CN2222880Y - horizontal fixed tube plate coal hot-air stove - Google Patents

Abstract

The utility model relates to a horizontal fixed tube plate coal hot-air stove, composed of a hearth, a heat exchanger, a fire door, a fire grate, a smoke box, a lower smoke chamber, an electromotor and a draught fan installed at a fume outlet. The horizontal fixed tube plate coal hot-air stove is characterized in that the hearth is arranged in a horizontal type, and refractory concrete is used to pour the hearth to form a cuboid shape; the heat exchanger is arranged in a vertical type, and the middle part of the heat exchanger is provided with a baffle plate; the middle part of the lower smoke chamber is provided with a lower smoke chamber baffle wall; the front and back arches are in a parabola shape, the front and back arches fulfill a radiation combustion-supporting function to the combustible materials in the hearth and the coal bed, thus the coal bed and the combustible materials can sufficiently burn, the smoke exhausting blackness is decreased, the air pollution is reduced, the volume of the stove body of 30% is reduced, the rolled steel of 25% is saved, and the cost is decreased.

Description

The horizontal coal-fired hot-blast stove of fixed tube sheet

The utility model relates to the horizontal coal-fired hot-blast stove of a kind of fixed tube sheet, and it is applicable to provides thermal source to dryings such as grain, food processing, agricultural byproducts.

The coal-fired hot-blast stove product of China's production at present mainly contains two big classes, and a class is a vertical hot furnace, and its design feature is that body of heater is circular, and heat-transfer surface is steel plate or steel plate fin combination form, and general design capacity is less, and heat-transfer surface is even; Shortcoming is: 1. flue gas and air channel flow process are shorter, and the smoke evacuation degree is higher, and the thermal efficiency is below 50%; 2. the radiation of burner hearth heating surface easily burns, the maintain and replace difficulty; 3. because high-temperature flue gas, the hot blast of hot-blast stove is only limited to two flow processs up and down, design bigger heating surface, the height dimension of this hot-blast stove is inevitable too high, so the capacity of vertical hot furnace is less, generally be no more than 800,000 kilocalories/hour.

Another kind of is horizontal, and its design feature is that body of heater is a rectangle, horizontal installation, and the coal-fired fire grate of tool machine, radiating surface is that steel pipe is horizontally disposed, and flue gas flow and hot blast flow process are single backhaul, and design capacity is bigger, and shortcoming is: 1. heat-transfer surface is heated inhomogeneous; 2. owing to adopting single backhaul, flue gas flows, its entrance velocity height, and heating surface wear is serious, and flow resistance is big simultaneously, and low in smoke outlet flow of flue gas speed, the easy dust stratification of heating surface causes the coefficient of heat transfer to descend greatly, and hot-blast stove can not normally be moved; 3. high temperature section velocity of flue gas height, exothermic coefficient is big, can cause the smoke pipe wall temperature to surpass permissible value and makes smoke pipe produce high temperature corrosion, reduces smoke pipe service life; 4. floor space is big, and setting height(from bottom) is big, thereby makes hot-blast stove capital construction one-time investment bigger.

The purpose of this utility model provides the horizontal coal-fired hot-blast stove of a kind of fixed tube sheet, the horizontal layout of its burner hearth, and heat exchanger is vertical layout, and heat exchanger is the two return structures of fixed tube sheet, and promptly flue gas and hot blast are two backhauls.

The horizontal coal-fired hot-blast stove of fixed tube sheet is by rectangle vertical heat exchanger 15, horizontal burner hearth 3, expansion chamber, smoke box 7, following smoke-box 4, following smoke-box partition wall 18, the air-introduced machine 12 and the motor 11 that are contained in exhanst gas outlet constitute, its design feature is that the heat-transfer surface of vertical heat exchanger 15 is welded to form by fixed tube sheet and steel pipe, the centre of heat exchanger is equipped with a deflection plate 5, be used to adjust the hot blast flow velocity, be provided with smoke-box 4 down in the bottom of heat exchanger, smoke-box partition wall 13 is used to adjust the flowing velocity of flue gas under smoke-box 4 is provided with down, in the Tube Sheet of Heat Exchanger is exhaust gases passes 8, pipe is outer to be hot-air channel 6, when flowing, high-temperature flue gas and heat exchange branch matter carries out exchange heat in passage, along with flue-gas temperature reduces gradually, volume-diminished, and heat exchange medium temperature raises gradually, volume expands gradually, in order to reach best heat exchange state, flue gas and heat transferring medium should keep stable flowing velocity, its flowing velocity is to control by the following Position Design of smoke-box partition wall 13 and deflection plate 5, and the size of its heat-transfer surface depends on that the radical of heat exchanger tube and heat exchanger tube length determines. the preceding chimney arch of burner hearth 3 and back chimney arch 2 adopt the parabolic type shapes, and the combustible in coal seam and the burner hearth is had the combustion-supporting effect of radiation, it is fully burnt, improve efficiency of combustion, reduce the fume emission blackness, alleviate atmosphere pollution.The furnace outlet place is provided with an expansion chamber, to reduce the dustiness of flue gas.

The utlity model has following advantage:

1. heat exchanger makes flue gas and heat transferring medium reach best eroding velocity owing to adopt mixed flowing mode, and the heat of heat-transfer surface effectively usage factor can reach 95%;

2. flue gas and heat transferring medium flow gently, do not take a sudden turn, and resistance is little, and therefore supporting use air-introduced machine motor power (output) is less;

3. adopt the fixed tube sheet horizontal type structure, hot blast body of heater volume can dwindle 30%, uses steel 25% less;

4. the furnace wall of burner hearth adopts the refractory concrete one-piece casting, can reduce the burner hearth air leakage coefficient, reduce heat loss, and the preceding chimney arch of burner hearth and back chimney arch adopt the parabolic type shape, combustible in coal seam and the burner hearth there is the combustion-supporting effect of radiation, makes abundant burning, improve the thermal efficiency, reduce the flue gas oke exhaust blackness, reduce atmosphere pollution;

5. the flow process of the sweep of gases speed of heat-transfer surface evenly flows, so heat exchanger tube inner surface dust stratification does not does not wear and tear, improves the service life of the thermal efficiency and heat exchanger.

Description of drawings:

Fig. 1 is the horizontal coal-fired hot-blast stove structural front view of fixed tube sheet;

Fig. 2 is an A-A system view among Fig. 1.

Mark among the figure: 1. coal feeding bucket is located at stokehold portion; 2. chimney arch; 3. burner hearth; 4. play smoke-box, be located at the burner hearth rear portion; 5. deflection plate is contained in the heat exchanger middle part and is used to control a two return hot blast flowing velocity; 6. the heat transferring medium direction that flows; 7. smoke box is contained in the top of heat exchanger 15; 8. high-temperature flue gas passage; 9. hot-blast outlet is located at heat exchanger top; 10. cold air inlet is located at the heat exchanger bottom; 11. motor; 12. air-introduced machine is contained in exhanst gas outlet 20 places; 13. following smoke-box partition wall; 14. chimney; 15. heat exchanger; 16. refractory concrete lining; 17. fire door; 18. insulation common brick wall; 19. fire grate; 20. exhanst gas outlet; 21. slag-drip opening.

Following structure accompanying drawing is described further architectural feature of the present utility model:

The horizontal coal-fired hot-blast stove of fixed tube sheet as shown in Figure 1 and Figure 2, by burner hearth 3, heat exchanger 15, fire door 17, fire grate 19, following smoke-box 4, exhanst gas outlet 20, and the air-introduced machine 12, the motor 11 that are installed on the exhanst gas outlet 20 constitute, it is characterized in that burner hearth 3 is horizontal layout, build into rectangular-shaped with fire-resistant mixed soil with refractory brick, heat exchanger 15 is vertical layout, this heat exchanger is welded by tube sheet and heat exchanger tube, deflection plate 5 is housed at the middle part of heat exchanger 15 is used to control a two return hot blast flowing velocity; Smoke-box partition wall 13 under the centre of smoke-box 4 is provided with down is used to control a two return high-temperature flue gas flowing velocity; The preceding chimney arch of burner hearth 3 and back chimney arch 2 adopt the parabolic type shape, and the combustible in coal seam and the burner hearth is had the combustion-supporting effect of radiation, make abundant burning, improve the thermal efficiency, reduce the discharging blackness of flue gas, alleviate atmosphere pollution; The chimney arch of burner hearth refractory concrete one-piece casting can increase the service life, and build the outside insulation common brick wall 18.

Claims (4)

1. horizontal combustion heat wind furnace of fixed tube sheet, (misfortune, heat exchanger (15), fire door (17), fire grate (19), smoke box (7), smoke-box (4), exhanst gas outlet (20) and the air-introduced machine (12), the motor (11) that are installed in exhanst gas outlet constitute and it is characterized in that burner hearth (3) is horizontal layout down by burner hearth, build into rectangular-shaped with refractory concrete and refractory brick, heat exchanger (15) is vertical layout, this heat exchanger is welded by tube sheet and heat exchanger tube, is provided with smoke-box (4) down at the rear portion of burner hearth.

2. according to the described coal-fired hot-blast stove of claim 1, it is characterized in that deflection plate (5) being housed at the middle part of heat exchanger (15).

3. according to the described coal-fired hot-blast stove of claim 1, it is characterized in that smoke-box partition wall (13) under the centre of smoke-box (4) is provided with down.

4. according to the described coal-fired hot-blast stove of claim 1, it is characterized in that the preceding chimney arch of burner hearth and back chimney arch (2) adopt the parabolic type shape.

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