CN105758152B - Temperature air-source heat pump tower drier - Google Patents

Abstract

The invention discloses a high-temperature air source heat pump vertical dryer, which comprises a furnace body, a material inlet and a material outlet. The gas outlet and the exhaust gas outlet are connected with pipes. The furnace body is a double-cylinder structure. The double-cylinder structure is composed of an outer cylinder and an inner ring cylinder. Permeable air hole, the outside of the air hole is welded with a gas collecting cover, the inner wall of the outer cylinder is layered with fin rings, the outer cylinder is set with an inner ring tube, and the gap between the two forms a material layer. The bottom of the furnace body is used The partitions evenly separate the discharge units, each discharge unit is equipped with a discharge device, the inner ring is a mesh structure, and the middle of the vertical dryer is installed with a thermocouple to detect the temperature of the material. The drying temperature is about 90°, which is more suitable for drying materials with low ignition point, and the waste heat can be recycled repeatedly. It is an energy-saving and environmentally friendly clean energy dryer.

Description

High temperature air source heat pump vertical dryer

Technical field:

The invention relates to the field of dryers, in particular a high-temperature air source heat pump vertical dryer suitable for low-temperature drying and waste heat recovery and utilization.

Background technique:

Vertical dryer, also known as vertical dryer, is widely used to dry materials in the production process of briquette, cement, fertilizer, coal chemical industry, etc. It has the characteristics of small footprint, low investment and stable operation.

In recent years, through continuous development and improvement, there are many kinds of vertical dryers available on the market. Among them, the vertical dryer disclosed in the Chinese patent application with publication number CN167361A is one of many vertical dryers. kind. The vertical dryer includes a cylinder and a retaining ring and a lifting ring arranged in the cylinder. The retaining ring is a tapered sleeve that gradually becomes larger from top to bottom, which is located at the center of the cylinder and connected to the cylinder. The coaxial line is set, and the material channel is formed between the outer wall surface of the retaining ring and the inner wall surface of the cylinder; Coaxial setup. When using the vertical dryer, the material falls into the cylinder from the top of the cylinder and falls along the material channel formed between the material retaining ring and the inner wall of the cylinder, and the hot air enters through the air inlet on the cylinder. In the material retaining ring, the gap between two adjacent material retaining rings forms a hot air outlet, and the material is dried by the hot air blown through the hot air outlet during the falling process. But it is not suitable for low temperature drying requirements.

Secondly, at present, the heating source of most vertical dryers is coal or gas. The biggest hazard of this heating method is high pollution, which emits a large amount of carbon dioxide and causes serious pollution to the air. Secondly, it passes through the dust collector. The temperature of the exhaust gas discharged from the dryer to the atmosphere is about 100°C, and the waste heat exhaust gas cannot be recycled directly, which consumes a lot of available energy, which obviously limits the long-term sustainable development prospects of the vertical dryer. The calorific value of coal and gas is high, which is not suitable for drying materials with low ignition point, which may easily cause fire accidents and is not conducive to safe production.

From the above description of the working principle of the above-mentioned vertical dryer, it can be seen that there are two main factors affecting the variety, efficiency and development prospects of its drying materials, namely, the heating area of the material, the uniformity of heating and the form of the heat source used.

For the former, in order to improve the drying efficiency, the diameter of the cylinder can only be increased. Although this method can increase the output to a certain extent, it is not conducive to the smooth flow of materials, and the heating area of the air inlet is limited.

For the latter, if you want to adapt to the drying of materials with low ignition point, recover the waste heat of exhaust gas and use clean energy, at present, there is no information about the use of low-temperature heat source and clean energy to dry flammable materials in the prior art.

Invention content:

The task of the present invention is to propose a high-temperature air source heat pump vertical dryer which not only effectively utilizes waste heat but also saves a lot of energy consumption and reduces environmental pollution.

The task of the present invention is accomplished in this way, which includes a furnace body, a feed port and a discharge port, and is characterized in that: the furnace body is provided with an upper hot air inlet and a lower hot air inlet, and the middle part of the furnace body is provided with a waste gas The gas outlet and the waste gas outlet are connected with pipes, and the furnace body is a double-cylinder structure. The double-cylinder structure is composed of an outer cylinder and an inner ring cylinder. There are internal and external air holes in the area, and a gas collecting cover is welded on the outside of the air holes, and fin rings are arranged in layers on the inner wall of the outer cylinder, and the inner ring tube is set in the outer cylinder. The material layer, the bottom of the furnace body is evenly separated from the discharge unit by a partition, each of the discharge units is correspondingly equipped with a discharge device, the inner ring cylinder is a mesh structure, and the vertical dryer A thermocouple for detecting the temperature of the material is installed in the middle. The other end of the corresponding pipeline on the exhaust gas outlet is connected with a dust collector, and the outlet of the dust collector is connected to the inlet of the high-temperature air source heat pump system through a pipeline to form an exhaust gas recovery pipeline, and the outlet of the high-temperature air source heat pump system passes through the pipeline They are respectively connected with the upper and lower hot air inlets provided on the furnace body to form an air supply pipeline, and a bypass pipeline is connected between the outlet of the dust collector and the outlet of the high-temperature air source heat pump system. The arrangement of air holes is evenly distributed to form a plurality of exhaust gas outlets, and the installation position of the gas collecting hood corresponds to the upper and lower sides of the air holes opened on the outer cylinder to form a closed exhaust gas channel. The head of the inner ring tube is conical and the bottom is flat, and the head of the outer furnace body is flat and the bottom is a conical hopper. The high-temperature air source heat pump system is composed of a compressor, a condenser, an expansion valve, an evaporator, a circulating fan, a dry filter, a liquid separator, a liquid storage tank, an insulation box, an air supply pipe and an exhaust gas recovery pipe. The high temperature air source heat pump is installed outside the furnace body.

The invention has the following effects: the drying temperature is about 90°, which is more suitable for drying materials with low ignition point, and the waste heat can be recycled repeatedly. It is an energy-saving and environment-friendly clean energy dryer.

Description of drawings:

Fig. 1 is a schematic structural diagram of the high-temperature air source heat pump vertical dryer; Fig. 2 is a schematic structural diagram of the high-temperature air source vertical dryer system; Fig. 3 is a top view of Fig. 2 .

Drawing description: 1. Outer cylinder, 2. Upper hot air inlet, 3. Air collecting hood, 4. Fin ring, 5. Thermocouple, 6. Lower hot air inlet, 7. Air outlet, 8. Inner ring cylinder , 9, unloading device, 10, lower hopper, 11, clapboard, 12, vertical dryer, 13, dust collector, 14, high temperature air source heat pump system, 15, pipeline, 16, bypass pipeline.

detailed description:

The structure of the vertical dryer 12 involved in this technical solution is more reasonable, and the material intake air heating area is greatly increased, which is more suitable for drying low-ignition materials. system, the waste heat is fully utilized to form a closed-circuit circulation hot air system; the hot air temperature is about 90°, which is especially suitable for drying materials with low ignition points. The specific implementation is shown in Figure 1. The high-temperature air source heat pump vertical dryer 12 includes From the furnace body, the upper hot air inlet 2 and the lower hot air inlet 6 are arranged on the furnace body, the middle part of the furnace body is provided with a waste gas outlet 7, and a pipe 15 is connected to the waste gas outlet, and the other end of the pipe 15 is connected with a Dust collector 13, the outlet of the dust collector is connected to the inlet of the high-temperature air source heat pump system 14 through pipelines to form a waste gas recovery pipeline, and the outlet of the high-temperature air source heat pump system is respectively connected to the upper and lower parts of the furnace body through pipelines. The hot air inlets are connected to form an air supply pipeline, and a bypass pipeline 16 is connected between the outlet of the dust collector and the outlet of the high-temperature air source heat pump system.

The high-temperature air source heat pump system is composed of a compressor, a condenser, an expansion valve, an evaporator, a circulating fan, a dry filter, a liquid separator, a liquid storage tank, an insulated box, an air supply pipeline and an exhaust gas recovery pipeline, the above What is described is the prior art and will not be described in detail here.

The high temperature air source heat pump is installed outside the furnace body.

The top of the furnace body is a material inlet, and the bottom is a material outlet. The furnace body is a double-cylinder structure. The double-cylinder structure is composed of an outer cylinder 1 and an inner ring cylinder 8. The outer cylinder enters along the top The middle area between the hot air outlet 2 and the lower hot air inlet 6 is provided with internal and external air holes, and the air holes are evenly distributed to form a plurality of exhaust gas outlets. An air collecting cover 3 is welded outside the air holes. Further, the air collecting The installation position of the gas hood corresponds to the upper and lower sides of the air holes opened on the outer cylinder to form a closed exhaust gas channel. The exhaust gas is collected in the exhaust gas channel and discharged out of the furnace through the outlet air outlet set on the furnace body. The inner wall of the outer cylinder is arranged in layers. Ring 4, the purpose is that after the material enters the outer cylinder, it is used to block the material and alternately stagger the material in an orderly manner, without clogging, and it is also conducive to exhaust. The outer cylinder is fitted with an inner ring cylinder to form a material Layer, the head of the inner ring cylinder is conical, the bottom is flat, the head of the outer furnace body is flat, the bottom is a conical lower hopper 10, and the bottom of the furnace body is evenly separated by a partition 11 to separate the discharge unit, which is convenient The materials are unloaded sequentially, and each unloading unit is correspondingly equipped with an unloading device 9 .

The inner ring cylinder 8 has a mesh structure, and the mesh holes can be round holes, long holes, etc., which are determined and selected according to the minimum particle size of the material. The purpose is to ensure that the hot air ventilation area of the material entering the outer cylinder is more uniform. , The hot air inlet set at the lower part extends into the inner ring cylinder, and the hot air entering the inner ring cylinder from the upper and lower hot air inlets gathers evenly and diffuses from the mesh to the outer cylinder, thus ensuring that the material is heated evenly at the upper and lower sides.

The middle part of the vertical dryer of the present invention is installed with a thermocouple 5 for detecting the temperature of the material, and the number of thermocouples installed is at least two or more.

In particular, the invention relates to a high-temperature air source heat pump vertical dryer utilizing low-temperature drying and waste heat recovery and a drying system using the dryer. The high temperature air source heat pump vertical dryer includes a vertical furnace body and a material guide and ventilation part arranged in the furnace body. The lower and upper parts of the furnace body have hot air inlets. Dryer heat supply and dehumidification, the high temperature air source heat pump system consists of a compressor, a condenser, an expansion valve, an evaporator, a circulating fan, a dry filter, a gas-liquid separator, a liquid storage tank, an insulation box, an air supply pipe and Exhaust gas recovery pipeline composition. It is characterized in that the high temperature air source heat pump is located outside the furnace body. Since the furnace body of the air source heat pump vertical dryer has upper and lower hot air inlets, and the heat source is a high-temperature air source heat pump, when in use, a large amount of hot air enters the furnace body from the upper part and firstly interacts with the materials. The heat is exchanged and dried from the outside to the inside. A small amount of hot air enters from the bottom to exchange heat with the material to be dried, so that the material is completely dried before being discharged from the furnace. There is an air outlet in the middle. The exhaust gas discharged after heat exchange enters the dust collector through the return air duct and is divided into two paths. One path is directly returned to the dryer for recycling through the bypass pipe, and the other path enters the heat pump system. The heat pump system performs recovery and upgrading, and the water vapor in the return air is condensed and discharged by the evaporator. This not only effectively utilizes the waste heat, saves a lot of energy consumption, but also reduces environmental pollution. It is a clean energy vertical drying system.

Claims (6)

1. temperature air-source heat pump tower drier, it includes body of heater, charging aperture and discharging opening, it is characterised in that：The body of heater On be provided with top hot air inlet and bottom hot air inlet, be provided with waste gas gas outlet in the middle part of body of heater, it is right on waste gas gas outlet Pipeline is connected to, body of heater is double cylindrical structures, and double cylindrical structures are made up of outer cylinder, endocyclic tube, and the outer cylinder enters heat along top Air port and the intermediate region of bottom hot air inlet are provided with inside and outside penetrating stomata, and the outside weldings of the stomata have a gas collection Cover, the inwall higher slice of outer cylinder are arranged with wing circle, and both endocyclic tubes gap is set with the outer cylinder and coordinates the composition bed of material, The bottom of body of heater is uniformly separated out discharging unit with dividing plate, and device for discharging is correspondingly provided with each discharging unit, described interior Ring cylinder is network structure, and the thermocouple of detection temperature of charge is provided with the middle part of the tower drier.

2. temperature air-source heat pump tower drier according to claim 1, it is characterised in that：It is corresponding on waste gas gas outlet The other end of pipeline be connected with deduster, the outlet of the deduster passes through pipeline and the import phase of temperature air-source heat pump system Even form waste gas recovery pipeline, the temperature air-source heat pump system outlet by pipeline respectively with set on body of heater it is upper, Bottom hot air inlet, which is connected, forms air supply pipeline, is connected between the exit of deduster and the outlet of temperature air-source heat pump system Bypass duct.

3. temperature air-source heat pump tower drier according to claim 1, it is characterised in that：The arrangement of stomata is uniform Distribution forms multiple waste gas outlets, and corresponding composition is closed up and down with the stomata opened in outer cylinder for the installation site of the gas skirt Exhaust steam passage.

4. temperature air-source heat pump tower drier according to claim 1, it is characterised in that：The head of the endocyclic tube Tapered, bottom is plane, and the head of external furnace body is plane, and its bottom is broach hopper.

5. temperature air-source heat pump tower drier according to claim 2, it is characterised in that：The temperature air-source heat Pumping system is by compressor, condenser, expansion valve, evaporator, circulating fan, device for drying and filtering, liquid separation separator, fluid reservoir, guarantor Incubator body, air supply duct and exhaust gas recovery conduit are formed.

6. temperature air-source heat pump tower drier according to claim 2, it is characterised in that：The temperature air-source heat Pump is located at the outside installation of body of heater.