CN1704647A - Pneumatic conveying system for spraying calcium in stokehole - Google Patents

Pneumatic conveying system for spraying calcium in stokehole Download PDF

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Publication number
CN1704647A
CN1704647A CN 200410024797 CN200410024797A CN1704647A CN 1704647 A CN1704647 A CN 1704647A CN 200410024797 CN200410024797 CN 200410024797 CN 200410024797 A CN200410024797 A CN 200410024797A CN 1704647 A CN1704647 A CN 1704647A
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CN
China
Prior art keywords
pipe
hopper
limestone powder
calcium
pneumatic conveying
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Granted
Application number
CN 200410024797
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Chinese (zh)
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CN100350187C (en
Inventor
李春萱
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SHANGHAI SINOFINN ELECTRIC ENGINEERING Co Ltd
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SHANGHAI SINOFINN ELECTRIC ENGINEERING Co Ltd
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Priority to CNB2004100247975A priority Critical patent/CN100350187C/en
Publication of CN1704647A publication Critical patent/CN1704647A/en
Application granted granted Critical
Publication of CN100350187C publication Critical patent/CN100350187C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

This invention relates to a front furnace calcium injection delivery system, which comprises bin, upper bucket, lower bucket, auger conveyor and fan, wherein the outlet of the lower bucket connects with the auger conveyor, and the discharge port of the auger conveyor connects with a vertical cut pipe through a level delivery pipe; the air outlet of the fan connects with one air pipe, and the other end of the air pipe connects with the inlet of the transporting material pipe; the lower end of the cut connects to the transporting material pipe, the auger conveyor is driven by the variable-frequency control motor which is connected with the frequency-changer electric. The control device comprises controlling machine, frequency-changer and sulfur dioxide density sensor, which can control the transporting quantity of limestone powder precisely; the auger conveyor can mix the limestone powder and high pressure draught evenly.

Description

Pneumatic conveying system for spraying calcium in front of furnace
Technical Field
The invention relates to a material conveying technology of gas-solid two-phase flow, in particular to a technology for spraying calcium and feeding materials to a circulating fluidized bed boiler and a semi-dry desulphurization furnace, and particularly relates to a stokehole calcium-spraying pneumatic conveying system. A calcium-spraying pneumatic conveying system for desulfurization of coal-fired power plants.
Background
In the prior art, in order to treat sulfur dioxide contained in flue gas discharged by a coal-fired power plant, limestone powder is generally adopted as a desulfurizer, and when the limestone powder is sprayed to a specific temperature zone in a hearth, the limestone powder is heated and decomposed into calcium oxide and carbon dioxide:
then, calcium oxide reacts with partial sulfur dioxide and all sulfur trioxide in the flue gas to generate calcium sulfate, and the flue gas desulfurization effect is achieved:
in the prior art, a circulating fluidized bed boiler and a semi-dry flue gas desulfurization technology are generally utilized, limestone powder is sprayed into a hearth, and in the circulating fluidized bed boiler and the semi-dry flue gas desulfurization technology, a pressure tank is mostly adopted for conveying a desulfurizing agent by high-pressure air. The limestone powder is added into the pressure tank firstly, then the pressure in the pressure tank is pressurized, when the pressure reaches a certain value, the discharge valve on the pressure tank is opened, and the limestone powder is sprayed into the circulating fluidized bed boiler through the discharge hole of the discharge valve. However, the pressure tank conveying method has the following disadvantages:1. the feeding is not uniform, the desulfurization effect is influenced, 2, the energy consumption is high, 3, the metering is not accurate, and the waste of the desulfurizer is easily caused.
The invention content is as follows:
the technical problems to be solved by the invention in the prior art are as follows: in the circulating fluidized bed boiler and the semi-dry flue gas desulfurization technology in the prior art, a pressure tank is mostly adopted for conveying the desulfurizing agent by high-pressure air. Limestone powder needs to be added into the pressure tank firstly, then the pressure in the pressure tank is pressurized, when the pressure reaches a certain value, a discharge valve on the pressure tank is opened, and the limestone powder is sprayed into the circulating fluidized bed boiler through a discharge hole of the discharge valve. This technique therefore has the following disadvantages: 1. the feeding is not uniform, the desulfurization effect is influenced, 2, the energy consumption is high, 3, the metering is not accurate, and the waste of the desulfurizer is easily caused.
The technical scheme adopted by the invention for solving the technical problems in the prior art is to provide a furnace-front calcium-spraying pneumatic conveying system, which comprises a storage bin, an upper hopper, a lower hopper, a screw conveyor and a fan, wherein the screw conveyor is provided with a feeding port and a discharging port, the fan is provided with an air outlet, the upper hopper is arranged above the lower hopper, the upper hopper is communicated with the lower hopper, the storage bin is arranged above the upper hopper, the storage bin is communicated with the upper hopper, the lower hopper is provided with a lower hopper outlet, the lower hopper outlet is connected with the feeding port of the screw conveyor, the discharging port of the screw conveyor is connected with a vertically-arranged blanking pipe through a horizontal conveying pipe, the air outlet of the fan is connected with one end of an air pipe, the other end of the air pipe is connected with the inlet end of a conveying pipe, the lower port of the blanking pipe is connected to the conveying pipe, the spiral conveyor is driven by a variable frequency speed regulating motor, and the variable frequency speed regulating motor is electrically connected with a frequency converter.
Furthermore, the frequency converter is electrically connected with an industrial personal computer, the industrial personal computer is further connected with a sulfur dioxide concentration sensor, and the sulfur dioxide concentration sensor is arranged in a flue between the dust remover and the chimney.
Furthermore, a motor rotating speed detection device is arranged on the variable-frequency speed-regulating motor and is electrically connected with an industrial personal computer. Specifically, the motor speed detection device may adopt an induction type proximity switch or a shaft encoder. The motor rotation speed detection device can more accurately detect the output rotation speed of the motor,
furthermore, the material conveying pipe is provided with an outlet end, and the outlet end is provided with an injection valve.
Furthermore, a first pressure balance pipe is arranged between the upper hopper and the air pipe, and the first pressure balance pipe is communicated with the upper hopper and the air pipe.
Furthermore, a second pressure balance pipe is arranged between the lower hopper and the blanking pipe, and the second pressure balance pipe is communicated with the lower hopper and the blanking pipe.
The first pressure balance pipe and the secondpressure balance pipe can keep the pressure balance in the upper hopper and the lower hopper, so that the blanking is smooth.
Furthermore, a check valve is arranged in a connecting pipeline between the discharge hole of the screw conveyor and the blanking pipe. The check valve prevents high-pressure gas flow in the blanking pipe from flowing into the spiral conveyor.
The invention also provides a calcium-spraying pneumatic conveying method adopted by the stokehole calcium-spraying pneumatic conveying system, which comprises a process of conveying limestone powder into a conveying pipe from a bin and conveying the limestone powder into a boiler from an outlet end of the conveying pipe, wherein the process of conveying the limestone powder into the boiler from the bin to the conveying pipe and conveying the limestone powder into the boiler from the outlet end of the conveying pipe comprises a first step of conveying the limestone powder into an upper hopper from the bin, a second step of conveying the limestone powder into a lower hopper from the upper hopper, a third step of conveying the limestone powder into a feed inlet of a screw conveyor from the lower hopper, and a fourth step of conveying the limestone powder into a blanking pipe from a discharge outlet of the screw conveyor The method also comprises a fifth step of conveying limestone powder into the conveying pipe from the lower port of the blanking pipe and mixing the limestone powder with the high-pressure air flow from the air pipe.
Furthermore, in the third step of conveying limestone powder from the lower hopper to the feed inlet of the screw conveyor, the speed regulation control device is used for controlling the rotating speed of the variable-frequency speed regulation motor.
Furthermore, the frequency converter is electrically connected with an industrial personal computer, the industrial personal computer is further connected with a sulfur dioxide concentration sensor, and the sulfur dioxide concentration sensor is arranged in a flue between the dust remover and the chimney. And the industrial personal computer calculates the amount of limestone powder to be added, outputs the rotating speed value of the variable-frequency speed-regulating motor to the frequency converter, and regulates and controls the rotating speed of the variable-frequency speed-regulating motor.
Furthermore, a motor rotating speed detection device is arranged on the variable-frequency speed-regulating motor and electrically connected with the industrial personal computer, and the rotating speed of the variable-frequency speed-regulating motor is transmitted to the industrial personal computer by the motor rotating speed detection device.
Furthermore, the feed bin, the upper hopper, the lower hopper, the spiral conveyor, the fan, the frequency converter, the variable frequency speed control motor, the sulfur dioxide concentration sensor, the conveying pipe, the blanking pipe, the industrial personal computer, the horizontal conveying pipe, the air pipe, the first pressure balance pipe, the second pressure balance pipe, the induction type proximity switch, the check valve and the injection valve can be realized by adopting the known technical scheme in the prior art, and the feed bin is related to the feed bin, the known technical solutions of the upper hopper, the lower hopper, the screw conveyor, the fan, the frequency converter, the variable frequency speed control motor, the sulfur dioxide concentration sensor, the material conveying pipe, the blanking pipe, the industrial personal computer, the horizontal conveying pipe, the air pipe, the first pressure balance pipe, the second pressure balance pipe, the inductive proximity switch, the check valve and the injection valve in the prior art are well known to those skilled in the art, and therefore, no furtherdescription is given here. In particular, the blower may preferably be a roots blower of the prior art.
Compared with the prior art, the invention has positive and obvious effect. The invention utilizes the variable frequency speed regulating motor to drive the screw conveyer to convey the solid limestone powder, so the conveying capacity can be accurately controlled, and the control device consisting of the industrial personal computer, the frequency converter and the sulfur dioxide concentration sensor can be used for setting the accurate conveying capacity value, meanwhile, the solid limestone powder enters the blanking pipe from the discharge hole of the screw conveyer through the horizontal conveying pipe, so the feeding is uniform, the energy consumption of the screw conveying is low, and the conveying pipe is simultaneously connected with the fan, and the solid limestone powder from the blanking pipe can be uniformly mixed with the high-pressure airflow in the conveying pipe. The invention organically combines precise mechanical conveying and pneumatic conveying together, so that the feeding is uniform and level, the desulfurization effect is improved, the energy consumption is low, the metering is accurate, and the desulfurizer is greatly saved.
Description of the drawings:
FIG. 1 is a schematic view of a stokehole calcium injection pneumatic conveying system of the invention.
The specific implementation mode is as follows:
as shown in figure 1, the stokehole calcium-spraying pneumatic conveying system of the invention comprises a storage bin 3, an upper hopper 4, a lower hopper 5, a screw conveyor 1 and a fan 2, wherein the screw conveyor 1 is provided with a feeding port and a discharging port, the fan 2 is provided with an air outlet, wherein the upper hopper 4 is arranged above the lower hopper 5, the upper hopper 4 is communicated with the lower hopper 5, the storage bin 3 is arranged above the upper hopper 4, the storage bin 3 is communicated with the upper hopper 4, the lower hopper 5 is provided with a lower hopper outlet, the lower hopper outlet is connected with the feeding port of the screw conveyor 1, the discharging port of the screw conveyor 1 is connected with a vertically arranged blanking pipe 7 through a horizontal conveying pipe, and the air outlet of the fan 2 is connected with one end of an air pipe, the other end of the air pipe is connected with the inlet end of a material conveying pipe 8, the lower port of the blanking pipe 7 is connected to the material conveying pipe 8, the spiral conveyor 1 is driven by a variable frequency speed regulating motor, and the variable frequency speed regulating motor is electrically connected with a frequency converter.
Furthermore, the frequency converter is electrically connected with an industrial personal computer, the industrial personal computer is further connected with a sulfur dioxide concentration sensor, and the sulfur dioxide concentration sensor is arranged in a flue between the dust remover and the chimney.
Furthermore, a motor rotating speed detection device is arranged on the variable-frequency speed-regulating motor and is electrically connected with an industrial personal computer. In a preferred embodiment of the present invention, the motor speed detection device employs an inductive proximity switch. The motor rotation speed detection device can more accurately detect the output rotation speed of the motor,
further, the feed delivery pipe 8 has an outlet end, and the outlet end is provided with an injection valve.
Further, a first pressure balance pipe 10 is arranged between the upper hopper 4 and the air pipe, and the first pressure balance pipe 10 is communicated with the upper hopper 4 and the air pipe.
Further, a second pressure balance pipe 6 is arranged between the lower hopper 5 and the blanking pipe 7, and the second pressure balance pipe 6 is communicated with the lower hopper 5 and the blanking pipe 7.
The first pressure balance pipe 10 and the second pressure balance pipe 6 can keep the pressure balance in the upper hopper 4 and the lower hopper 5, so that the blanking is smooth.
Furthermore, a check valve 9 is arranged in a connecting pipeline between the discharge hole of the screw conveyor 1 and the blanking pipe 7. The check valve 9 prevents the high-pressure gas flow in the blanking pipe 7 from flowing into the screw conveyor 1.
The invention also provides a calcium-spraying pneumatic conveying method adopted by the stokehole calcium-spraying pneumatic conveying system, which comprises the following steps of conveying limestone powder from a storage bin 3 to a conveying pipe 8 and conveying the limestone powder into a boiler from the outlet end of the conveying pipe 8: wherein the process of transferring limestone powder from a silo 3 to a feed pipe 8 and from the outlet end of the feed pipe 8 to the boiler comprises a further first step of transferring limestone powder from the silo 3 to the upper hopper 4, a second step of transferring limestone powder from the upper hopper 4 to the lower hopper 5, a third step of transferring limestone powder from the lower hopper 5 to the feed port of the screw conveyor 1, a fourth step of transferring limestone powder from the discharge port of the screw conveyor 1 to the drop pipe 7, and a step of transferring limestone powder from the lower port of the drop pipe 7 to the feed pipe 8, and mixing with the high pressure air flow from said air tube.
Further, in the third step of conveying limestone powder from the lower hopper 5 to the feed inlet of the screw conveyor 1, the speed regulation control device is used for controlling the rotating speed of the variable-frequency speed regulation motor.
Furthermore, the frequency converter is electrically connected with an industrial personal computer, the industrial personal computer is further connected with a sulfur dioxide concentration sensor, and the sulfur dioxide concentration sensor is arranged in a flue between the dust remover and the chimney. And the industrial personal computer calculates the amount of limestone powder to be added, outputs the rotating speed value of the variable-frequency speed-regulating motor to the frequency converter, and regulates and controls the rotating speed of the variable-frequency speed-regulating motor.
Furthermore, a motor rotating speed detection device is arranged on the variable-frequency speed-regulating motor and electrically connected with the industrial personal computer, and the rotating speed of the variable-frequency speed-regulating motor is transmitted to the industrial personal computer by the motor rotating speed detection device.
In one embodiment of the present invention, the transport amount of limestone powder is 9 tons/hour, the bulk specific gravity of limestone powder is 1.3 tons/cubic meter, the horizontal transport distance is 50 meters, the vertical transport distance is 15 meters, the power of the screw conveyor is 1.1 kw, the air blowing amount of the fan is 16 cubic meters/minute, the air blowing pressure of the fan is 50 kpa, the power of the fan is 20 kw, and the diameter of the feed delivery pipe is DN 100.
In another embodiment of the present invention, the transport amount of the limestone powder is 12.6 tons/hour, the bulk specific gravity of the limestone powder is 1.2 to 1.5 tons/cubic meter, the horizontal transport distance is 36 meters, the vertical transport distance is 16 meters, the power of the screw conveyor is 2.2 kw, the blowing amount of the fan is 16 cubic meters/minute, the blowing pressure of the fan is 42 kpa, the power of the fan is 28 kw, and the diameter of the feed delivery pipe is DN 125.

Claims (12)

  1. The utility model provides a stokehold calcium pneumatic conveyor system that spouts, comprises feed bin, upper portion hopper, lower part hopper, screw conveyer and fan, screw conveyer have a feed inlet and a discharge gate, the fan have an air outlet, its characterized in that: the upper hopper is arranged above the lower hopper, the upper hopper is communicated with the lower hopper, the bin is arranged above the upper hopper and is communicated with the upper hopper, the lower hopper is provided with a lower hopper outlet which is connected with the feed inlet of the screw conveyer, the discharge port of the screw conveyer is connected with a vertically arranged blanking pipe through a horizontal conveying pipe, the air outlet of the fan is connected with one end of 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 blanking pipe is connected to the conveying pipe, the spiral conveyor is driven by a variable frequency speed regulating motor, and the variable frequency speed regulating motor is electrically connected with a frequency converter.
  2. The stokehole calcium-spraying pneumatic conveying system according to claim 1, characterized in that: the frequency converter is electrically connected with an industrial personal computer, the industrial personal computer is further connected with a sulfur dioxide concentration sensor, and the sulfur dioxide concentration sensor is arranged in a flue between the dust remover and the chimney.
  3. The stokehole calcium-spraying pneumatic conveying system according to claim 1, characterized in that: the variable-frequency speed-regulating motor is provided with a motor rotating speed detection device, and the motor rotating speed detection device is electrically connected with an industrial personal computer.
  4. The stokehole calcium-spraying pneumatic conveying system according to claim 3, characterized in that: the motor rotating speed detection device is an induction type proximity switch.
  5. The stokehole calcium-spraying pneumatic conveying system according to claim 1, characterized in that: the feed delivery pipe is provided with an outlet end, and the outlet end is provided with an injection valve.
  6. The stokehole calcium-spraying pneumatic conveying system according to claim 1, characterized in that: the upper portion hopper with the air pipe between be provided with a pressure balance pipe, pressure balance pipe intercommunication the upper portion hopper with the air pipe.
  7. The stokehole calcium-spraying pneumatic conveying system according to claim 1, characterized in that: and a second pressure balance pipe is arranged between the lower hopper and the blanking pipe and is communicated with the lower hopper and the blanking pipe.
  8. The stokehole calcium-spraying pneumatic conveying system according to claim 1, characterized in that: and a check valve is arranged in a connecting pipeline between the dischargehole of the screw conveyor and the blanking pipe.
  9. A pneumatic conveying method of calcium blasting for stokehole pneumatic conveying system according to claim 1, comprising a process of conveying limestone powder from a silo to a conveying pipe and from the outlet end of the conveying pipe to a boiler, characterized in that: the process of transferring limestone powder from a silo to a feed pipe and from the outlet end of the feed pipe to a boiler comprises a first step of transferring limestone powder from the silo to the upper hopper, a second step of transferring limestone powder from the upper hopper to the lower hopper, a third step of transferring limestone powder from the lower hopper to the feed port of the screw conveyor, a fourth step of transferring limestone powder from the discharge port of the screw conveyor to the drop pipe, and a fifth step of transferring limestone powder from the lower port of the drop pipe to the feed pipe and mixing the limestone powder with the high-pressure air flow from the air pipe.
  10. The pneumatic conveying method of calcium spraying according to claim 9, characterized in that: in the third step of conveying limestone powder from the lower hopper to the feed inlet of the screw conveyor, the speed regulating control device is used for controlling the rotating speed of the variable-frequency speed regulating motor.
  11. The calcium-blasting pneumatic conveying method according to claim 10, characterized in that: the frequency converter and an industrial computer electric connection, the industrial computer still be connected with a sulfur dioxide concentration sensor, sulfur dioxide concentration sensor set up in the flue between dust remover and chimney, utilize sulfur dioxide concentration sensor obtain sulfur dioxide's concentration parameter from the boiler in to transmit sulfur dioxide's concentration parameter to the industrial computer, again by the industrial computer calculate the limestone powder volume that should add, again by the industrial computer to the frequency converter output frequency conversion speed regulating motor's rotational speed value, regulation and control frequency conversion speed regulating motor's rotational speed.
  12. The calcium-blasting pneumatic conveying method according to claim 11, wherein: the variable-frequency speed-regulating motor is provided with a motor rotating speed detection device, the motor rotating speed detection device is electrically connected with the industrial personal computer, and the motor rotating speed detection device transmits the rotating speed of the variable-frequency speed-regulating motor to the industrial personal computer.
CNB2004100247975A 2004-05-28 2004-05-28 Pneumatic conveying system for spraying calcium in stokehole Expired - Fee Related CN100350187C (en)

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

Applications Claiming Priority (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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Publication Number Publication Date
CN1704647A true CN1704647A (en) 2005-12-07
CN100350187C CN100350187C (en) 2007-11-21

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102145253A (en) * 2010-12-31 2011-08-10 东莞理文造纸厂有限公司 Gas desulfurization system in recirculating fluidized bed boiler
CN101433946B (en) * 2007-10-09 2012-05-09 圣-戈班Pam集团公司 Device for transporting powder, corresponding casting equipment and method
CN102705815A (en) * 2012-05-08 2012-10-03 佛山市沛沣科技有限公司 Powder combustion device
CN103197549A (en) * 2013-03-04 2013-07-10 华北电力大学 Soft measurement method and optimal control method of sulfur dioxide in circulating fluidized bed boiler smoke

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE456642B (en) * 1986-06-03 1988-10-24 Euroc Research Ab SET FOR DIRECT DESULATING OF SMOKE GAS IN AN OLD TOWN
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
CN1162208C (en) * 2002-07-17 2004-08-18 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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101433946B (en) * 2007-10-09 2012-05-09 圣-戈班Pam集团公司 Device for transporting powder, corresponding casting equipment and method
CN102145253A (en) * 2010-12-31 2011-08-10 东莞理文造纸厂有限公司 Gas desulfurization system in recirculating fluidized bed boiler
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
CN103197549A (en) * 2013-03-04 2013-07-10 华北电力大学 Soft measurement method and optimal control method of sulfur dioxide in circulating fluidized bed boiler smoke
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

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