CN2453328Y - Horizontal tubular type coal hot-blast furnace - Google Patents

Abstract

The utility model relates to a horizontal tubular type coal hot-blast furnace, which is suitable for offering hot sources for drying grain crops, such as corn, wheat, etc. The utility model comprises an insulated furnace wall, a perlite insulated layer, a grate, a partition wall, a sedimentation chamber, a cleanout door, a fire pulling door, an ash cleaning door, a coal hopper, heat exchangers, a smoke outlet pipeline, a blower fan, an electric motor, and a chimney. Three return travels for smoke and single return travel for hot gas are composed of three heat exchangers and three smoke boxes, and thereby, heat exchanger efficiency is enhanced, the designed capacity is enlarged which can reach 25000 MJ/H in a widest range. The heat exchangers are horizontally installed and conducted, so the ash in the pipe can be accumulated and blocked, the cleaning is easy, and meanwhile, the service life of the heat exchangers can be enhanced, and the cost is low.

Description

Horizontal tubular coal-fired hot blast stove

The invention relates to the improvement of a tube-and-tube coal-fired hot blast stove, especially a horizontal tube-and-tube coal-fired hot-blast stove.

At present, there are two main types of shell-and-tube coal-fired hot blast stoves in use, one is the upper and lower structure, the tubes are installed horizontally on the top, and the combustion chamber is on the bottom. The flue gas flow is a single return, and the heating medium flow is a double return. Its disadvantages are: the heat exchange surface is heated unevenly, because the flue gas adopts a single return flow, the speed of the flue gas entering the entrance of the heat exchanger is high, the heating surface is severely worn, and the flow resistance is large at the same time, and the flow speed of the flue gas at the flue gas outlet Low, the heating surface is easy to accumulate dust, resulting in a decrease in the heat transfer coefficient; the high-temperature section has a high flue gas velocity and a large heat release coefficient, which will cause the wall temperature of the smoke tube to exceed the allowable value, resulting in high-temperature corrosion of the smoke tube and reducing the service life of the smoke tube ;Due to the large installation height of the upper and lower structure of the furnace body; the design capacity is limited to no more than 15000MJ/H; the other type is a vertical tube-type coal-fired hot blast stove, the heat exchanger is a vertical tube-type heat exchanger, and the flue gas three-pass hot air single-pass structure The disadvantage is that the temperature of the furnace is adjusted by the air leakage of the furnace, which increases the air leakage coefficient of the furnace and reduces the thermal efficiency; because the heat exchanger is arranged vertically and there is a pit at the bottom of the heat exchanger, there is heat loss; , It is easy to appear in the third group of heat exchangers to produce annual low-temperature condensation, slowly accumulate water, be stained with dust, until the pipe head is blocked, affecting the flow of flue gas. Decrease the output of the hot blast stove.

The purpose of the invention is: to make the heat exchange surface evenly heated, the smoke pipe does not stick to dust, does not block the pipe, improves the heat transfer coefficient, improves the thermal efficiency, prolongs the service life of the heat exchanger, reduces the cost, increases the design capacity, and provides a The utility model relates to a horizontal shell and tube coal-fired hot blast stove.

The present invention is realized through the following technical solutions: horizontal tube-type coal-fired hot blast stove, including insulation furnace wall, perlite insulation layer, furnace arch, furnace hearth, fire grate, partition wall, settling chamber, slag discharge door, It is composed of fire door, dust cleaning door, coal hopper, heat exchanger, flue gas outlet pipe, fan, motor and chimney. It is characterized in that the heat exchanger is divided into three groups, namely heat exchanger Ⅰ, heat exchanger Ⅱ, heat exchanger The heat exchanger III is installed horizontally at the rear of the settling chamber. One end of the heat exchanger I is connected to the settling chamber, and the other end is connected to the smoke box I. One end of the heat exchanger II is connected to the smoke box I, and the other end is connected to the smoke box II. One end of device III is connected to smoke box II, the other end is connected to smoke box III, smoke box III is connected to flue gas outlet pipe, flue gas outlet pipe is connected to fan, fan is connected to chimney, and hot air is installed outside the furnace of heat exchanger I. Outlet pipes, cold air inlet pipes are installed outside the furnace body of heat exchanger III.

The working process of the horizontal tubular coal-fired hot blast stove is: the coal is burned in the furnace, the flue gas enters the heat exchanger Ⅰ under the suction and guidance of the fan, and enters the smoke box Ⅰ through the other end of the heat exchanger Ⅰ, and the flue gas enters the smoke box Ⅰ in the flue gas. The gas box I enters the heat exchanger II, enters the smoke box II through the other end of the heat exchanger II, and the flue gas enters the heat exchanger III from the smoke box II, enters the smoke box III through the heat exchanger III, and enters the smoke box III The flue gas outlet pipe is sent into the chimney by the fan to be discharged, and the cold air enters from the cold air inlet pipe, and flows out from the hot air outlet pipe after being heated by heat exchanger III, heat exchanger II, and heat exchanger I.

The advantages created by the invention are: due to the use of three sets of tube-and-tube heat exchangers arranged vertically and horizontally and three smoke boxes, the three-pass flue gas can be realized, and the heat can be flushed and released in the longitudinal direction; decrease, still ensure that the flow rate of the flue gas remains within a relatively stable range when the volume decreases after heat release, and the heat-absorbing medium conducts lateral flushing outside the heat exchanger to absorb heat, the temperature gradually increases, and the volume gradually expands, so that the heat-absorbing medium During the heat absorption process, increase the flow velocity and increase the heat transfer coefficient of the heat exchange surface; since the flue gas flows horizontally in the heat exchanger, the speed is stable, and there is no water or dust at the outlet of the heat exchanger III, and there will be no Blockage occurs, prolonging the cleaning cycle and service life of the heat exchanger; due to the horizontal arrangement of the heat exchanger, the flow of flue gas and heat-absorbing medium is stable, there is no sharp turn, and the resistance is small, so the power of the matching motor can be reduced; due to the use of three A set of horizontal shell and tube heat exchangers improves the design capacity of the hot blast stove.

The present invention is described in detail below in conjunction with accompanying drawing and embodiment:

Figure 1 is a front view of the structure of a horizontal tubular coal-fired hot blast stove, and the arrows in the figure indicate the direction of flue gas flow.

Fig. 2 is a top view of the structure of the horizontal tube-type coal-fired hot blast stove.

The arrow outside the cold air inlet pipe in the figure indicates the direction of cold air circulation. Arrows in the smoke box II indicate the direction of flue gas flow.

Horizontal tubular coal-fired hot blast stove, the outermost is the heat preservation furnace wall 1, and the furnace arch 3 poured with refractory concrete is used in the heat preservation furnace wall 1 to form the furnace 6, and perlite is added between the heat preservation furnace wall 1 and the furnace arch 3 Insulation layer 2, the furnace body is equipped with fire-drawing door 8, ash-cleaning door 9, slag-discharging door 7, fire grate 10 and coal hopper 11, and the front and rear arches of the furnace 6 are in the shape of a parabola, which has a radiation-combustion-supporting effect on the combustibles. To improve the thermal efficiency of combustion, set a partition wall 5 at the rear of the furnace 6 to form a settling chamber 4, install a heat exchanger I14 at the rear of the settling chamber 4, install a smoke box I15 at the outlet of the heat exchanger I14, and install the smoke box I15 with the heat exchanger The heat exchanger Ⅱ24 is connected, the flue gas flows according to the flue gas flow direction 16, the smoke box Ⅱ25 is installed at the other end of the heat exchanger Ⅱ24, the smoke box Ⅱ25 is connected with the heat exchanger Ⅲ23, the flue gas flows according to the arrow in the smoke box Ⅱ, heat exchange The other end of the device Ⅲ23 is connected to the smoke box Ⅲ21, and the three heat exchangers are all installed horizontally. The smoke enters the smoke outlet pipe 17 from the smoke box Ⅲ21, and the smoke enters the chimney 18 through the fan 19 driven by the motor 20. Heat exchanger Ⅰ14, heat exchanger Ⅱ24, heat exchanger Ⅲ23 and smoke box Ⅰ15, smoke box Ⅱ25, so the flue gas three-pass is realized, heat exchange efficiency is improved, and the number of tubes in heat exchangers Ⅰ, Ⅱ, and Ⅲ is guaranteed The flue gas flow rate decreases by 20% at a steady rate. Install a cold air inlet pipe 22 on the outside of the furnace body of the heat exchanger III23, and install a hot air outlet pipe 12 on the outside of the furnace body of the heat exchanger I14, so that the heat-absorbing medium enters the heat exchanger through the cold air inlet pipe 22. The heater flows out along the hot air flow direction 13 through the hot air outlet pipe 12, and the heat-absorbing medium flows smoothly in the horizontally arranged tube-and-tube heat exchanger, which reduces flow resistance, keeps the flow speed stable, and reduces the power of the supporting motor. The three-pass flow of flue gas reduces the air leakage coefficient of the furnace and improves the thermal efficiency. The design capacity of the horizontal tube-type coal-fired hot blast stove is 20000MJ/H.

Claims (1)

1. Horizontal tubular coal-fired hot blast stove, including insulation furnace wall, perlite insulation layer, furnace arch, furnace hearth, fire grate, partition wall, settling chamber, slag discharge door, fire door, ash cleaning door, coal hopper, It is composed of heat exchanger, flue gas outlet pipe, fan, motor and chimney. It is characterized in that the heat exchanger is divided into three groups, namely heat exchanger Ⅰ, heat exchanger Ⅱ and heat exchanger Ⅲ, which are installed horizontally at the rear of the settling chamber. One end of heat exchanger I is connected to the settling chamber, the other end is connected to smoke box I, one end of heat exchanger II is connected to smoke box I, the other end is connected to smoke box II, one end of heat exchanger III is connected to smoke box II, and the other end It is connected to the smoke box III, the smoke box III is connected to the flue gas outlet pipe, the flue gas outlet pipe is connected to the fan, and the fan is connected to the chimney. Install the cold air inlet duct.

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