CN204329525U - A kind of net belt type heat pump drying line - Google Patents

Abstract

A mesh belt type heat pump drying line, including a plurality of drying chambers connected in series, each drying chamber is equipped with a transmission mesh belt, and the discharge end of the transmission mesh belt in the previous drying chamber is connected to the The feeding end of the transmission mesh belt in the next drying chamber; each drying chamber is equipped with an independently controlled hot air supply mechanism, and the top of the drying chamber is provided with an exhaust mechanism; the hot air supply mechanism is equipped with a hot air Channel and heat pump, the exhaust mechanism is provided with an exhaust channel, the exhaust channel is connected with the hot air channel to form a gas circulation channel; the evaporator of the heat pump and the exhaust channel are formed to transfer the heat in the hot and humid gas to the heat pump The medium is used to realize the heat exchange mechanism of condensation and dehumidification; the condenser of the heat pump and the hot air passage form a heat exchange mechanism for transferring the heat in the heat pump medium to the airflow in the hot air passage to realize heat circulation, which realizes heat circulation and effectively reduced energy efficiency.

Description

A mesh belt heat pump drying line

technical field

The utility model relates to a drying equipment, specifically a mesh belt type heat pump drying line.

Background technique

 Drying equipment is required for drying in the fields of Chinese herbal medicine processing, food processing, and industrial product drying. At present, most of the large-scale industrialized material drying lines still use the boiler heating method. Whether it is a gas-fired boiler or a coal-fired boiler, the energy utilization rate is not high, and the exhaust smoke of the boiler will also cause environmental pollution. Some of the air-energy drying equipment that has appeared are also miniaturized equipment, and the hot and humid air during the drying process is directly discharged. For large-scale drying lines, due to the large footprint, how to make full use of limited land resources to achieve high-quality, low-energy drying is also a major problem to be solved.

Utility model content

The technical problem to be solved by this utility model is to provide a mesh belt heat pump drying line that can realize heat recycling.

The technical solution adopted by the utility model to solve the above technical problems is: a mesh belt type heat pump drying line, including a plurality of drying chambers connected in series, each drying chamber is equipped with a transmission network for conveying materials The discharge end of the transmission mesh belt in the previous drying chamber is connected to the feed end of the transmission mesh belt in the next drying chamber through the feeding device; each drying chamber is equipped with a hot air supply mechanism, and the outlet of the hot air supply mechanism The tuyere is located below the drying chamber, and an exhaust mechanism for discharging humid air is also provided above the drying chamber; the hot air supply mechanism is provided with a hot air channel and a heat pump, and the exhaust mechanism is provided with an exhaust channel , the exhaust channel is connected with the hot air channel to form a gas circulation channel; the evaporator of the heat pump and the exhaust channel form a heat exchange mechanism for transferring heat from the hot and humid gas to the heat pump medium to achieve condensation and dehumidification; the condensation of the heat pump The heat exchanger and the hot air channel form a heat exchange mechanism for transferring the heat in the heat pump medium to the airflow in the hot air channel to realize heat circulation.

The evaporator of the heat pump and the exhaust channel form a dehumidifier for direct heat exchange, or form a dehumidifier for indirect heat exchange through a heat exchange medium.

In the conveying direction of the material, the wind speed blown out by the hot air supply mechanism increases gradually.

In the conveying direction of the material, the conveying speed of different transmission mesh belts gradually decreases.

An auxiliary heater is also arranged in the hot air channel.

The air outlet of the hot air channel is provided with an air distribution device for dispersing the hot air along the width direction of the transmission mesh belt.

The hot air supply mechanism is provided with a blower, and the exhaust mechanism is provided with a dehumidifier.

The hot air supply mechanism is also provided with a heat pump device that extracts heat from air or water. The evaporator of the heat pump device exchanges heat with the air or water, and its condenser is used to heat the gas in the hot air channel to form hot air.

The multiple drying chambers are detachably connected, so that the drying production line can be moved at will, and moved to different locations according to needs, reducing the cost of building multiple production lines for users due to different seasons and different production areas, and reducing the cost caused by crops. Equipment idle costs caused by seasonal production characteristics.

The beneficial effect of the utility model is: adopting renewable clean energy: air heat energy, water source or geothermal energy, thereby ensuring energy saving of more than 50%. The hot and humid air discharged from the drying chamber is recycled by the heat pump as a part of the heat source. When the hot and humid air cools down and condenses, its heat is transferred to the heat pump medium and used for heating to form hot air, which realizes heat circulation and improves energy utilization. Reduced energy consumption. A multi-layer transmission mesh belt is set, and the conveying direction of the adjacent transmission mesh belt is opposite. The material conveyed by the upper transmission mesh belt falls to the lower transmission mesh belt and is reversely conveyed, so that the material reciprocates along its length in the drying chamber, thereby In the limited area of the drying room, the material transmission path should be extended as much as possible to reduce the operating cost of the enterprise. The material is conveyed layer by layer from top to bottom, and the humidity is gradually reduced, while the humidity of the hot air is gradually increased from the bottom to the top, so that the material and the hot air always have a relatively stable humidity difference, which ensures the uniformity of the drying speed of the material, thereby improving The quality of the product after drying. The installation of auxiliary heating facilities not only breaks the bottleneck of heat pump drying that can only reach a maximum of 85 degrees of hot air temperature, but also enables the drying line to reach any temperature required by the material under the premise of ensuring energy saving of more than 50% through auxiliary facilities, and broadens the drying capacity of materials The field can meet any material demand. The advent of this pump drying system meets the needs of large-scale centralized agricultural production and breaks the traditional production state of small heat pump dryers. It can not only operate continuously for 24 hours, but also can produce tens of tons or hundreds of tons per day. , to meet the production needs of large-scale agricultural product deep processing bases, in line with the development trend of large-scale modern agriculture.

Description of drawings

Fig. 1 is a schematic diagram of a plurality of drying chambers connected in series.

Figure 2 is a schematic diagram of the layout of the transmission mesh belt.

Fig. 3 is a schematic diagram of air circulation in the drying chamber.

Fig. 4 is a schematic diagram of the airflow heat transfer mode in the drying chamber.

Fig. 5 is a schematic diagram of the air distribution method in the drying chamber.

Fig. 6 is a schematic diagram of heat circulation mode.

Marks in the figure: 1. Material inlet, 2. Dehumidifier, 3. Humidity exhaust fan, 4. Heat pump, 5. Blower fan, 6. Transmission mesh belt, 7. Auxiliary heater, 8. Hot air channel, 9. Exhaust air Channel, 10, drying chamber, 11, condenser, 12, evaporator, 13, feeding device.

Detailed ways

The structural mode of the present utility model is described in detail below in conjunction with accompanying drawing.

A heat pump drying system, comprising a plurality of drying chambers 10 connected in series, each drying chamber is provided with a transmission mesh belt 6 for conveying materials, the transmission mesh belt 6 is provided with mesh holes capable of ventilation, and the mesh The hole size should not be smaller than the material. The discharge end of the transmission mesh belt in the previous drying chamber is connected to the feed end of the transmission mesh belt in the next drying chamber by the feeding device 13 . Each drying chamber 10 is provided with an independently controlled hot air supply mechanism. The air outlet of the hot air supply mechanism is located below the drying chamber 10, and an exhaust mechanism for discharging humid air is also provided above the drying chamber.

The hot air supply mechanism is provided with a blower 5 , a hot air channel 8 and a heat pump 4 . The hot air channel is connected to the condenser 11 of the heat pump 4 to form a heat exchanger for transferring the heat of the medium in the condenser to the airflow in the hot air channel. Driven by the blower 5, the airflow flows through the hot air passage and exchanges heat with the condenser 11 of the heat pump 4. The hot air formed after the airflow is heated is blown into the drying chamber from the air outlet of the hot air passage 8 to complete the drying of the material. In order to make the air flow evenly distributed, the air outlet of the hot air channel is provided with an air distribution device for dispersing the hot air along the width direction of the transmission mesh belt.

The exhaust mechanism is provided with a moisture exhaust fan 3 and an exhaust channel 9, and the hot air blown out by the hot air supply mechanism quickly takes out the moisture in the material during the process of passing through the wet material to form hot and humid air. The hot and humid air is driven by the exhaust fan 3 and enters the dehumidifier 2 through the exhaust channel 9 . The dehumidifier 2 can be composed of the evaporator 12 of the heat pump 4 and the exhaust channel 9 as shown in FIG. 3 . It can also be a heat exchanger with hot and humid gas passages and heat exchange medium passages as shown in FIG. The hot and humid air transfers heat to the heat exchange medium in the heat exchange medium channel to condense moisture and raise the temperature of the heat exchange medium. The moisture-removed air enters the hot air passage from the hot and humid air passage, so as to realize the circulation flow of dry air. The heat exchange medium channel is connected with the evaporator 12 of the heat pump, and transfers the heat of the heat exchange medium to the medium in the evaporator. The heat exchange medium transfers heat to the medium in the evaporator, and after being compressed by the compressor of the heat pump, it enters the condenser 11 again to heat the air to form hot air, thus realizing the circulation of heat.

A multi-layer transmission mesh belt 6 is arranged from top to bottom in the drying chamber. The hot air blown out by the hot air supply mechanism passes through the transmission mesh belt layer by layer from bottom to top, and is discharged by the exhaust mechanism. The transmission mesh belt of the uppermost layer is docked with the material inlet 1 of the drying chamber, and the transmission mesh belt of the bottom layer is connected with the discharge port of the drying chamber. The feed end of the belt protrudes from the discharge end of the upper drive mesh belt in the horizontal direction. The material falling from the discharge end of the upper transmission mesh belt can fall on the lower transmission mesh belt, and is reversely conveyed by the lower transmission mesh belt, thereby forming the reciprocating movement of the material in the drying chamber to extend the material conveying path, so as to fully Use limited land resources.

Considering that the volume of the material will shrink to varying degrees after being heated and dehydrated, in order to ensure the balance of the hot air penetration of the material on the mesh belt, the running speed of the mesh belt in different temperature zones and different drying sections should be controlled at different speeds to ensure Material distribution balance and drying balance, so the running speed of the transmission mesh belt 6 in each drying chamber 10 is also individually controlled. In order to maintain the balance of hot air penetration, in the conveying direction of the material, the conveying speed of different transmission mesh belts gradually increases and decreases, so that the transmission mesh belt upstream of the conveying direction can send the material to the downstream transmission mesh belt faster, So that the material is further accumulated on the downstream transmission mesh belt to compensate for the volume reduction of the material.

In order to make up for the lack of heating temperature of the heat pump, an auxiliary heater 7 can also be set in the hot air channel, and electric heating is used for auxiliary heating. According to the required drying temperature, the dual systems of heat pump heating and auxiliary heating can be automatically switched and controlled. The dehumidification blower 3 can be arranged at the upper air outlet of the dehumidifier, and can also be arranged at the lower air outlet.

The hot air supply mechanism is also provided with a heat pump device for extracting heat source from air or water, and the evaporator of the heat pump device exchanges heat with air or water.

The multiple drying chambers are detachably connected, so that the drying production line can be moved at will, reducing the cost for users to build multiple production lines due to different seasons and different production areas, and reducing the damage caused by the seasonal productivity characteristics of crops. Equipment idle costs.

Claims (9)

1. A mesh-belt heat pump drying line, characterized in that it includes a plurality of drying chambers (10) connected in series, and each drying chamber is equipped with a transmission mesh belt (6) for conveying materials. The discharge end of the transmission mesh belt in one drying chamber is connected to the feed end of the transmission mesh belt in the next drying chamber through the feeding device; each drying chamber (10) is equipped with a hot air supply mechanism, and the hot air supply mechanism The air outlet is located below the drying chamber (10), and an exhaust mechanism for discharging humid air is provided above the drying chamber; the hot air supply mechanism is provided with a hot air channel (8) and a heat pump (4), so The exhaust mechanism described above is provided with an exhaust channel (9), and the exhaust channel (9) is connected with the hot air channel (8) to form a gas circulation channel; the evaporator (12) of the heat pump (4) is connected to the exhaust channel ( 9) Form a heat exchange mechanism for transferring the heat in the hot and humid gas to the medium of the heat pump (4) to realize condensation and dehumidification; the condenser (11) of the heat pump (4) and the hot air channel (8) form a heat pump ( 4) The heat in the medium is transferred to the airflow in the hot air channel to realize the heat exchange mechanism of heat circulation. 2. A mesh belt heat pump drying line according to claim 1, characterized in that: the evaporator (12) of the heat pump (4) and the exhaust channel (9) form a dehumidifier for direct heat exchange, Or form a dehumidifier with indirect heat exchange through the heat exchange medium. 3. A mesh belt heat pump drying line as claimed in claim 1, characterized in that: in the conveying direction of the material, the wind speed blown out by the hot air supply mechanism gradually increases. 4. A mesh-belt heat pump drying line as claimed in claim 1, characterized in that: in the conveying direction of the material, the conveying speeds of different driving mesh belts gradually decrease. 5. A mesh belt heat pump drying line according to claim 1, characterized in that: an auxiliary heater (7) is also provided in the hot air channel. 6. A mesh belt heat pump drying line according to claim 1, characterized in that: the air outlet of the hot air channel is provided with an air distribution device for spreading the hot air along the width direction of the transmission mesh belt. 7. A mesh belt heat pump drying line according to claim 1, characterized in that: said hot air supply mechanism is provided with a blower (5), and the exhaust mechanism is provided with a dehumidification fan (3). 8. A mesh belt heat pump drying line as claimed in claim 1, characterized in that: said hot air supply mechanism is also provided with a heat pump device for extracting heat source from air or water, and the evaporator of the heat pump device is connected with the air or water for heat exchange. 9. A mesh-belt heat pump drying line according to claim 1, characterized in that: the plurality of drying chambers are detachably connected.