Two-stage integrative drying plant

Abstract

The invention relates to a two-stage integrative drying plant which is characterized by comprising an oven body (10), a drying unit (60) and a heat pump device (80), wherein the oven body (10) comprises a drying oven cover (20) and a base (50); a drying cavity (13) and a recovery cavity (14) which are mutually communicated are arranged in the drying oven cover (20); the drying unit comprises a fan (30) which is provided with an inlet channel (63), an exhaust channel (64) and an air outlet channel (68); the fan (30) is a tangential fan; the heat pump device (80) comprises a heat pump subcooler(82), a heat pump cooler (83), a middle cooler (84), a heat tube heat exchanger (95), a heat pump compressor (89), a heat pump throttling valve (87), a heat pump condenser (88), a cold compressor (99) and a refrigerant evaporator (96), wherein the cold compressor (99), the middle cooler (84), the heat pump compressor (89), the heat pump condenser (88), the heat pump throttling valve (87) and the refrigerant evaporator (96) are successively connected and loop the first and the last. The invention is suitable for processing equipment for continuous running thin strip objects and has the effectsof small volume, high efficiency and energy saving.

Description

technical field [0001] The invention relates to a two-stage integrated drying equipment, which is suitable for drying continuously traveling thin strip objects (hereinafter referred to as printed products), and is widely used in coating machines, compound machines, printing machines, roller coating lines, gluing machines, etc. Similar to processing equipment, it can also be used to dry continuously conveyed items. It belongs to the technical field of drying equipment such as printing and coating. Background technique [0002] At present, the equipment used for processing thin strip objects generally has the following characteristics: the printed product is a thin strip object that travels continuously, such as plastic film, thin metal plate, etc. in continuous processing. The surface of the processed product or product substrate is first covered with one or more layers of substances, such as ink, paint, glue, etc., using the transfer device of the equipment, and these subs...

AI Technical Summary

Problems solved by technology

However, this improvement scheme still has the following problems: 1. In order to control the cost of the device, the waste gas flow rate needs to be reduced, resulting in a more prominent explosion hazard; 2. In the process of waste gas treatment, a huge amount of additional energy is consumed, and the operating cost is high; 3. Activated carbon or activated carbon fiber is a consumable, which needs to be replaced regularly, resulting in an increase in cost and affecting production; 4. The desorption process will cause water pollution; the equipment is complex and bulky, occupying more valuable production sites, and causing more damage to the renovation project. 5. It does not help to improve product quality and avoid environmental impact on the production process

[0017] To sum up, the current drying equipment has the following disadvantages: 1. The drying gas enters and exits at the same time, which is difficult to meet the drying process requirements

2. The air blowing stroke is short, the air flow is small, the drying efficiency is low, the box is too long, and the control is difficult

3. Low heat utilization efficiency, excessive energy consumption and high operating costs

4. The air duct is complex and has many interfaces, the gas is easy to leak, the fan noise is loud, and the environmental protection is poor

5. The structure is complex, bulky, consumes a lot of steel, and the manufacturing cost is high

6. It is troublesome to install and transport, the cost is high, and it takes up a lot of space in the factory building

7. Organic solvents are harmful to the human body and the environment, and direct discharge will cause pollution

8. There are extremely economically valuable organic solvents and a large amount of heat in the exhaust gas, which cannot turn waste into treasure, resulting in high production consumption and reduced processing efficiency

9. In order to reduce the energy consumption of heating air, it is necessary to reduce the flow of fresh air, but it will cause the concentration of organic vapor to exceed the explosion limit and cause an explosion accident, which poses a serious safety hazard

10. A large amount of natural air is used, which makes the processing and production subject to the climate environment. When the ambient temperature is low, the energy consumption required for heating is huge, and even the drying needs cannot be met, resulting in production shutdown

11. The dust in the natural air affects the processing quality of the product

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