CN104310324A - Production method of electric draggable double-pressurizing nitric acid device - Google Patents
Production method of electric draggable double-pressurizing nitric acid device Download PDFInfo
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- CN104310324A CN104310324A CN201410538863.4A CN201410538863A CN104310324A CN 104310324 A CN104310324 A CN 104310324A CN 201410538863 A CN201410538863 A CN 201410538863A CN 104310324 A CN104310324 A CN 104310324A
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Abstract
The invention discloses a production method of an electric draggable double-pressurizing nitric acid device. The method comprises the following steps that 1) an output shaft of a motor is connected with a driving shaft of a nitric oxide compressor by virtue of a gear box; 2) an output shaft of the nitric oxide compressor is connected with a driving shaft of an air compressor; 3) an output shaft of the air compressor is connected with a driving shaft of a tail gas turbine motor; 4) the motor is started, so that the motor and a unit are accelerated; in the accelerating process, based on the rotating speed of the air compressor, when two unit surge points of 2400r/m and 5600r/m go through, the unit goes through while the speed is accelerated; 10-15 minutes are remained at the rotating speeds of 4800r/m and 7800r/m, and the electric draggable unit can be directly accelerated to 8600r/m after being remained for 10-15 minutes at 7800r/m; and 5) the driving air volume of the device is achieved by adjusting the openness of a stationary guide blade of the air compressor. The method disclosed by the invention is used for solving the technical problem that an existing draggable four-in-one unit of a turbine has the environmental problem and is high in economic cost.
Description
Technical field
The present invention relates to the production method of two Nitric Acid Device, specifically a kind of electricity drags the production method of two Nitric Acid Device.
Background technology
At present, the most advanced production technology of domestic and international production nitric acid is " double pressurized method " Technology, device is when driving and relies on the out-of-bounds steam shown in Fig. 1 for its nucleus equipment " four-in-one unit " red switch, treat that unit reaches certain rotating speed, system reaches relevant pressure, and after the oxidized still of nitric acid plant igniting reaction, reaction heat becomes steam through indirect heat exchange and progressively replaces out-of-bounds after steam, throw out-of-bounds steam again away, device relies on self-energy to run.The nitric acid plant that existing steam turbine shown in Fig. 1 drags " four-in-one unit " produce in there are the following problems: 1, due to the reasons such as technological design, lectotype selection, device fabrication cause nitric acid plant normally to run sometimes after self by-product steam all consume by steam turbine, some devices even also need external steam to supplement could to maintain nitric acid plant steadily normally to run.2, the nitric acid plant of steam turbine dragging " four-in-one unit " (general 2-5 hour) in startup procedure needs outside to provide a large amount of high-quality superheated vapours.For meeting the required steam of nitric acid plant driving, needing to control the normal steam consumption of other device, and affecting the production of other device.Many companies do not have outside can for driving steam, then must a driving boiler for subsequent use, add great amount of investment, cause again boiler to leave unused for a long time.At present, due to control atmosphere pollution Environmental Protection Situation needed for, many areas have prohibitted the use or have limited use coal firing boiler.3, device driving adopts steam turbine to drag " four-in-one unit ", has to pass through multiple raising speed, intensification control stage when unit starting is driven, and startup is driven, and control is complicated, process is longer; Generating unit speed steam turbine throttle flow regulates, required automatic instrument(s) system complex.
Summary of the invention
Object of the present invention is just to provide production method that a kind of electricity drags two Nitric Acid Device and drags environmental problem existing for " four-in-one unit " and the high technical problem of Financial cost to solve existing steam turbine.
The present invention is achieved in that
The production method that electricity drags two Nitric Acid Device comprises the following steps:
1) motor output shaft is connected with nitrogen oxide gas compressor main drive shaft by wheel box;
2) output shaft of nitrogen oxide gas compressor is connected with the main drive shaft of air compressor;
3) main drive shaft of the output shaft of air compressor with tail gas turbine machine is connected;
4) starter motor, makes motor and unit raise speed; In speed-raising process, with air compressor velocity gauge, through 2400 revs/min, 5600 revs/min two unit surge points, to raise speed fast and pass through; 4800 revs/min, 7800 revs/min of rotating speeds time all to stop 10-15 minute, electricity drags unit and stops after 10-15 minute from 7800 revs/min and can directly raise speed 8600 revs/min;
5) device driving air quantity is reached by the described air compressor stator blade aperture of adjustment.
A kind of electricity drags two Nitric Acid Device and comprises:
Variable-frequency motor;
Wheel box, it connects with the output shaft of variable-frequency motor;
Nitrogen oxide gas compressor, its main drive shaft is connected with the output shaft of wheel box;
Air compressor, its main drive shaft connects with the output shaft of nitrogen oxide gas compressor; And
Tail gas turbine machine, its main drive shaft connects with the output shaft of air compressor.
Electricity of the present invention drags the method for two Nitric Acid Device, motor adopts external fan to control its operating temperature, instrument control is carried out with indexs such as comparatively simple motor temperature, rotating speed, frequency conversion, wheel box oil level, vibrations, thus eliminate in prior art the equipment such as required steam turbine and attached water coolant, water circulating pump when using four conjunction units, and the instrument automatic control part such as corresponding temperature, pressure, liquid level, vibrations, decrease and control error chance, add driving stationarity.The more important thing is, when normally producing, the nitric acid plant of a set of 150,000 tons/year is than originally reducing 900m
3the refrigeration cycle water consumption (accounting for 1/3 of complete assembly recirculated water consumption) of/h, has saved device energy-wasting greatly; And the direct drum by device steadily outwards carries the high-quality steam of produced pressure 3.82MPa, temperature 420 DEG C through diameter 159mm pipeline, operational throughput is 24.5 tons/hour, considerably increases the ability that device outwards carries clean energy.
Produce with motor run nitric acid plant, the steam of nitric acid plant waste heat by-product is all exported, with the environmental protection form conveying energy, serve production, life better.
Drag relative to nitric acid plant steam turbine middle pressure, the superheated vapour (3.82Mpa, 420 DEG C) that " four-in-one unit " consume, supply of electric power is sufficient, comparatively environmental protection.With motor run nitric acid plant " four-in-one unit " start up, run control simple, convenient.
Utilize method of the present invention, not only stop to rely on out-of-bounds steam, save and buy boiler, but also the high-quality steam that unit self can be produced outwards is carried, and to be used for industrial production and life hot, steam is produced to reduce coal firing boiler, this strengthens today of air contaminant treatment in China, is the good thing of energy-saving and emission-reduction, tallies with the national condition and the needs of Green Development.
In addition, method of the present invention, also produces certain economic benefit while the huge environmental benefit of generation.The existing nitric acid production ability of China 1,500 ten thousand tons/year, based on " double pressurized method " Technology, single covering device production capacity is mainly 270,000 tons/year, 150,000 tons/year and 100,000 tons/year.Effect analysis is carried out below for 150,000 tons/year of production equipments.
1, for 150,000 tons/year of nitric acid plants, byproduct steam 25 tons/hour (3.82Mpa, 420 DEG C) superheated vapour, steam turbine drags " four-in-one unit " and consumes this steam 20 tons/hour.This steam drags counter pressure turbine and substitutes 1000KW motor drag equipment operation, and steam after counter pressure turbine (1.3Mpa, 220 DEG C) can continue that supply is produced, life uses.The power of motor that 150000 tons/year of nitric acid plants change motor run " four-in-one unit " into is 5000kw, and large commercial power electricity price calculates by 0.70 yuan/kwh, then the increase electricity charge per hour: 4000*0.70=2800 first/hour;
Steam price, by 160 yuan/ton of calculating, exports steam benefit:
20*160=3200 unit/hour
Like this, can increase economic benefit is every year:
8000*400=320 ten thousand yuan/year
2, produce coal-fired about 3.57 tons/hour, the signature coal of 25 tons of/hour steam consumptions, like this, nitric acid waste heat byproduct steam can save mark 2.86 ten thousand tons, coal every year; SO can be reduced discharging
2measure 685 tons, reduce discharging flue dust 1500 tons, reduce discharging NO
x229 tons, there is huge environmental benefit.
3, produce with motor run nitric acid plant, simplify technological operation, saved recirculated water consumption, overcome during existing steam turbine dragging nitric acid plant is produced and there is many unfavorable problems, industry has exemplary role.
The present invention is by startup scheme reasonable in design, solve surge problems existing in start-up course, and nitrogen oxide gas compressor, air compressor, break-in problem between tail gas turbine machine, three machines that achieve synchronous axial system under a driven by motor, makes electricity of the present invention drag nitric acid plant and successfully replaces existing steam actuator.
Accompanying drawing explanation
Fig. 1 is that prior art is with the structural representation of steam driven unit.
Fig. 2 is that the inventive method is with the structural representation of motor actuating unit.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described
Shown in Fig. 2, electricity of the present invention drags two Nitric Acid Device, and comprise variable-frequency motor 1, motor 1 output shaft is connected with the main drive shaft of nitrogen oxide gas compressor 3 by wheel box 2 output shaft; The output shaft of nitrogen oxide gas compressor 3 connects with the main drive shaft of air compressor 4; The output shaft of air compressor 4 connects with the main drive shaft of tail gas turbine machine 5.
The start-up course of this device is: starter motor, and motor and unit are raised speed, extremely through 2400 revs/min, 5600 revs/min two unit surge points, to raise speed fast and pass through, quick speed-raising is by referring to: do not stop, and keep acceleration speed-raising, the rotating speed upwards carried is not less than 1000 revs/min always.In case the surge of stop machine group causes structure deteriorate, and respectively at 4800 revs/min, all 10-15 minute will be stopped during 7800 revs/min of rotating speeds, be beneficial to the abundant break-in that the unit of unitary rotation is mutual, electricity drags after unit stops 10-15 minute from 7800 revs/min and can directly raise speed in rotational speed of air compressor 8600 revs/min, by adjust described air compressor 4 stator blade aperture reach this production equipment drive needed for air quantity, namely adjust air compressor 4 stator blade aperture and make the air capacity entering oxidized still from air compressor 4 successively, the gas volume that autoxidation stove enters nitrogen oxide gas compressor and the gas volume entering nitric acid absorption tower 6 after nitrogen oxide gas compressor pressure-raising meet the requirement of nitric acid absorption tower 6 topping up rapidly, so that implement device is driven at short notice.Compare and drag driving with steam and will save the driving time more than 1/3, and compare and utilize out-of-bounds steam to drive, method of the present invention operation is more simple, saves the dependence of steam boiler to external world, makes the operation of device from restriction.After device is driven, namely the increase gradually of producing load along with system has steam to out-of-bounds exporting, and provides clean energy.
Method designed by the present invention, by designing the startup optimization mode of motor, achieves under the driving of a motor, the nitrogen oxide gas compressor of unit, air compressor and the synchronous operation of tail gas turbine machine.
In nitric acid plant of the present invention, motor adopts external fan to control its operating temperature, remove the equipment such as original steam turbine and attached water coolant, water circulating pump, and the instrument automatic control part such as corresponding temperature, pressure, liquid level, vibrations, carry out instrument control with indexs such as comparatively simple motor temperature, rotating speed, frequency conversion, wheel box oil level, vibrations; Decrease and control error chance, add driving stationarity.
Nitric acid plant of the present invention drives to adjust unit turn up gradually to driving condition by variable-frequency motor, steadily drives; And the steam of former steam supply equipment oxidized still 7 is directly sent outside, for periphery production, lifestyle device provide steam, reduce the use of coal firing boiler, environmental friendliness, suitable popularization.
Claims (2)
1. electricity drags a production method for two Nitric Acid Device, it is characterized in that comprising the following steps:
1) motor output shaft is connected with nitrogen oxide gas compressor main drive shaft by wheel box;
2) output shaft of nitrogen oxide gas compressor is connected with the main drive shaft of air compressor;
3) main drive shaft of the output shaft of air compressor with tail gas turbine machine is connected;
4) starter motor, makes motor and unit raise speed; In speed-raising process, with air compressor velocity gauge, through 2400 revs/min, 5600 revs/min two unit surge points, to raise speed fast and pass through; 4800 revs/min, 7800 revs/min of rotating speeds time all to stop 10-15 minute, electricity drags unit and stops after 10-15 minute from 7800 revs/min and can directly raise speed 8600 revs/min;
5) device driving air quantity is reached by the described air compressor stator blade aperture of adjustment.
2. electricity drags a two Nitric Acid Device, it is characterized in that, comprising:
Variable-frequency motor;
Wheel box, it connects with the output shaft of variable-frequency motor;
Nitrogen oxide gas compressor, its main drive shaft is connected with the output shaft of wheel box;
Air compressor, its main drive shaft connects with the output shaft of nitrogen oxide gas compressor; And
Tail gas turbine machine, its main drive shaft connects with the output shaft of air compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410538863.4A CN104310324A (en) | 2014-10-14 | 2014-10-14 | Production method of electric draggable double-pressurizing nitric acid device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410538863.4A CN104310324A (en) | 2014-10-14 | 2014-10-14 | Production method of electric draggable double-pressurizing nitric acid device |
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| CN104310324A true CN104310324A (en) | 2015-01-28 |
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| CN201410538863.4A Pending CN104310324A (en) | 2014-10-14 | 2014-10-14 | Production method of electric draggable double-pressurizing nitric acid device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107265421A (en) * | 2016-04-06 | 2017-10-20 | 曼柴油机和涡轮机欧洲股份公司 | Mechanical unit for producing nitric acid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030143148A1 (en) * | 2000-03-10 | 2003-07-31 | Rainer Maurer | Method for producing nitric acid |
| CN1865130A (en) * | 2005-05-19 | 2006-11-22 | 西门子公司 | Nitric acid preparation method and device |
| CN102491292A (en) * | 2011-12-06 | 2012-06-13 | 中国成达工程有限公司 | Low-consumption and low-emission nitric acid production method and production equipment thereof |
-
2014
- 2014-10-14 CN CN201410538863.4A patent/CN104310324A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030143148A1 (en) * | 2000-03-10 | 2003-07-31 | Rainer Maurer | Method for producing nitric acid |
| CN1865130A (en) * | 2005-05-19 | 2006-11-22 | 西门子公司 | Nitric acid preparation method and device |
| CN102491292A (en) * | 2011-12-06 | 2012-06-13 | 中国成达工程有限公司 | Low-consumption and low-emission nitric acid production method and production equipment thereof |
Non-Patent Citations (1)
| Title |
|---|
| 乔海星等: "硝酸生产中的四合一机组", 《化工设备与管道》, vol. 37, no. 5, 31 December 2000 (2000-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107265421A (en) * | 2016-04-06 | 2017-10-20 | 曼柴油机和涡轮机欧洲股份公司 | Mechanical unit for producing nitric acid |
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Application publication date: 20150128 |