CN202786549U - Oven-drying and adjusting device for viscose fibers - Google Patents

Abstract

The utility model discloses a drying and regulating device for viscose fibers, which comprises a feeder corresponding to a drying regulating mechanism, a chain conveying device is arranged in the drying regulating mechanism, the front area and the middle of the drying regulating mechanism The water vapor outlets in the zone are all connected to the air inlet of the oscillating flow heat pipe heat exchanger, and the air outlet of the oscillating flow heat pipe heat exchanger is connected to the rear area of the drying adjustment mechanism. It can obtain higher quality viscose fiber and save energy consumption by 35-40%.

Description

Drying and Conditioning Device for Viscose Fiber

technical field

The utility model relates to a drying and regulating device for viscose fibers.

Background technique

Viscose fiber has always been regarded as a high-pollution, high-energy-consuming, high-cost industry. At present, my country's viscose fiber production accounts for about 60% of the world's production, resulting in a large increase in energy consumption and sewage discharge, energy consumption and environmental protection issues. It has become one of the "bottleneck" problems restricting the further rapid development of my country's viscose industry. Among them, the overall energy consumption level of the viscose industry is 10-30% higher than the international advanced level. In addition, there are still many problems in the treatment of "three wastes". Therefore, energy saving and emission reduction have become the core tasks of the sustainable development of the viscose industry.

In the viscose fiber industry, the dryer is one of the high-energy-consuming equipment, and it is also the focus of energy conservation and emission reduction. At present, ordinary warm-air dryers are usually used, and drying 1 ton of viscose fiber consumes about 2.8 tons of steam. The temperature of the dry tail gas is about 110°C, and the water vapor content is about 60-70%. The direct discharge of the tail gas with a large amount of waste heat will cause huge energy waste on the one hand, and serious environmental pollution on the other hand.

The drying and conditioning of viscose fiber usually adopts curtain type or drum dryer to dry in sections and sections. The drying medium temperature in the front area is 70-100°C; in the middle area 100-120°C; in the rear area 60-70°C; then Enter the humidity control stage. The loosened wet fiber is sent to the sheet conveying curtain by the feeder, and the fiber layer on the conveying curtain is kept at a height of about 100mm, and the moving speed is 0.82-3.7m/min. In the drying process, the high-pressure hot steam plays the role of heating and raising the temperature to vaporize the water, and the fresh air plays the role of carrying humidity. The dry tail gas in this traditional drying system cannot effectively recover waste heat. There are two main reasons for this: first, the drying medium used in these three sections is a mixture of steam and air, and the dry tail gas contains a large amount of unwanted condensable gas, and the specific heat of the air is small, and only a small part of the sensible heat of the dry tail gas can be recovered after the heat exchanger is installed; In the fin-and-tube heat exchanger, the capillary fibers will accumulate on the fins, blocking the passage and reducing the surface heat transfer coefficient. Therefore, in the existing viscose fiber drying process, the residual heat of the drying tail gas cannot be effectively recovered, resulting in a great waste of energy.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art and provide a drying and adjusting device for viscose fiber, which can dry viscose fiber with higher quality, and can save energy consumption up to 35% in the drying process. ~40%.

In order to achieve the above object, the utility model adopts the following technical solutions:

A viscose fiber drying and adjusting device, including a feeder, the feeding machine corresponds to the drying adjustment mechanism, the drying adjustment mechanism is equipped with a chain conveying device, and the water vapor outlets in the front and middle areas of the drying adjustment mechanism All are connected with the air inlet of the oscillating flow heat pipe heat exchanger, and the air outlet of the oscillating flow heat pipe heat exchanger is connected with the rear area of the drying adjustment mechanism.

The drying adjustment mechanism includes a front area and a middle area composed of at least two superheated steam dryers connected in parallel, and a rear area composed of a hot air dryer, and the chain conveying device runs through the front area, the middle area and the rear area , The lower part of the chain conveying device in the front area and the middle area is equipped with a superheated steam device.

The superheated steam device includes a circulation fan, the air outlet of the circulation fan communicates with the steam heating coil, the air outlet of the steam heating coil communicates with a plurality of first uniform air supply devices, and the first uniform air supply device is located at the lower part of the chain conveying device ; The steam heating coil is connected with a temperature-controlled automatic regulating valve.

A second air blower is provided in the rear area, the air inlet of the second air blower communicates with the air outlet of the oscillating flow heat pipe heat exchanger, and the air outlet of the second air blower communicates with a plurality of second uniform air supply devices.

A pressure controller is provided on the pipe connecting the water vapor outlet of the front zone and the middle zone to the air inlet of the oscillating flow heat pipe heat exchanger.

The air inlet and outlet of the oscillating flow heat pipe heat exchanger are respectively connected with the first blower and the induced draft fan, and the induced draft fan is connected with the pressure controller.

The heat exchanging elements in the oscillating flow heat pipe heat exchanger are capillary light pipes.

The utility model includes two superheated steam drying areas and a hot air drying area, which improves the drying process of the existing curtain type or drying drum type dryers, and no longer blows fresh air into the front and middle areas of drying, and It uses superheated steam for indirect heating, and a circulating fan is installed inside for repeated cycles. After the water evaporates, the steam pressure in the drying unit reaches a certain set value, and then it is exhausted by the exhaust fan to the oscillating flow heat pipe heat exchanger. At this time, the drying is exhausted. Steam is pure steam and does not contain non-condensable gases. Therefore, the use of oscillating flow heat pipe heat exchangers can effectively recover waste heat. Dry exhaust steam can be condensed after heat recovery, releasing a large amount of latent heat of vaporization. Most of the waste heat can be effectively recovered. At the same time, the main heat exchange element in the oscillating flow heat pipe heat exchanger is a capillary light tube, which is not easy to deposit capillary fibers, and the material of the tube can effectively resist the corrosion of oil and weak acid gas generated during the fiber drying process. Oscillation The flow heat pipe heat exchanger has high heat exchange efficiency, flexible form, and is not easy to accumulate dust. It is especially suitable for the recovery of waste heat in the drying system of viscose staple fiber.

In addition, the waste heat recovered by the oscillating flow heat pipe heat exchanger is used to heat the fresh air, and the heated fresh air is directly transported by the fan to the rear area of the viscose fiber for drying, which can fully meet the drying requirements of the rear area at 60-70 °C. need.

The uniform air supply device, the chain conveying device, and the temperature-controlled automatic regulating valve in the utility model are all existing equipment, and are not repeated here.

The beneficial effect of the utility model is that the improved pure superheated steam drying device can effectively improve the drying quality of viscose staple fiber, and at the same time, a large amount of waste heat of dry steam can be effectively recovered, and the recovered waste heat is used to heat fresh air, Hot air is used for hot air drying in the rear area, and the improved new drying process can save about 35-40% of drying energy consumption.

Description of drawings

Fig. 1 is a flow chart of the utility model system;

Among them, 1-superheated steam dryer, 2-hot air dryer, 3-pressure controller, 4-steam heating coil, 5-circulation fan, 6-induced fan, 7-oscillating flow heat pipe heat exchanger, 8-first Uniform air supply device, 9-feeder, 10-chain conveying device, 11-first air supply fan, 12-second air supply fan, 13-temperature control automatic regulating valve, 14-second uniform air supply device.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in accompanying drawing 1: the drying and regulating device of viscose fiber comprises feeding machine 9, and feeding machine 9 is corresponding to drying regulating mechanism, and chain conveying device 10 is arranged in drying regulating mechanism, and the front of drying regulating mechanism The water vapor outlets in the zone and the middle zone are all connected to the air inlet of the oscillating flow heat pipe heat exchanger 7, and the air outlet of the oscillating flow heat pipe heat exchanger 7 is connected to the rear area of the drying adjustment mechanism.

The drying adjustment mechanism includes a front area and a middle area consisting of at least two superheated steam dryers 1 connected in parallel, and a rear area composed of a hot air dryer 2. The chain conveyor 10 runs through the front area, the middle area and the rear area. Zone, the lower part of the chain conveying device 10 in the front zone and the middle zone are equipped with superheated steam devices.

The superheated steam device includes a circulating fan 5, the air outlet of the circulating fan communicates with the steam heating coil 4, and the air outlet of the steam heating coil 4 communicates with a number of first uniform air supply devices 8, which are located in the chain The lower part of the conveying device 10 ; the steam heating coil 4 is connected with a temperature-controlled automatic regulating valve 13 .

A second air blower 12 is arranged in the rear area, and the air inlet of the second air blower 12 communicates with the air outlet of the oscillating flow heat pipe heat exchanger 7 , and the air outlet of the second air blower 12 communicates with a plurality of second uniform air supply devices 14 . A pressure controller 3 is provided on the pipe connecting the water vapor outlet of the front zone and the middle zone to the air inlet of the oscillating flow heat pipe heat exchanger 7 .

The air inlet and outlet of the oscillating flow heat pipe heat exchanger 7 are connected to the first blower 11 and the induced fan 6 respectively, and the induced fan 6 is connected to the pressure controller 3 . The heat exchange element in the oscillating flow heat pipe heat exchanger 7 is a capillary light tube.

Drying and adjustment process of the present utility model are as follows:

It includes at least 2 superheated steam dryers 1 (front zone and middle zone) and 1 hot air dryer 2 (back zone). Deep drying and conditioning are carried out in dryer 2.

The viscose fiber is sent to the front area of the superheated steam dryer 1 by the feeder 9, and under the action of the circulation fan 5, the drying medium (70-100°C) heated by the steam coil 4 passes through the first uniform air supply device 8 Send it to the drying room to dry the viscose fiber, the viscose fiber is dried and the water evaporates at the same time, the pressure in the superheated steam dryer 1 rises, the pressure controller 3 and the induced draft fan 6 are linked to discharge the excess water vapor To the oscillating flow heat pipe heat exchanger 7,

Under the action of the chain conveying device 10, the viscose fiber is transported to the middle zone of the superheated steam dryer 1. The drying process is similar to that of the front zone, the only difference is that the temperature of the drying medium is different, and the temperature of the drying medium in the middle zone is about 100-120 ℃, and at the same time discharge the excess water vapor to the oscillating flow heat pipe heat exchanger 7,

The fresh air heated by the oscillating flow heat pipe heat exchanger 7 is sent to the hot air dryer 7 by the second air blower 12 through the second uniform air supply device 14 to complete the deep drying and adjustment of the viscose fiber, and the exhaust gas after drying .

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (7)

1. the oven dry of a viscose and adjusting device, it is characterized in that, comprise and feeding to machine, feed corresponding with dry governor motion to machine, be provided with chain conveyor in the dry governor motion, the steam outlet in the He Zhong district, proparea of dry governor motion all links to each other with the air inlet of Oscillatory flow heat pipe exchanger, and the air outlet of Oscillatory flow heat pipe exchanger is connected with the back zone of dry governor motion.

2. device as claimed in claim 1, it is characterized in that, described dry governor motion comprises the He Zhong district, proparea that is comprised of two superheat steam drying devices that are connected side by side at least, and the back zone that is formed by hot-air drier, described chain conveyor runs through proparea, middle district and back zone, and the chain conveyor bottom is equipped with the superheated steam device in the He Zhong district, described proparea.

3. device as claimed in claim 2, it is characterized in that, described superheated steam device comprises circulating fan, described circulating fan air outlet communicates with steam(-)coil, the air outlet of steam(-)coil communicates with some the first balanced ventilation devices, and the first balanced ventilation device is positioned at the chain conveyor bottom; Be connected with the temperature control automatic regulating valve on the steam(-)coil.

4. device as claimed in claim 1 is characterized in that, is provided with the second pressure fan in the described back zone, and the air inlet of the second pressure fan communicates with the air outlet of Oscillatory flow heat pipe exchanger, and the air outlet of described the second pressure fan communicates with some the second balanced ventilation devices.

5. device as claimed in claim 1 is characterized in that, the steam outlet in He Zhong district, described proparea is provided with pressure controller with the pipeline that the air inlet of Oscillatory flow heat pipe exchanger links to each other.

6. device as claimed in claim 5 is characterized in that, the linking to each other with air-introduced machine with the first pressure fan respectively into and out of the air port of described Oscillatory flow heat pipe exchanger, described air-introduced machine links to each other with described pressure controller.

7. device as claimed in claim 1 is characterized in that, the heat exchange element in the described Oscillatory flow heat pipe exchanger is the capillary light pipe.