A liquid ammonia mercerizing machine ammonia drying system

Abstract

The invention relates to an ammonia gas drying system for a liquid ammonia mercerizing machine. The ammonia gas drying system comprises a plurality of upper ammonia gas heating systems and lower ammonia gas heating systems arranged in a drying tank in a staggered mode in the fabric conveying direction. The drying tank is provided with high-temperature ammonia gas inlets and exhaust openings for exhausting heated ammonia gas. Each ammonia gas heating system comprises a high-temperature ammonia gas conveying channel, an adjusting screw rod, an adjusting beam and a breathable plate. The adjusting beams are arranged between the breathable plates and supporting hoods of the high-temperature ammonia gas conveying channels. The upper sides and the lower sides of the adjusting beams make seal contact with the breathable plates and the supporting hoods. The adjusting screw rods in all the ammonia gas heating systems conduct synchronous transmission through synchronous belts. The interval distance between the adjusting beams is adjusted through the adjusting screw rods so that the ventilation portions of the breathable plates can be matched with the size of the fabric for heating so as to form a heating area adjusting structure. The ammonia gas drying system has the advantages that the heating range can be adjusted according to the size of the fabric, the utilization rate of ammonia is increased, and the cost is reduced.

Description

Technical field [0001] The invention relates to an ammonia drying system of a liquid ammonia mercerizing machine. Background technique [0002] The fabric must be dried after being soaked in liquid ammonia, because the fabric generally contains a natural cellulose with a semi-crystalline structure of 60%-70%. We call this cellulose cellulose I, which is treated with liquid ammonia. It is later converted into cellulose with a polycrystalline structure, which we call cellulose II. The cellulose II structure is more stable and improves the performance of the fabric. After the fabric is impregnated with liquid ammonia, the excess ammonia in the fabric needs to be removed. If the temperature of the fabric is not higher than 25°C or it is removed in water, the cellulose that has been converted into cellulose II will return to the original cellulose I. , cellulose I cannot be converted into cellulose II, and liquid ammonia mercerization loses its meaning. Therefore, the purpose o...

AI Technical Summary

Problems solved by technology

Traditional roller heating has many disadvantages: the fabric directly contacts the high-temperature roller surface, the fibers of the fabric are easily burned, and the surface of the fabric is easily hardened, which affects the performance and feel of the fabric; roller heating cannot be applied to all Variety of fabrics, not suitable for fabrics with greater elasticity; roller heating cannot control the size of the fabric, and the subsequent sequence must be reshaped on other equipment

Roller heating needs water steam heating, and steam equipment is necessary, and the steam pipeline is relatively complicated, which wastes a lot of energy

[0004] In the traditional roller heating system, the excess ammonia gas is directly discharged from the tank to the recovery tower, so a large amount of ammonia is wasted and increases the burden on the recovery system

If other heating gases are used to heat the fabric, gases other than ammonia will be mixed in the tank, which will not only increase the difficulty of ammonia recovery, but also the mixing of ammonia and other gases is very dangerous; and if other gases are used for heating, it is necessary to add another equipment and resources, which increases the complexity of the equipment, increases the cost and reduces the efficiency

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