one machine to recover waste gas energy from several blast furnaces |
Publications (2)
| Publication Number | Publication Date |
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| CN1378038A CN1378038A (en) | 2002-11-06 |
| CN1175177C true CN1175177C (en) | 2004-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011065966A Expired - Fee Related CN1175177C (en) | 2001-04-03 | 2001-04-03 | Turbine generating process for one machine to recover waste gas energy from several blast furnaces |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008330B (en) * | 2006-12-29 | 2010-05-12 | 本溪钢铁(集团)有限责任公司 | Starting method of blast-furnace top gas recovery turbine generator |
| CN101871027B (en) * | 2009-12-30 | 2012-05-23 | 中冶南方工程技术有限公司 | Blast furnace top pressure control method adopting gas dry method dust-removing device |
| CN101792833B (en) * | 2010-03-26 | 2011-06-22 | 西安陕鼓动力股份有限公司 | Automatic sweeping method for nitrogen replaced with air in blast furnace gas energy recovery system pipe network |
| CN101792832B (en) * | 2010-03-26 | 2011-06-22 | 西安陕鼓动力股份有限公司 | Automatic sweeping method for air replaced with nitrogen in blast furnace gas energy recovery system pipe network |
| CN104190207B (en) * | 2014-08-20 | 2016-03-02 | 衡阳华菱钢管有限公司 | Coal gas purification system and coal gas method of purification |
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2001
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Granted publication date: 20041110 Termination date: 20140403 |