CN102072484B - Discharged material return circulation control device for fluidized coal gasifier and application thereof - Google Patents
Discharged material return circulation control device for fluidized coal gasifier and application thereof Download PDFInfo
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- CN102072484B CN102072484B CN2010105645832A CN201010564583A CN102072484B CN 102072484 B CN102072484 B CN 102072484B CN 2010105645832 A CN2010105645832 A CN 2010105645832A CN 201010564583 A CN201010564583 A CN 201010564583A CN 102072484 B CN102072484 B CN 102072484B
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Abstract
The invention discloses a discharged material return circulation control device for a fluidized coal gasifier, comprising pressure measuring holes (2), a heat exchanger (18), temperature measuring holes (3), a mechanical valve (4) and a pneumatic control valve (17). The device is characterized in that a vertical tube (1) is provided with two pressure measuring holes (2), the heat exchanger (18) and two temperature measuring holes (3); the heat exchanger (18) is provided with a water inlet (19) and a water outlet (20); a first temperature measuring hole is arranged above the heat exchanger (18); a second temperature measuring hole is arranged below the heat exchanger (18); the two pressure measuring holes (2) are positioned above the first temperature measuring hole; the lower end of the vertical tube (1) is connected with the mechanical valve (4); and the lower end of the mechanical valve (4) is connected with the pneumatic control valve (17) through a charge tube (5). The device has the advantages of being simple in structure and simple and convenient for operation, and is suitable for the discharged material return demand of the fluidized coal gasifier in various conditions.
Description
Technical field
The invention belongs to a kind of fluidized-bed gasification furnace that is used for takes material out of and under high pressure, high temperature, various condition, returns stove EGR and application.
Technical background
The fluidized gasification technology worldwide is used widely as clean coal technology of new generation, at present the positive pressurization large scale development.Along with the increase of pressurized-gasification furnace treating capacity, the fluidized-bed gasification furnace furnace roof is taken the semicoke fine powder amount out of and is increased thereupon.Be to solve the gasification efficiency of fluidized-bed gasification furnace semicoke fine powder, must take material out of through gasification furnace and repeatedly return stove and improve its transformation efficiency.
The fine powder circulation of taking out of in the fluidized-bed gasification furnace is to lean on solid particle recycle system control circular flow and keep necessary material envelope; It mainly is made up of standpipe and material-returning device returning charge valve; The effect of standpipe is the Negative Pressure Difference between the enough pressure heads of formation come in balance cyclone separator and the gasification furnace; Keep and the steady flow in the circulatory system of control recycle stock, simultaneously rational standpipe sectional area is controlled at the decrease speed of material in the standpipe in the scope of permission.Material-returning device then plays the effect of adjusting of conveying, the returning charge amount of switching, the recycle stock of control material circulation.
Fluidized-bed gasification furnace is different from combustion furnace (boiler), and taking material out of is the coal semicoke, and carbon containing is high, and circulating ratio is less, and mechanical valve, Pneumatic valve all have application in the material-returning device, and pluses and minuses are respectively arranged.The advantage of mechanical valve is that control characteristic is good, the operation control and regulation are flexible; But flow owing under high temperature, hyperbaric environment, regulate powder material for a long time, be easy to generate jam, abrasion phenomenon, adjusting function and service life are restricted.Pneumatic valve adopts different inflation modes and regulates the switching that aeration quantity controls material-returning device and regulate mass flow, has prolonged the service life of valve, and the valve manufacturing also more easily thereby on recirculating fluidized bed combustion system, obtained using widely; But the sealing of Pneumatic valve is relatively poor, can not open the effect of material envelope, especially big pressure reduction and low the circulating ratio ratio of gasification furnace inlet amount (internal circulating load with) start down and control difficult, the structure of existing Pneumatic valve can not satisfy the requirement of high pressure in addition.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structurely, easy and simple to handle, be applicable to that fluidized-bed gasification furnace is taken material out of under the various conditions to return stove cycler and application.
Principle of the present invention is to adopt mechanical valve to set up or control standpipe material level, through the material level in the pressure tap judgement standpipe; Utilize water leg and point for measuring temperature to confirm the fluidized gas that move down speed, adjusting Pneumatic valve, loosening gas and the side-blown gas of material in standpipe, realize control the material circulating ratio that gets into Pneumatic valve.The effect of mechanical valve is to set up material level and material level is slightly controlled, and the effect of Pneumatic valve is the accurate control of material level.
Fluidized-bed gasification furnace of the present invention is taken material out of and is returned the stove cycler and be made up of pressure taps, heat exchanger, point for measuring temperature, mechanical valve and Pneumatic valve; It is characterized in that having on the standpipe two pressure taps, heat exchanger and two temperature-measuring ports have water inlet and delivery port on the heat exchanger; First temperature-measuring port is arranged on the heat exchanger; Second temperature-measuring port under the heat exchanger, two pressure taps are positioned on first temperature-measuring port, and the lower end of standpipe is connected with mechanical valve; The mechanical valve lower end links to each other with Pneumatic valve through feed pipe.
Described Pneumatic valve is a cylindrical structure, and the centre in Pneumatic valve is provided with baffle plate, and the upper end of baffle plate links to each other with the Pneumatic valve top; One passage is formed on the lower end of baffle plate and Pneumatic valve bottom, and baffle plate is separated into the returning charge chamber and the material supply chamber of two connections with Pneumatic valve inside, and what link to each other with the feed pipe bottom is the material supply chamber; At the material supply chamber side air blowing tube is arranged, side air blowing tube and passage are on same horizontal level, and returning charge is indoor to have a dividing plate; The dividing plate lower end links to each other with bottom, returning charge chamber, and the dividing plate upper end forms another passage with top, returning charge chamber, and the returning charge inclined tube links to each other with the returning charge chamber; Bottom, returning charge chamber between dividing plate and the baffle plate is an air distribution plate, and the bottom of material supply chamber is an air distribution plate, loosening air chamber and returning charge air chamber is set below the air distribution plate respectively; Loosening air chamber links to each other with the material supply chamber; The returning charge air chamber links to each other with the returning charge chamber, and loosening tracheae links to each other with loosening air chamber, and the fluidisation tracheae links to each other with the returning charge air chamber.
The spacing of aforesaid two pressure taps is 0.8-1.2m.
The sectional area of the lower end of aforesaid baffle plate and Pneumatic valve bottom formation one passage and the ratio of feed pipe sectional area should be between 0.8-1.2.
Fluidized-bed gasification furnace of the present invention is taken material out of, and to return the application process of stove cycler following:
When (1) fluidized-bed gasification furnace brings into operation, flow downward through standpipe, at first close mechanical valve and save bit by bit material level from the HTHP ash of cyclone separator;
When (2) two pressure taps pressure reduction are 0.2～0.8kPa, feed water to heat exchanger, mechanical valve opens 40～100% simultaneously; When circulating ratio＜5, mechanical valve is opened 40-45%, during circulating ratio 5-10; Mechanical valve is opened about 65-75%, and during circulating ratio 10-20, mechanical valve is opened 90-100%;
(3) after mechanical valve is opened; At first earlier the returning charge chamber is inflated with fluidized gas; Make the material in the returning charge chamber be in fluidized state; Then with becoming flexible gas or side-blown gas to the ascending inflation of material supply chamber; In the Pneumatic valve course of work; The internal circulating load of fluidized gas, loosening gas and side-blown gas associating ventilating control material, thus make material get into the returning charge inclined tube;
(4) through measuring two temperature-measuring port temperature spot T
1, T
2, calculate the internal circulating load that moves down material in the standpipe through formula;
Formula is: Q
Burnt=Q
WaterC
Water(T
Water inlet-T
Water outlet)/(C
Burnt(T
1-T
2))
Q
WaterBe the water yield of heat exchanger 18, C
WaterBe specific heat of water, T
Water inletBe inflow temperature, T
Water outletBe the heat exchanger leaving water temperature; Q
BurntFor moving down the internal circulating load of material, C
BurntBe the specific heat of material, T
1Be the temperature that material gets into heat exchanger, T
2Get into the temperature of heat exchanger for material; According to calculating the internal circulating load that moves down material in the standpipe; Move down the internal circulating load of material if calculate the internal circulating load that moves down material greater than expection, then through regulating fluidized gas, loosening gas and side-blown gas; Reduce total tolerance, make it to reach the internal circulating load that expection moves down material; Move down the internal circulating load of material if calculate the internal circulating load that moves down material less than expection, then through regulating fluidized gas, loosening gas and side-blown gas strengthen total tolerance, make it to reach the internal circulating load that expection moves down material, thereby realize the accurately internal circulating load of control material.
(5) fluidized-bed gasification furnace is out of service, at first closes mechanical valve, stops material and gets into Pneumatic valve; Close the fluidized gas of Pneumatic valve, loosening gas and side-blown gas then; Close the heat exchanger water inlet.
Aforesaid fluidized-bed gasification furnace is taken material out of, and to return the stove cycler can be normal temperature-1100 ℃ in temperature; Pressure normal pressure-6.0MPa uses, and the ratio that reaches the inventory internal circulating load that makes outer circulation and gasification furnace inlet amount be circulating ratio 0.5～20: regulate between 1.
Advantage of the present invention is:
(1) apparatus structure is simple, and is easy and simple to handle, can quantitatively control;
(2) start easily, can prevent the gas short circuit, safe and reliable;
(3) circulating ratio wide ranges goes for various raw material fluidized gasifications;
(4) can satisfy the loop control of HTHP material.
Description of drawings
Fig. 1 takes the structural representation that material returns the stove cycler out of for fluidized-bed gasification furnace of the present invention
Fig. 2 takes the structure front elevational schematic that material returns stove cycler Pneumatic valve out of for fluidized-bed gasification furnace of the present invention
Fig. 3 takes the structure schematic top plan view that material returns stove cycler Pneumatic valve out of for fluidized-bed gasification furnace of the present invention
As shown in the figure, 1 standpipe, 2 pressure taps, 3 temperature-measuring ports, 4 mechanical valve, 5 feed pipes, 6 material supply chambers, 7 baffle plates, 8 air distribution plates, 9 side air blowing tubes, 10 loosening air chambers, 11 loosening tracheaes, 12 fluidisation tracheaes, 13 returning charge air chambers, 14 returning charge inclined tubes, 15 dividing plates, returning charge chambers 16,17 Pneumatic valves, 18 heat exchangers, 19 water inlets, 20 delivery ports.
The specific embodiment
Fluidized-bed gasification furnace is taken material out of and is returned the stove cycler and be made up of pressure taps 2, heat exchanger 18, temperature-measuring port 3, mechanical valve 4 and Pneumatic valve 17; It is characterized in that two pressure taps 2 are arranged on the standpipe 1, heat exchanger 18 and two temperature-measuring ports 3 have water inlet 19 and delivery port 20 on the heat exchanger 18; First temperature-measuring port is arranged on the heat exchanger 18; Second temperature-measuring port under the heat exchanger 18, two pressure taps 2 are positioned on first temperature-measuring port, and the lower end of standpipe 1 is connected with mechanical valve 4; Mechanical valve 4 lower ends link to each other with Pneumatic valve 17 through feed pipe 5.
Described Pneumatic valve 17 is a cylindrical structure, and the centre in Pneumatic valve 17 is provided with baffle plate 7, and the upper end of baffle plate 7 links to each other with Pneumatic valve 17 tops; One passage is formed on the lower end of baffle plate 7 and Pneumatic valve 17 bottoms, and baffle plate 7 is separated into Pneumatic valve inside the returning charge chamber 16 and material supply chamber 6 of two connections, and what link to each other with feed pipe 5 bottoms is material supply chamber 6; At material supply chamber 6 side air blowing tube 9 is arranged, side air blowing tube 9 and passage have a dividing plate 15 in the returning charge chamber 16 on same horizontal level; Dividing plate 15 lower ends link to each other with 16 bottoms, returning charge chamber, and another passage is formed on dividing plate 15 upper ends and 16 tops, returning charge chamber, and returning charge inclined tube 14 links to each other with returning charge chamber 16; 16 bottoms, returning charge chamber between dividing plate 15 and the baffle plate 7 are air distribution plates 8, and the bottom of material supply chamber 6 is air distribution plates 8, and loosening air chamber 10 and returning charge air chamber 13 are set respectively below the air distribution plate 8; Loosening air chamber 10 links to each other with material supply chamber 6; Returning charge air chamber 13 links to each other with returning charge chamber 16, and loosening tracheae 11 links to each other with loosening air chamber 10, and fluidisation tracheae 12 links to each other with returning charge air chamber 13.
Embodiment 1
The gasification furnace inlet amount is 2000kg/h; Requiring the circulating ratio of material in the standpipe is 2 ± 1; Internal circulating load 2000-6000kg/h; Operation as follows during operating mode: when fluidized-bed gasification furnace brings into operation, flow downward through standpipe 1 from the HTHP ash of cyclone separator, at first close mechanical valve 4 and save bit by bit material level; Two pressure taps 2 are carried out pressure measurement; When the pressure reduction between two pressure taps is 0.2-0.3kPa; Feed water for heat exchanger 18, mechanical valve 4 opens 40% simultaneously, and at first gas is inflated from 13 pairs of returning charge chambers 16 of fluidisation tracheae 12 entering fluidisation air chambers; Make the material in the returning charge chamber 16 be in fluidized state, fluidization gas is 120Nm
3/ h, then gas is loosening from the material that loosening tracheae 11 gets into loosening 10 pairs of material supply chambers 6 of air chamber, and loosening tolerance is 110Nm
3/ h carries to returning charge chamber 16 material of material supply chamber 6 from the gas that side air blowing tube 9 gets into, and side-blown tolerance is 90Nm
3/ h,
Calculate the internal circulating load that moves down material in the standpipe through formula:
Formula is: Q
Burnt=Q
WaterC
Water(T
Water inlet-T
Water outlet)/(C
Burnt(T
1-T
2))
Q
WaterBe the water yield of heat exchanger 18, be 500kg/h, C
WaterBe specific heat of water, be 4.2kJ/ (kg ℃) that the T water inlet is 20 ℃ for inflow temperature, T
Water outletBe heat exchanger leaving water temperature, Q
BurntFor material moves down flow, C
BurntBe the specific heat of material, be 1.38kJ/ (kg ℃), T
1Be the temperature of first temperature-measuring port, T
2It is the temperature of second temperature-measuring port;
To move down the temperature T 1 that material gets into before the heat exchanger 18 be 850 ℃ through measuring, and the temperature of charge T2 that goes out heat exchanger 18 is 820 ℃, the temperature T of delivery port 20
Water outletBeing 50 ℃, is 1521kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, moves down the internal circulating load of material less than expection, then increases total tolerance, and making fluidization gas is 140Nm
3/ h, loosening tolerance is 130Nm
3/ h, side-blown tolerance is 100Nm
3/ h.
Measuring once more and moving down material entering heat exchanger 18 preceding temperature T 1 is 850 ℃, and the temperature of charge T2 that goes out heat exchanger 18 is 835 ℃, the temperature T of delivery port 20
Water outletBeing 80 ℃, is 7608kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, moves down the internal circulating load of material greater than expection, then reduces total tolerance, and making fluidization gas is 133Nm
3/ h, loosening tolerance is 120Nm
3/ h, side-blown tolerance is 95Nm
3/ h.
Measuring for the third time and moving down material entering heat exchanger 18 preceding temperature T 1 is 850 ℃, and the temperature of charge T2 that goes out heat exchanger 18 is 834 ℃, the temperature T of delivery port 20
Water outletBeing 60 ℃, is 3804kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, reaches the internal circulating load that expection moves down material.
Fluidized-bed gasification furnace is out of service, at first closes mechanical valve 4, stops material and gets into Pneumatic valve 17; Close the fluidized gas of Pneumatic valve 17, loosening gas and side-blown gas then; Close heat exchanger 18 water inlets.
The gasification furnace inlet amount is 1000kg/h; Requiring the circulating ratio of material in the standpipe is 8 ± 1; Internal circulating load 7000～9000kg/h; Operation as follows during operating mode: when fluidized-bed gasification furnace brings into operation, flow downward through standpipe 1 from the HTHP ash of cyclone separator, at first close mechanical valve 4 and save bit by bit material level; Two pressure taps 2 are carried out pressure measurement; When the pressure reduction between two pressure taps is 0.5-0.6kPa; Feed water for heat exchanger 18, mechanical valve 4 opens 70% simultaneously, and at first gas is inflated from 13 pairs of returning charge chambers 16 of fluidisation tracheae 12 entering fluidisation air chambers; Make the material in the returning charge chamber 16 be in fluidized state, fluidization gas is 500Nm
3/ h, then gas is loosening from the material that loosening tracheae 11 gets into loosening 10 pairs of material supply chambers 6 of air chamber, and loosening tolerance is 400Nm
3/ h carries to returning charge chamber 16 material of material supply chamber 6 from the gas that side air blowing tube 9 gets into, and side-blown tolerance is 300Nm
3/ h,
Calculate the internal circulating load that moves down material in the standpipe through formula:
Formula is: Q
Burnt=Q
WaterC
Water(T
Water inlet-T
Water outlet)/(C
Burnt(T
1-T
2))
Q
WaterBe the water yield of heat exchanger 18, be 1000kg/h, C
WaterBe specific heat of water, be 4.2kJ/ (kg ℃), T
Water inletBeing inflow temperature, is 20 ℃, T
Water outletBe heat exchanger leaving water temperature, Q
BurntFor material moves down flow, C
BurntBe the specific heat of material, be 1.38kJ/ (kg ℃), T
1Be the temperature of first temperature-measuring port, T
2It is the temperature of second temperature-measuring port;
To move down the temperature T 1 that material gets into before the heat exchanger 18 be 850 ℃ through measuring, and the temperature of charge T2 that goes out heat exchanger 18 is 835 ℃, the temperature T of delivery port 20
Water outletBeing 48 ℃, is 5681kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, moves down the internal circulating load of material less than expection, then increases total tolerance, and making fluidization gas is 550Nm
3/ h, loosening tolerance is 420Nm
3/ h, side-blown tolerance is 330Nm
3/ h.
Measuring once more and moving down material entering heat exchanger 18 preceding temperature T 1 is 850 ℃, and the temperature of charge T2 that goes out heat exchanger 18 is 837 ℃, the temperature T of delivery port 20
Water outletBeing 56 ℃, is 8428kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, reaches the internal circulating load that expection moves down material.
Fluidized-bed gasification furnace is out of service, at first closes mechanical valve 4, stops material and gets into Pneumatic valve 17; Close the fluidized gas of Pneumatic valve 17, loosening gas and side-blown gas then; Close heat exchanger 18 water inlets.
The gasification furnace inlet amount is 800kg/h; Requiring the circulating ratio of material in the standpipe is 16 ± 1; Internal circulating load 12000～13600kg/h; Operation as follows during operating mode: when fluidized-bed gasification furnace brings into operation, flow downward through standpipe 1 from the HTHP ash of cyclone separator, at first close mechanical valve 4 and save bit by bit material level; Two pressure taps 2 are carried out pressure measurement; When the pressure reduction between two pressure taps 2 is 0.5-0.6kPa; Feed water for heat exchanger 18, mechanical valve 4 opens 100% simultaneously, and at first gas is inflated from 13 pairs of returning charge chambers 16 of fluidisation tracheae 12 entering fluidisation air chambers; Make the material in the returning charge chamber 16 be in fluidized state, fluidization gas is 650Nm
3/ h, then gas is loosening from the material that loosening tracheae 11 gets into loosening 10 pairs of material supply chambers 6 of air chamber, and loosening tolerance is 530Nm
3/ h carries to the returning charge chamber the material of material supply chamber 6 from the gas that side air blowing tube 9 gets into, and side-blown tolerance is 420Nm
3/ h,
Calculate the internal circulating load that moves down material in the standpipe through formula:
Formula is: Q
Burnt=Q
WaterC
Water(T
Water inlet-T
Water outlet)/(C
Burnt(T
1-T
2))
Q
WaterBe the water yield of heat exchanger 18, be 2000kg/h, C
WaterBe specific heat of water, be 4.2kJ/ (kg ℃), T
Water inletBeing inflow temperature, is 20 ℃, T
Water outletBe heat exchanger leaving water temperature, Q
BurntFor material moves down flow, C
BurntBe the specific heat of material, be 1.38kJ/ (kg ℃), T
1Be the temperature of first temperature-measuring port, T
2It is the temperature of second temperature-measuring port;
To move down the temperature T 1 that material gets into before the heat exchanger 18 be 850 ℃ through measuring, and the temperature of charge T2 that goes out heat exchanger 18 is 838 ℃, the temperature T of delivery port 20
Water outletBeing 52 ℃, is 16231kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, moves down the internal circulating load of material greater than expection, then reduces total tolerance, and making fluidization gas is 620Nm
3/ h, loosening tolerance is 500Nm
3/ h, side-blown tolerance is 400Nm
3/ h.
Measuring once more and moving down material entering heat exchanger 18 preceding temperature T 1 is 850 ℃, and the temperature of charge T2 that goes out heat exchanger 18 is 836 ℃, the temperature T of delivery port
Water outletBeing 48 ℃, is 12173kg/h according to calculating the internal circulating load that moves down material in the standpipe 1, reaches the internal circulating load that expection moves down material.
Fluidized-bed gasification furnace is out of service, at first closes mechanical valve 4, stops material and gets into Pneumatic valve 17; Close the fluidized gas of Pneumatic valve 17, loosening gas and side-blown gas then; Close heat exchanger 18 water inlets.
Claims (6)
1. a fluidized-bed gasification furnace is taken material out of and is returned the stove cycler; It is by being made up of pressure taps (2), heat exchanger (18), temperature-measuring port (3), mechanical valve (4) and Pneumatic valve (17); It is characterized in that heat exchanger (18), two pressure taps (2) and two temperature-measuring ports (3) are arranged on the standpipe (1); Water inlet (19) and delivery port (20) are arranged on the heat exchanger (18), and heat exchanger is provided with first temperature-measuring port on (18), is provided with second temperature-measuring port under the heat exchanger (18); Two pressure taps (2) are positioned on first temperature-measuring port, and the lower end of standpipe (1) is connected with mechanical valve (4); Mechanical valve (4) lower end links to each other with Pneumatic valve (17) through feed pipe (5).
2. a kind of fluidized-bed gasification furnace as claimed in claim 1 is taken material out of and is returned the stove cycler, and the spacing that it is characterized in that described two pressure taps (2) is 0.8-1.2m.
3. a kind of fluidized-bed gasification furnace as claimed in claim 1 is taken material out of and is returned the stove cycler, it is characterized in that described Pneumatic valve (17) is a cylindrical structure, and the centre in Pneumatic valve (17) is provided with baffle plate (7); The upper end of baffle plate (7) links to each other with Pneumatic valve (17) top, and a passage is formed on the lower end of baffle plate (7) and Pneumatic valve (17) bottom, and baffle plate (7) is separated into two with Pneumatic valve inside and is communicated with chamber; Be returning charge chamber (16) and material supply chamber (6), what link to each other with feed pipe (5) bottom is material supply chamber (6), at material supply chamber (6) side air blowing tube (9) is arranged; Side air blowing tube (9) and said passage are on same horizontal level; One dividing plate (15) is arranged in the returning charge chamber (16), and dividing plate (15) lower end links to each other with returning charge chamber (16) bottom, and dividing plate (15) upper end forms another passage with top, returning charge chamber (16); Returning charge inclined tube (14) links to each other with returning charge chamber (16); Bottom, returning charge chamber (16) between dividing plate (15) and the baffle plate (7) is air distribution plate (8), and the bottom of material supply chamber (6) is air distribution plate (8), loosening air chamber (10) and returning charge air chamber (13) is set below the air distribution plate (8) respectively; Loosening air chamber (10) links to each other with material supply chamber (6); Returning charge air chamber (13) links to each other with returning charge chamber (16), and loosening tracheae (11) links to each other with loosening air chamber (10), and fluidisation tracheae (12) links to each other with returning charge air chamber (13).
4. a kind of fluidized-bed gasification furnace as claimed in claim 3 is taken material out of and is returned the stove cycler, and the ratio of sectional area and feed pipe (5) sectional area that it is characterized in that the said passage that lower end and Pneumatic valve (17) bottom of described baffle plate (7) forms is between 0.8-1.2.
5. take the application that material returns the stove cycler out of like each described a kind of fluidized-bed gasification furnace of claim 1-4, it is characterized in that comprising the steps:
When (1) fluidized-bed gasification furnace brings into operation, flow downward through standpipe (1), at first close mechanical valve (4) and save bit by bit material level from the HTHP ash of cyclone separator;
When (2) two pressure taps (2) pressure reduction is 0.2～0.8kPa, feed water to heat exchanger, mechanical valve (4) opens 40～100% simultaneously; When circulating ratio＜5; Mechanical valve (4) is opened 40-45%, and during circulating ratio 5-10, mechanical valve (4) is opened about 65-75%; During circulating ratio 10-20, mechanical valve (4) is opened 90-100%;
(3) after mechanical valve (4) is opened; At first earlier returning charge chamber (16) are inflated with fluidized gas; Make the material in the returning charge chamber (16) be in fluidized state; Then with becoming flexible gas and side-blown gas to the ascending inflation of material supply chamber (6); In Pneumatic valve (17) course of work; The internal circulating load of fluidized gas, loosening gas and side-blown gas associating ventilating control material, thus make material get into returning charge inclined tube (14);
(4) through measuring two temperature-measuring ports (2) temperature spot T
1, T
2, calculate the internal circulating load that moves down material in the standpipe through formula;
Formula is: Q
Burnt=Q
WaterC
Water(T
Water inlet-T
Water outlet)/(C
Burnt(T
1-T
2))
Q
WaterBe the water yield of heat exchanger (18), C
WaterBe specific heat of water, T
Water inletBe inflow temperature, T
Water outletBe heat exchanger (18) leaving water temperature; Q
BurntFor moving down the internal circulating load of material, C
BurntBe the specific heat of material, T
1Be the temperature of first temperature-measuring port, T
2It is the temperature of second temperature-measuring port; According to calculating the internal circulating load that moves down material in the standpipe (1); Move down the internal circulating load of material if calculate the internal circulating load that moves down material greater than expection, then through regulating fluidized gas, loosening gas and side-blown gas; Reduce total tolerance, make it to reach the internal circulating load that expection moves down material; Move down the internal circulating load of material if calculate the internal circulating load that moves down material less than expection, then through regulating fluidized gas, loosening gas and side-blown gas strengthen total tolerance, make it to reach the internal circulating load that expection moves down material, thereby realize the accurately internal circulating load of control material;
(5) fluidized-bed gasification furnace is out of service, at first closes mechanical valve (4), stops material and gets into Pneumatic valve (17); Close the fluidized gas of Pneumatic valve (17), loosening gas and side-blown gas then; Close heat exchanger (18) water inlet.
6. a kind of fluidized-bed gasification furnace as claimed in claim 5 is taken the application that material returns the stove cycler out of; It is characterized in that taking material out of by described fluidized-bed gasification furnace, to return the stove cycler be normal temperature to 1100 ℃ in temperature; The pressure normal pressure uses to 6.0MPa, and the ratio that reaches the inventory internal circulating load that makes outer circulation and gasification furnace inlet amount be circulating ratio 0.5～20: regulate use between 1.
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|---|---|---|---|
| CN2010105645832A CN102072484B (en) | 2010-11-25 | 2010-11-25 | Discharged material return circulation control device for fluidized coal gasifier and application thereof |
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|---|---|---|---|
| CN2010105645832A CN102072484B (en) | 2010-11-25 | 2010-11-25 | Discharged material return circulation control device for fluidized coal gasifier and application thereof |
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| CN104879749A (en) * | 2015-05-27 | 2015-09-02 | 贵州电力试验研究院 | Material return device anti-blocking device for CFB boiler, and operation method thereof |
| CN110056866B (en) * | 2018-04-16 | 2024-02-09 | 新能能源有限公司 | Fluidized bed secondary cyclone return device and cyclone return control method |
| CN113155217B (en) * | 2021-01-27 | 2023-03-24 | 清华大学 | Method and system for measuring solid circulation flow rate of thermal state circulating fluidized bed |
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| SE455726B (en) * | 1986-12-11 | 1988-08-01 | Goetaverken Energy Ab | PROCEDURE FOR REGULATING THE COOL EFFECT OF PARTICLE COOLERS AND PARTICLE COOLERS FOR BOILERS WITH CIRCULATING FLUIDIZED BED |
| US5682828A (en) * | 1995-05-04 | 1997-11-04 | Foster Wheeler Energy Corporation | Fluidized bed combustion system and a pressure seal valve utilized therein |
| JP2001248816A (en) * | 2000-03-08 | 2001-09-14 | Mitsubishi Heavy Ind Ltd | Seal pot |
| CN1304783C (en) * | 2001-12-22 | 2007-03-14 | 浙江大学 | Wind control type material outside circulating device of circulating fluid bed boiler |
| CN2593064Y (en) * | 2002-12-17 | 2003-12-17 | 重庆市节能技术服务中心 | Boiler primary air pressurized dense-phase zone charge returning apparatus |
| JP2004316938A (en) * | 2003-04-11 | 2004-11-11 | Chugai Ro Co Ltd | Heat recovering equipment and heat recovering method of circulated fluidized bed incinerator |
| FI116417B (en) * | 2004-07-01 | 2005-11-15 | Kvaerner Power Oy | Boiler with circulating fluidized bed |
| CN100427825C (en) * | 2005-09-13 | 2008-10-22 | 中国科学院工程热物理研究所 | Pneumatic controlling ash-in external heat exchanger |
| US7770543B2 (en) * | 2007-08-29 | 2010-08-10 | Honeywell International Inc. | Control of CFB boiler utilizing accumulated char in bed inventory |
| CN101255987B (en) * | 2008-02-04 | 2011-07-20 | 浙江大学 | Circulating system of combustion gasification materiel for double fluidized bed |
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