A drawable shell indirect heating furnace

Abstract

An embodiment of the present invention provides a retractable shell indirect heating furnace, which includes a furnace body, a water injection pipe provided on the furnace body, a combustion heating component, and a heat exchange pipe. A flue is provided on one side of the heat exchange pipe; the combustion heating component includes a burner base, a fire tube communicated with the burner base, a smoke return chamber respectively communicated with the fire tube and the flue, and a plurality of inclined smoke pipes connected between the fire tube and the smoke return chamber; a plurality of independent cavities are provided inside the smoke pipes, and a smoke pipe plugging mechanism is installed in the smoke return chamber. The smoke pipe plugging mechanism is used to selectively plug some cavities to adjust the flue gas pressure and humidity inside the smoke pipes. By arranging the smoke pipes obliquely inside the furnace body, the condensed liquid water can be introduced into the smoke return chamber, avoiding the corrosion and damage of the smoke pipes caused by the accumulation of liquid water inside the smoke pipes. By arranging the smoke pipes to have a plurality of independent cavities and using the smoke pipe plugging mechanism to plug the cavities inside the smoke pipes, the air pressure inside the smoke pipes can be increased and the humidity of the flue gas inside the smoke pipes can be reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of shell indirect heating furnaces, and particularly to a drawable shell indirect heating furnace. Background Art

[0002] A water jacket heating furnace is a device commonly used for heating fluids. Its heating principle is to use an external heat source (usually a flame or an electric heater) to transfer heat to the fluid inside the furnace through the outer wall of the furnace body. The outer wall of the furnace body is usually wrapped with a shell indirect (i.e., a water wall). When the external heat source heats the furnace body, the water in the shell indirect is heated and generates steam or hot water, achieving the heating effect through natural convection.

[0003] Currently, existing shell indirect heating furnaces, such as an environmentally friendly and energy-saving oilfield water jacket heating furnace with the publication number of CN111854474B in the prior art and a condensing horizontal water jacket heating furnace with the publication number of CN103542524A, both achieve heat exchange through coiled pipes, and the coiled pipes are connected to the furnace body in a fixed manner. As a result, when the heat exchange efficiency is affected due to fouling of the coiled pipes, the staff can only remove the coiled pipes by cutting through the furnace body, which causes relatively serious damage to the furnace body and easily affects the service life of the water jacket heating furnace.

[0004] In addition, the combustion medium of existing shell indirect heating furnaces mostly selects clean energy - natural gas. Although the products after natural gas combustion have little impact on the environment, the products after natural gas combustion contain H2O. The H2O mixed in the flue gas is likely to cause water vapor condensation in the flue of existing shell indirect heating furnaces, forming liquid water. Since the flue pipes in an environmentally friendly and energy-saving oilfield water jacket heating furnace with the publication number of CN111854474B and a condensing horizontal water jacket heating furnace with the publication number of CN103542524A in the prior art are all horizontally arranged, the precipitated liquid water is easily accumulated inside the flue pipes, causing corrosion to the inner wall of the flue pipes under high temperature and high pressure conditions, further affecting the service life of the shell indirect heating furnace. Moreover, if the H2O mixed in the flue gas does not turn into liquid water, it will increase the humidity in the flue. The increase in humidity will lead to an increase in heat loss inside the shell indirect heating furnace and may also promote the corrosion process inside the equipment, causing damage to the shell indirect heating furnace. Summary of the Invention

[0005] The embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art, and provide a drawable shell indirect heating furnace.

[0006] An embodiment of the present invention provides a retractable shell indirect heating furnace, which includes a furnace body, a water injection pipe arranged at the top of the furnace body, a combustion heating component arranged at the bottom end inside the furnace body, and a heat exchange pipe detachably arranged on top of the combustion heating component. A flue for discharging the flue gas in the combustion heating component is arranged on one side of the heat exchange pipe;

[0007] The combustion heating component includes a burner base, a fire tube communicated with the burner base, a smoke return chamber communicated with the fire tube and the flue respectively, and a plurality of inclined smoke tubes connected between the fire tube and the smoke return chamber;

[0008] A plurality of independent cavities are arranged inside the smoke tube, and a smoke tube plugging mechanism is installed in the smoke return chamber. The smoke tube plugging mechanism is used to selectively plug some cavities to adjust the flue gas pressure and humidity in the smoke tube.

[0009] In some possible embodiments, the smoke tube plugging mechanism includes multiple groups of plugs, a connecting frame, a moving plate, a reciprocating lead screw, and a driving component; the number of plugs is the same as the number of cavities of the smoke tube. Each group of plugs correspondingly plugs a cavity of a smoke tube, and multiple groups of plugs are arranged horizontally along the smoke return chamber;

[0010] Each group of plugs is fixed through a connecting frame. The bottom of the connecting frame is connected to the moving plate. The moving plate is in threaded cooperation with the reciprocating lead screw, and the driving component is in transmission connection with the reciprocating lead screw to drive the plugs to move along the smoke return chamber.

[0011] In some possible embodiments, the lengths of the moving plates at the bottom ends of multiple groups of plugs decrease in order from left to right, and the reciprocating lead screws at the bottom ends of multiple groups of plugs distributed in order from left to right are distributed inside the smoke return chamber in order from bottom to top.

[0012] In some possible embodiments, the heat exchange pipe includes multiple heat exchange coils, a fixed bracket, a coil installation flange, an inlet pipe, an outlet pipe, and a coil connection bracket;

[0013] Multiple heat exchange coils are fixed together through the coil connection bracket. The fixed bracket is arranged at the bottom of the coil connection bracket, and the fixed bracket is fixed to the inner wall of the furnace body;

[0014] The inlet end and the outlet end of the heat exchange coil both extend out from the side of the furnace body away from the flue. A coil installation flange is detachably connected to the side of the furnace body away from the flue, and the inlet end and the outlet end of the heat exchange coil are both fixed to the coil installation flange;

[0015] The inlet ends and the outlet ends of multiple heat exchange coils are respectively communicated with the inlet pipe and the outlet pipe, and the inlet pipe and the outlet pipe are both located on one side of the furnace body.

[0016] In some possible embodiments, the smoke return chamber includes a cylinder, side plates of the smoke return chamber, and a top plate of the smoke return chamber;

[0017] The top plate of the smoke return chamber is fixed to the top of the side plates of the smoke return chamber, and both the side plates and the top plate of the smoke return chamber are fixed to the inner wall of the furnace body;

[0018] The smoke pipe penetrates through the side plate of the smoke return chamber on the left side, the cylinder penetrates through the side plate of the smoke return chamber on the right side, the space between the inside of the cylinder and the side plate of the smoke return chamber is connected, one end of the cylinder extends out from one side of the furnace body, the port of the cylinder is sealed by a flange, and protective plates fixedly connected to the inner wall of the furnace body are fixed on both the front side and the rear side of the cylinder.

[0019] In some possible embodiments, the fire tube includes two round tubes and a threaded tube, and the threaded tube is fixed between the two round tubes; wherein,

[0020] One end of the round tube on the left side of the threaded tube, which is far from the threaded tube, is communicated with the inside of the burner base; and,

[0021] One end of the round tube on the right side of the threaded tube, which is far from the threaded tube, is communicated with the inside of the smoke return chamber.

[0022] In some possible embodiments, a short flue is fixed to one end of the top of the furnace body, and the short flue is communicated with the inside of the flue; a condensation assembly is fixed inside the flue, and the condensation assembly is located above the smoke pipe;

[0023] The condensation assembly includes a heat conduction plate and condensation tubes located inside the heat conduction plate. There are gaps between both ends of the heat conduction plate and the inner wall of the flue. Both ends of the condensation tubes penetrate through the heat conduction plate and the rear wall of the furnace body, so that the flue gas discharged from the smoke pipe first flows along the bottom wall of the heat conduction plate to both ends, and then rises to the top through the gaps between the heat conduction plate and the inner wall of the flue, and finally is discharged through the short flue.

[0024] In some possible embodiments, drain pipes are communicated among the bottom end of the flue, the bottom end of the smoke return chamber, and the bottom end of the furnace body.

[0025] In some possible embodiments, a manhole is fixed to the front side of the furnace body, a thermal resistance connector sleeve is provided on one side of the bottom of the manhole, and the end of the furnace body with the flue is connected to the wall panel.

[0026] In some possible embodiments, a chassis is provided at the bottom of the furnace body, and the bottom of the furnace body is separated from the ground through the chassis.

[0027] In the extractable shell indirect heating furnace according to the embodiment of the present invention, by arranging the flue pipes obliquely inside the furnace body, the condensed liquid water is introduced into the smoke return chamber by using the inclination of the flue pipes themselves, so as to avoid the corrosion and damage of the flue pipes caused by the accumulation of liquid water inside the flue pipes. In addition, by arranging the flue pipes in the form of having multiple independent cavities, the internal cavities of the flue pipes are blocked by means of a flue pipe blocking mechanism to increase the air pressure inside the flue pipes. The higher the air pressure, the higher the dew point of the condensed liquid water, making it easier for H2O mixed in the flue gas to become liquid water, so as to reduce the humidity of the flue gas inside the flue pipes and avoid excessive humidity from affecting the heat exchange efficiency. Finally, the heat exchange coil is detachably installed inside the furnace body through the coil installation flange, so as to facilitate the removal of the heat exchange coil at any time for maintenance and replacement, reduce the operation difficulty of replacing and repairing the coil of the traditional shell indirect heating furnace, and at the same time will not cause damage to the furnace body, killing two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of the overall structure of the extractable shell indirect heating furnace according to the embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the inlet pipe, outlet pipe and furnace body according to the embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the coil inside the furnace body according to the embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the condensation component inside the flue according to the embodiment of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the flue pipe inside the furnace body according to the embodiment of the present invention;

[0034] Figure 6 For the present invention Figure 5 Enlarged view of part A;

[0035] Figure 7 It is a schematic diagram of the structure of the flue pipe, flue, smoke return chamber and fire tube according to the embodiment of the present invention;

[0036] Figure 8 It is a schematic diagram of the structure of the flue pipe and the plug according to the embodiment of the present invention;

[0037] Figure 9 Explosion view of the flue pipe and three plugs according to an embodiment of the present invention;

[0038] Figure 10 Schematic structural diagram of three plugs according to an embodiment of the present invention.

[0039] Reference numerals are:

[0040] 1. Furnace body; 2. Combustion heating assembly; 3. Flue; 4. Heat exchange assembly; 5. Drain pipe; 6. Flue short section; 7. Condensation assembly; 8. Wall panel; 9. Thermoresistance joint sleeve; 10. Manhole; 11. Water injection pipe; 12. Chassis;

[0041] 21. Burner base; 22. Fire tube; 23. Smoke return chamber; 24. Flue pipe; 25. Flue pipe plugging mechanism;

[0042] 221. Round pipe; 222. Threaded pipe;

[0043] 231. Smoke return chamber side plate; 232. Smoke return chamber top plate; 233. Cylindrical tube;

[0044] 251. Plug; 252. Connecting frame; 253. Moving plate; 254. Reciprocating lead screw; 255. Transmission shaft; 256. Gear; 257. Driving member; 258. Protective plate;

[0045] 41. Heat exchange coil; 42. Fixed bracket; 43. Coil installation flange; 44. Inlet pipe; 45. Outlet pipe; 46. Coil connecting bracket;

[0046] 71. Heat conducting plate; 72. Condensation pipe. Detailed implementation manners

[0047] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] Unless otherwise specifically stated, the technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The use of "including" or "comprising" in the embodiments of the present invention neither limits the shapes, numbers, steps, actions, operations, components, elements, and / or their groups mentioned, nor excludes the occurrence or addition of one or more other different shapes, numbers, steps, actions, operations, components, elements, and / or their groups, or the addition of these. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity and order of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality" means two or more, unless otherwise specifically and clearly defined.

[0049] Unless otherwise specifically stated, the relative settings, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship, and technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail. In all the examples shown and discussed here, any specific other examples may have different values. It should be noted that: similar symbols and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the embodiments of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the embodiments of the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of different embodiments or examples.

[0051] Next, example embodiments of the present invention will be described in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention. It should be understood that the present invention is not limited by the example embodiments described herein.

[0052] Refer to the appended Figures 1 to 4, an embodiment of the present invention provides a drawable shell indirect heating furnace, which includes a furnace body 1 and two water injection pipes 11 arranged on the top of the furnace body 1. Water is injected into the furnace body 1 through the water injection pipes 11, and the injected water serves as a heating medium. One end of the furnace body 1 provided with a flue 3 is connected to a wall panel 8. A chassis 12 is provided at the bottom of the furnace body 1 to separate the bottom of the furnace body 1 from the ground for moisture protection. A manhole 10 is fixed on the front side of the furnace body 1, through which staff can conveniently enter the interior of the furnace body 1 for maintenance. A thermal resistance joint sleeve 9 is provided on one side of the bottom of the manhole 10 for installing a thermal resistance to improve the safety of the drawable shell indirect heating furnace in operation according to the embodiment of the present invention.

[0053] A combustion heating component 2 for burning natural gas to heat the water in the furnace body 1 is provided at the inner bottom end of the furnace body 1. A heat exchange tube 4 for heat exchange is provided at the top of the combustion heating component 2. A flue 3 for discharging the flue gas in the combustion heating component 2 is provided on one side of the heat exchange tube 4. The top end of the flue 3 communicates with the outside. A flue short joint 6 is fixed at one end of the top of the furnace body 1, and the flue short joint 6 is internally connected to the flue 3. The flue gas formed after the natural gas in the combustion heating component 2 burns will enter the interior of the flue 3 through the combustion heating component 2 and finally be discharged through the flue short joint 6. During the flow of the flue gas, the water injected into the interior of the furnace body 1 is heated by the combustion heating component 2, and then the heated water heats the liquid in the heat exchange tube 4 to achieve the effect of heat exchange.

[0054] Regarding the problems of difficult maintenance and replacement existing in the traditional heat exchange coil fixed inside the furnace body 1, the heat exchange tube 4 in the embodiment of the present invention is set as a detachable structure, such as Figure 1 shown. The heat exchange tube 4 includes a plurality of heat exchange coils 41. A fixed support 42 is provided at the bottom of the coil connection bracket 46. The fixed support 42 supports the coil connection bracket 46 and the heat exchange coils 41 from the bottom. The fixed support 42 is fixed to the inner wall of the furnace body 1. The inlet end and the outlet end of the heat exchange coil 41 both extend from the side of the furnace body 1 away from the flue 3. A coil installation flange 43 is detachably connected to the side of the furnace body 1 away from the flue 3. The inlet end and the outlet end of the heat exchange coil 41 are both fixed to the coil installation flange 43. In the embodiment of the present invention, the heat exchange coils 41 are set in a drawable form. A plurality of heat exchange coils 41 are fixed together by the coil connection bracket 46, and then the heat exchange coils 41 are sealed in the furnace body 1 by the coil installation flange 43, while sealing and waterproofing the installation location. When the heat exchange coils 41 need to be replaced or maintained, the maintenance personnel only need to remove the coil installation flange 43 from one end of the furnace body 1, and then pull out the heat exchange coils 41 and the coil connection bracket 46 as a whole from the top of the fixed support 42. The disassembly operation is relatively simple, which can reduce the operation difficulty of replacing and maintaining the heat exchange coils 41. At the same time, the detachable form can also avoid damaging the furnace body 1, which is beneficial to ensuring that the service life of the furnace body 1 is not affected;

[0055] Further, as Figure 1 and 2 shown, the inlet ends of multiple heat exchange coils 41 are connected to an inlet pipe 44, and the outlet ends of the multiple heat exchange coils 41 are connected to an outlet pipe 45. Both the inlet pipe 44 and the outlet pipe 45 are located on one side of the furnace body 1. The liquid or gas to be heated enters the interior of the heat exchange coils 41 through the inlet pipe 44, and the heated liquid and gas can both be discharged through the outlet pipe 45. The cooperation of one inlet and one outlet helps to ensure the continuous progress of the heating work.

[0056] As Figure 4 shown, a condensation assembly 7 is fixed inside the flue 3. The condensation assembly 7 is located at the top of the smoke pipe 24. The condensation assembly 7 is composed of a heat conducting plate 71 and a condensation pipe 72. The heat conducting plate 71 is arc-shaped. There are gaps between both ends of the heat conducting plate 71 and the inner wall of the flue 3. The flue gas discharged from the smoke pipe 24 flows along the bottom wall of the heat conducting plate 71 to both ends of the heat conducting plate 71, then flows through the gaps between the heat conducting plate 71 and the inner wall of the flue 3 to the top of the heat conducting plate 71, and finally is discharged through the flue short section 6. The condensation pipe 72 is in an S shape inside the heat conducting plate 71. Both ends of the condensation pipe 72 penetrate through the heat conducting plate 71 and the rear wall of the furnace body 1. To improve the utilization rate of energy, normal temperature clear water is introduced into the condensation pipe 72, and the remaining heat in the flue gas is used to heat the clear water in the condensation pipe 72. The heated water can be used by staff for daily washing, thereby improving the utilization rate of the heat energy in the flue gas. Moreover, the heat conducting plate 71 is set to be arc-shaped, which can make the flue gas flow along the arc-shaped outer wall of the heat conducting plate 71, so that the contact time between the flue gas and the heat conducting plate 71 can be prolonged, and the heat exchange efficiency of the liquid in the condensation pipe 72 can be further improved.

[0057] During the above heating process, to ensure the heat exchange efficiency, as Figures 5 to 8As shown in the figure, the combustion heating assembly 2 in the embodiment of the present invention includes a burner base 21 for installing a burner. The burner base 21 is located at one side of the inner bottom end of the furnace body 1. One end of the burner base 21 is communicated with a fire tube 22. One end of the fire tube 22 is communicated with a smoke return chamber 23. The fire tube 22 is composed of two round tubes 221 and a threaded tube 222. The threaded tube 222 is fixed between the two round tubes 221. The round tube 221 on the left side of the threaded tube 222 is communicated with the inside of the burner base 21 at the end away from the threaded tube 222. The round tube 221 on the right side of the threaded tube 222 is communicated with the inside of the smoke return chamber 23 at the end away from the threaded tube 222. Smoke tubes 24 are provided on both the front side and the rear side of the fire tube 22. One end of the smoke tube 24 is communicated with the inside of the smoke return chamber 23. The other end of the smoke tube 24 is communicated with the inside of the flue 3. The flue gas generated by the combustion of natural gas by the burner installed inside the burner base 21 will sequentially pass through the round tube 221 on the left side, the threaded tube 222, the round tube 221 on the right side, the smoke return chamber 23 and the smoke tube 24 and enter the inside of the flue 3. During the flow of the flue gas, the water in the furnace body 1 can be heated by means of the outer walls of the round tube 221, the threaded tube 222, the outer wall of the smoke return chamber 23 and the outer wall of the smoke tube 24. Moreover, through its unique threaded design, the threaded tube 222 can increase the degree of turbulence of the flue gas in the inner wall, destroy the boundary layer of the flue gas flow, and thus improve the heat exchange efficiency.

[0058] In the embodiment of the present invention, the smoke tube 24 is inclined. The high end of the smoke tube 24 is communicated with the inside of the flue 3, and the bottom end of the smoke tube 24 is communicated with the inside of the smoke return chamber 23. Through such a setting, when the H2O in the flue gas inside the smoke tube 24 condenses and precipitates into liquid water, the liquid water can flow into the inside of the smoke return chamber 23 along the inclined direction of the smoke tube 24, so as to avoid the accumulation of liquid water inside the smoke tube 24 and affect heat transfer. At the same time, it can also avoid the liquid water being ionized to corrode the smoke tube 24 and affect the service life of the drawable tube shell indirect heating furnace in the embodiment of the present invention.

[0059] In addition, because the increase in the humidity of the flue gas in the smoke tube 24 may lead to an increase in the internal heat loss of the furnace, the inside of the smoke tube 24 in the embodiment of the present invention is processed into a plurality of independent cavities. A smoke tube blocking mechanism 25 for blocking part of the cavities is installed inside the smoke return chamber 23. When only one cavity is left in the smoke tube 24 for the flue gas to flow through, the air pressure of the flue gas inside the smoke tube 24 is the largest at this time, and the dew point of the water vapor is the highest at this time. As long as the temperature of the flue gas in the smoke tube 24 is lower than this dew point, condensation and precipitation can occur to become liquid water, reducing the H2O in the flue gas, that is, reducing the humidity of the flue gas; on the contrary, when all the cavities of the smoke tube 24 can be used for the flue gas to flow through, the internal flue gas pressure of the smoke tube 24 is the smallest at this time, the dew point of the water vapor is the lowest, and the H2O in the flue gas is likely to exist in the form of gaseous molecules, resulting in an increase in the humidity of the flue gas.

[0060] It is known that an ideal flue gas humidity helps to maintain the temperature difference between the flue gas and the shell inside the furnace body 1, thereby promoting heat transfer. If the flue gas humidity is too low, this temperature difference may be reduced because there is a lack of sufficient water vapor in the flue gas to participate in the heat exchange process, resulting in a decrease in the heat exchange efficiency. Therefore, when the drawable shell indirect heating furnace of the embodiment of the present invention is actually used, it can be used in cooperation with a humidity detection instrument. The probe of the humidity detection instrument is installed inside the smoke return chamber 23 for detecting the humidity of the flue gas entering the smoke return chamber 23. By using the detected humidity data, the smoke pipe blocking mechanism 25 blocks a part of the cavity of the smoke pipe 24 to achieve the effect of adjusting the flue gas humidity, so that the drawable shell indirect heating furnace of the embodiment of the present invention can be in the best heat exchange state.

[0061] Specifically, the detailed structure for blocking the cavity inside the smoke pipe 24 is as Figures 6 to 10 shown. The smoke pipe blocking mechanism 25 includes multiple groups of plugs 251 for blocking the cavities in the smoke pipe 24. The number of plugs 251 in each group is the same as the number of smoke pipes 24. One plug 251 in each group is only used to block one cavity in the smoke pipe 24. Multiple groups of plugs 251 are distributed inside the smoke return chamber 23 in the order from left to right. The lengths of the moving plates 253 at the bottoms of multiple groups of plugs 251 decrease in the order from left to right. The reciprocating lead screws 254 at the bottoms of multiple groups of plugs 251 distributed in the order from left to right are distributed inside the smoke return chamber 23 in the order from bottom to top. Multiple plugs 251 in each group are fixed together by a connecting frame 252. The middle of the bottom end of the connecting frame 252 is fixed with a moving plate 253. A lead screw nut is installed at one end of the moving plate 253 away from the connecting frame 252. The internal thread of this lead screw nut is threadedly connected with a reciprocating lead screw 254. One end of the reciprocating lead screw 254 is drivingly connected with a driving component.

[0062] In some embodiments, the driving component includes a transmission shaft 255 fixed at one end of the reciprocating lead screw 254. One end of the transmission shaft 255 extends outside the furnace body 1 and is fixed with a gear 256. The gear 256 is driven to rotate by a driving member 257 for driving the plugs 251 to move inside the smoke return chamber 23. As Figure 6 shown, the driving member 257 can be composed of a motor and a transmission gear. Other structures capable of driving the gear 256 are also within the protection scope of the embodiment of the present invention. The embodiment of the present invention does not make further limitations here.

[0063] By controlling the operation of the driving member 257, the gear 256 can be driven to drive the transmission shaft 255 to rotate. Then, the reciprocating lead screw 254 is driven to rotate by the transmission shaft 255, so that the moving plate 253 installed at its outer end can be driven to perform linear motion, and finally drive a plurality of plugs 251 to move back and forth inside the smoke return chamber 23. When the plug 251 moves towards the smoke pipe 24, one of the cavities can be blocked. When the plug 251 moves away from the smoke pipe 24, one of the cavities can be exposed. By controlling the on-off of different numbers of cavities, the air pressure in the smoke pipe 24 can be controlled, so as to achieve the purpose of adjusting the humidity of the flue gas in the smoke pipe 24.

[0064] Moreover, to facilitate the plug 251 moving horizontally to be inserted into the smoke pipe 24, as Figure 9 and Figure 10 shown, the end of the smoke pipe 24 extending into the smoke return chamber 23 is horizontally arranged, so as to ensure the smooth insertion of the plug 251.

[0065] As Figure 7 shown, the smoke return chamber 23 includes a cylinder 233, two smoke return chamber side plates 231 distributed left and right, and a smoke return chamber top plate 232. The smoke return chamber top plate 232 is fixed on the tops of the two smoke return chamber side plates 231. The smoke return chamber side plates 231 and the smoke return chamber top plate 232 are both fixed to the inner wall of the furnace body 1. The smoke pipe 24 penetrates through the smoke return chamber side plate 231 on the left side. The cylinder 233 penetrates through the smoke return chamber side plate 231 on the right side. The space inside the cylinder 233 is communicated with the space between the two smoke return chamber side plates 231. One end of the cylinder 233 extends out from one side of the furnace body 1, and the port of the cylinder 233 is blocked by a flange.

[0066] A protective plate 258 is fixed on both the front side and the rear side of the cylinder 233. The protective plate 258 is fixed to the inner wall of the furnace body 1. The transmission shaft 255 is located between the two protective plates 258. Moreover, both ends of the moving plate 253 are movably connected to the two smoke return chamber side plates 231 through sealed bearings, and both ends of the transmission shaft 255 are movably connected to the smoke return chamber side plate 231 and the side wall of the furnace body 1 through sealed bearings. The provided protective plate 258 can separate the transmission shaft 255 from the water in the furnace body 1 to prevent the transmission shaft 255 from being corroded and damaged in the water.

[0067] As Figures 1 to 3 shown, sewage pipes 5 are communicated among the bottom end of the flue 3, the bottom end of the smoke return chamber 23, and the bottom end of the furnace body 1. The sewage pipes 5 arranged at this position help to respectively discharge the hydraulic water formed by condensation through the condensation component 7 in the flue 3, the liquid water flowing out from the inside of the smoke pipe 24 in the smoke return chamber 23, and the liquid water used as a heat exchange medium inside the furnace body 1.

[0068] It should be emphasized that since the humidity detection instrument belongs to a mature technical solution in the prior art, it is not elaborated in this application. Specifically, in the embodiments of the present invention, a detection instrument that can be used in a high-temperature environment can be selected, such as the RHS-200 high-temperature humidity meter, HC2A-IC102, or the HJY-330 online high-temperature humidity detector, etc.

[0069] Moreover, in the embodiments of the present invention, the automatic control of the driving member 257 and the reception of data in the humidity detection instrument are both realized through an external automated control system. This control process can be achieved through programming in the prior art and belongs to mature prior art, so it is not elaborated in this application.

[0070] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A removable tube shell indirect heating furnace, characterized in that: It comprises a furnace body, a water injection pipe arranged at the top of the furnace body, a combustion and heating component arranged at the bottom end of the furnace body, and a heat exchange tube detachably arranged at the top of the combustion and heating component, and a flue for discharging smoke in the combustion and heating component is arranged on one side of the heat exchange tube; The combustion and heating assembly includes a burner base, a fire tube connected to the burner base, a smoke return chamber connected to the fire tube and the flue, and a plurality of inclined smoke pipes connected between the fire tube and the smoke return chamber; The smoke pipe is provided with a plurality of independent cavities inside, and a smoke pipe plugging mechanism is installed in the smoke return chamber, and the smoke pipe plugging mechanism is used to selectively plug part of the cavities to adjust the smoke pressure and humidity in the smoke pipe; the smoke pipe plugging mechanism comprises a plurality of groups of plugs, a connecting frame, a movable plate, a reciprocating screw and a driving assembly; the number of the plugs is consistent with the number of cavities in the smoke pipe, each group of plugs corresponds to plugging a cavity of the smoke pipe, and the plurality of groups of plugs are arranged horizontally along the smoke return chamber; Each group of the plugs is fixed by a connecting frame, the bottom of the connecting frame is connected to a moving plate, the moving plate is threadedly matched with the reciprocating screw, and the driving assembly is transmission-connected with the reciprocating screw to drive the plugs to move along the smoke return chamber.

2. The extractable tube shell indirect heating furnace according to claim 1, characterized in that: The lengths of the movable plates at the bottom ends of the multiple groups of plugs decrease from left to right, and the reciprocating screw rods at the bottom ends of the multiple groups of plugs distributed from left to right are distributed inside the smoke return chamber from bottom to top.

3. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: The heat exchange tube comprises a plurality of heat exchange coils, a fixing bracket, a coil mounting flange, an inlet pipe, an outlet pipe and a coil connecting bracket; The plurality of heat exchange coils are fixed together by the coil connection bracket, the bottom of the coil connection bracket is provided with the fixing bracket, and the fixing bracket is fixed to the inner wall of the furnace body; The inlet and outlet ends of the heat exchange coil both extend from a side of the furnace body away from the flue, the side of the furnace body away from the flue is detachably connected with the coil mounting flange, and the inlet and outlet ends of the heat exchange coil are both fixed to the coil mounting flange; The inlet ends and outlet ends of the plurality of heat exchange coils are respectively connected to the inlet pipe and the outlet pipe, and the inlet pipe and the outlet pipe are both located at one side of the furnace body.

4. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: The smoke return chamber comprises a cylinder, a smoke return chamber side plate and a smoke return chamber top plate; The top plate of the smoke return chamber is fixed to the top of the side plate of the smoke return chamber, and the side plate and the top plate of the smoke return chamber are both fixed to the inner wall of the furnace body; The smoke pipe passes through the side plate of the smoke return chamber on the left side, and the cylinder passes through the side plate of the smoke return chamber on the right side. The interior of the cylinder is connected to the space between the side plates of the smoke return chamber. One end of the cylinder extends out from one side of the furnace body, and the port of the cylinder is blocked by a flange. Protective plates fixedly connected to the inner wall of the furnace body are fixed on the front and rear sides of the cylinder.

5. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: The fire tube includes two round tubes and a threaded tube, and the threaded tube is fixed between the two round tubes; wherein, An end of the round tube located on the left side of the threaded tube away from the threaded tube is connected to the inside of the burner base; and, One end of the round tube located on the right side of the threaded tube and away from the threaded tube is communicated with the interior of the smoke return chamber.

6. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: A short section of flue is fixed at one end of the top of the furnace body, and the short section of flue is connected to the inside of the flue; a condensation component is fixed inside the flue, and the condensation component is located at the top of the flue pipe; The condensation assembly includes a heat conduction plate and a condensation tube located inside the heat conduction plate, with gaps left between the two ends of the heat conduction plate and the inner wall of the flue, and the two ends of the condensation tube passing through the heat conduction plate and the rear wall of the furnace body, so that the flue gas discharged from the smoke tube first flows along the bottom wall of the heat conduction plate to the two ends, then rises to the top through the gap between the heat conduction plate and the inner wall of the flue, and is finally discharged through the short section of the flue.

7. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: The bottom end of the flue, the bottom end of the smoke return chamber and the bottom end of the furnace body are all connected with a sewage pipe.

8. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: A manhole is fixed on the front side of the furnace body, a thermal resistor joint sleeve is arranged on one side of the bottom of the manhole, and one end of the furnace body provided with a flue is connected to the wall panel.

9. A removable tube shell indirect heating furnace according to any one of claims 1 to 2, characterized in that: A bottom plate is provided at the bottom of the furnace body, and the bottom of the furnace body is separated from the ground by the bottom plate.

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