CN2465047Y

CN2465047Y - Mechanical coal combustion hot blast furnace

Info

Publication number: CN2465047Y
Application number: CN00265543U
Authority: CN
Inventors: 高泰荫
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-28
Filing date: 2000-12-28
Publication date: 2001-12-12
Anticipated expiration: 2010-12-28

Abstract

The utility model relates to a mechanical coal combustion hot blast furnace which is composed of a combustion fan, a fire grate, a combustor, an exchanger, a preheater, an air feeder, a deduster, a smoke guiding machine and a chimney, wherein the combustion apparatus of coal is composed of the combustion fan, the fire grate and the combustor, the fire grate is a reciprocating mechanical type exchanger tilted in a small angle and using a radiation-convection, air pipe-smoke pipe unitized exchanger. Unit devices are hermetically connected by a metal pipeline, and the whole mechanical coal combustion hot blast furnace is controlled by a gauge board. The utility model is suitable to produce hot blast with high power, the rated range is from 1.2 MW to 1.5 MW, the overall thermal efficiency reaches above 75%, the stack gas temperature is low, and the mechanical coal combustion hot blast furnace is fit for environment protecting requirements. The utility model has the advantages of compact structure, reliable operation, easy operation, etc.

Description

The machinery coal-fired hot-blast stove

The utility model belongs to Thermal Power Engineering and dry field of engineering technology, particularly a kind of mechanical coal-fired hot-blast stove that produces hot blast.

Working medium and thermal source that hot blast is handled as dry materials are applied to wide industrial department (as the energy, chemical industry, metallurgy, building materials, machinery, electronics, light industry, medicine and environment etc.) and many people's livelihood fields (as agriculture and animal husbandry farm and food etc.).Because China is based on the fuel mix characteristics of fire coal and the heat transfer parameter characteristic of heated air working medium, existing hot-blast stove is difficult to realize the optimization of combination properties such as high-power, high-effect, low pollution, long-life.Existing procucts ubiquity or fuel availability are not high, or structure is unreasonable, or the problem of service life of equipment deficiency.

The purpose of this utility model is to provide a kind of high-power air heating furnace with stoker fired grate fire coal of high-effect, as to hang down pollution, long-life, combination property optimization adaptation China fuel mix characteristics.

The utility model has combustion fan, fire grate, combustion chamber, heat exchanger, preheater, pressure fan, deduster, smoke suction machine and chimney to constitute.Be main equipment wherein with combustion fan, fire grate, combustion chamber and heat exchanger.Combustion fan, fire grate and combustion chamber constitute the burning of coal device.Combustion fan is by coal-fired air quantity and the required type selecting of secondary air flow, the blower fan outlet connects the passage of a wind and supplies the bypass line of secondary wind, a wind is sent to the fire grate bottom and uses for coal-fired, supply secondary wind with the coal smoke that burnouts, and adjusting flue gas heat source temperature, the butterfly control valve is set on the air pipe line, and fire grate is a small angle inclination reciprocating machine formula, and wheel is housed on the fire grate botton plate; The combustion chamber has two ends to depress, the furnace roof curve shape of intermediate projections, guarantee the clean-burning proportional space of coal, the termination is provided with leads burner, body of heater side wall and top form with refractory material internal layer and outer compound the building by laying bricks or stones of heat-barrier material, square beam is formed by common refractory concrete ramming on the coal-in port, the indoor beam that overdoes that separates lime-ash and thermal source flue gas that is provided with, lead the flame beam by the high temperature resisting refractory concrete ramming, bury water cooling tube underground in the beam that overdoes of Large Furnace, water flowing cooling during work, the ash bed thickness in the reference by location coal afterburnt of the beam that overdoes determines that profile helps hot flow of flue gas.The furnace wall both sides of combustion furnace are established actuating doors and are spied on door, and furnace roof is provided with survey hole of thermocouple, and stove integral body is fixed by peripheral steel construction.The stokehold is provided with the automatic stoking device, and the combustion furnace burner is connected with expansion chamber, and expansion chamber is built liner by laying bricks or stones with common refractory, and skin has heat-insulating material.The stove tail is provided with water seal ash pit, and crawler type ash disposal machinery is arranged in the grey pit.Expansion chamber steel construction and furnace binding join, and constitute integral form, and the heat exchanger load-bearing is in the expansion chamber steel construction, and its opening docks with the expansion chamber open top.The expansion chamber top is by the refractory concrete ramming, and reservation and the corresponding circular open of exchanger heat smoke inlet, and envelope is filled out by refractory material in its gap, not with exterior.Heat exchanger adopts radiation-convection current, air hose-smoke pipe combination high-efficiency heat exchanger, and preheater is set before heat exchanger, and preheater is a sleeve tubulation combined type.Be to guarantee hot-blast stove air working medium in service and the rational flow parameter of flue gas medium, the confidential correct type selecting of pressure fan, smoke suction machine and combustion air that the utility model adopts, and make parameter matching between them.The work air quantity of pressure fan and blast are determined the parameter request of hot air source according to drying device, guarantee the air flow circuit operation under positive pressure to the outlet of heat exchanger hot blast from the pressure fan air feed thus, and heat exchanger hot blast outlet temperature and pressure satisfy the drying process requirement.Smoke suction machine is pressed Coal-fired capacity, heat exchange amount type selecting, makes the operation of flue gas stream negative pressure, and guarantees that eutral margin is in the grate surface position.Deduster is set before smoke suction machine, and deduster is that earthenware is centrifugal, its type selecting and smoke evacuation capabilities match.Chimney is the iron sheet chimney, highly satisfies environmental requirement.From heat exchanger between the chimney single devices with the airtight connection of metal tubes, cause the flue gas stream to be negative pressure by the gravitation of smoke suction machine and flow, butterfly valve is set on the flue gas stream before smoke suction machine regulates exhaust smoke level and keep grate surface to be the zero-pressure level.Be connected so that metal tubes is airtight between air feed machine outlet and the heat exchanger entrance.Complete machine is controlled by instrument board.

Further narrate content of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the configuration of the utility model each several part,

Fig. 2 is the utility model main equipment structural representation.

Among the figure: 1 combustion fan, 2 fire grates, 3 combustion chambers, 4 heat exchangers, 5 preheaters, 6 pressure fans, 7 dedusters, 8 smoke suction machines, 9 chimneys, 10 deslagging devices, 11 coal supply apparatus, 12 expansion chambers.

Use the utility model, thermal source is provided by fire coal.Coal infeeds in the combustion furnace by quantitative automatic coaling facilities continuously, on the reciprocating machine fire grate, burn, combustion air is infeeded from fire grate bottom segmentation by blower fan 1, coal is burnouted in the fire grate primary zone, air quantity is regulated by the butterfly valve that is arranged on the pipeline, guarantee air coefficient n＜1.5, the hot combustion gas of generation enters the depositing dust space by the burner of leading of termination, combustion chamber.Secondary wind inlet is set entering before leading burner, communicates, infeed secondary wind, regulate secondary air flow,, and adjust the hot flue-gas temperature that enters before the heat exchanger with the carbon black in the hot flue gas of after-flame by the butterfly valve that is provided with on the bye-pass with the bye-pass of blower fan 1.Hot flue gas self-conductance burner leaves the combustion chamber and enters surge chamber, with depositing dust and make the hot flue gas distributions that enters heat exchanger even.Hot flue gas adds hot-air in heat exchanger, make it to reach the temperature of technological requirement.After hot flue gas cool-down leaves heat exchanger, enter preheater,, leave the flue-gas temperature of preheater and reduce to below 120 ℃, after earthenware deduster 7 and smoke suction machine 8 are sent into chimney 9 to utilize fume afterheat more fully.The thermal source flue gas that coal combustion produces in the combustion chamber, gravitation by smoke suction machine causes mobile, spontaneous combustion chamber-surge chamber-heat exchanger-preheater-deduster-smoke suction machine-chimney-emptying, connect with metal tubes between the equipment behind the heat exchanger, regulate flow by the butterfly valve that is provided with before the smoke suction machine, flue gas is negative pressure and flows, and the maintenance grate surface is a zero-pressure.The production of hot-air is finished in heat exchanger.The normal temperature air of being supplied with by air feed machine 6 enters heat exchanger 4 through preheater 5, behind hot flue gas heat exchange, is met the working media of process conditions temperature, pressure requirement.Startup of the present utility model and protection thereof, Coal-fired capacity, combustion air volume and secondary air flow are regulated by button control on the instrument board, furnace temperature, enter that cigarette temperature and hot blast temperature all can obtain showing before the heat exchanger on instrument board.

The utility model is suitable for high-power production hot blast, rated range 1.2～10.5mw, and overall thermal efficiency reaches more than 75%, and exhaust gas temperature is low, smoke evacuation lingemann blackness level＜1 (fume amount＜0.20g/m ³), compliance with environmental protection requirements.Have compact conformation, take up an area of advantages such as few, reliable, easy to operate.

Claims

1. mechanical coal-fired hot-blast stove, by combustion fan, fire grate, the combustion chamber, heat exchanger, preheater, pressure fan, deduster, smoke suction machine and chimney constitute, it is characterized in that by combustion fan, the burning of coal device is formed in fire grate and combustion chamber, the combustion fan outlet connects the passage of a wind and supplies the bypass line of secondary wind, the butterfly control valve is set on the air pipe line, fire grate is a small angle inclination reciprocating machine formula, wheel is housed on the fire grate botton plate, burner ends is depressed, the intermediate projections termination is provided with leads burner, the indoor beam that overdoes that separates lime-ash and thermal source flue gas that is provided with, the furnace wall both sides of combustion furnace are established actuating doors and are spied on door, furnace roof is provided with survey hole of thermocouple, stove integral body is fixed by peripheral steel construction, the stokehold is provided with the automatic stoking device, combustion furnace is connected with expansion chamber for big mouthful, the stove tail is provided with water seal ash pit, in the ash pit crawler type ash disposal machinery is arranged, expansion chamber steel construction and furnace binding join, the heat exchanger load-bearing is in the expansion chamber steel construction, its opening docks with the expansion chamber open top, heat exchanger adopts radiation-convection current, air hose-smoke pipe unitized exchanger, preheater is set before heat exchanger, preheater is a sleeve tubulation combined type, select suitable pressure fan, smoke suction machine and combustion fan, make the parameter matching between them, deduster is set before the smoke suction machine, and chimney is the iron sheet chimney, from heat exchanger between the chimney single devices with the airtight connection of metal tubes, be connected so that the metal road is airtight between air feed machine outlet and the heat exchanger entrance, complete machine is controlled by instrument board.

2. mechanical coal-fired hot-blast stove according to claim 1 is characterized in that said combustion chamber stove side wall and top form with refractory material internal layer and outer compound the building by laying bricks or stones of heat-barrier material.

3. mechanical coal-fired hot-blast stove according to claim 1 and 2 is characterized in that the beam that overdoes established in the said combustion chamber when hot-blast stove is Large Furnace, burying water cooling tube in the beam that overdoes.

4. mechanical coal-fired hot-blast stove according to claim 1 is characterized in that the expansion chamber that said and combustion furnace burner join is liner with the common refractory, and skin has heat-insulating material to build by laying bricks or stones to form.