CN102382976B - Fluidized boiling roasting furnace - Google Patents

Fluidized boiling roasting furnace Download PDF

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Publication number
CN102382976B
CN102382976B CN 201110350485 CN201110350485A CN102382976B CN 102382976 B CN102382976 B CN 102382976B CN 201110350485 CN201110350485 CN 201110350485 CN 201110350485 A CN201110350485 A CN 201110350485A CN 102382976 B CN102382976 B CN 102382976B
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slag
chamber
air
rear chamber
boiling
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CN102382976A (en
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张元松
潘庆洋
邱红侠
顾广龙
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JIANYE QINGSONG GROUP CO Ltd
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JIANYE QINGSONG GROUP CO Ltd
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Abstract

The invention discloses a fluidized boiling roasting furnace. The fluidized boiling roasting furnace has high capacity and higher heat recovery efficiency, and does not directly convey the return air containing a large amount of ash to a hearth of the upper part. A slag outlet is connected with a slag overflow port through a heat exchange type rear chamber boiling bed; the heat exchange type rear chamber boiling bed comprises a rear chamber boiling bed body, an air chamber device and a heat exchange device; the rear chamber boiling bed body comprises a body with a hollow chamber, a slag inlet and a slag discharge hole; the air chamber device is arranged at the bottom of the body, and blows air into the chamber of the body; the heat exchange device comprises a cooling pipe bundle, and the cooling pipe bundle extends into the chamber of the body and is in full contact with the flowing slag in the chamber of the body; the slag discharge hole is connected with the slag overflow port; the slag inlet is connected with the slag outlet at the side of a boiling bed layer; and the slag inlet serves as an air flue for guiding the air in the rear chamber boiling bed body into the boiling bed layer. The fluidized boiling roasting furnace is fuller in combustion. The economic benefit and the utilization rate of heat are improved. The slag discharge temperature is greatly reduced. The fluidized boiling roasting furnace is compact in structure, small in floor area, simple and convenient in installation and safe in operation.

Description

A kind of fluidization fluidizing reactor
Technical field
The present invention relates to the fluidizing reactor of sulfurous iron ore, sulfuric acid sulphuric acid plant; Relate in particular to this kind fluidizing reactor slag tap the part improvement.
Background technology
Fluidization fluidizing reactor is one of major equipment of sulfurous iron ore, zinc ore concentrate sulphuric acid plant calcining process, and the stove shape mainly contains two kinds on straight barrel type and top expansion type.The straight barrel type fluidizing reactor is multiplex, and intensity of roasting is low in the roasting in non-ferro metals floatation ore deposit, and the fluidizing furnace of top expansion type is used for the roasting of sulfurous iron ore mostly because of intensity of roasting, and China's most of ore deposit stoving oven belongs to this type.
Conventional fluidized bed roasting furnace body is that box hat liner insulating brick serves as a contrast firebrick structure (containing insulating brick liner 1, fireproof brick inner lining 2) again.Shown in Fig. 6,7, whole body of heater can be divided into several parts, and top is burner hearth, comprises boiling bed 8, middle part expanding reach and upper furnace 7.Cooling water tank 9 is housed in the siege, to remove the waste heat of boiling bed 8, reduces the temperature of boiling bed 8 walls.The conical section of middle part for upwards enlarging, the area of the sectional area ratio boiling bed 8 of upper furnace 7 is large, to fall low gas velocity and to reduce solids and take out of.The bottom is that wind box is lower air chamber 3, is provided with air intlet pipe 4, and middle across a dispersion plate 5, the upper refractory concrete is embedded with many dispersion plate blast caps 6.Body of heater also is provided with the adapters such as charging opening 10, slag overflow port 11, furnace gas export 12, secondary air inlet 13, lighting-up tuyere 14, safety vent mouth 15 in addition.
The roasting process in ore deposit just carries out in burner hearth, and feeding machine is sent qualified ore deposit into fluidizing reactor, with the air boiling roasting that blower fan is sent here, and 850~950 ℃ of control fluidized layer temperatures.About 920 ℃ of fluidizing reactor Outlet Gas Temperature enters waste heat boiler cooling and reclaims heat, and 900 ℃ of high temperature furnace slags that the fluidizing reactor overflow port is discharged enter cooling system.From the enterprise operation situation, many existence cause stopping because of fluidizing reactor dreg removing system fault.The reason of high fault mainly is:
1, discharges the slag temperature height, carry the stainless steel pipes material fragile;
2, fluidizing furnace overflow port and cooling apparatus distance, the connecting conveying pipe road is long, stops up easily;
3, the discontinuous cooling apparatus that causes of deslagging is uneven in temperature, and weld seam expands with heat and contract with cold easy to crack.
Frequent maintenance affects the driving rate of system, and maintenance has increased system operation cost, and there is potential safety hazard in system's long-period stable operation.From resource and environmental angle, also there is following problem in addition:
1, thermosteresis is large, and 900 ℃ of cooling of furnace slags adopt about spray cooling to 400 ℃ more and see off, and slag heat does not reclaim, and has caused energy dissipation.
2, the cooling deslagging need to consume a large amount of water, and production environment is polluted.
3, operation link is many, relates to deslagging, conveying, trickle cooling, blowdown adjusting, and technique and control are complicated.
The application for a patent for invention file that the disclosed publication number of the 1998.10.18. of State Intellectual Property Office " CN1197179A ", name are called " direct wind blowing type fluidizing furnace afterheat of slags reclaims novel method and system thereof " discloses a kind of air cooling slag that utilizes, and it is combustion-supporting to reclaim the method for afterheat of slags that the hot blast after will being heated by slag is sent into fluidizing furnace.Concrete technique means is: make from the slag inflow cooling of furnace slag bed of the ebullated bed discharging of fluidizing furnace, carry out heat exchange with the freezing air that blasts the cooling of furnace slag bed, its characteristics are the warm air after the slag heating is introduced stove from the suspension section of fluidizing furnace, as the required combustion air of fluidizing furnace secondary combustion.
The direct wind blowing type fluidizing furnace furnace slag waste heat recovery system that designs according to above-mentioned direct wind blowing type fluidizing furnace afterheat of slags recovery novel method combines with fluidizing furnace.Fluidizing furnace is comprised of ebullated bed, suspension section, air compartment, convection tubes, back-end surfaces and fan etc. usually, the principal feature of native system is to adopt multi-cell fluidized bed as the cooling of furnace slag bed, multi-cell fluidized bed comprises lathe bed, air distribution plate and multi-wind-chamber air inlet structure, have on the lathe bed into cinder notch, slag-drip opening and air outlet, its air distribution plate level or be obliquely installed, be no less than 3 chamber with baffle for separating one-tenth in the lathe bed on the air distribution plate, each bottom, chamber communicates, the same number of air compartment corresponding with the chamber in the lathe bed then arranged under the air distribution plate, is blast inlet under the air compartment.It enters cinder notch and links to each other with the overflow slag seepage flow mouth on ebullated bed top and the cold slag vent pipe of ebullated bed bottom respectively by the slag transport pipe, blast inlet is linked fan by the cold wind transport pipe, and air outlet is then linked the hot blast that is positioned at the fluidizing furnace suspension section by the hot blast conveying pipe road and entered fire door.Said hot blast enters the negative pressuren zone that fire door is positioned at the fluidizing furnace suspension section.
In recent years, along with modernization is industrial towards large-scale development, the scale of fluidizing furnace from ten thousand ton/years of 1-5 in one's early years, develops into ten thousand ton/years of 10-50 of today.Above-mentioned patented technology means are drawn stove with slag and are adopted air cooling can't adapt to the demand of present processing industry outward, in case slag flow, flow velocity increase, can't obtain the slag temperature that this article claims at slag notch and be reduced to 50 ℃ by 900 ℃.Even and if the requirement claimed by this article of its fluidizing velocity (1-3m/s), air quantity is implemented in practice, its tapping temperature also is difficult to reach 50 ℃.And adopt the mode in slag, return air shunting in this article, the return air that contains a large amount of ash directly enters upper furnace, can have a negative impact to integral body processing.
Summary of the invention
The present invention is directed to defects, provide a kind of production capacity large, recovery of heat usefulness is higher, and the return air that will not contain a large amount of ash is directly sent into the fluidization fluidizing reactor of upper furnace.
Technical scheme of the present invention is: described body of heater comprises lower air chamber, boiling bed, expanding reach, upper straight section and top cover from the bottom to top; Be provided with dispersion plate between described boiling bed and lower air chamber, be provided with slag notch at the side of described boiling bed, described slag notch lower edge height is higher than described dispersion plate plate face height; Outside body of heater, be provided with the slag overflow port, described slag notch and described slag overflow port by heat exchange type after the chamber ebullated bed link to each other;
The chamber ebullated bed comprises rear chamber ebullated bed body, plenum and heat exchanger behind the described heat exchange type;
Described rear chamber ebullated bed body comprises body, slag inlet and the slag-drip opening with hollow chamber;
Described plenum is located at the bottom of described body, to the chamber interior air blast of body;
Described heat exchanger comprises cooling tube bundle, and described cooling tube bundle stretches into the chamber interior of described body, fully contacts with the mobile slag of the chamber interior of described body;
Described slag-drip opening connects described slag overflow port;
Described slag inlet connects the slag notch of described boiling bed side; And described slag inlet doubles as the wind in the ebullated bed body of described rear chamber is inducted into air channel in the described boiling bed.
The inwall of described boiling bed is provided with cooling water tank, and described heat exchanger is connected with described cooling water tank.
Described slag inlet lower edge is provided with the slope at the end in the outer height, will be imported in the described boiling bed by the wind that rear chamber ebullated bed body bottom plenum bloats.
The height of described slag inlet lower edge is higher than the height of described slag-drip opening lower edge.
Be provided with the processing door in the outer face of described rear chamber ebullated bed body.
Described plenum comprises air compartment and blast cap, and described air compartment is fixedly connected on the bottom of described rear chamber ebullated bed body base plate, and described blast cap is fixedly connected on the base plate of described rear chamber ebullated bed body.
Described rear chamber ebullated bed body is made of inner steel lining insulating brick and heat-resisting mould material.
The intrinsic slag-drip opening of the described rear chamber ebullated bed outside is provided with deslagging chamber, and described deslagging chamber connects described slag overflow port.
The present invention with heat exchange type after the chamber ebullated bed link to each other with furnace body and form an integral body.The slag of body of heater boiling bed flows directly into behind the heat exchange type in the ebullated bed of chamber, and after the inflow, the cooling air of chamber ebullated bed acts on slag from bottom to top behind the heat exchange type, makes slag keep " boiling " state in cooling; And the slag of " boiling " can fully contact with the cooling tube bundle that is full of heat exchange medium and carry out heat exchange; Cooling air is heated in to the slag effect, and from the reverse infiltration furnace charge of slag notch (slag inlet of chamber ebullated bed behind the heat exchange type) of body of heater boiling bed, ash wherein can be absorbed by furnace charge, and can make burning more abundant through the cold wind of preheating.
Advantage of the present invention is: 1) air inlet of heat reclamation device directly enters stoving oven as secondary air before expanding reach, makes burning more abundant.2) slag obtains high Fe contained scum etc. through the secondary air fluidized bed roasting, has improved economic benefit.3) heat of slags of cooling tube bundle recovery produces middle pressure steam (3.82MPa, 256 ℃), improves heat utilization ratio.4) tapping temperature reduces (480-520 ℃) greatly, has alleviated the operating requirement of dreg removing system.5) compact construction, little, the simple installation of floor space, operational safety.
Description of drawings
Fig. 1 is structural representation of the present invention,
Fig. 2 is the structural representation of heat-energy recovering apparatus among the present invention,
Fig. 3 is A-A sectional view among Fig. 1,
Fig. 4 is the structural representation of cooling tube bundle in the heat-energy recovering apparatus of the present invention,
Fig. 5 is the vertical view of Fig. 4,
Fig. 6 is the structural representation of background technology of the present invention,
Fig. 7 is B-B sectional view among Fig. 6;
1 is the insulating brick liner among the figure, 2 is fireproof brick inner lining, 3 is lower air chamber, 4 is the air intlet pipe, 5 is dispersion plate, 6 is the dispersion plate blast cap, 7 is upper furnace, 8 are the boiling bed, the 81st, slag notch, 9 is cooling water tank, 10 is charging opening, 11 is the slag overflow port, 12 is furnace gas export, 13 is the secondary air import, 14 is lighting-up tuyere, 15 is the safety vent mouth, 16 is rear chamber ebullated bed body, the 161st, the slag inlet lower edge, 162 slag-drip opening lower edges, 17 is fire-resistant inwall, 18 is air compartment, 19 is inlet mouth, 20 is dispersion plate, 21 is blast cap, 22 is cooling tube bundle, 23 is deslagging chamber, 24 for processing door, the 25th, cleaning door.
Embodiment
The present invention is shown in Fig. 1-7, and described body of heater comprises lower air chamber 3, boiling bed 8, expanding reach (being upper furnace 7), upper straight section and top cover (establishing safety vent mouth 15 on the top cover) from the bottom to top; Be provided with dispersion plate 5 between described boiling bed 8 and lower air chamber 3, be provided with slag notch 81 at the side of described boiling bed 8, described slag notch lower edge height is higher than described dispersion plate 5 plate face height; Be provided with slag overflow port 11 outside body of heater, described slag notch 81 links to each other by chamber ebullated bed behind the heat exchange type with described slag overflow port 11;
The chamber ebullated bed comprises rear chamber ebullated bed body, plenum and heat exchanger behind the described heat exchange type;
Described rear chamber ebullated bed body comprises body 16, slag inlet and the slag-drip opening with hollow chamber;
Described plenum is located at the bottom of described body 16, to the chamber interior air blast of body 16;
Described heat exchanger comprises cooling tube bundle 22, and described cooling tube bundle 22 stretches into the chamber interior of described body 16, fully contacts with the mobile slag of the chamber interior of described body 16;
Described slag-drip opening connects described slag overflow port 11;
Described slag inlet connects the slag notch 81 of described boiling bed side; And described slag inlet 81 doubles as the wind in the ebullated bed body of described rear chamber is inducted into air channel in the described boiling bed 8.
The inwall of described boiling bed 8 is provided with cooling water tank 9, and described heat exchanger is connected with described cooling water tank 9 by described body of heater is outside.
Described slag inlet lower edge 161 is provided with the slope at the end in the outer height, will be imported in the described boiling bed 8 by the wind that rear chamber ebullated bed body 16 bottom plenums bloat.
The height of described slag inlet lower edge 161 is higher than the height of described slag-drip opening lower edge 162.Be beneficial to the discharge of slag.
Be provided with processing door 24 in the outer face of rear chamber ebullated bed body 16.Two sides are respectively equipped with cleaning door 25.Be convenient to ebullated bed body 16 inside, rear chamber are cleared up fully.
Described plenum comprises air compartment 18 and blast cap 21, and described air compartment 18 is fixedly connected on the bottom of described rear chamber ebullated bed body 16 base plates, and described blast cap 21 is fixedly connected on the base plate of described rear chamber ebullated bed body 16.
Described rear chamber ebullated bed body 16 is made of inner steel lining insulating brick and heat-resisting mould material.So that rear chamber ebullated bed body 16 has fire-resistant inwall 17.
The slag-drip opening place of described rear chamber ebullated bed body 16 is provided with deslagging chamber 23, and described deslagging chamber 23 connects described slag overflow port 11.
The present invention unites two into one warm sludge cooling, handling equipment and body of heater, has both reclaimed the warm sludge heat, has solved high temperature warm sludge conveying material rapid wear problem, has simplified technical process.At the device that the ebullated bed slag notch of conventional fluidizing reactor is provided with cooling of furnace slag, heat recuperation and slags tap, this device integral body of formation that links to each other with furnace body.Heat reclamation device comprises air compartment, gas distribution grid, refrigerating unit (being heat exchanger), dreg discharging box (chamber ebullated bed body 16 namely), the deslagging chamber of deslagging chamber and processes door etc.The warm sludge that fluidizing reactor is discharged carries out secondary boiling cooling in the ebullated bed body of rear chamber.Stokehold air that blower fan send enters by air compartment, enters stoving oven after grid distributor and warm sludge boiling bed heats up, and enters flue gas system as the secondary air of stoving oven, has indirectly reclaimed heat of slags.Carry out heat exchange by heat reclamation device cooling water tank and slag, control heat reclamation device bubbling bed temperature produces middle pressure steam about 510 ℃, improve heat utilization ratio.
Take the pyrite-based sulphuric acid plant of 200,000 ton/years of sulfur-bearings 35% as example, fluidizing reactor is per hour discharged the about 10t of slag, is down to 510 ℃ of calculating by slag from 900 ℃, and slag per hour shifts out heat as calculated:
Q slag=10 * 1000 * (0.956 * 900-0.918 * 510)=3922200KJ/h
Atmosphere temperature rising to 510 ℃ heat requirement: Q sky=4900 KJ/h
Heat-recoverable: Q=3922200-4900=3917300 KJ/h
Can produce 3.82MPa, 450 ℃ of middle pressure steam 1.21t/h, a year increase steam production is 9680t, saves the nearly 1100t of mark coal.
Slag temperature after heat exchange about 510 ℃ far below 900 ℃ of conventional slag temperatures, the cooling power of postorder residue extraction mechanism is required greatly to reduce, reduced equipment weld bond possibility of cracks.While is as the part of fluidizing furnace, ebullated bed body in chamber is by the Q345 Plate Welding behind the heat reclamation device, be followed successively by insulating brick, refractory castable etc. in the ebullated bed body of rear chamber, cancelled stainless steel warm sludge transfer lime and stainless steel water spray cooling apparatus, saved cost of manufacture, simple installation, safer in the operation.
Principle of work of the present invention is:
Air enters fluidizing furnace by air intlet pipe 4 and carries out roasting with the mineral aggregate that enters fluidizing reactor through charging opening 10 at boiling bed 8, enter the waste heat boiler recovery waste heat through the top roasting space 7 by furnace gas export 12, roasting, cooled warm sludge enter the slag heat-energy recovering apparatus from slag overflow port 11.Air from the inlet mouth 19 of slag heat-energy recovering apparatus carries out the secondary fluidized bed roasting at rear chamber ebullated bed (rear chamber ebullated bed body 16 inner chambers) to warm sludge, entering deslagging chamber 23 after simultaneously warm sludge and the cooling tube bundle 22 heat exchange cooling slags tap, this moment, slag temperature was about 510 ℃, and the warm air after the roasting enters fluidizing reactor as secondary air through slag notch 81.
Ebullated bed body in chamber adopts Q345 behind the fluidizing reactor of the present invention, rear chamber ebullated bed body liner insulating brick and refractory brick, and in order further to reclaim heat, the present invention reclaims the slag heat.

Claims (8)

1. fluidization fluidizing reactor, described body of heater comprise lower air chamber, boiling bed, expanding reach, upper straight section and top cover from the bottom to top; Be provided with dispersion plate between described boiling bed and lower air chamber, be provided with slag notch at the side of described boiling bed, described slag notch lower edge height is higher than described dispersion plate plate face height; Outside body of heater, be provided with the slag overflow port, it is characterized in that, described slag notch and described slag overflow port by heat exchange type after the chamber ebullated bed link to each other;
The chamber ebullated bed comprises rear chamber ebullated bed body, plenum and heat exchanger behind the described heat exchange type;
Described rear chamber ebullated bed body comprises body, slag inlet and the slag-drip opening with hollow chamber;
Described plenum is located at the bottom of described body, to the chamber interior air blast of body;
Described heat exchanger comprises cooling tube bundle, and described cooling tube bundle stretches into the chamber interior of described body, fully contacts with the mobile slag of the chamber interior of described body;
Described slag-drip opening connects described slag overflow port;
Described slag inlet connects the slag notch of described boiling bed side; And described slag inlet doubles as the wind in the ebullated bed body of described rear chamber is inducted into air channel in the described boiling bed.
2. a kind of fluidization fluidizing reactor according to claim 1 is characterized in that, the inwall of described boiling bed is provided with cooling water tank, and described heat exchanger is connected with described cooling water tank.
3. a kind of fluidization fluidizing reactor according to claim 1 is characterized in that, described slag inlet lower edge is provided with the slope at the end in the outer height, will be imported in the described boiling bed by the wind that rear chamber ebullated bed body bottom plenum bloats.
4. a kind of fluidization fluidizing reactor according to claim 1 is characterized in that, the height of described slag inlet lower edge is higher than the height of described slag-drip opening lower edge.
5. a kind of fluidization fluidizing reactor according to claim 1 is characterized in that, is provided with in the outer face of described rear chamber ebullated bed body to process door.
6. a kind of fluidization fluidizing reactor according to claim 1, it is characterized in that, described plenum comprises air compartment and blast cap, and described air compartment is fixedly connected on the bottom of described rear chamber ebullated bed body base plate, and described blast cap is fixedly connected on the base plate of described rear chamber ebullated bed body.
7. a kind of fluidization fluidizing reactor according to claim 1 is characterized in that, described rear chamber ebullated bed body is made of inner steel lining insulating brick and heat-resisting mould material.
8. arbitrary described a kind of fluidization fluidizing reactor is characterized in that according to claim 1-7, and the intrinsic slag-drip opening of the described rear chamber ebullated bed outside is provided with deslagging chamber, and described deslagging chamber connects described slag overflow port.
CN 201110350485 2011-11-09 2011-11-09 Fluidized boiling roasting furnace Active CN102382976B (en)

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Publication number Priority date Publication date Assignee Title
CN103759255A (en) * 2014-01-20 2014-04-30 苏州新区特氟龙塑料制品厂 Teflon fluidized bed furnace
CN106766906A (en) * 2016-11-30 2017-05-31 河池市技术开发中心 A kind of new concentrate fluidizing reactor furnace binding

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DE10115379C2 (en) * 2001-03-28 2003-07-17 Uhde Gmbh Process for the waste heat recovery of hot raw gases from a gasification plant operated with solid fuels and plant for carrying out the process
CN200955757Y (en) * 2006-09-10 2007-10-03 马应成 Furnace slag residual heat recovery device
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CN202329114U (en) * 2011-11-09 2012-07-11 建业庆松集团有限公司 Fluidization fluidizing reactor

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US4548162A (en) * 1984-10-22 1985-10-22 Combustion Engineering, Inc. Slagging heat recovery unit with potassium seed recovery
CN1197179A (en) * 1997-04-18 1998-10-28 中国科学院广州能源研究所 Directly-blowing bubbling furance slag after heat recovering method and system thereof
DE10115379C2 (en) * 2001-03-28 2003-07-17 Uhde Gmbh Process for the waste heat recovery of hot raw gases from a gasification plant operated with solid fuels and plant for carrying out the process
CN200955757Y (en) * 2006-09-10 2007-10-03 马应成 Furnace slag residual heat recovery device
KR20090036352A (en) * 2007-10-09 2009-04-14 재단법인 포항산업과학연구원 Apparatus for recycling heat of slag
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