CN-121297529-B - Steam type heat exchanger for tobacco extraction

CN121297529BCN 121297529 BCN121297529 BCN 121297529BCN-121297529-B

Abstract

The invention relates to the technical field of tobacco recycling, and discloses a steam heat exchanger for tobacco extraction, which comprises a feeding and discharging cavity, a heating cavity and a transferring cavity. The feeding and discharging cavity is communicated with the transferring cavity through a heat exchange tube, the feeding and discharging cavity is provided with a layered plate upper cavity and a layered plate lower cavity, and the heat exchange tube penetrates through the heating cavity. The heating cavity is provided with at least 3 flow guiding plates in an up-down staggered way, the air inlet end is close to the space between the flow guiding plates of the feeding cavity and the discharging cavity, the air outlet end is close to the space between the flow guiding plates of the transfer cavity and the transfer cavity, and the flow guiding plates are provided with heat exchange tube mounting holes and vent holes. The bottom of the heat exchange tube below the heating cavity is provided with a gas guide plate, the gas guide plate is parallel to the heat exchange tube and is provided with a gap, and a drain hole is arranged between the two drainage plates at the tail part. The energy-saving heat exchanger reduces the temperature difference of the heating cavity, clears condensed water and adapts to multiple steam working conditions, improves the heat exchange energy-saving effect and the suitability, and solves the problems of large temperature difference, difficult condensate water clearing and difficult adaptation to multiple steam working conditions of the heat exchanger in tobacco extraction.

Inventors

TAO FENG
JIAO YANG
LIN JUAN
ZHU JIAJUN
ZHU JIANXIN
WU FANGJIE
YU XIAOXIA
MA CHENWEI

Assignees

杭州利群环保纸业有限公司

Dates

Publication Date: 20260508
Application Date: 20251204

Claims (9)

1. The utility model provides a steam type heat exchanger for tobacco extraction, includes business turn over material chamber (12), heating chamber (13) and transfer chamber (14), through heat exchange tube (18) intercommunication between business turn over material chamber (12) and the transfer chamber (14), two cavitys about separating into through setting up laminated board (121) in business turn over material chamber (12), heat exchange tube (18) pass in follow heating chamber (13), heating chamber (13) are provided with steam inlet end (16) and steam outlet end (17) respectively in the top that is close to one end and the below that is close to the other end, its characterized in that: The heating cavity (13) is internally provided with drainage plates (2) which are in singular number and at least 3 in a vertically staggered manner, the drainage plate (2) closest to the feeding and discharging cavity (12) and the drainage plate (2) closest to the transferring cavity (14) are both positioned at the upper position in the heating cavity (13), the steam inlet end (16) is arranged at the position between the drainage plate (2) closest to the feeding and discharging cavity (12) and the feeding and discharging cavity (12), the steam outlet end (17) is arranged at the position between the drainage plate (2) closest to the transferring cavity (14) and the transferring cavity (14), and the drainage plate (2) is provided with a heat exchange tube mounting hole (21) for penetrating through a heat exchange tube (18) and a vent hole (22) for slow ventilation; The bottom of the heat exchange tube (18) positioned at the lower part in the heating cavity (13) is provided with a gas guide plate (4), the gas guide plate (4) is parallel to the heat exchange tube (18) and a gap exists between the gas guide plate and the heat exchange tube (18), and the tail part of the gas guide plate (4) is provided with a drainage hole (41) in the area between the two drainage plates (2); The heat exchange tube (18) located at the bottom of the heating cavity (13) is arranged to be a special tube (3), triangular bosses (31) of a horizontal uniform array are arranged on the outer wall of the special tube (3), the cross sections of the triangular bosses (31) are triangular, the triangular cross sections of the triangular bosses (31) comprise long sides (311) and short sides (312) except for one side close to the inside of the special tube (3), the included angle between the long sides (311) and the short sides (312) is an obtuse angle, the long sides (311) face one side close to the feeding and discharging cavity (12), and the short sides (312) face one side close to the transfer cavity (14).
2. A steam heat exchanger for tobacco extraction according to claim 1, characterized in that the vent holes (22) are arranged above the heat exchange tube mounting holes (21) penetrating the special-shaped tube (3) on the drainage plate (2) positioned at the bottom of the heating cavity (13), the vent holes (22) are communicated with the heat exchange tube mounting holes (21) through vertical channels, the vent holes (23) are further arranged on the drainage plate (2) at the lower position of the heat exchange tube mounting holes (21) penetrating the special-shaped tube (3), the vent holes (23) penetrate through two sides of the drainage plate (2), the heat exchange tube mounting holes (21) are communicated with the corresponding vent holes (23) through vertical channels, and the lowest position of each vent hole (23) is higher than or flush with the air guide plate (4).
3. A steam heat exchanger for tobacco extraction according to claim 2, characterized in that the ventilation holes (22) are provided in a horn shape on the drainage plate (2) at the bottom of the heating chamber (13), and the opening of the ventilation holes (22) at the side close to the feeding and discharging chamber (12) is larger than the opening at the side close to the transfer chamber (14).
4. A steam heat exchanger for tobacco extraction according to claim 3, wherein the feeding and discharging cavity (12) is provided with a carbon dioxide inlet end (11) and a carbon dioxide outlet end (15), the carbon dioxide inlet end (11) is communicated with the lower cavity of the drainage plate (2), and the carbon dioxide outlet end (15) is communicated with the upper cavity of the drainage plate (2).
5. The steam heat exchanger for tobacco extraction according to claim 4, wherein a pressure release valve and a temperature sensor are further arranged on a pipeline for communicating the carbon dioxide inlet end (11) with the carbon dioxide storage tank, and a stop valve and a temperature sensor are further arranged on a pipeline for communicating the carbon dioxide outlet end (15) with the extraction kettle (5).
6. A steam heat exchanger for tobacco extraction as claimed in claim 3, wherein a partition plate (19) is provided between the feeding and discharging chamber (12) and the heating chamber (13) and between the transfer chamber (14) and the heating chamber (13), and the heat exchange tube (18) penetrates through the partition plate (19).
7. A steam heat exchanger for tobacco extraction according to claim 6, characterized in that the end of the air guide plate (4) is fixed to the partition plate (19) or the drainage plate (2).
8. A steam heat exchanger for tobacco extraction according to claim 3, wherein the air guide plate (4) is an arc plate, and one end of the air guide plate (4) close to the feeding and discharging cavity (12) is higher than one end close to the transferring cavity (14).
9. The steam type heat exchanger for tobacco extraction according to claim 3, wherein a guide structure is arranged on the inner wall of a vertical channel between the vent hole (22) and the heat exchange tube mounting hole (21), the guide structure is spiral or bar-shaped and can guide steam to form rotary flow in the channel, the contact effect of the steam and the outer wall of the special-shaped tube (3) is enhanced, the inner diameter of the vent hole (23) is larger than that of the vertical channel, and the outlet direction of the vent hole (23) faces to the upper area of the air guide plate (4), so that the steam passing through the vent hole (23) can directly act on condensed water above the air guide plate (4), and the condensed water on the outer wall of the special-shaped tube (3) is removed in an auxiliary manner.

Description

Steam type heat exchanger for tobacco extraction Technical Field The invention relates to the technical field of tobacco recycling, in particular to a steam heat exchanger for tobacco extraction. Background In the tobacco extraction process, the steam heat exchanger is a key device for heating an extraction medium (carbon dioxide), and the heat exchange efficiency and the temperature stability of the steam heat exchanger directly influence the extraction rate and the quality of effective components of tobacco. The existing steam type heat exchanger for tobacco extraction generally comprises a feeding cavity, a heating cavity and a discharging cavity, wherein the feeding cavity and the discharging cavity are communicated through a heat exchange pipe, and the medium in the heat exchange pipe is heated by utilizing the flow of steam in the heating cavity. However, the existing steam heat exchanger application has the following prominent problems in tobacco extraction: The upper and lower temperature differences of the heating cavity are obvious, and after the steam is introduced into the heating cavity, the steam is easy to flow rapidly along the inner side of the cavity, so that the newly-introduced high-temperature steam and condensed cold air gathered at the bottom form obvious temperature difference layering, the heat exchange uniformity is reduced, and the thermal stress can be generated due to overlarge temperature difference, so that the service life of equipment is influenced. Especially in the scene that tobacco extraction needs accurate accuse temperature, the difference in temperature fluctuation can lead to extracting medium uneven heating, and then influences the stability of tobacco active ingredient. The condensed water is not thoroughly removed, and the condensed water is easy to form after the steam releases heat on the surface of the heat exchange tube, and the condensed water is adhered to the outer wall of the heat exchange tube, especially the bottom area, so that a heat insulation layer can be formed to prevent heat transfer and reduce heat exchange efficiency. The existing equipment is mostly dependent on natural dripping or simple drainage structure, condensed water attached to the surface of a heat exchange tube cannot be effectively removed, and equipment corrosion can be caused by condensed water accumulation after long-term use. The suitability is poor, and the multi-working condition requirements are difficult to meet, namely, in the tobacco extraction process, according to the extraction process difference, the steam with different parameters (such as high-flow-rate low-temperature steam and low-flow-rate high-temperature steam) is required to be selected. The existing heat exchanger has the disadvantages that the steam circulation path is fixed, when the temperature difference between the steam and the extraction medium is small (such as a high-flow-rate low-temperature steam scene), the steam is easy to condense but cannot strengthen condensate water removal through an optimized flow path, and when the temperature difference is large (such as a low-flow-rate high-temperature steam scene), the steam is difficult to fully diffuse, so that the temperature distribution in the heating cavity is uneven, and the heat exchange effect under different working conditions cannot be considered. The problems not only reduce the efficiency and quality stability of tobacco extraction, but also increase the equipment maintenance cost, increase the energy consumption of the heat exchanger and restrict the application effect of the steam heat exchanger in the field of tobacco extraction. Therefore, developing an energy-saving steam heat exchanger capable of reducing the temperature difference of a heating cavity, efficiently removing condensed water and adapting to multiple working conditions becomes a technical problem to be solved in the field. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides the steam heat exchanger for tobacco extraction, which has the advantages of reducing the temperature difference of a heating cavity, removing condensed water, adapting to multiple steam working conditions and improving the heat exchange effect and suitability, and solves the problems that the temperature difference of the heating cavity is large, the condensed water is difficult to remove and the multiple steam working conditions cannot be adapted when the steam heat exchanger is applied to tobacco extraction. (II) technical scheme In order to achieve the above purpose, the present invention provides the following technical solutions: The steam heat exchanger for tobacco extraction comprises a feeding and discharging cavity, a heating cavity and a transferring cavity, wherein the feeding and discharging cavity is communicated with the transferring cavity through a heat exchange tube, the feeding and discharging cavity is divided int