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CN-122006274-A - Hot air distributor for spray drying tower with multiple spray guns

CN122006274ACN 122006274 ACN122006274 ACN 122006274ACN-122006274-A

Abstract

The invention discloses a hot air distributor for a spray drying tower with multiple spray guns, and belongs to the technical field of hot air drying equipment. The hot air distributor comprises an L-shaped flow guide air channel, a hot air distribution chamber, a plurality of spray gun air distribution cylinders and spray guns, wherein the outlet end of the L-shaped flow guide air channel is connected to the center of a top cover of the hot air distribution chamber, the hot air distribution chamber is formed by encircling the top cover of the hot air distribution chamber, a wall body of the hot air distribution chamber and an air heat insulation layer below the wall body of the hot air distribution chamber, the spray gun air distribution cylinders are uniformly distributed in the hot air distribution chamber along the circumferential direction, the inlet of each spray gun air distribution cylinder is communicated with the hot air distribution chamber, the outlet of each spray gun air distribution cylinder downwards passes through the air heat insulation layer and is led into the drying tower, the number of the spray guns corresponds to that of the spray gun air distribution cylinders, and each spray gun is coaxially arranged in the corresponding spray gun air distribution cylinder. The invention realizes the technical effects of uniform distribution of air quantity of each spray gun, low flow resistance of the system, good wall sticking resistance of the tower top and flexible spray gun layout, and effectively solves the problems of uneven distribution of hot air of multiple spray guns, high energy consumption, easy adhesion of materials and the like.

Inventors

  • YANG GUANGWEN
  • HUANG WENPAN
  • XU JING
  • CHEN YIYU
  • GAO CHONGBO

Assignees

  • 迈安德集团有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (11)

  1. 1. A hot air distributor for a multi-spray gun spray drying tower, which is installed at the top of a drying tower body, and is characterized by comprising: the outlet end of the L-shaped diversion air duct (1) is connected with the center of the top cover (2) of the hot air distribution room; The hot air distribution chamber (7) is formed by enclosing a top cover (2) of the hot air distribution chamber, a wall body (3) of the hot air distribution chamber and an air heat insulation layer (4) below, and a plurality of spray gun air distribution cylinders (5) are arranged in the hot air distribution chamber (7); the spray gun air distribution cylinders (5) are uniformly distributed in the hot air distribution chamber (7) along the circumferential direction, the inlet of each spray gun air distribution cylinder (5) is communicated with the hot air distribution chamber (7), and the outlet of each spray gun air distribution cylinder passes through the air heat insulation layer (4) downwards and is led into the drying tower; the spray guns (6) are corresponding to the spray gun air distribution cylinders (5), each spray gun (6) is coaxially arranged in the corresponding spray gun air distribution cylinder (5) in a penetrating mode, and the spray nozzles of the spray guns extend into the drying tower.
  2. 2. The hot air distributor for the spray drying tower with the plurality of spray guns as claimed in claim 1, wherein the L-shaped diversion air duct (1) sequentially comprises a rectifying device (1 a), a horizontal straight section (1 b), a bending section provided with a diversion baffle plate (1 c), a shrinkage rectifying cone section (1 d) and a lower straight section (1 e) along the air flow direction.
  3. 3. The hot air distributor for the multi-spray gun spray drying tower according to claim 1, wherein the spray gun air distributing barrel (5) is of a double-layer cone-shaped structure, a first air guiding cone welding piece (5 e) and a second air guiding cone welding piece (5 f) which are coaxially nested are arranged in the spray gun air distributing barrel, and the space in the barrel is divided into an air distributing barrel first flow passage (5 h) and an air distributing barrel second flow passage (5 i).
  4. 4. A hot air distributor for a spray drying tower with multiple spray guns according to claim 3, wherein the inlet of the first runner (5 h) of the air distributor is provided with a first guide blade grid (5 c), and the inlet of the second runner (5 i) of the air distributor is provided with a second guide blade grid (5 d).
  5. 5. The hot air distributor for a multi-lance spray drying tower according to claim 4, wherein said first guide blade row (5 c) and said second guide blade row (5 d) are each comprised of a plurality of radially equispaced blades.
  6. 6. The hot air distributor for the multi-spray gun spray drying tower according to claim 1, wherein the air heat insulation layer (4) is of a hollow circular sandwich structure, a wind distributing barrel connecting pipe (4 c) for the spray gun wind distributing barrel (5) to pass through is arranged on the air heat insulation layer (4), and a cold air main pipe (4 a) for introducing cooling air is further connected to the air heat insulation layer (4).
  7. 7. The hot air distributor for the multi-spray gun spray drying tower according to claim 6, wherein a cold air distribution triangular ring (4 d) is circumferentially arranged at the periphery of the lower end of each air distribution barrel connecting pipe (4 c), the cross section of the cold air distribution triangular ring (4 d) is a right triangle, and a plurality of cold air outlet holes (4 e) are circumferentially and uniformly distributed at the right bottom edge of the cold air distribution triangular ring (4 d).
  8. 8. The hot air distributor for a multi-spray gun spray drying tower according to claim 7, wherein the inlet of the cold air distribution triangle ring (4 d) is connected with the cold air header pipe (4 a) through a cold air branch pipe (4 b).
  9. 9. The hot air distributor for the multi-spray gun spray drying tower according to claim 8, wherein a separation ring is arranged between the right-angle vertex and the bevel midpoint of the cross section of the cold air distribution triangular ring (4 d), a cold air distribution cavity is arranged between the separation ring and the right-angle bottom edge, and an air heat insulation cavity is arranged between the separation ring and the outer wall of the air distribution barrel connecting pipe (4 c).
  10. 10. The hot air distributor for a multi-lance spray drying tower according to claim 1, wherein the lance (6) is a single fluid pressure lance or a two fluid lance.
  11. 11. The hot air distributor for a multi-spray gun spray drying tower according to claim 1, wherein a plurality of the spray gun air distribution cylinders (5) are uniformly distributed in the hot air distribution chamber (7) in a single circle or a plurality of circles.

Description

Hot air distributor for spray drying tower with multiple spray guns Technical Field The invention relates to a spray drying tower, in particular to a hot air distributor for a multi-spray gun spray drying tower, and belongs to the technical field of hot air drying equipment. Background The spray drying tower is used in drying material in biological pesticide, medicine, food microbe and other fields and has the operation principle of dispersing material liquid into fog drops via atomizer and contacting with hot air or other hot medium gas to obtain granular product. The distribution of the flow field and the uniformity of the air flow in the drying tower have important influence on the drying effect of materials, which is a common problem facing the drying industry for a long time. For high throughput pressurized spray drying towers, limited by the upper flow limit of single-rod spray guns, it is often desirable to use multiple-rod spray guns operating in parallel to increase throughput. The distribution state of hot air at the spray nozzle of each spray gun directly influences the drying efficiency, the product granularity and the water content of the material fog corresponding to the spray gun. To ensure consistency of the quality of the product produced by each spray gun, it is necessary to ensure a high consistency of the hot air distribution at each spray gun. At present, aiming at the hot air distribution of a spray drying tower with multiple spray guns, two structural types of porous plates and air distributing cylinders are mainly adopted, but the two structural types have respective limitations: 1. Porous plate type distributor, such as "a novel spray drying tower" with publication number CN201025426Y and "a hot air distributor" with publication number CN203861941U, homogenizes air flow by providing a single layer or multiple layers of distribution plates with vertical openings in the inlet cone section. The main defects of the technology are that (a) the ventilation resistance of a porous plate is high, so that the energy consumption of a system is high, (b) the flatness of the porous plate and the parallelism between the multi-layer plates are difficult to ensure in processing and installation for a large tower body, the air flow is easy to deviate, the air-homogenizing effect is influenced, (c) the air flow is diffused after passing through discrete small holes, a concentrated and high-speed air column is difficult to form at a spray gun nozzle, the heat and mass exchange efficiency is required to be improved, and (d) a high-temperature area at the bottom of a distributor lacks heat insulation measures, and heat-sensitive or viscous materials are easy to adhere and denaturize. 2. A spoiler and uniformly-distributed plate combined distributor, such as a hot air distribution device and a spray drying tower with publication number CN116407854B and application, adopts a spoiler, a uniformly-distributed plate and a distributed plate combination with inclined through holes, and aims at considering air flow uniformity and concentration. However, the structure is complex, the processing precision and the installation perpendicularity requirements of a plurality of pore plates are extremely high, and the implementation difficulty is high. Also, the bottom lacks cooling protection, and there is a risk of sticking to the walls. In addition, in the case of a multi-gun arrangement, the patent does not specifically optimize the structure for the problem of uneven air volume caused by the difference of the distance between each gun and the air inlet. 3. The air distributing cylinder type distributor is a pressure spray drying tower with the publication number of CN201476502U, and adopts a structure that a central air homogenizing chamber is matched with a plurality of vertical air distributing cylinders which are circumferentially and uniformly distributed. The main problems are (a) that each air distribution cylinder axially enters air from the top of a central air distribution chamber, the air flow short circuit of the air distribution cylinder near the center is easy to occur due to the difference of the fluid resistance caused by the difference of the radius of the cylinder body from the central air inlet, the air quantity of the air distribution cylinder near the center is insufficient, the working condition consistency of each spray gun is poor, (b) that the spray gun is directly exposed to high-temperature hot air of the air distribution chamber, the feed liquid in the spray gun is possibly heated too early, the product quality is affected, and (c) the cooling protection of a heat sensitive area is not considered in the tower top structure. 4.L A hot air box, such as a sanitary low-wind-resistance L-type hot air box with a publication number of CN110332794B, adopts an L-type air channel to match with a baffle plate, a compression section and a guide plate to reduce wind resistance and improve airflow rec