WO2019041789A1

WO2019041789A1 - Energy-saving and emission-reduction drying system for dry coater

Info

Publication number: WO2019041789A1
Application number: PCT/CN2018/080239
Authority: WO
Inventors: 林文茂
Original assignee: 林文茂
Priority date: 2017-08-29
Filing date: 2018-03-23
Publication date: 2019-03-07
Also published as: CN107297312A; CN107297312B

Abstract

An energy-saving and emission-reduction drying system for a dry coater, comprising a drying tunnel and a circulating treatment apparatus. A plurality of guide rolls used for conveying materials is provided in the drying tunnel. The drying tunnel is divided, in a material conveying direction, into a plurality of drying units sequentially connected in series. Multiple spray heads, an air inlet, and an upper air outlet are provided in each drying unit. The circulating treatment apparatus is connected to the air inlet at a film discharging end of the drying tunnel by means of an air pipe. The upper air outlet of each drying unit is respectively connected with the air inlet of the next drying unit, thereby forming an enclosed inner circulating drying system.

Description

Dry-coating machine drying system for energy saving and emission reduction

[Technical Field]

The invention relates to the field of dry coaters, in particular to an energy-saving and emission-reducing dry coater drying system.

【Background technique】

The drying tunnel of the commonly used dry coater adopts the traditional structural design. In the traditional drying system, the arching guide roller is arranged in the drying tunnel, the airflow through the heating device is heated to hot air, and the air inlet enters the drying tunnel. Then, it is directly discharged from the exhaust port, and its structure is unreasonable, and the drying effect is poor. For example, a dry laminating machine disclosed in Chinese Patent Publication No. CN 1035684A entitled "A Modified Dry Laminating Machine" has a drying tunnel at the top of the frame, and the conventional hot air drying system The disadvantage is that the energy efficiency ratio is poor, and the heat utilization rate is very low. The main reasons are: 1) insufficient contact between hot air and materials, so the drying effect is poor; 2) part of the heat in the drying process is directly emitted and lost, resulting in waste of energy. 3) If the drying tunnel is too long, the drying is uneven, the energy consumption is too large, and the construction cost and maintenance cost of the drying tunnel are increased. Therefore, the dry coater drying system needs to be improved.

[Summary of the Invention]

In view of the deficiencies of the prior art, the object of the present invention is to provide an energy-saving and emission-reducing dry coating machine drying system, which can repeatedly apply hot air in a drying tunnel to realize hot air recycling, discharge exhaust gas after treatment, and achieve energy saving. The effect of reducing emissions.

To achieve the above object, the present invention provides a solution of:

An energy-saving and emission-reducing dry coater drying system comprises a drying tunnel and a circulation processing device, wherein a plurality of guide rollers for conveying materials are arranged in the drying tunnel, and the drying tunnel is divided into several serially connected in the material conveying direction. Each of the drying units is provided with a plurality of nozzles, each of which is provided with an air inlet and an upper air outlet, and the circulation processing device connects the drying unit at the film outlet end of the drying tunnel through the air pipe. The air outlet and the upper exhaust port of the drying unit are respectively connected to the air inlet of the next drying unit to form a closed internal circulation drying system. The inner circulation drying system partially drys the material, so that the hot air is fully contacted with the material, thereby greatly improving the utilization rate of the hot air and effectively reducing the energy consumption.

Preferably, a plurality of nozzles above the guide roller of the drying unit are respectively connected to the air inlet, and each nozzle is located above the guide roller.

More preferably, the head is oriented perpendicular to the surface of the material such that the material can dry quickly and evenly within the drying unit. This solution allows the hot air to fully contact the material, greatly improving the utilization of the hot air and enabling more uniform drying of the various parts of the material.

Preferably, the drying unit is further provided with at least one lower exhaust port, and the lower exhaust port communicates with the outside, and discharges a small portion of the exhaust gas passing through the material of the guide roller in the drying unit (the temperature thereof is low) .

Preferably, the left side of the drying unit at the exit end of the film is provided with an exhaust port, and the exhaust port is connected to the circulation processing device. The exhaust port on the left side of the drying unit at the exit end sends hot air back to the circulation processing device for energy saving.

Preferably, the right side of the drying unit at the film inlet end is provided with an exhaust port, and the exhaust port is connected to the exhaust gas exhaust port through an exhaust gas treatment device. The exhaust port on the right side of the drying unit at the film inlet end is connected to the exhaust gas exhaust port through an exhaust gas treatment device, thereby reducing the effect.

In a preferred solution, the hot air of each drying unit passes through the upper exhaust port through the balancing valve, enters the regulating valve, and is sent to the next drying unit through the fan.

In a preferred embodiment, each of the drying units is separated by a column plate, and the column plate is provided with a slit for allowing material to pass through. The column plate separates the drying channels so that the hot air between the material in the drying unit and the column plate forms an independent cycle, thereby improving the energy saving effect.

Preferably, the drying unit has a wind pressure detecting device for monitoring the wind pressure in the drying unit.

Preferably, the drying unit has a temperature detecting device for monitoring the temperature in the drying unit.

Preferably, the circulating treatment device has an outside air inlet port, and the upper fan blows the air into the circulation processing device to form a hot air to be delivered to the film drying end drying unit.

More preferably, the recycling device is a heat pump, or other similar heat source. Heat pumps are new sources of energy that have received worldwide attention in recent years. A heat pump is a device that can obtain low-level heat energy from natural air, water or soil, and work through electric energy to provide high-level heat energy that can be used by people.

In the solution of the invention, the number of drying units is four.

The beneficial effects of the present invention against the prior art are:

1) Several drying units in the drying tunnel are connected in series, and each drying unit is separated by a column plate, and the heat is fully utilized to improve the energy efficiency ratio.

2) The exhaust port on the left side of the drying unit of the film outlet feeds the hot air back to the circulation processing device, and the exhaust ports of the drying units are respectively connected to the air inlets of the next drying unit to form a closed internal circulation drying system, which realizes Recycling of hot air, improving energy efficiency, saving energy costs, reducing exhaust emissions, and achieving energy saving and emission reduction.

[Description of the Drawings]

Figure 1 is a perspective view of a drying system of the present invention.

Figure 2 is a schematic view of the structure of a drying unit of the drying system

Figure 1 - first drying unit; 2 - second drying unit; 3 - third drying unit; 4 - fourth drying unit; 5 - drying tunnel; 6 - guide roller; 7 - air inlet; 8 - cycle Processing device; 9-first air inlet; 10-first nozzle; 11-first upper exhaust port; 12-first balance valve; 13-first lower exhaust port; 14-second air inlet port; 15-second nozzle; 16-second upper exhaust port; 17-second balance valve; 18-second lower exhaust port; 19-third air inlet; 20-third nozzle; 21-third Exhaust port; 22-third balance valve; 23-third lower exhaust port; 24-four fourth air inlet; 25-fourth nozzle; 26-fourth upper exhaust port; 27-fourth balance valve; 28-fourth lower exhaust port; 29-column plate; 30-exhaust gas exhaust port; 31-first air regulating valve; 32-first fan; 33-second air regulating valve; 34-second fan; - third air conditioning valve; 36 - third fan; 37 - fourth fan; 38 - fifth fan.

【Detailed ways】

The present invention will be further described below in conjunction with specific embodiments:

The invention discloses a dry coating machine drying system applied to energy saving and emission reduction. Referring to Figures 1 and 2, the drying system of the invention comprises a circulation processing device 8 and a drying tunnel 5, and an air inlet is introduced at the upper end of the circulation processing device 8. 7. A fifth fan 38, an exhaust gas exhaust port 30 and a fourth fan 37. The drying tunnel 5 is provided with a plurality of guide rollers 6 for conveying materials, and the drying tunnels 5 are divided into several serially connected in the material conveying direction. In the present embodiment, the lower left side arrow of the first drying unit 1 is the film exit end, and the lower right side arrow of the fourth drying unit 4 is the film entrance end, and the conveying line formed by the guide roller 6 passes through the fourth drying unit 4 in sequence. The third drying unit 3, the second drying unit 2 and the first drying unit 1 are disposed at the upper end of the first drying unit 1 and are connected to the circulation processing device 8 through a gas pipe. In the present embodiment, the number of drying units is four, which are the first drying unit 1, the second drying unit 2, the third drying unit 3, and the fourth drying unit 4, respectively, and the four drying units are sequentially connected in series to form an arch shape structure. The circulation processing device 8 in this embodiment is a heat pump.

In order to effectively utilize the heat energy contained in the hot air in the drying tunnel, in the invention, the excess hot air of the current drying unit is sent to the adjacent drying unit by using the exhaust device above the drying unit. In the present embodiment, the first upper exhaust port 11 of the first drying unit 1 is connected to the second intake port 14 of the second drying unit 2, and passes through the first balancing valve 12, the first regulating valve 31 and the first A fan 32. Similarly, the second upper exhaust port 16 of the second drying unit 2 is connected to the third intake port 19 of the third drying unit 3, passing through the second balancing valve 17, the second regulating valve 33 and the second fan 34. . The third upper exhaust port 21 of the third drying unit 3 is connected to the fourth intake port 24 of the fourth drying unit 4, and passes through the third balancing valve 22, the third regulating valve 35, and the third fan 36. The left air pipe of the first drying unit 1 is connected to the circulation processing device 8, and the fourth upper air outlet 26 of the fourth drying unit 4 is connected to the circulation processing device 8, and passes through the fourth balancing valve 27, while the right air pipe and The cycle processing device 8 is connected.

The drying unit is further provided with a pressure sensor for detecting the magnitude of the wind and a temperature sensor for detecting the temperature.

Based on the above arrangement, when the hot air drying system of the present invention operates, air enters from the air intake port 7, and the fan 38 sends air to the circulation processing device 8, and the circulation processing device 8 heats the air to form hot air through the air pipe from the first intake air. The mouth 9 enters the first drying unit 1, and all the first nozzles 10 above the guide rollers in the first drying unit 1 are perpendicular to the surface of the material, and the first nozzle 10 sprays hot air onto the material of the guide roller, and is blocked by the column plate 29, The hot air forms a small inner circulation in the first drying unit 1, so that the material can be dried quickly and uniformly, and the drying effect is improved, and a small portion of the solvent exhaust gas passing through the material is obtained from the two first sections below the first drying unit 1. The exhaust port 13 is directly discharged, and the return hot air passes through the first upper exhaust port 11 of the first drying unit 1 through the first balancing valve 12, the first regulating valve 31 and the first fan 32, and finally enters the first The second intake port 14 of the drying unit 2. At the same time, the left air pipe of the first drying unit 1 returns excess hot air to the circulation processing device 8 to improve the heat energy recovery utilization rate. Similarly, the guide roller in the second drying unit 2 has a plurality of second nozzles 15 , and the hot air entering the second air inlet 14 passes through the second nozzle 15 to spray hot air onto the guide roller material, so that the material is quickly and uniformly dried. a small portion of the solvent exhaust gas passing through the material is directly discharged from the two second lower exhaust ports 18 below the second drying unit 2, and the return hot air passes through the second upper exhaust port 16 of the second drying unit 2 again. After passing through the second balancing valve 17, the second regulating valve 33 and the second fan 34, it finally enters the third intake port 19 of the third drying unit 3. Similarly, the guide roller in the third drying unit 3 has a plurality of third nozzles 20, and the hot air entering the third air inlet 19 is sprayed on the guide roller material through the third nozzle 20 to quickly and uniformly bake the material. The dry, small portion of the solvent exhaust gas passing through the material is directly discharged from the two third lower exhaust ports 23 below the third drying unit 3, and the return hot air passes through the third upper exhaust port of the third drying unit 3 21 passes through the third balancing valve 22, the third regulating valve 35 and the third fan 36, and finally enters the fourth intake port 24 of the fourth drying unit 4. The guide roller in the fourth drying unit 4 has a plurality of fourth nozzles 25, and the hot air entering the fourth air inlet 24 passes through the fourth nozzle 25 to spray hot air onto the material of the guide roller, so that the material is quickly and evenly dried, small Part of the solvent exhaust gas passing through the material is directly discharged from the two fourth lower exhaust ports 28 below the fourth drying unit 4, and the right side of the fourth drying unit 4 also sends the solvent exhaust gas to the exhaust gas treatment device. The exhaust gas exhaust port 30 is discharged.

When the LEL (lower explosive limit) of the solvent in the coating process exceeds the national standard value, it is necessary to increase the displacement of the fourth drying unit. To this end, another solution is to allow the intake port of the third damper valve 35 to be connected to an intake pipe that communicates with the outside.

Since the drying tunnel 5 is divided into a plurality of drying units, the hot air is sprayed forward onto the material, which increases the contact area between the hot air and the material, so that as much hot air as possible can transfer heat with the material, thereby improving the hot air. The utilization rate improves the drying effect, and then uses the convection of the air, the hot air rises, the cold air drops, the hot air with the higher temperature above is sent from the upper to the next drying unit, and the lower temperature air is discharged from below. To ensure the drying effect of hot air in the next drying unit. Through experiments, compared with the conventional technology, the emission reduction of the exhaust gas reaches more than two-thirds, and the energy saving can reach more than three-quarters.

Compared with the conventional drying system, the drying system of the invention greatly improves the energy utilization rate, the independent drying unit ensures the drying effect, the recycling of the circulating hot air saves the energy consumption, and the exhaust gas treatment device reduces the exhaust gas displacement, It has reached the effect of energy saving and emission reduction.

In addition, it should be noted that the specific embodiments described in the specification may have different names and the like, and equivalent or simple changes made by the structures, features and principles described in the patent concept of the present invention include Within the scope of protection of the present invention. A person skilled in the art can make various modifications or additions to the specific embodiments described or in a similar manner, without departing from the scope of the invention or the scope defined by the claims. All should fall within the scope of protection of the present invention.

Claims

An energy-saving and emission-reducing dry coater drying system comprises a drying tunnel and a circulation processing device, wherein a plurality of guide rollers for conveying materials are arranged in the drying tunnel, and the drying tunnel is divided into several serially connected in the material conveying direction. a drying unit, wherein each of the drying units is provided with a plurality of nozzles, each of the drying units is provided with an air inlet and an upper air outlet, and the circulation processing device is connected to the film outlet by a gas pipe connection drying tunnel. The air inlet of the drying unit and the upper exhaust port of each drying unit are respectively connected to the air inlet of the next drying unit to form a closed inner circulation drying system.
The energy-saving and emission-reducing dry coater drying system according to claim 1, wherein a plurality of nozzles in the drying unit are respectively connected to the air inlet, and each of the nozzles is located above the guide roller.
The energy-saving and emission-reducing dry coater drying system according to claim 2, wherein the head is oriented perpendicular to the surface of the material.
The energy-saving and emission-reducing dry coater drying system according to claim 1, wherein the drying unit is further provided with at least one lower exhaust port, and the lower exhaust port is in communication with the outside.
The energy-saving and emission-reducing dry coater drying system according to claim 4, wherein the left side of the drying unit at the film exiting end is provided with an exhaust port, and the exhaust port is connected to the circulation processing device.
The energy-saving and emission-reducing dry coater drying system according to claim 4, wherein the right side of the drying unit at the film inlet end increases an exhaust port, and the exhaust port passes through the exhaust gas treatment device and the exhaust gas exhaust port. connection.
The energy-saving and emission-reducing dry coater drying system according to claim 1, wherein the hot air of each drying unit passes through the upper exhaust port through the balancing valve, enters the regulating valve, and is sent to the next drying unit through the fan. in.
The energy-saving and emission-reducing dry coater drying system according to claim 1, wherein each of the drying units is separated by a column plate, and the column plate is provided with a slit for allowing material to pass.
The energy-saving and emission-reducing dry coater drying system according to claim 1, wherein the drying unit has a wind pressure detecting device and a temperature detecting device.
The energy-saving and emission-reducing dry coater drying system according to claim 1, wherein the circulation processing device is provided with an external air inlet, and the upper fan blows the air into the circulation processing device to form a hot air to be heated. The film exit end is in the drying unit.