CN201709305U - Energy-saving grain drying equipment - Google Patents

Abstract

An energy-saving grain drying equipment, including a drying tower, a feeding device, a hot blast stove, a cooling fan, an angular air tank, a grain discharge device and a tower base. Angular air tanks, the gas outlets of the lowermost angular air tanks are on the side of the drying tower and connected to the waste heat collection chamber, which is connected to the water-gas separator, the lowermost angular air tanks and the upper angular air The groove is vertical, and the inlet ends of the adjacent two layers of angular air grooves on the upper side are respectively on both sides of the drying tower and connected with the hot air chamber. There is a flue gas dust removal and purification device connected to the mixing chamber. A waste heat recovery room is set in the furnace body. The waste heat recovery room is connected to the waste heat heating room. The waste heat heating room is connected to the heat exchange room. There is an air blast inlet outside the furnace at the bottom of the flue gas grate and separated gas outlet. The utility model has the advantages of high drying efficiency, high quality, small volume, environmental protection, energy saving and the like.

Description

Energy-saving grain drying equipment

technical field

The utility model belongs to the technical field of grain drying equipment, in particular to an energy-saving grain drying equipment.

Background technique

The water vapor produced in the drying tower of the existing grain drying equipment and the flue gas produced by the hot blast stove are generally not fully utilized, resulting in waste of heat energy and pollution to the environment. The reason is that the water content of the water vapor is too large to be used Drying food; the flue gas contains a lot of toxic and harmful substances, and it cannot be used for drying food. For the use of grain drying equipment in the cold winter of Northeast my country, the external temperature is low and the air humidity is generally 50%. Because the traditional structure of grain drying equipment simply increases the temperature of the hot air entering the tower, the hot air with high humidity takes a long time to dry grain and consumes a lot of coal. At the same time, when the cold coal enters the grate, the temperature difference between the inside and the outside is large, and the maintenance of the furnace temperature naturally consumes more energy.

Contents of the invention

The purpose of the utility model is to provide an energy-saving grain drying equipment which fully recycles and utilizes water vapor.

The purpose of this utility model is achieved as follows: it includes a drying tower composed of a grain storage section, a drying section, a slowing section, and a cooling section, a drying tower feeding device, a hot blast stove, a cooling fan, and a drying tower uniformly distributed There are angular air grooves arranged in layers, grain discharge device and tower base at the bottom of the drying tower. The gas outlets of the tanks are all on one side of the drying tower and connected to the waste heat collection chamber. The waste heat collection room is connected to the water-gas separator through the insulation pipe. The upper side of the lowermost angular air tank in each section is adjacent to the air inlet ends of two layers of angular air tanks on both sides of the drying tower and connected to the hot air chamber. The hot air inlet of the hot air chamber is connected to the hot blast stove, and the cold air inlet is The cold air blower is connected; the lower part of the heat exchanger of the heat exchange chamber of the hot blast stove is provided with a flue gas dust removal and purification device connected to the mixing chamber, and a gas separator connected to the water gas separator is provided on the furnace body near the coal inlet on the upper side of the grate. The waste heat recovery room, the waste heat recovery room is connected to the waste heat heating room with the flue gas pipe through the heating pipe installed in the combustion chamber, the waste heat heating room is connected to the heat exchange room, and there is an air blast inlet outside the furnace at the bottom of the flue gas grate And the separated gas outlet communicated with the water-gas separator.

The feeding device of the drying tower is a secondary lifting device.

The tower base is a column type tower base.

The waste heat heating chamber is provided with a separating air guide plate.

There is also an ash discharge guide plate on the lower side of the grate

The lowermost angular air tank in each section of the utility model is the moisture discharge layer. Since the outlet end of the angular air tank is connected to the waste heat collection chamber, the water vapor generated during moisture discharge is recycled to the water-gas separator through the heat preservation pipeline, and separated The hot air obtained after dehydration is divided into two parts, one part passes through the separation gas outlet to preheat the cold coal entering the grate and consumes the air required for combustion in the combustion chamber, and the other part enters the waste heat recovery chamber to enter the drying tower again for forming The hot and dry air required for drying grain; the air intake ends of the two adjacent layers of angular air grooves on the upper side of the lowermost angular air groove in each section are respectively connected to the hot air chamber on both sides of the drying tower, so that each The air intake directions of the two adjacent layers of angular air grooves above the lowermost layer of angular air grooves in the section are opposite, and from one side of the drying tower to the other side, the gas entering from the lower opening of the angular air grooves to the grain layer Diffusion, the drying effect is good, and the wind pressure is low; the hot and dry air entering the drying tower is composed of the recovered and separated hot air through the heat exchange of the heat exchanger and the flue gas purified by dust removal, making full use of energy, and the humidity of the hot and dry air can reach 0 to 10%; because the flue gas is discharged to the atmosphere after dust removal and purification, it is beneficial to environmental protection. During the recycling process, water vapor also preheats the cold coal that has just entered the grate, which can fully burn the coal in the grate, improve the efficiency of the hot blast stove, save the amount of coal used, and reduce production costs . The volume of the drying tower of the utility model is only 60% of that of the traditional drying tower, which greatly reduces the manufacturing cost. The utility model also has the advantages of small occupied area, simple operation, high drying efficiency and high quality of grain.

Description of drawings

Fig. 1 is a schematic diagram of a partial cross-sectional structure of the utility model.

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is a cross-sectional enlarged structural schematic diagram of the hot blast stove in Fig. 1 .

The utility model will be described in further detail below in conjunction with the accompanying drawings by examples, but the following examples are only examples of the utility model, and do not represent the limited scope of rights of the utility model, the scope of the utility model The claims shall prevail.

Detailed ways

Shown in Fig. 1-4, the main structure of the utility model comprises that it comprises the drying tower 1 that is made up of grain storage section, drying section, slow-down section, cooling section, drying tower feeding device, this feeding device Including conveyor 14, primary elevator 15, primary cleaning screen 16 and secondary elevator 17, hot blast stove 6, air cooler 3, four-blade mechanism grain discharge device at the bottom of the drying tower and column tower 8, each section of the drying tower There are three layers of angular air tanks evenly distributed inside, and the gas outlets of the lowermost angular air tanks 2 in each section are all on the side of the drying tower and connected to the waste heat collection chamber 10, which is connected to the water vapor through the heat preservation pipe 9 The separator 5 is connected, the lowermost angular air groove 2 in each section is perpendicular to the upper angular air groove 2a, 2b, and the uppermost two layers of angular air grooves 2a, 2b in each section The inlet ends of the air inlets are respectively connected to the hot blast chamber 11 on both sides of the drying tower, the hot blast inlet 12 of the hot blast chamber is connected to the hot blast stove, and the cold wind inlet 13 is connected to the air cooler 3; the hot blast stove includes a furnace body and a fire grate 28 , coal inlet 25, coal inlet hopper 24, ash door 26, heat exchanger 18, hot air blower 7, the lower part of heat exchanger 18 of the heat exchange chamber of the hot blast stove is provided with a connected flue gas dust removal and purification device connected to the mixing chamber 30. In the furnace body near the coal inlet 25 on the upper side of the grate 28, there is a waste heat recovery chamber 23 communicated with the water-gas separator 5. The waste heat recovery chamber 23 communicates with a flue gas pipe through the heating pipe 22 arranged in the combustion chamber. 20, the waste heat heating chamber communicates with the heat exchange chamber, and at the bottom of the flue gas grate 28, an air blast inlet 19 outside the furnace and a separated gas outlet 29 communicating with the water-gas separator 5 are also provided.

In order to improve the preheating effect of the separated air in the waste heat heating chamber, a separated air guide plate 21 is arranged in the waste heat heating chamber. Also be provided with ash outlet guide plate 27 at fire grate lower side, this ash outlet guide plate is higher than the near end of ash outlet door with respect to the far end of ash outlet door, very convenient when cleaning coal ash.

When working, the grain enters the drying tower 1 through the conveyor 14, the primary elevator 15, the primary cleaning screen 16 and the secondary elevator 17. The coal hopper 24 falls onto the fire grate 28, enters the furnace body of the hot blast stove through the coal inlet 25, and the air enters the combustion-supporting air from the air induction inlet 19 outside the furnace. The upper side of the chamber enters the flue gas pipeline 20, and then enters the heat exchange tube of the heat exchanger 18. The flue gas in the heat exchanger leads downward to the flue gas dust removal and purification device 30, and the flue gas after dust removal and purification in the dust removal and purification device passes through The flue gas circulation fan is introduced into the mixing chamber 4, and the amount of gas entering the mixing chamber is controlled by the balance valve 31. When the gas volume in the mixing chamber 4 is sufficient, the excess gas is discharged to the atmosphere through the flue gas circulation fan under the action of air pressure.

The separated air in the water-gas separator 5 is divided into two parts: a part passes through the separated gas outlet 29 to preheat the cold coal entering the fire grate and consume the air required for combustion in the combustion chamber, and its gas flow direction is shown by the solid arrow in Figure 4 As shown; the other part enters the waste heat recovery chamber 23, enters the heating pipe 22 from the waste heat recovery chamber 23, and performs further drying and heating in the heating pipe 22, and the flue gas that enters the waste heat heating chamber from the heating pipe 22 and the flue gas pipe 20 is carried out. After heat exchange, it enters the heat exchange chamber, and its gas flow direction is shown by the dotted line arrow in Figure 4. After the heat exchange chamber and the air outside the furnace are exchanged again between the heat exchanger 18 tubes, they are mixed with dust removal and purification in the mixing chamber 4. The flue gas forms dry hot air, which is blown into the drying tower by the hot air blower. Since the inlet ends of the two layers of angular air grooves on each section are respectively on both sides of the drying tower and connected to the ventilation pipes, the directions of the two layers of air inlets are opposite, and the air enters from one side of the drying tower to the other. Gas diffuses from the lower opening of the horn-shaped air groove to the grain layer, which has good drying effect and low wind pressure. The gas outlets of the lowermost angular air tanks are on the side of the drying tower and are connected to the waste heat collection chamber 10. The water vapor generated in the drying tower enters the waste heat collection chamber, and then enters the water-gas separator 5 through the insulation pipe 9. After the water is removed from the water-gas separator, the separated gas is obtained for recycling. The dried grain is cooled at the cold air inlet 11 at the lower part of the drying tower, and then discharged out of the drying tower by the four-blade mechanism grain discharge device to complete the entire drying process. In sum, the purpose of the utility model has been achieved.

Claims (5)

1. An energy-saving grain drying equipment, which includes a drying tower consisting of a grain storage section, a drying section, a slowing section, and a cooling section, a drying tower feeding device, a hot blast stove, a cooling fan, and a drying tower uniformly distributed There are angular air grooves arranged in layers, grain discharge device and tower base at the bottom of the drying tower. The air outlets of the tanks are all on one side of the drying tower and connected to the waste heat collection room. The waste heat collection room is connected to the water-gas separator through the insulation pipe. The upper side of the lowermost layer of angular air grooves in each section, the inlet ends of the adjacent two layers of angular air grooves are respectively on both sides of the drying tower and connected to the hot air chamber. The hot air inlet of the hot air chamber is connected to the hot blast stove, and the cold air inlet is connected to the The cold air blower is connected; the lower part of the heat exchanger of the heat exchange chamber of the hot blast stove is provided with a flue gas dedusting and purification device connected to the mixing chamber, and the furnace body near the coal inlet on the upper side of the grate is provided with a water-gas separator. The waste heat recovery room, the waste heat recovery room is connected to the waste heat heating room with the flue gas pipe through the heating pipe installed in the combustion chamber, the waste heat heating room is connected to the heat exchange room, and there is an air blast inlet outside the furnace at the bottom of the flue gas grate And the separated gas outlet communicated with the water-gas separator. 2. The energy-saving grain drying equipment according to claim 1, characterized in that: said drying tower feeding device is a secondary lifting device. 3. The energy-saving grain drying equipment according to claim 1, characterized in that: said tower base is a column-type tower base. 4. The energy-saving grain drying equipment according to claim 1, characterized in that: the waste heat heating chamber is provided with a separating air guide plate. 5. The energy-saving grain drying equipment according to claim 1, characterized in that: an ash discharge guide plate is provided on the lower side of the grate.

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