CN203375689U - A novel efficient hot air furnace - Google Patents

Abstract

The utility model provides a novel efficient hot air furnace and belongs to the field of combustion technology. The novel efficient hot air furnace comprises a deashing door, a front shaft assembly, a chain grate, a hopper, a material feeding and conveying device, secondary air inlets, a hot air outlet, a combustion shield, a primary air supply opening, an ash discharging and conveying device, an ash collecting hopper, a primary air adjusting device, a furnace top, a combustion chamber and a hot smoke mixing chamber. The material feeding and conveying device, the hopper and the chain grate form a material supply device; the chain grate is disposed under a furnace body; the combustion shield, the chain grate and the furnace top define the combustion chamber; the furnace top and the secondary air inlets define the hot smoke mixing chamber which is isolated from the combustion chamber through the combustion shield; and two stages of air inlets are disposed in the combustion chamber and the hot smoke mixing chamber so that the stability of high temperature of the combustion chamber and the uniformity of temperature of the high smoke mixing chamber are guaranteed. By means of staged air distribution and addition of the combustion shield, the energy is concentrated, high-temperature combustion of coal is achieved, the combustion efficiency and heat efficiency are increased and the objective of obtaining both economic benefit and environmental benefit is achieved.

Description

A kind of Efficien hot-blast stove

Technical field:

The utility model belongs to field of combustion technology, particularly the device of coal-fired hot-blast stove.

Background technology:

Hot-blast stove is to work the key equipment of drying the furnace charge effect for generating slag micropowder and clinker.For the fuel of hot-blast stove, coal resources in China is than natural gas and blast furnace gas, coke-stove gas and heavy oil, and diesel oil etc. will enrich manyly, so China's hot-blast stove fuel is to take fire coal as main.Current general combustion technology is by coal cinder process coal mill system grind into powder, then sprays in combustion furnace and is mended the wind burning.But, owing in slag micropowder or clinker generation system, being furnished with high-power air-introduced machine, slag micropowder and hot blast are introduced into Vertical Mill and Bag filter system by the draft effect of air-introduced machine.Because negative pressure is excessive, can cause in pulverized coal hot air furnace that to be suspended in airborne coal dust firing effect poor. the breeze airflow excessive velocities, wash away furnace roof and a large amount of coal dust and go to the warm-air pipe internal combustion. must have a large amount of imperfect combustion phenomenons and produce and the burner hearth coking, to such an extent as to the warm-air pipe coking; And can only use the higher coal of calorific value that price is more expensive; During burning, coal cinder need to be ground to form to coal dust, dust is larger; Hot-blast stove is the air flow bed combustion technology, and ignition trigger is difficulty relatively, needs diesel oil just can light coal dust by burner atomization combustion preheater burner hearth to uniform temperature, and cost is higher, contaminated environment; Because air distribution needs, a plurality of fire doors are opened in the body of heater both sides, make cold wind directly enter burner hearth, join cold wind and can cause the high low temperature skewness of burner hearth when more, and mean temperature is low, and coal dust can not fully burn, and coking and slagging scorification phenomenon easily occur, and hot-blast stove efficiency is low; Join the less flue gas temperature of hearth outlet that can cause again of cold wind high, in smoke pipe, refractory brick will be set, insulation is had relatively high expectations; On-the-spot ash and the poor working environment of leaking.So improve to optimize existing Combustion of Hot Air Furnace equipment to the efficiency of combustion of raising coal and then create enterprise efficiency positive effect arranged.

Summary of the invention:

In order to overcome the problem of at present above-mentioned coal-fired hot-blast stove, the utility model adopts the excess enthalpy combustion technology, change existing hot blast stove system, design a kind of Efficien hot-blast stove, to improving efficiency of combustion and the thermal efficiency of coal, solve on-the-spot ash and the poor working environment problem of leaking, reduce coal burning pretreatment cost, effectively improve through a Ji and environmental benefit.

A kind of Efficien hot-blast stove of the utility model, this hot-blast stove mainly comprises shoot door, front axle assembly, traveling-grate stoker, hopper, pan feeding conveyer, secondary air inlet, hot-blast outlet, burning cover, air outlet, goes out the lime-ash conveyer, flue-dust retainer, alumina firebrick, insulation material, insulating brick, common brick, wind adjusting device, furnace roof, combustion chamber, hot flue gas mixing-chamber, and pan feeding conveyer, hopper, traveling-grate stoker have formed feeding device; Pan feeding conveyer, hopper are installed on stokehold, and traveling-grate stoker is arranged on the body of heater below; Burning cover, traveling-grate stoker, furnace roof surround combustion chamber; It is characterized in that hot flue gas mixing-chamber and combustion chamber that furnace roof, secondary air inlet form isolate by the burning cover be installed in stove.

Feature of the present utility model also is:

The chain fire-gate distance of burning cover and furnace bottom is below 150cm, and burning cover adopts the exotic material manufacture, and material is the complex phase rare earth pottery.

The beneficial effects of the utility model are:

1) adopt traveling-grate stoker not only to save the pretreating process that former hot blast stove system is ground coal cinder, and light coal dust without diesel oil by burner atomization combustion preheater burner hearth to uniform temperature, reduce cost, solved corresponding problem of environmental pollution.

2) air distribution at twice: one time wind is introduced burning cover, for coal completing combustion; Secondary Air is introduced stove top, mixes high-temperature flue gas.Both guarantee the high temperature in combustion chamber, for inferior fuel provides the smooth combustion environment, avoided other regional high temperature impacts in stove simultaneously, extended the service life of hot-blast stove, reduced the insulation requirement of flue.

3) high-temp combustion can improve reaction speed, expands the smooth combustion scope, increases the stability of burning, for low heat value or low concentration fuel combustion, has certain applicability; Can use inferior fuel, comprise low-calorie colm, living beings etc., to the size of fuel without harsh requirement.

4) store a large amount of fuel in burner hearth, sufficient heat storage capacity has been arranged, guaranteed combustion stability; Carry out effective banking fire during blowing out, stove restarts convenient, fast and economical.

The accompanying drawing explanation:

Fig. 1 is a kind of Efficien hot-blast stove positive view of the utility model.

Fig. 2 is the left cutaway view of a kind of Efficien hot-blast stove of the utility model.

In above-mentioned accompanying drawing: 1 is shoot door, and 2 is front axle assembly, and 3 is traveling-grate stoker, and 4 is hopper, 5 is the pan feeding conveyer, and 6 is secondary air inlet, and 7 is hot-blast outlet, and 8 is burning cover, 9 is an air outlet, and 10 for going out the lime-ash conveyer, and 11 is flue-dust retainer, 12 is alumina firebrick, and 13 is insulation material, and 14 is insulating brick, 15 is common brick, and 16 is a wind adjusting device, and 17 is furnace roof, 18 is combustion chamber, and 19 is hot flue gas mixing-chamber, and 20 is the fume emission mouth.

The specific embodiment:

Further illustrate the specific embodiment of a kind of Efficien hot-blast stove of the utility model below in conjunction with accompanying drawing.

The structure of a kind of Efficien hot-blast stove of the utility model as shown in Figure 1, mainly comprise hopper 4, traveling-grate stoker 3, air inlet 9, burning cover 8, hot-blast outlet 7, flue-dust retainer 11, furnace roof 17, pan feeding conveyer 5, hopper 4, traveling-grate stoker 3 form feeding device, and traveling-grate stoker 3 is arranged on the body of heater below; One time air inlet 9 is arranged on traveling-grate stoker 3 belows, with secondary air inlet 6, forms blowing system; The combustion chamber 18 that burning cover 8, traveling-grate stoker 3, furnace roof 17 surround; Alumina firebrick 12, insulation material 13, heat-resisting version 14, common brick 15 form furnace roof 17; Burning cover 8 is 90～110cm with the distance of furnace bottom traveling-grate stoker 3.Burning cover 8 adopts the exotic material manufacture, and material can be selected silicon nitride, carborundum, zirconia and aluminium oxide; Furnace roof 17, secondary air inlet 6 form hot flue gas mixing-chamber 19 isolates by burning cover 8 with combustion chamber 18.Hot flue gas mixing-chamber 19 tops have hot-blast outlet 7; The flue-dust retainer 11 that is arranged on traveling-grate stoker 3 one sides with go out lime-ash conveyer 10 and form and ash-slag disposal system.

Coal fuel is packed into by pan feeding conveyer 5 in hopper 4, by traveling-grate stoker 3, is delivered to combustion chamber 18; The combustion air that blower fan is carried enters combustion chamber 18 by blast pipe by an air inlet; Coal fuel is in traveling-grate stoker 3 and air mixed combustion, and the lime-ash after coal burning is delivered to tail end by traveling-grate stoker 3, falls into flue-dust retainer 11, then by going out lime-ash conveyer 10, sends outside stove; The high-temperature flue gas generated enters hot flue gas mixing-chamber 19 through burning cover 8, is mixed into the uniform hot flue gas of temperature with the air passed into by secondary air inlet 6 and discharges hot-blast stove by hot-blast outlet 7.The high accumulation of heat of burning cover 8 and the capacity of heat transmission make temperature in combustion chamber 18 evenly and, more than can reaching 1000 degree, form the high-temp combustion of coal, can make colm fully burn.The fume emission outlet 20 that diameter is about the 100mm left and right is left at top, and for exhaust use in the situations such as igniting, the anxious stopping time banking of production, a small amount of flue gas produced while avoiding igniting or banking enters vertical mill system, during the hot-blast stove normal operation, closes.

During igniting, only need be at the coal of the anterior paving of fire grate 20～30 millimeters thick, the fire-lighters such as coal upper berth firewood, waste paper, old continuous yarn.Light fire-lighter, slow travel(l)ing grate, deliver to fire apart from after 1～1.5 meter, coal flashboard, stopping fire grate and rotate.In stove, temperature is elevated in the time of lighting new coal gradually, adjusts the coal seam flashboard, and keeping coal seam thickness is 70～100 millimeters, and slowly travel(l)ing grate, and adjusting air blast, accelerate burning.The hot-blast stove wall adopts whole adiabatic heat-insulation design, makes the furnace wall hull-skin temperature closely for normal temperature, has avoided the wall heat loss, and the grey phenomenon that simultaneously prevents from leaking out occurs, and has improved the operating environment of hot-blast stove.The design of employing air zoning, both guaranteed the high temperature in combustion chamber, for fuel combustion provides the smooth combustion environment, avoids other regional high temperature impacts in stove simultaneously, extends the service life of hot-blast stove.Designed combustion cover and secondary air distribution have been realized the high-temp combustion of coal, not only possess efficiency of combustion high, and temperature field in furnace is evenly distributed, thermal efficiency advantages of higher, and to the particle diameter of fuel coal without specific (special) requirements.High-temp combustion can improve reaction speed, expands the smooth combustion scope, increases the stability of burning, for low heat value or low concentration fuel combustion, has certain applicability; Therefore can use inferior fuel, comprise low-calorie colm, living beings etc., to the size of fuel without harsh requirement, and igniting, restarting are easy, the hot-blast stove integrated model is without the ash that leaks out, and environment is good, reaches the two purposes of receiving of economy and environment benefit.

Claims (4)

1. an Efficien hot-blast stove, this hot-blast stove mainly comprises shoot door (1), front axle assembly (2), traveling-grate stoker (3), hopper (4), pan feeding conveyer (5), secondary air inlet (6), hot-blast outlet (7), burning cover (8), an air outlet (9), go out lime-ash conveyer (10), flue-dust retainer (11), alumina firebrick (12), insulation material (13), insulating brick (14), common brick (15), a wind adjusting device (16), furnace roof (17), combustion chamber (18), hot flue gas mixing-chamber (19), pan feeding conveyer (5), hopper (4), traveling-grate stoker (3) has formed feeding device, pan feeding conveyer (5), hopper (4) are installed on stokehold, and traveling-grate stoker (3) is arranged on the body of heater below, burning cover (8), traveling-grate stoker (3), furnace roof (17) surround combustion chamber (18), it is characterized in that hot flue gas mixing-chamber (19) and combustion chamber (18) that furnace roof (17), secondary air inlet (6) form isolate by the burning cover (8) be installed in stove.

2. a kind of Efficien hot-blast stove as claimed in claim 1, be characterised in that burning cover (8) and the distance of furnace bottom traveling-grate stoker (3) are below 150cm.

3. a kind of Efficien hot-blast stove as claimed in claim 1, be characterised in that burning cover (8) adopts the exotic material manufacture, and material is the complex phase rare earth pottery.

4. a kind of Efficien hot-blast stove as claimed in claim 1, be characterised in that hot flue gas mixing-chamber (19) top leaves fume emission outlet (20), and diameter is about 100mm.

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