Bottom pot for brewing white spirit and direct-fired distillation device for producing white spirit

Abstract

The invention relates to a bottom pot for baijiu brewing and a direct-fired distillation device for baijiu production, and belongs to the technical field of distillation devices in the baijiu production process. The bottom pot comprises a pot body with a pot bottom, the interior of the pot body is a volume space, the edge of the pot bottom is connected with an annular periphery extending downwards, and the annular periphery and the pot bottom form a heating space with a lower opening; the periphery of the annular periphery is provided with an outer wall in sealed connection with the pot body, the annular periphery and the bottom of the outer wall are in sealed connection with an annular bottom edge, the annular periphery is in sealed connection with the pot bottom, the annular periphery, the outer wall and the annular bottom edge form an interlayer space, and the interlayer space is communicated with the volume space of the pot body; a plurality of heat exchange pipes are fixedly arranged on the inner circumferential wall of the annular periphery, and the two axial ends of each heat exchange pipe correspondingly communicate with the interlayer space. The heating efficiency of the bottom pot and the heating uniformity of the wine retort can be effectively improved, and a good energy-saving effect is achieved.

Description

Technical Field

[0001] The invention relates to a bottom pot for liquor brewing and a direct-fired distillation device for liquor production, belonging to the technical field of distillation devices in the liquor production process. Background Art

[0002] Currently, the production of baijiu (white liquor) is typically completed through a distillation process. In existing baijiu production processes, distillation typically uses steam provided by a steam boiler as a heat source. The retorts used for distillation are typically flat-bottomed or slightly curved. Steam is introduced into the retorts, where it heats and distills the fermented mash above. This centralized heating system requires a steam boiler, steam pipelines, and associated control valves and operating control equipment. This not only requires significant equipment investment and maintenance costs for the steam pipelines, valves, and control equipment, but also increases costs due to the long steam pipelines connecting each workshop. Heat loss during transportation is significant, further increasing costs. Another drawback of centralized steam heating is that the heating time for each retort is inconsistent. Consequently, the start and stop of the steam supply pipelines for each retort affects the steam pressure within the pipelines, leading to uneven steam heating pressure across the retorts. This results in temperature fluctuations during distillation, making it difficult to control the heating amount, and thus affecting the yield and quality of each retort's fermented mash.

[0003] The widespread availability of gas fuel and the ease of controlling the heating capacity of gas heating have made it possible to controllably heat each retort with gas fuel. This overcomes the limitations of centralized heating systems, which often result in high production costs and limited assurance of both production volume and quality. Consequently, numerous solutions have emerged in the prior art for direct bottom-combustion heating using the retort's bottom pot.

[0004] The applicant's previous solution was a wine retort pot disclosed in Chinese patent publication CN1318566C. This pot comprises a pot body with a bottom, within which is a volumetric space. The edge of the bottom is connected to a downwardly extending annular periphery, which, together with the pot bottom, forms a heating space with a lower opening. The annular periphery is provided with an outer wall, which is sealed to the pot body. The annular periphery is sealed to the bottom of the outer wall by an annular bottom edge, which is sealed to the pot bottom. The interlayer space formed by the annular periphery, the outer wall, and the annular bottom edge communicates with the volumetric space of the pot body. The above-mentioned solution utilizes a downwardly extending annular periphery connected to the edge of the pot bottom, forming a heating space with a lower opening with the annular periphery and the pot bottom. A gas nozzle extends from this lower opening, burning and heating the gas fuel within the relatively enclosed heating space. This effectively utilizes heat energy, minimizes heat loss, and easily controls the amount of heat generated. Furthermore, it offers the advantages of low equipment investment, low maintenance costs, independent heating of each retort, guaranteed wine quality, and low production costs. Furthermore, connecting the interlayer space formed by the annular periphery, outer wall, and annular bottom edge to the volumetric space of the pot body further improves thermal efficiency and helps prevent the retort from drying out, which significantly impacts wine quality. However, in the above-mentioned solution, only the burner is used to directly heat the pot bottom. Since the central area of ​​the burner output is directly heated, steam is typically generated first in the central area of ​​the pot body, while steam generation in the outer peripheral areas lags behind. Consequently, heating efficiency and the uniformity of the generated steam need to be further improved. The uniformity of the steam generated by the bottom pot directly affects the yield and quality of the base liquor produced from the lees in the retort.

[0005] In addition, there are other direct-fired bottom pot heating solutions in the prior art. For example, Chinese patent document CN205170807U discloses a gas-fired bottom pot heating system for a wine retort. The bottom pot heating system consists of a bottom pot body, a gas nozzle, a combustion heat exchanger, a jacketed flame baffle, a heat exchange tube, a smoke pipe, a waste heat recovery device, and a smoke outlet. The combustion heat exchanger is fixed inside the bottom pot body, one end of which is connected to the gas nozzle and the other end is connected to the waste heat recovery device through the smoke pipe. The tail end of the waste heat recovery device is the smoke outlet. The combustion heat exchanger is fixed inside the combustion heat exchanger with a jacketed flame baffle and heat exchange tubes. This solution arranges the heat exchange tubes vertically in the bottom pot, and the direct-fired flame heats the heat exchange tubes horizontally. This has the problem of water boiling first on the sides of the bottom pot, resulting in uneven heating and uneven steaming. In addition, the heat exchange tubes may fall into the heat exchange tubes, making them difficult to clean, affecting the quality of the distilled liquor and producing unpleasant odors. If the heat exchange tubes are completely blocked, the bottom pot can easily be burned.

[0006] Chinese patent publication number CN108841555A discloses a brewing pot heating device, comprising a pot body, a heat exchanger mounted within the pot body, and connected to a burner and an exhaust pipe. The burner heats the heat exchanger, which heats water for evaporation within the pot body, and the exhaust pipe discharges exhaust gases from fuel combustion. A certain amount of water is added to the pot body, submerging the heat exchanger. The burner heats the heat exchanger, and the heat generated by the heat exchanger is absorbed by the water within the pot body. Exhaust gases from fuel combustion are discharged through the exhaust pipe. During the distillation process, the heat exchanger is completely submerged in water, and the heat generated by the burner heating the heat exchanger is directly absorbed by the water for evaporation, thereby greatly improving the thermal efficiency of the device. This solution also arranges the heat exchange tubes vertically within the pot body, with the direct combustion flame heating the heat exchange tubes horizontally. This leads to problems such as water boiling first on the sides of the pot, resulting in uneven heating and uneven steam generation. In addition, lees and other substances may also fall into the heat exchange tubes, which are difficult to clean, affecting the quality of the distilled liquor and producing off-flavors. If the heat exchange tubes are completely blocked, the bottom pot may be easily burned.

[0007] A Chinese patent document with publication number CN205170811U discloses an energy-saving direct-fired gas-fired bottom pot for brewing wine. The bottom pot comprises a bottom pot body, an immersion heat exchanger, and a water measuring bucket. The immersion heat exchanger is located at the bottom of the bottom pot body, with the front end of the immersion heat exchanger connected to an air duct, and the rear end of the immersion heat exchanger connected to the exhaust gas inlet of the water measuring bucket via an exhaust pipe. The combustion nozzle of the combustion assembly is located within the pipe of the immersion heat exchanger, and the combustion assembly is connected to a gas pipe. The immersion heat exchanger in this scheme is volute-shaped, with the burner arranged horizontally. The mixed gas burns at the pipe mouth, and the high-temperature flue gas generated heats the bottom pot water through the pipe wall. The flame burning at the pipe mouth has the problem of high temperature at the front end and low temperature at the back end, resulting in uneven heating. In addition, the high-temperature flue gas of this device easily forms carbon deposits in the pipe, which imparts a burnt smell to the wine, and the inner wall of the pipe is difficult to clean.

[0008] From the solutions described in the above four patent documents, it can be seen that a long-standing technical problem in this field is how to improve the heating efficiency of the bottom pot and the heating uniformity of the wine steamer when using a bottom pot heated by direct-fired gas. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a bottom pot for liquor brewing, which can effectively improve the heating efficiency of the bottom pot and the heating uniformity of the wine retort.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a bottom pot for brewing white wine, including a pot body with a bottom, the inside of the pot body is a volume space, the edge of the pot bottom is connected with a downwardly extending circular periphery, the circular periphery and the pot bottom constitute a heating space with a lower opening; the outer periphery of the circular periphery is provided with an outer wall sealed with the pot body, the circular periphery and the bottom of the outer wall are sealed with an annular bottom edge, the circular periphery is sealed with the pot bottom, the circular periphery, the outer wall and the annular bottom edge form an interlayer space, and the interlayer space is connected with the volume space of the pot body; a plurality of heat exchange tubes are fixedly provided on the inner circumferential wall of the circular periphery, the heat exchange tubes are arranged at intervals in the left and right directions, and the axial ends of each heat exchange tube are respectively connected with the front side area and the rear side area of ​​the interlayer space.

[0011] A further preferred solution is: the axis of each heat exchange tube is arranged to extend obliquely along the front-to-back direction, the heat exchange tube is composed of a first heat exchange tube and a second heat exchange tube arranged in an alternating manner, the front end position of the first heat exchange tube is lower than the rear end position, the front end position of the second heat exchange tube is higher than the rear end position, and the front end position of the second heat exchange tube is at the same height as the rear end position of the first heat exchange tube, and the rear end position of the second heat exchange tube is at the same height as the front end position of the first heat exchange tube; multiple heat exchange tubes are arranged evenly spaced along the left-to-right direction; the interlayer space is connected to the volume space of the pot body through an annular cavity.

[0012] A further preferred solution is that the angle between the axis of the heat exchange tube and the horizontal plane is 5° to 15°.

[0013] A further preferred solution is that the angle between the circular periphery and the pot bottom is an acute angle.

[0014] A further preferred solution is: a sewage pipe is provided at the bottom of the interlayer space, and a steam inlet pipe is connected to the bottom of the pot body near the bottom of the pot; an exhaust pipe is fixedly provided on the outer wall and the circular periphery, and the exhaust pipe connects the heating space and the outer space of the outer wall; a flame observation pipe is fixedly provided on the outer wall and the circular periphery, and a flame detector is provided in the flame observation pipe.

[0015] Correspondingly, the present invention also provides a direct-fired distillation device for producing liquor, comprising a bottom pot and a burner, wherein the burner is used to heat the bottom pot, and the bottom pot is fixedly installed on the equipment base; the bottom pot adopts the bottom pot for liquor brewing described above, and the equipment base comprises a support seat, the top surface of the support seat is used to support the annular bottom edge of the fixed bottom pot, and the lower opening of the heating space of the bottom pot is equipped with a reflector, which is used to reflect the radiant heat at the reflector back to the bottom of the pot, and the reflector is an integrated structure in the shape of an inverted cone and is coaxially arranged with the circular periphery of the bottom pot, and the outer periphery of the reflector is provided with a reflector. The edge forms a closed connection with the lower end of the inner circumference of the circular periphery of the bottom pot. The center position of the reflector is a mounting hole, and the burner is fixedly installed in the mounting hole. The burner includes a burner shell, the burner shell has a mixed gas chamber and a plurality of spray holes facing the bottom of the pot. The burner shell is provided with a gas input pipe and an air input pipe communicating with the mixed gas chamber. The burner shell is equipped with an ignition mechanism for igniting the mixture of gas and air sprayed from the spray hole. One end of the burner shell with the spray hole extends out of the upper end surface of the mounting hole of the reflector.

[0016] A further preferred solution is: a flue wall is fixedly provided on the top surface of the support seat in the peripheral area of ​​the outer wall of the bottom pot, and the outer wall of the bottom pot, the flue wall and the top surface of the support seat are combined to form a closed annular flue, and a sealing block is provided in the annular flue, which completely closes the radial flow section of the annular flue; the annular flue is provided with a flue gas inlet on one side of the sealing block, and a flue gas outlet on the other side of the sealing block, and the smoke inlet and smoke outlet of the annular flue are both arranged at a position close to the sealing block, the smoke inlet is arranged on the outer wall of the bottom pot, and is connected to the heating space of the bottom pot through the exhaust pipe, and the smoke outlet is arranged on the flue wall and is connected to the workshop flue.

[0017] A further preferred scheme is: a refractory brick masonry layer, an insulation board layer and a reinforced concrete board layer are sequentially overlapped on the lower surface of the reflector, the lower surface of the reflector is in contact with the refractory brick masonry layer, and the reinforced concrete board layer and the support seat are an integrated structure; a burner mounting pipe is embedded and fixed in the reinforced concrete board layer, and the burner mounting pipe extends vertically downward from the lower surface of the reinforced concrete board layer, and the lower end of the burner mounting pipe has a first connecting flange, and the outer surface of the burner shell has a second connecting flange, and a sealing gasket is provided between the first connecting flange and the second connecting flange, and is fixed by bolts; a thermal insulation layer is pre-set in the flue wall and arranged in the circumferential direction of the annular flue, and the thermal insulation layer includes a vertical section of the thermal insulation layer and a horizontal section of the thermal insulation layer fixed as one, and the horizontal section of the thermal insulation layer is located at the top of the vertical section of the thermal insulation layer and extends toward the direction close to the bottom pot.

[0018] A further preferred solution is: it includes a wine steamer and a condensing device, the wine steamer is fixedly mounted on the top of the bottom pot; the top of the wine steamer is connected to the inlet of the condenser in the condensing device through a wine vapor delivery pipe, the condensing device has a cooling water inlet pipe and a cooling water outlet pipe, and the bottom of the pot body is connected to a steam inlet pipe near the bottom of the pot; a flue heat exchanger is provided in the workshop flue at a position close to the flue gas outlet of the annular flue, the flue heat exchanger has a water vapor pipeline and a flue gas exhaust pipeline that can exchange heat with each other, the water vapor pipeline has a water inlet end and a steam output end, the inlet of the flue gas exhaust pipeline of the flue heat exchanger is connected to one end of the workshop flue close to the flue gas outlet of the annular flue, the outlet of the smoke exhaust pipeline is connected to one end of the workshop flue away from the flue gas outlet of the annular flue, the water inlet end of the flue heat exchanger is connected to the cooling water outlet pipe of the condensing device, and the steam output end is connected to the inlet end of the steam inlet pipe of the bottom pot.

[0019] A further preferred solution is that the burner includes a fan, the burner housing includes a circular cylindrical body with an axis vertically arranged, the lower end of the circular cylindrical body is an air inlet, and the upper end is an air outlet, a combustion head is fixedly installed in the air outlet of the burner housing, and the area between the air inlet of the burner housing and the input end of the combustion head constitutes a mixed gas chamber, the air input pipe is connected to the outlet end of the fan, the outlet end of the air input pipe is connected to the air inlet of the burner housing, and the output end of the gas input pipe is coaxially arranged with the air inlet of the burner housing and extends to the mixed gas chamber Inside, a micro-channel rectifier is provided at the output end of the gas input pipe, and a regulating valve for adjusting the gas flow is provided on the gas input pipe; the combustion head includes a main frame and at least one stable combustion isolation zone, which divides the interior of the main frame into at least two ventilation areas along the direction of the gas channel, and each ventilation area is provided with a number of partitioning mechanisms, which divide the ventilation area into a number of nozzles, which are used to pass a mixture of gas and air and enhance the mixing effect, and the stable combustion isolation zone can separate the combustion flame on the combustion surface of the main frame into independent flames.

[0020] The beneficial effects of the present invention are as follows: a plurality of heat exchange tubes are added to the heating space of the bottom pot, and by arranging the heat exchange tubes with a unique heat structure, the burner head located at the center of the lower end of the bottom pot can directly heat the bottom of the pot and the heat exchange tubes at the same time. The use of these heat exchange tubes can not only increase the heat exchange area and improve the heating efficiency, but more importantly, it can quickly transfer heat energy to the circumferential area of ​​the bottom pot, redistribute the heat in the pot, and accelerate the generation of steam in the circumferential area, so that the time to boil a steamer of water is shortened by 5 to 10 minutes. After the water boils, the steam distribution is more uniform, which is beneficial to the consistency and flatness of the smoke from the upper steamer, which is crucial for improving the quality of wine and the wine production rate. At the same time, due to the improved heating efficiency, the amount of gas used is also saved, which has a good energy-saving effect and improves production efficiency. The connection point of the heat exchange tube is located at the periphery of the circular ring inside the bottom pot and is arranged at an angle, which is not only conducive to the steam flowing upward along the angle and reducing the scale in the heat exchange tube, but also effectively prevents the lees from falling into the heat exchange tube and reduces the risk of blockage.

[0021] In addition, the lower area of ​​the pot is made of a combination of cast-in-place concrete and an integrated reflective plate, which is sealed to form a fully enclosed stove chamber. A fan draws air from the outside into the stove chamber to ensure combustion efficiency and avoid exceeding the particulate matter standard. The reflective plate uses the mirror principle to reflect heat radiation to the bottom of the pot, redistributing the heat to achieve the effect of uniform boiling of water and uniform rising of steam in the entire pot, which is further beneficial to the consistency and flatness of the smoke penetration of the upper steamer, while further saving gas consumption.

[0022] An annular flue is arranged on the outside of the bottom pot, and the positional relationship of the flue gas inlet and outlet of the annular flue is arranged relative to the blocking block, so that the high-temperature flue gas in the furnace is forced to be discharged uniformly after circling the bottom pot. This allows the bottom pot to fully utilize the waste heat of the flue gas, produce more steam, and heat the pot more evenly, while achieving greater energy-saving effects.

[0023] The burner adopts low nitrogen burner, and the carbon monoxide emission concentration is less than 100mg / m 3 Thermal and rapid nitrogen oxides are suppressed at the same time, and the NOx emission concentration is lower than 30mg / m 3 , meeting national emission standards, while also making combustion more complete, further saving gas and achieving greater energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of the bottom pot for brewing liquor in the present invention; Figure 2 yes Figure 1 AA direction cross-sectional view; Figure 3 yes Figure 1 BB direction cross-sectional view; Figure 4This is a schematic diagram of the overall structure of the direct-fired distillation device for liquor production in the present invention (the heat exchange tubes of the bottom pot are not shown); Figure 5 yes Figure 4 A local enlarged schematic diagram of point C in FIG; Figure 6 It is a schematic diagram of the flue plane layout in the present invention; Figure 7 It is a structural schematic diagram of the burner in the present invention.

[0025] Parts marked in the figure: bottom pot 1, pot bottom 11, pot body 12, volume space 13, circular periphery 14, lower opening 15, heating space 16, wine retort docking ring groove 17, exhaust pipe 18, outer wall 19, annular bottom edge 110, heat exchange tube 111, steam inlet pipe 112, interlayer space 113, flame observation pipe 114; reflector 2; burner 3, burner housing 31, mixed gas chamber 32, nozzle 33 , gas inlet pipe 34, air inlet pipe 35, combustion head 36, micro-channel rectifier 37, fan 38, ignition mechanism 39; flue heat exchanger 4; wine retort 5, wine vapor delivery pipe 51; condensing device 6; annular flue 7, sealing block 71, support seat 81, refractory brick masonry layer 82, insulation board layer 83, reinforced concrete slab layer 84, flue wall 85, thermal insulation layer 86, burner mounting pipe 87, workshop flue 9. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 3As shown, the bottom pot for brewing white wine described in the present invention (i.e., the "bottom pot 1") includes a pot body 12 with a pot bottom 11, and the inside of the pot body 12 is a volume space 13. The edge of the pot bottom 11 is connected to a circular periphery 14 extending downward, and the circular periphery 14 and the pot bottom 11 constitute a heating space 16 with a lower opening 15; the outer periphery of the circular periphery 14 is provided with an outer wall 19 sealed with the pot body 12, and the bottom of the circular periphery 14 and the outer wall 19 are sealed with an annular bottom edge 110, and the circular periphery 14 is sealed with the pot bottom 11, and the circular periphery 14, the outer wall 19 and the annular bottom edge 110 form an interlayer space 113, and the interlayer space 113 is communicated with the volume space 13 of the pot body 12. The above-mentioned main structure can be implemented with reference to the Chinese patent document with publication number CN1318566C. The key technical point of this invention is that multiple heat exchange tubes 111 are fixedly installed on the inner wall of the circular periphery 14. The heat exchange tubes 111 are arranged in a spaced manner along the left and right directions. The axial ends of each heat exchange tube 111 are connected to the front and rear areas of the interlayer space 113 respectively. This is equivalent to providing connecting holes corresponding to the heat exchange tubes 111 on the circular periphery 14. Generally, the heat exchange tubes 111 can be connected and fixed to the circular periphery 14 by full welding, while ensuring the airtightness of the connection. The "circular periphery 14" should be understood broadly, specifically referring to a cylinder with a circular cross-section, which can be a straight cylinder or a tapered cylinder. In practice, when water is added to the volume space 13 within the pot body 12, not only is the interlayer space 113 pre-filled with water, but the heat exchange tubes 111 are also filled with water. When heating is performed using the burner head 37 in the lower center of the heating space 16, the pot bottom 11 and the heat exchange tubes 111 can be directly heated simultaneously. Using these heat exchange tubes 111 not only increases the heat exchange area and improves heating efficiency, but more importantly, it can quickly transfer heat energy to the circumferential area of ​​the bottom pot 1, redistributing the heat within the pot and accelerating steam generation in the circumferential area, shortening the time it takes to boil a steamer. Furthermore, after the water boils, the steam distribution is more uniform, which is beneficial to the consistency and smoothness of the smoke from the upper steamer, which is crucial for improving wine quality and wine production. At the same time, due to the improved heating efficiency, gas consumption is also saved, achieving a good energy-saving effect and improving production efficiency.

[0028] It is understandable that by adding multiple heat exchange tubes 111 extending horizontally or obliquely in the front-to-back direction to the heating pot of the bottom pot, the heating efficiency and heating uniformity can be improved to a certain extent, while also achieving energy saving. In order to further enhance the technical effect of the above-mentioned heat exchange tubes 111, the preferred arrangement is that the axis of each heat exchange tube 111 is arranged obliquely along the front-to-back direction, and the heat exchange tubes 111 are composed of a first heat exchange tube and a second heat exchange tube arranged in a staggered manner, the front end of the first heat exchange tube being lower than the rear end, the front end of the second heat exchange tube being higher than the rear end, and the front end of the second heat exchange tube being at the same height as the rear end of the first heat exchange tube, and the rear end of the second heat exchange tube being at the same height as the front end of the first heat exchange tube; the multiple heat exchange tubes 111 are evenly spaced in the left-right direction; the interlayer space 113 is connected to the volume space 13 of the pot body 12 through an annular cavity (the outer wall 19 and the outer peripheral wall of the pot body 12 can generally be a cylindrical body with an integral structure). Since the connection point of the heat exchange tube 111 is located at the circular periphery 14 inside the bottom pot 1 and is arranged at an angle, it is not only beneficial for the steam to flow upward along the angle to reduce scale in the heat exchange tube 111, but also can effectively prevent the lees from falling into the heat exchange tube 111, reducing the risk of blockage.

[0029] Parameters such as the number, dimensions, and inclination angle of the heat exchange tubes 111 can be appropriately set based on actual conditions. A preferred arrangement for the inclination angle is one in which the axis of the heat exchange tubes 111 is angled at 5° to 15° relative to the horizontal plane. In the preferred embodiment illustrated in the accompanying drawings, the angle of the axis of the heat exchange tubes 111 relative to the horizontal plane is 10°. There are 14 heat exchange tubes 111, each with an outer diameter of 45 mm. The horizontal spacing between the central axes of the heat exchange tubes 111 is 85 mm. Under the same experimental parameter conditions, compared with the applicant's prior patent application scheme (Chinese patent document with publication number CN1318566C), by simply replacing the bottom pot and adding the above-mentioned 14 heat exchange tubes 111, after comparative tests, the scheme of the present invention shortens the time for boiling a steamer of water by 5 minutes to 10 minutes, and the steam distribution after the water boils is more uniform, which is beneficial to the consistency and flatness of the smoke penetration of the upper steamer; during distillation production, a single steamer (the weight of the raw material in the mother tank is 0.9t to 0.95t) can save about 3m³ of gas consumption.

[0030] In order to facilitate the observation of the flame size and facilitate the automatic control of the burner 3, the present invention also fixes a flame observation pipe 114 on the outer wall 19 of the bottom pot 1 and the circular periphery 14, and a flame detector is provided in the flame observation pipe 114. The flame detector is an existing complete set of components, and its specific installation structure is common knowledge. The flame detector is an important equipment in the furnace safety monitoring system. Its function is to detect the combustion conditions in real time according to the combustion characteristics of the flame. Once the flame combustion state does not meet the normal conditions or the flame is extinguished, a signal is given in a certain way to ensure that the fuel supply is stopped when the furnace fire is extinguished, so as to prevent the accumulation of fuel in the furnace and the occurrence of abnormal conditions that are ignited and cause a serious accident of furnace explosion. After the flame detector is installed, the interior of the flame observation pipe 114 is a sealed structure, and no smoke will be discharged. The smoke can only be discharged through the exhaust pipe 18.

[0031] Other structures of the pot 1 can be implemented with reference to existing technologies. For example, to further improve the thermal efficiency of gas combustion heating, the angle between the annular periphery 14 and the pot bottom 11 is acute (equivalent to the annular periphery 14 being an inverted tapered cylinder), typically 80° to 85°. This allows the upward reflection of the annular periphery 14 to reflect some radiant heat back toward the pot bottom 11, further increasing the temperature within the heating space 16 and thus more effectively utilizing thermal energy. The pot 1 can be made of materials such as stainless steel, aluminum, and copper. The pot bottom 11 can have a flat bottom or a spherical arc-shaped structure.

[0032] A drain pipe is provided at the bottom of the interlayer space 113. The drain pipe is in communication with the interlayer space 113 and can be used to discharge excess water and bottom sewage, or to replace the water in the pot.

[0033] A steam inlet pipe 112 is connected to the bottom of the pot body 12, near the pot base 11. The steam introduced into this pipe can be generated using waste heat or an existing steam source, making the pot 1 suitable for a variety of applications. In a preferred embodiment, the steam introduced into the pipe 112 is generated using waste heat. For details, please refer to the direct-fired distillation apparatus for liquor production described below.

[0034] An exhaust duct 18 is fixedly mounted on the outer wall 19 and the annular periphery 14. The exhaust duct 18 connects the heating space 16 with the space outside the outer wall 19. The exhaust duct 18 is used to discharge the exhaust gas after combustion, which not only facilitates the use of residual heat, but also reduces environmental pollution by centrally treating the exhaust gas, thereby achieving the purpose of comprehensive utilization.

[0035] Correspondingly, the present invention also provides a direct-fired distillation device for producing liquor. Figures 4 to 7The direct-fired distillation device for producing liquor comprises a bottom pot 1 and a burner 3, the burner 3 is used for heating the bottom pot 1, and the bottom pot 1 is fixedly mounted on the equipment base; the bottom pot 1 adopts the specific structure of the various embodiments described above, the equipment base comprises a support seat 81, the top surface of the support seat 81 is used for supporting the annular bottom edge 110 of the fixed bottom pot 1, the lower opening of the heating space 16 of the bottom pot 1 is provided with a reflecting plate 2, the reflecting plate 2 is used for reflecting the radiant heat at the reflecting plate 2 back to the bottom 11 of the pot, the reflecting plate 2 is an integrated structure in the shape of an inverted cone, and is coaxially arranged with the circular periphery 14 of the bottom pot 1, the outer peripheral edge of the reflecting plate 2 forms a closed connection with the lower end of the inner peripheral surface of the circular periphery 14 of the bottom pot 1, the center position of the reflecting plate 2 is a mounting hole, and the burner 3 is fixedly mounted in the mounting hole, the burner 3 The burner comprises a burner housing 31 having a mixed gas chamber 32 and a plurality of nozzles 33 facing the bottom 11 of the pot 1. The burner housing 31 is provided with a gas inlet pipe 34 and an air inlet pipe 35 communicating with the mixed gas chamber 32. The burner housing 31 is equipped with an ignition mechanism 39 for igniting the mixture of gas and air ejected from the nozzles 33. One end of the nozzle 33 of the burner housing 31 extends out of the upper end surface of the mounting hole of the reflector 2. It is understood that the reflector 2 is used to reflect radiant heat from the reflector 2 back to the bottom 11 of the pot. To ensure reflection efficiency, its upper surface should have a certain degree of smoothness to form a mirror effect. The cone angle of the reflector 2 can be reasonably designed according to actual conditions. In the embodiment shown in the accompanying drawings, the angle formed by the outer edge of the upper surface of the reflector 2 relative to the horizontal direction is 2°. In this basic scheme, the main structure of the present invention can be implemented with reference to the applicant's prior patent application scheme (Chinese patent document with publication number CN1304551C). The key technical point is the installation of the above-mentioned redesigned bottom pot 1, and the clear definition of the burner 3 with its own gas and air mixing input system. The reflector 2 is an integrated inverted conical structure and no longer has a splicing gap, so as to fully ensure the airtightness of the main structure of the furnace, thereby further improving the heating efficiency and optimizing the workshop production environment.

[0036] In order to further improve the heating efficiency and the uniformity of steam rising, the top surface of the support seat 81 in the present invention is fixedly provided with a flue wall 85 in the peripheral area of ​​the outer wall 19 of the bottom pot 1. The outer wall 19 of the bottom pot 1, the flue wall 85 and the top surface of the support seat 81 are combined to form a closed annular flue 7. The annular flue 7 has a sealing block 71, and the sealing block 71 completely closes the radial flow section of the annular flue 7; the annular flue 7 is provided with a flue gas inlet on one side of the sealing block 71 and a flue gas outlet on the other side of the sealing block 71. The flue gas inlet and the flue gas outlet of the annular flue 7 are both arranged near the sealing block 71. The flue gas inlet is arranged on the outer wall 19 of the bottom pot 1 and is connected to the heating space 16 of the bottom pot 1 through the exhaust pipe 18. The smoke outlet is arranged on the flue wall 85 and is connected to the workshop flue 9. After adopting the above structural design, the high-temperature flue gas in the furnace can be forced to be discharged uniformly after circulating around the bottom pot 1, so that the bottom pot 1 can fully utilize the waste heat of the flue gas, produce more steam, heat the pot more evenly, and at the same time achieve greater energy-saving effects.

[0037] In order to further facilitate the utilization of flue gas waste heat, the present invention sequentially stacks a refractory brick masonry layer 82, a heat-insulating plate layer 83 and a reinforced concrete plate layer 84 on the lower surface of the reflector 2. The lower surface of the reflector 2 is in contact with the refractory brick masonry layer 82 (the refractory brick masonry layer 82 includes a plastering leveling layer), and the reinforced concrete plate layer 84 and the support seat 81 are an integrated structure; a burner mounting pipe 87 is embedded and fixed in the reinforced concrete plate layer 84, and the burner mounting pipe 87 extends vertically downward from the lower surface of the reinforced concrete plate layer 84, and the burner The lower end of the burner mounting tube 87 has a first connecting flange, and the outer surface of the burner housing 31 has a second connecting flange. A sealing gasket is provided between the first connecting flange and the second connecting flange, and is fixed by bolts. A thermal insulation layer 86 arranged around the circumference of the annular flue 7 is preset in the flue wall 85. The thermal insulation layer 86 includes a vertical section of the thermal insulation layer and a horizontal section of the thermal insulation layer fixed as one. The horizontal section of the thermal insulation layer is located at the top of the vertical section of the thermal insulation layer and extends toward the direction close to the bottom pot 1.

[0038] Comparative tests have shown that, under the same experimental conditions, only considering the energy-saving effects of the above-mentioned annular flue 7, blocking block 71, reflector 2, refractory brick masonry layer 82, insulation board layer 83, reinforced concrete board layer 84, and thermal insulation layer 86, can save about 5m³ / steamer of gas. As mentioned above, the weight of the raw material of the mother mash of a single steamer is generally 0.9t to 0.95t. The furnace structure and flue layout of the comparative test example are implemented using the Chinese patent document with publication number CN1304551C. The reflector is composed of three groups of 120° fan-shaped reflective units spliced ​​along the circumference of the reflector. The reflective unit is composed of at least two reflective segments overlapped along the radial direction of the reflector. An air inlet gap is left between the overlapping portions of the reflective segments at the overlap. The heating space has three evenly distributed exhaust ports to connect to the flue.

[0039] In order to further utilize the waste heat of cooling water generated by the condensing device 6 and the waste heat of flue gas generated by the bottom pot 1, the present invention further includes a wine retort 5 and a condensing device 6. The wine retort 5 is fixedly mounted on the top of the bottom pot 1; the top of the wine retort 5 is connected to the inlet of the condenser in the condensing device 6 through the wine vapor delivery pipe 51. The condensing device 6 has a cooling water inlet pipe and a cooling water outlet pipe. The bottom of the pot body 12 is connected to a steam inlet pipe 112 near the bottom of the pot 11; a flue is provided in the workshop flue 9 at a position near the flue gas outlet of the annular flue 7. Heat exchanger 4, flue heat exchanger 4 has a water vapor pipeline and a flue gas exhaust pipeline that can exchange heat with each other. The water vapor pipeline has a water inlet end and a steam output end. The inlet of the flue gas exhaust pipeline of the flue heat exchanger 4 is connected to the end of the workshop flue 9 close to the flue gas outlet of the annular flue 7, and the outlet of the flue gas exhaust pipeline is connected to the end of the workshop flue 9 away from the flue gas outlet of the annular flue 7. The water inlet end of the flue heat exchanger 4 is connected to the cooling water outlet pipe of the condensing device 6, and the steam output end is connected to the inlet end of the steam inlet pipe 112 of the bottom pot 1. In the above scheme, the flue gas waste heat is first reused through the annular flue 7, and then the flue gas waste heat is reused again through the flue heat exchanger 4, effectively improving the energy saving effect. The main structures of the flue heat exchanger 4, the wine steamer 5 and the condensing device 6 can be implemented with reference to the existing technology, such as the Chinese patent document with publication number CN1304551C.

[0040] In a preferred embodiment, the specific structure of the burner 3 of the present invention is as follows: the burner 3 also includes a fan 38 for matching and connecting with the air input pipe 35; the burner housing 31 includes a circular cylindrical body with a vertical axis; the lower end of the circular cylindrical body is an air inlet and the upper end is an air outlet; a combustion head 36 is fixedly installed in the air outlet of the burner housing 31; the area between the air inlet of the burner housing 31 and the input end of the combustion head 36 constitutes a mixed gas chamber 32; the air input pipe 35 is connected to the outlet end of the fan 38; the outlet end of the air input pipe 35 is connected to the air inlet of the burner housing 31; the output end of the gas input pipe 34 is connected to the burner housing The air inlet of the body 31 is coaxially arranged and extends into the mixed gas chamber 32. The output end of the gas inlet pipe 34 is provided with a micro-channel rectifier 37, and the gas inlet pipe 34 is provided with a regulating valve for adjusting the gas flow. The burner head 36 includes a main frame and at least one stable combustion isolation zone. The stable combustion isolation zone divides the interior of the main frame into at least two ventilation areas along the gas passage direction. Each ventilation area is provided with a plurality of partitioning mechanisms. The partitioning mechanisms divide the ventilation area into a plurality of nozzles 33. The nozzles 33 are used to pass the mixture of gas and air and enhance the mixing effect. The stable combustion isolation zone can separate the combustion flame on the combustion surface of the main frame into independent flames. The specific structure and process principles of the micro-channel rectifier 37 and the burner head 36 can be found in the Chinese patent publication No. CN214249581U. A fan 38 provides the air required for combustion, a regulating valve controls the on / off flow and gas flow rate, and a micropore rectifier 37 distributes the gas uniformly across the air passage cross-section, ensuring thorough and uniform mixing of the gas and air within the mixed gas chamber 32. Through the specially constructed burner head 36, the gas and air are highly evenly mixed upon entering the nozzle holes 33 (micropore structure). Upon exiting the nozzle holes 33, they ignite to form a uniform premixed flame. The provision of a stable combustion isolation zone isolates the flames from one another, resulting in a pyramid-like shape (a hollow cone-shaped flame surface). This creates a stable flame and effectively prevents erratic continuous flames, ensuring stable combustion. The micropore structure has a high pore density and a limited pore size. The confined space within the small pores acts as a rectifier, ensuring excellent mixing of the gas and air. This results in very low CO and NOx emissions, resulting in clean and efficient combustion. Furthermore, the small pores provide a flashback protection function, ensuring safe combustion. The regulating valve can also typically be an electric valve, controlled in conjunction with the flame detector described above. Comparative tests have shown that, under the same experimental conditions, by simply replacing the burner 3, the present invention not only achieves a carbon monoxide emission concentration of less than 100 mg / m 3 , NOx emission concentration is lower than 30mg / m 3, meeting national emission standards while also ensuring more complete combustion, further conserving gas and achieving greater energy savings, potentially saving 3m³ / steamer. The burner structure used in the comparative test example is the solution in Chinese patent publication CN1304551C. The burner housing has a chamber connected to the gas inlet pipe and several spray holes facing the bottom of the pot. An air inlet pipe is provided on the housing, connecting to the chamber. The gas and air inlet pipes are coaxial and located within the air inlet pipe.

[0041] Compared to the solution in Chinese patent publication CN1304551C (referred to as "Comparative Example 1" in Tables 1 and 2), the present invention, by comprehensively implementing the above technical measures, significantly reduces energy consumption during the liquor distillation process, improves production efficiency, and simultaneously achieves more uniform vapor distribution, facilitating consistent and smooth smoke flow in the upper retort, which is crucial for improving liquor quality and yield. Exhaust emissions also meet national emission standards. Relevant production data is compared below:

[0042] After the solution of the present invention was implemented, the team with the most outstanding energy-saving effect saw the average daily gas consumption of a single steamer drop from 28.4m³ to 18.3m³, a reduction of 10.1m³, and an energy-saving effect of 35.6%, achieving the goal of energy conservation and emission reduction while also saving gas costs.

[0043] In addition, the present invention also conducted comparative tests on the above preferred embodiment and a bottom pot solution using a "multiple vertical heating tubes + horizontal combustion rod" heating method (hereinafter referred to as Comparative Example 2). The relevant production data are as follows:

Claims

1. A bottom pot for brewing liquor, comprising a pot body (12) with a pot bottom (11), a volume space (13) within the pot body (12), an edge of the pot bottom (11) connected to a circular periphery (14) extending downward, the circular periphery (14) and the pot bottom (11) forming a heating space (16) with a lower opening (15); an outer wall (19) sealedly connected to the pot body (12) is provided on the outer periphery of the circular periphery (14), an annular bottom edge (110) is sealedly connected to the bottom of the circular periphery (14) and the outer wall (19), the circular periphery (14) is sealedly connected to the pot bottom (11), the circular periphery (14), the outer wall (19) and the annular bottom edge (110) form an interlayer space (113), and the interlayer space (113) is communicated with the volume space (13) of the pot body (12); characterized in that, A plurality of heat exchange tubes (111) are fixedly provided on the inner peripheral wall of the annular periphery (14), and the heat exchange tubes (111) are arranged at intervals in the left-right direction, and the axial ends of each heat exchange tube (111) are respectively connected to the front side area and the rear side area of ​​the interlayer space (113).

2. The bottom pot for brewing liquor according to claim 1, characterized in that: The axis of each heat exchange tube (111) is arranged to extend obliquely along the front-to-back direction. The heat exchange tube (111) is composed of a first heat exchange tube and a second heat exchange tube arranged in a staggered manner. The front end of the first heat exchange tube is lower than the rear end, the front end of the second heat exchange tube is higher than the rear end, and the front end of the second heat exchange tube is at the same height as the rear end of the first heat exchange tube, while the rear end of the second heat exchange tube is at the same height as the front end of the first heat exchange tube. The plurality of heat exchange tubes (111) are evenly spaced in the left-right direction. The interlayer space (113) is connected to the volume space (13) of the pot body (12) through an annular cavity.

3. The bottom pot for brewing liquor according to claim 2, characterized in that: The included angle of the axis of the heat exchange tube (111) relative to the horizontal plane is 5° to 15°.

4. The bottom pot for brewing liquor according to claim 1, characterized in that: The angle between the annular periphery (14) and the pot bottom (11) is an acute angle.

5. The bottom pot for brewing liquor according to any one of claims 1 to 4, characterized in that: A sewage pipe is provided at the bottom of the interlayer space (113), and a steam inlet pipe (112) is connected to the bottom of the pot body (12) near the pot bottom (11); an exhaust pipe (18) is fixedly provided on the outer wall (19) and the annular periphery (14), and the exhaust pipe (18) communicates with the heating space (16) and the outer space of the outer wall (19); a flame observation pipe (114) is fixedly provided on the outer wall (19) and the annular periphery (14), and a flame detector is provided in the flame observation pipe (114).

6. A direct-fired distillation device for producing liquor, comprising a bottom pot (1) and a burner (3), wherein the burner (3) is used to heat the bottom pot (1), and the bottom pot (1) is fixedly installed on the equipment base; characterized in that: The bottom pot (1) adopts the bottom pot for brewing liquor as described in any one of claims 1 to 4, and the equipment base includes a support base (81), the top surface of the support base (81) is used to support the annular bottom edge (110) of the fixed bottom pot (1), and the lower opening of the heating space (16) of the bottom pot (1) is equipped with a reflector (2), and the reflector (2) is used to reflect the radiant heat at the reflector (2) back to the bottom of the pot (11), and the reflector (2) is an inverted conical integrated structure and is coaxially arranged with the circular periphery (14) of the bottom pot (1), and the outer peripheral edge of the reflector (2) forms a closed connection with the lower end of the inner peripheral surface of the circular periphery (14) of the bottom pot (1), and the reflector The center position of (2) is a mounting hole, and a burner (3) is fixedly mounted in the mounting hole. The burner (3) includes a burner shell (31). The burner shell (31) has a mixed gas chamber (32) and a plurality of spray holes (33) facing the bottom (11) of the bottom pot (1). The burner shell (31) is provided with a gas input pipe (34) and an air input pipe (35) communicating with the mixed gas chamber (32). The burner shell (31) is equipped with an ignition mechanism (39) for igniting a mixed gas of gas and air sprayed from the spray hole (33). The burner shell (31) has one end of the spray hole (33) extending out of the upper end surface of the mounting hole of the reflector (2).

7. The direct-fired distillation device for producing liquor according to claim 6, characterized in that: The top surface of the support seat (81) is fixedly provided with a flue wall (85) in the peripheral area of ​​the outer wall (19) of the bottom pot (1). The outer wall (19) of the bottom pot (1), the flue wall (85) and the top surface of the support seat (81) are combined to form a closed annular flue (7). A blocking block (71) is provided in the annular flue (7). The blocking block (71) completely blocks the radial flow section of the annular flue (7). The annular flue (7) is provided with a flue gas inlet on one side of the blocking block (71) and a flue gas outlet on the other side of the blocking block (71). The flue gas inlet and the flue gas outlet of the annular flue (7) are both provided at positions close to the blocking block (71). The flue gas inlet is provided on the outer wall (19) of the bottom pot (1) and is connected to the heating space (16) of the bottom pot (1) through the exhaust pipe (18). The flue gas outlet is provided on the flue wall (85) and is connected to the workshop flue (9).

8. The direct-fired distillation device for producing liquor according to claim 7, characterized in that: A refractory brick masonry layer (82), a heat-insulating plate layer (83) and a reinforced concrete plate layer (84) are sequentially stacked on the lower surface of the reflector (2), the lower surface of the reflector (2) is in contact with the refractory brick masonry layer (82), and the reinforced concrete plate layer (84) and the support seat (81) are an integrated structure; a burner mounting pipe (87) is embedded and fixed in the reinforced concrete plate layer (84), and the burner mounting pipe (87) extends vertically downward from the lower surface of the reinforced concrete plate layer (84); the lower end of the burner mounting pipe (87) has a first connecting flange, and the outer surface of the burner housing (31) has a second connecting flange, and a sealing gasket is provided between the first connecting flange and the second connecting flange, and is fixed by bolt connection; A thermal insulation layer (86) is preset in the flue wall (85) and is arranged in the outer circumferential direction of the annular flue (7). The thermal insulation layer (86) includes a vertical thermal insulation layer section and a horizontal thermal insulation layer section fixed as one. The horizontal thermal insulation layer section is located at the top of the vertical thermal insulation layer section and extends toward the bottom pot (1).

9. The direct-fired distillation device for producing liquor according to claim 7, characterized in that: The invention comprises a wine retort (5) and a condensing device (6), wherein the wine retort (5) is fixedly mounted on the top of the bottom pot (1); the top of the wine retort (5) is connected to the inlet of the condenser in the condensing device (6) through a wine vapor delivery pipe (51); the condensing device (6) has a cooling water inlet pipe and a cooling water outlet pipe, and the bottom of the pot body (12) near the pot bottom (11) is connected to a steam inlet pipe (112); A flue heat exchanger (4) is provided in the workshop flue (9) at a position close to the flue gas outlet of the annular flue (7). The flue heat exchanger (4) has a water vapor pipeline and a flue gas discharge pipeline capable of exchanging heat with each other. The water vapor pipeline has a water inlet end and a steam output end. The inlet of the flue gas discharge pipeline of the flue heat exchanger (4) is connected to one end of the workshop flue (9) close to the flue gas outlet of the annular flue (7), and the outlet of the flue gas discharge pipeline is connected to one end of the workshop flue (9) away from the flue gas outlet of the annular flue (7). The water inlet end of the flue heat exchanger (4) is connected to the cooling water outlet pipe of the condensing device (6), and the steam output end is connected to the inlet end of the steam inlet pipe (112) of the bottom pot (1).

10. The direct-fired distillation device for producing liquor according to any one of claims 6 to 9, characterized in that: The burner (3) includes a fan (38), and the burner housing (31) includes a circular cylindrical body with an axis vertically arranged. The lower end of the circular cylindrical body is an air inlet and the upper end is an air outlet. A combustion head (36) is fixedly installed in the air outlet of the burner housing (31). The area between the air inlet of the burner housing (31) and the input end of the combustion head (36) constitutes a mixed gas chamber (32). The air input pipe (35) is connected to the outlet end of the fan (38), and the outlet end of the air input pipe (35) is connected to the air inlet of the burner housing (31). The output end of the gas input pipe (34) is coaxially arranged with the air inlet of the burner housing (31) and The combustion head (36) extends into the mixed gas chamber (32), and a micro-channel rectifier (37) is provided at the output end of the gas input pipe (34), and a regulating valve for regulating the gas flow is provided on the gas input pipe (34); the combustion head (36) includes a main frame and at least one stable combustion isolation zone, the stable combustion isolation zone divides the interior of the main frame into at least two ventilation areas along the gas channel direction, and each ventilation area is provided with a plurality of partitioning mechanisms, and the partitioning mechanisms divide the ventilation area into a plurality of nozzles (33), and the nozzles (33) are used to pass the mixture of gas and air and enhance the mixing effect, and the stable combustion isolation zone can separate the combustion flame on the combustion surface of the main frame into independent flames.

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