CN100350187C - Pneumatic conveying system for spraying calcium in stokehole - Google Patents
Pneumatic conveying system for spraying calcium in stokehole Download PDFInfo
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- CN100350187C CN100350187C CNB2004100247975A CN200410024797A CN100350187C CN 100350187 C CN100350187 C CN 100350187C CN B2004100247975 A CNB2004100247975 A CN B2004100247975A CN 200410024797 A CN200410024797 A CN 200410024797A CN 100350187 C CN100350187 C CN 100350187C
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- hopper
- conveying
- limestone powder
- air
- transported
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Abstract
The present invention relates to a pneumatic conveying system for spraying calcium in a stokehole, which comprises a storage bin, an upper hopper, a lower hopper, a screw conveyer and a blower, wherein the outlet of the lower hopper is connected with the screw conveyer, the discharge port of the screw conveyer is connected with a vertical downpipe through a horizontal conveying pipe, the air outlet of the blower is connected with an air pipe, the other end of the air pipe is connected with the inlet end of a material conveying pipe, the lower port of the downpipe is also connected with the material conveying pipe, and the screw conveyer is driven by a motor of frequency conversion and speed modulation, electrically connected with a frequency converter. The conveying capacity of the limestone powder is accurately controlled by a control device comprising an industrial controller, a frequency converter and a sulfur dioxide concentration sensor. The materials are uniformly fed, the energy consumption of screw conveying is low, and the limestone powder in a solid state and the high pressure draft are uniformly mixed in the conveying pipe. The system has the advantages of enhancement of desulfurization effect, low energy consumption, and accurate measurement, and largely saves desulfurizing agents.
Description
Technical field
The present invention relates to the mass transport technology of Dual-Phrase Distribution of Gas olid, relate in particular to the technology of spraying the calcium feed, particularly a kind of stokehold spray calcium air-transport system to CFBB and semi-dry desulphurization stove.The spray calcium air-transport system that coal-fired power plant's desulfurization is used.
Background technology
In the prior art, in order to administer contained sulfur dioxide in the coal-fired power plant discharging flue gas, generally adopt limestone powder as desulfurizing agent, when limestone powder was directed onto specified temp district in the burner hearth, the limestone powder decomposes became calcium oxide and carbon dioxide:
CaCO
3→CaO+CO
2
Then, part sulfur dioxide in calcium oxide and the flue gas and the reaction of whole sulfur trioxides generate calcium sulfate, reach the effect of flue gas desulfurization:
CaO+SO
3→CaSO
4
2CaO+2SO
2+O
2→2CaSO
4
Generally utilize CFBB and semi-dry process flue gas desulphurization technology in the prior art, spray into limestone powder in burner hearth, the mode of movement of desulfurizing agent adopts pressurized tank more in CFBB and semi-dry desulphurization technology, carries with pressure-air.Promptly earlier the lime stone powder is added pressurized tank, then to pressurizeing in the pressurized tank, when pressure reaches certain value, open the bleeder valve on the pressurized tank, limestone powder just sprays in the CFBB through the discharging opening of bleeder valve.But there is following shortcoming in this pressurized tank mode of movement: 1, feed is inhomogeneous, influences desulfurized effect, 2, the energy consumption height, 3, metering is inaccurate, easily causes the waste of desulfurizing agent.
Summary of the invention:
Technical problem of the prior art to be solved by this invention is: because in CFBB of the prior art and the semi-dry process flue gas desulphurization technology, the mode of movement of desulfurizing agent adopts pressurized tank more, carries with pressure-air.Need earlier the lime stone powder to be added pressurized tank, then to pressurizeing in the pressurized tank, when pressure reaches certain value, open the bleeder valve on the pressurized tank, limestone powder just sprays in the CFBB through the discharging opening of bleeder valve.So there is following shortcoming in this technology: 1, feed is inhomogeneous, influences desulfurized effect, 2, the energy consumption height, 3, metering is inaccurate, easily causes the waste of desulfurizing agent.
The technical scheme that the present invention is adopted for solution above-mentioned technical problem of the prior art provides a kind of stokehold spray calcium air-transport system, described this stokehold spray calcium air-transport system is by feed bin, the top hopper, the bottom hopper, conveying worm and blower fan constitute, described conveying worm has a charging aperture and a discharging opening, described blower fan has an air outlet, wherein, described top hopper is arranged on the top of described bottom hopper, described top hopper communicates with described bottom hopper, described feed bin is arranged on the top of described top hopper, described feed bin communicates with described top hopper, described bottom hopper has a bottom hopper outlet, described bottom hopper outlet is connected with the charging aperture of described conveying worm, the discharging opening of described conveying worm is connected by a horizontal conveying pipe with a vertically disposed material blanking tube, the air outlet of described blower fan is connected with an end of an air hose, the other end of described air hose is connected with the arrival end of a conveying pipeline, the lower port of described material blanking tube is connected to described conveying pipeline, described conveying worm is driven by a frequency control motor, and described frequency control motor and a frequency converter are electrically connected.
Further, described frequency converter and an industrial computer are electrically connected, and described industrial computer also is connected with a sulfur dioxide concentration sensor, and described sulfur dioxide concentration sensor is arranged in the flue between deduster and the chimney.
Further, described frequency control motor is provided with the motor speed checkout gear, and described motor speed checkout gear and an industrial computer are electrically connected.Concrete, described motor speed checkout gear can adopt induction type near switch or shaft encoder.The motor speed checkout gear can more accurately detect the output speed of motor.
Further, described conveying pipeline has a port of export, and the described port of export is provided with an injection valve.
Further, be provided with one first pressure-equalizing pipe between described top hopper and the described air hose, described first pressure-equalizing pipe is communicated with described top hopper and described air hose.
Further, be provided with one second pressure-equalizing pipe between described bottom hopper and the described material blanking tube, described second pressure-equalizing pipe is communicated with described bottom hopper and described material blanking tube.
Described first pressure-equalizing pipe and second pressure-equalizing pipe can make and keep reliable discharge pressure in top hopper and the bottom hopper.
Further, be provided with a check (non-return) valve in the connecting pipe between the discharging opening of described conveying worm and the described material blanking tube.Check (non-return) valve is fled in the conveying worm to prevent the high pressure gas in the material blanking tube.
The spray calcium pneumatic conveying method that the present invention also provides a kind of stokehold spray calcium air-transport system of the present invention to be adopted, described this spray calcium pneumatic conveying method comprises that one is transported to limestone powder the conveying pipeline from a feed bin, and be transported to process in the boiler: wherein by the port of export of described conveying pipeline, described limestone powder is transported to the conveying pipeline from a feed bin, and be transported in the process in the boiler by the port of export of described conveying pipeline and comprise a first step that limestone powder is transported to described top hopper from described feed bin, also comprise second step that limestone powder is transported to described bottom hopper from described top hopper, also comprise a third step that limestone powder is transported to the charging aperture of described conveying worm from described bottom hopper, comprise that also one is transported to the 4th step of described material blanking tube with limestone powder from the discharging opening of described conveying worm, comprise that also one is transported to the lower port of limestone powder from described material blanking tube the described conveying pipeline, and and the 5th step of mixing from the high pressure draught of described air hose.
Further, the third step of the described charging aperture that limestone powder is transported to described conveying worm from described bottom hopper, utilize a speed-regulating control device to control the rotating speed of described frequency control motor.
Further, described frequency converter and an industrial computer are electrically connected, and described industrial computer also is connected with a sulfur dioxide concentration sensor, and described sulfur dioxide concentration sensor is arranged in the flue between deduster and the chimney.Utilize described sulfur dioxide concentration sensor to obtain the concentration parameter of sulfur dioxide in the boiler, and the concentration parameter of sulfur dioxide is delivered to described industrial computer, calculate the limestone powder amount that to add by described industrial computer again, export the tachometer value of described frequency control motor by described industrial computer to described frequency converter again, regulate the rotating speed of the described frequency control motor of control.
Further, described frequency control motor is provided with the motor speed checkout gear, described motor speed checkout gear and described industrial computer are electrically connected, and described motor speed checkout gear is delivered to described industrial computer with the rotating speed of described frequency control motor.
Further, feed bin described in the present invention, the top hopper, the bottom hopper, conveying worm, blower fan, frequency converter, frequency control motor, the sulfur dioxide concentration sensor, conveying pipeline, material blanking tube, industrial computer, horizontal conveying pipe, air hose, first pressure-equalizing pipe, second pressure-equalizing pipe, induction type is near switch, check (non-return) valve and injection valve all can adopt the known solution in the prior art to realize, relevant feed bin, the top hopper, the bottom hopper, conveying worm, blower fan, frequency converter, frequency control motor, the sulfur dioxide concentration sensor, conveying pipeline, material blanking tube, industrial computer, horizontal conveying pipe, air hose, first pressure-equalizing pipe, second pressure-equalizing pipe, induction type is near switch, check (non-return) valve and the injection valve known solution in prior art is known by those of ordinary skill in the art, so do not repeat them here.Concrete, described blower fan can preferably adopt the Roots blower in the prior art.
The present invention and prior art contrast, and its effect is actively with tangible.The present invention utilizes frequency control motor to drive conveying worm and carries solid-state limestone powder, so can accurately control conveying capacity, and utilize by industrial computer, the control device that frequency converter and sulfur dioxide concentration sensor constitute, accurate conveying value can be set, simultaneously, solid-state limestone powder enters material blanking tube by the discharging opening of conveying worm by horizontal conveying pipe, so uniform feeding, the energy consumption of helical feed is low, and, conveying pipeline has connected blower fan simultaneously, the solid-state limestone powder from material blanking tube evenly can be mixed with high pressure draught in conveying pipeline.The machinery of precision is carried in the present invention and the strength conveying organically combines, and makes feed even, improved desulfurized effect, and energy consumption is low, and accurate measurement has been saved desulfurizing agent widely.
Description of drawings:
Fig. 1 is the schematic diagram of stokehold spray calcium air-transport system of the present invention.
The specific embodiment:
As shown in Figure 1, stokehold spray calcium air-transport system of the present invention is by feed bin 3, top hopper 4, bottom hopper 5, conveying worm 1 and blower fan 2 constitute, described conveying worm 1 has a charging aperture and a discharging opening, described blower fan 2 has an air outlet, wherein, described top hopper 4 is arranged on the top of described bottom hopper 5, described top hopper 4 communicates with described bottom hopper 5, described feed bin 3 is arranged on the top of described top hopper 4, described feed bin 3 communicates with described top hopper 4, described bottom hopper 5 has a bottom hopper outlet, described bottom hopper outlet is connected with the charging aperture of described conveying worm 1, the discharging opening of described conveying worm 1 is connected by a horizontal conveying pipe with a vertically disposed material blanking tube 7, the air outlet of described blower fan 2 is connected with an end of an air hose, the other end of described air hose is connected with the arrival end of a conveying pipeline 8, the lower port of described material blanking tube 7 is connected to described conveying pipeline 8, described conveying worm 1 is driven by a frequency control motor, and described frequency control motor and a frequency converter are electrically connected.
Further, described frequency converter and an industrial computer are electrically connected, and described industrial computer also is connected with a sulfur dioxide concentration sensor, and described sulfur dioxide concentration sensor is arranged in the flue between deduster and the chimney.
Further, described frequency control motor is provided with the motor speed checkout gear, and described motor speed checkout gear and an industrial computer are electrically connected.In a preferred embodiment of the invention, described motor speed checkout gear adopts induction type near switch.The motor speed checkout gear can more accurately detect the output speed of motor.
Further, described conveying pipeline 8 has a port of export, and the described port of export is provided with an injection valve.
Further, be provided with one first pressure-equalizing pipe 10 between described top hopper 4 and the described air hose, described first pressure-equalizing pipe 10 is communicated with described top hopper 4 and described air hose.
Further, be provided with one second pressure-equalizing pipe 6 between described bottom hopper 5 and the described material blanking tube 7, described second pressure-equalizing pipe 6 is communicated with described bottom hopper 5 and described material blanking tube 7.
Described first pressure-equalizing pipe 10 and second pressure-equalizing pipe 6 can make in top hopper 4 and the bottom hopper 5 and keep reliable discharge pressure.
Further, be provided with a check (non-return) valve 9 in the connecting pipe between the discharging opening of described conveying worm 1 and the described material blanking tube 7.Check (non-return) valve 9 can prevent that the high pressure gas in the material blanking tube 7 from fleeing in the conveying worm 1.
The spray calcium pneumatic conveying method that the present invention also provides a kind of stokehold spray calcium air-transport system of the present invention to be adopted, described this spray calcium pneumatic conveying method comprises that one is transported to limestone powder the conveying pipeline 8 from a feed bin 3, and be transported to process in the boiler: wherein by the port of export of described conveying pipeline 8, described limestone powder is transported to the conveying pipeline 8 from a feed bin 3, and be transported in the process in the boiler by the port of export of described conveying pipeline 8 and comprise a first step that limestone powder is transported to described top hopper 4 from described feed bin 3, also comprise second step that limestone powder is transported to described bottom hopper 5 from described top hopper 4, also comprise a third step that limestone powder is transported to the charging aperture of described conveying worm 1 from described bottom hopper 5, comprise that also one is transported to the 4th step of described material blanking tube 7 with limestone powder from the discharging opening of described conveying worm 1, comprise that also one is transported to the lower port of limestone powder from described material blanking tube 7 the described conveying pipeline 8, and and the 5th step of mixing from the high pressure draught of described air hose.
Further, the third step of the described charging aperture that limestone powder is transported to described conveying worm 1 from described bottom hopper 5, utilize a speed-regulating control device to control the rotating speed of described frequency control motor.
Further, described frequency converter and an industrial computer are electrically connected, and described industrial computer also is connected with a sulfur dioxide concentration sensor, and described sulfur dioxide concentration sensor is arranged in the flue between deduster and the chimney.Utilize described sulfur dioxide concentration sensor to obtain the concentration parameter of sulfur dioxide in the boiler, and the concentration parameter of sulfur dioxide is delivered to described industrial computer, calculate the limestone powder amount that to add by described industrial computer again, export the tachometer value of described frequency control motor by described industrial computer to described frequency converter again, regulate the rotating speed of the described frequency control motor of control.
Further, described frequency control motor is provided with the motor speed checkout gear, described motor speed checkout gear and described industrial computer are electrically connected, and described motor speed checkout gear is delivered to described industrial computer with the rotating speed of described frequency control motor.
In one embodiment of the invention, the conveying capacity of limestone powder is 9 tons/hour, the bulk specific weight of limestone powder is 1.3 tons/cubic metre, horizontal transport distance is 50 meters, and the vertical transport distance is 15 meters, and the power of conveying worm is 1.1 kilowatts, the air output of blower fan is 16 cubic meters per minute, the blast pressure of blower fan is 50 kPas, and the power of blower fan is 20 kilowatts, and the conveying pipeline diameter is DN100.
In yet another embodiment of the present invention, the conveying capacity of limestone powder is 12.6 tons/hour, the bulk specific weight of limestone powder is 1.2～1.5 tons/cubic metre, horizontal transport distance is 36 meters, and the vertical transport distance is 16 meters, and the power of conveying worm is 2.2 kilowatts, the air output of blower fan is 16 cubic meters per minute, the blast pressure of blower fan is 42 kPas, and the power of blower fan is 28 kilowatts, and the conveying pipeline diameter is DN125.
Claims (12)
1, a kind of stokehold spray calcium air-transport system, by feed bin, the top hopper, the bottom hopper, conveying worm and blower fan constitute, described conveying worm has a charging aperture and a discharging opening, described blower fan has an air outlet, it is characterized in that: described top hopper is arranged on the top of described bottom hopper, described top hopper communicates with described bottom hopper, described feed bin is arranged on the top of described top hopper, described feed bin communicates with described top hopper, described bottom hopper has a bottom hopper outlet, described bottom hopper outlet is connected with the charging aperture of described conveying worm, the discharging opening of described conveying worm is connected by a horizontal conveying pipe with a vertically disposed material blanking tube, the air outlet of described blower fan is connected with an end of an air hose, the other end of described air hose is connected with the arrival end of a conveying pipeline, the lower port of described material blanking tube is connected to described conveying pipeline, described conveying worm is driven by a frequency control motor, and described frequency control motor and a frequency converter are electrically connected.
2, stokehold spray calcium air-transport system according to claim 1, it is characterized in that: described frequency converter and an industrial computer are electrically connected, described industrial computer also is connected with a sulfur dioxide concentration sensor, and described sulfur dioxide concentration sensor is arranged in the flue between deduster and the chimney.
3, stokehold spray calcium air-transport system according to claim 1, it is characterized in that: described frequency control motor is provided with the motor speed checkout gear, and described motor speed checkout gear and an industrial computer are electrically connected.
4, stokehold spray calcium air-transport system according to claim 3, it is characterized in that: described motor speed checkout gear is that induction type is near switch.
5, stokehold spray calcium air-transport system according to claim 1, it is characterized in that: described conveying pipeline has a port of export, and the described port of export is provided with an injection valve.
6, stokehold spray calcium air-transport system according to claim 1, it is characterized in that: be provided with one first pressure-equalizing pipe between described top hopper and the described air hose, described first pressure-equalizing pipe is communicated with described top hopper and described air hose.
7, stokehold spray calcium air-transport system according to claim 1, it is characterized in that: be provided with one second pressure-equalizing pipe between described bottom hopper and the described material blanking tube, described second pressure-equalizing pipe is communicated with described bottom hopper and described material blanking tube.
8, stokehold spray calcium air-transport system according to claim 1 is characterized in that: be provided with a check (non-return) valve in the connecting pipe between the discharging opening of described conveying worm and the described material blanking tube.
9, a kind of spray calcium pneumatic conveying method of stokehold spray calcium air-transport system according to claim 1, comprise that one is transported to limestone powder the conveying pipeline from a feed bin, and be transported to process in the boiler: it is characterized in that: described limestone powder is transported to the conveying pipeline from a feed bin by the port of export of described conveying pipeline, and be transported in the process in the boiler by the port of export of described conveying pipeline and comprise a first step that limestone powder is transported to described top hopper from described feed bin, also comprise second step that limestone powder is transported to described bottom hopper from described top hopper, also comprise a third step that limestone powder is transported to the charging aperture of described conveying worm from described bottom hopper, also comprise the 4th step that limestone powder is transported to described material blanking tube from the discharging opening of described conveying worm, comprise that also one is transported to the lower port of limestone powder from described material blanking tube the described conveying pipeline, and and the 5th step of mixing from the high pressure draught of described air hose.
10, spray calcium pneumatic conveying method according to claim 9, it is characterized in that: the third step of the described charging aperture that limestone powder is transported to described conveying worm from described bottom hopper, utilize a speed-regulating control device to control the rotating speed of described frequency control motor.
11, spray calcium pneumatic conveying method according to claim 10, it is characterized in that: described frequency converter and an industrial computer are electrically connected, described industrial computer also is connected with a sulfur dioxide concentration sensor, described sulfur dioxide concentration sensor is arranged in the flue between deduster and the chimney, utilize described sulfur dioxide concentration sensor to obtain the concentration parameter of sulfur dioxide in the boiler, and the concentration parameter of sulfur dioxide is delivered to described industrial computer, calculate the limestone powder amount that to add by described industrial computer again, export the tachometer value of described frequency control motor by described industrial computer to described frequency converter again, regulate the rotating speed of the described frequency control motor of control.
12, spray calcium pneumatic conveying method according to claim 11, it is characterized in that: described frequency control motor is provided with the motor speed checkout gear, described motor speed checkout gear and described industrial computer are electrically connected, and described motor speed checkout gear is delivered to described industrial computer with the rotating speed of described frequency control motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100247975A CN100350187C (en) | 2004-05-28 | 2004-05-28 | Pneumatic conveying system for spraying calcium in stokehole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100247975A CN100350187C (en) | 2004-05-28 | 2004-05-28 | Pneumatic conveying system for spraying calcium in stokehole |
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| Publication Number | Publication Date |
|---|---|
| CN1704647A CN1704647A (en) | 2005-12-07 |
| CN100350187C true CN100350187C (en) | 2007-11-21 |
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|---|---|---|---|
| CNB2004100247975A Expired - Fee Related CN100350187C (en) | 2004-05-28 | 2004-05-28 | Pneumatic conveying system for spraying calcium in stokehole |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2921854B1 (en) * | 2007-10-09 | 2011-04-15 | Saint Gobain Pont A Mousson | POWDER DELIVERY DEVICE, CASTING PLANT AND CORRESPONDING METHOD |
| CN102145253B (en) * | 2010-12-31 | 2012-12-12 | 东莞理文造纸厂有限公司 | Gas desulfurization system in recirculating fluidized bed boiler |
| CN102705815A (en) * | 2012-05-08 | 2012-10-03 | 佛山市沛沣科技有限公司 | Powder combustion device |
| CN103197549B (en) * | 2013-03-04 | 2016-04-13 | 华北电力大学 | The hard measurement of Circulating Fluidized Bed Boiler sulfur dioxide in flue gas and optimal control method |
| CN108317509A (en) * | 2018-03-15 | 2018-07-24 | 中国石油化工股份有限公司洛阳分公司工会委员会 | A kind of circulating fluidized bed boiler agstone feeding system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987007528A1 (en) * | 1986-06-03 | 1987-12-17 | Euroc Research Ab | Method for desulphurising directly flue gas in a furnace |
| DE3922921A1 (en) * | 1989-07-12 | 1991-01-24 | Rwe Energie Ag | Waste incineration plant operation - using limestone injection to suppress hydrogen chloride corrosion |
| JPH0379905A (en) * | 1989-07-28 | 1991-04-04 | Hitachi Zosen Corp | Device to spread uniformly desulfurizing agent in furnace |
| CN1390628A (en) * | 2002-07-17 | 2003-01-15 | 浙江大学 | Method and equipment for desulfurizing the sulfur-fixating agent of chain furnace by spraying calcium and atomized water |
| CN2589420Y (en) * | 2002-11-26 | 2003-12-03 | 西安建筑科技大学 | Current stabilization cone pump for conveying powdery material |
-
2004
- 2004-05-28 CN CNB2004100247975A patent/CN100350187C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1987007528A1 (en) * | 1986-06-03 | 1987-12-17 | Euroc Research Ab | Method for desulphurising directly flue gas in a furnace |
| DE3922921A1 (en) * | 1989-07-12 | 1991-01-24 | Rwe Energie Ag | Waste incineration plant operation - using limestone injection to suppress hydrogen chloride corrosion |
| JPH0379905A (en) * | 1989-07-28 | 1991-04-04 | Hitachi Zosen Corp | Device to spread uniformly desulfurizing agent in furnace |
| CN1390628A (en) * | 2002-07-17 | 2003-01-15 | 浙江大学 | Method and equipment for desulfurizing the sulfur-fixating agent of chain furnace by spraying calcium and atomized water |
| CN2589420Y (en) * | 2002-11-26 | 2003-12-03 | 西安建筑科技大学 | Current stabilization cone pump for conveying powdery material |
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