Flue gas waste heat evaporator of commercial gas stove

Abstract

The invention discloses a flue gas waste heat evaporator of a commercial gas stove, the waste heat evaporator comprises an outer shell, an inner shell is arranged in the outer shell, a water jacket for water to flow is formed between the outer shell and the inner shell, the inner shell is communicated with a first smoke exhaust pipe penetrating through the outer shell, a heat exchange pipe bundle group is obliquely arranged in the inner shell, and the heat exchange pipe bundle group is communicated with a second smoke exhaust pipe penetrating through the outer shell. An auxiliary heating piece is arranged in the heat exchange tube bundle group; the steam outlet is formed in the top of the shell; provided is a triple steam-water separation device. The water jacket is formed by the outer shell and the inner shell, high-temperature flue gas is wrapped in the inner shell, the heat exchange face of the waste heat evaporator is expanded, meanwhile, heat dissipation of the high-temperature flue gas to the outside is avoided, natural temperature difference circulation is applied to the heat exchange structure through the inclined design of the heat exchange tube bundle set and the top plate of the inner shell, and heat exchange efficiency is improved. And in addition, the flue gas side fins are adopted to expand the heat exchange area, so that the waste heat recovery efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat evaporators, in particular to a flue gas waste heat evaporator of a commercial gas stove. Background Art

[0002] At present, the high-temperature smoke generated by commercial gas stoves when in use is usually discharged to the kitchen environment through the flue, and then forcibly discharged to the outdoor atmosphere through the smoke exhaust ventilation system. This method has the following defects:

[0003] 1. There is a large amount of heat energy in high-temperature flue gas. Directly discharging it not only poses a fire hazard, but also causes dampness and heat in the kitchen space, a poor working environment for cooks, and increases the burden on smoke exhaust and ventilation equipment and air conditioning equipment;

[0004] 2. The waste heat of high-temperature flue gas cannot be well recovered and utilized. Most of the time, hot water is prepared through high-temperature flue gas, and a small amount of products are used to prepare boiling water. It is not convenient to independently meet the steam demand by generating steam through waste heat recovery. When steaming food, other steam equipment is often required to supplement it, which increases energy consumption. Although some can recover the waste heat of high-temperature flue gas to generate steam, the water content of the steam is generally high, which affects the efficiency and quality of steaming food.

[0005] Therefore, we propose a flue gas waste heat evaporator for commercial gas stoves. Summary of the invention

[0006] The object of the present invention is to provide a flue gas waste heat evaporator for a commercial gas stove to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A flue gas waste heat evaporator for a commercial gas stove is arranged on the flue of the gas stove to process the high-temperature flue gas generated by the gas stove. The waste heat evaporator comprises:

[0009] An outer shell is provided inside the inner shell, a water jacket for water flow is formed between the outer shell and the inner shell, a smoke exhaust pipe that runs through the outer shell is connected to the inner shell, a heat exchange tube bundle group is obliquely provided in the inner shell, an auxiliary heating element is provided in the heat exchange tube bundle group, and a smoke inlet connecting the inner shell and the flue is provided on the outer shell;

[0010] A steam outlet is provided at the top of the housing;

[0011] Triple steam-water separation unit, used to remove water from steam, including:

[0012] A gravity settling chamber, formed by the top of the inner shell and the inner wall of the outer shell and through which the smoke exhaust pipe passes;

[0013] A steam-water separation box is arranged in the gravity settling chamber and is located at the steam outlet;

[0014] The filter assembly is arranged in the steam outlet.

[0015] A further improvement is that the inner shell is composed of surrounding side plates and a top plate arranged on the top of the side plates, the top plate is inclined and immersed below the water level, the heat exchange tube bundle group includes a plurality of groups of small fin tubes and a large fin tube located above the plurality of groups of small fin tubes, both ends of the small fin tubes and the large fin tubes pass through the side plates and are connected to the water jacket, and the small fin tubes and the large fin tubes are both inclined at a certain angle to the horizontal direction, and the heating end of the auxiliary heating element extends into the large fin tube.

[0016] A further improvement is that a float water replenishment tank is provided on one side of the outer shell, and the float water replenishment tank is connected to the lower part of the water jacket through a pipeline. The float water replenishment tank is provided with a liquid level sensor for detecting the water level height inside the water jacket, and the inner wall of the outer shell is provided with a water temperature sensor for detecting the water temperature in the water jacket. A smoke temperature sensor is provided in the smoke exhaust pipe, and the liquid level sensor, water temperature sensor and smoke temperature sensor are all connected to a controller, and the controller is electrically connected to the auxiliary heating element.

[0017] A further improvement is that the steam-water separation box is composed of an inner wall of an outer shell and a folded plate arranged on the inner wall of the outer shell, and a plurality of groups of small holes are opened on the side of the folded plate facing the smoke exhaust pipe, and the bottom of the folded plate is inclined at a certain angle to the horizontal direction and corresponds to the water jacket area where the higher end of the heat exchange tube bundle is located.

[0018] A further improvement is that the filter assembly comprises:

[0019] A connecting pipe is arranged in the steam outlet;

[0020] The air intake head is detachably arranged in the connecting pipe, and its bottom end is connected with an air intake pipe with a closed bottom. One end of the air intake pipe extends into the steam-water separation box. The outer wall of the air intake pipe is provided with a plurality of groups of through holes, and the outer wall is covered with a multi-layer mesh structure. The top end of the air intake head is connected with a tee, and one end of the tee is connected with a pressure relief valve, and the other end is provided with a steam exhaust port.

[0021] A further improvement is that the upper end of the air intake pipe is rotatably connected to a carrying ring, and the carrying ring is fixed in the bottom end of the air intake head. A hollow column is provided in the carrying ring, and one end of the hollow column extends to the lower end of the air intake pipe. A plurality of assembly rods are symmetrically inserted on both sides of the outer wall of the hollow column. Air vents are evenly opened on the outer wall of the assembly rods, and a high-temperature resistant flexible water-absorbing part is provided in the inner cavity of the assembly rods. An impeller component is provided in the steam exhaust port, and one end of the shaft of the impeller component extends into the air intake pipe and is transmission-connected to the air intake pipe through a gear set. When the impeller component is driven to rotate by steam, the air intake pipe is driven to rotate through the gear set.

[0022] A further improvement is that a sleeve is movably sleeved on the outer wall of the assembly rod, and two air holes are evenly opened on the outer wall of the sleeve. The sleeve is driven to rotate by a gear part inserted into the outer wall of the hollow column. The gear part is meshed with a rack, and the rack is connected to the bottom wall of the hollow column through an elastic connecting rod. The rack drives the gear part upward to drive the sleeve to rotate, so that the second through hole and the first through hole are staggered. A movable column is rotatably connected to the top of the elastic connecting rod, and a magnetic block is rotatably sleeved on the outer wall of the movable column. An electromagnetic block is arranged at a distance above the magnetic block for electrically adsorbing the magnetic block to drive the movable column upward. The electromagnetic block is arranged at the bottom of the hollow block, and the hollow block is connected to the load-bearing ring and the hollow column.

[0023] A further improvement is that an impeller component 2 is rotatably provided in the cavity of the hollow block, one end of the shaft of which corresponds to the movable column, the shaft of the impeller component 2 is provided with a docking groove, and one end of the movable column is provided with a docking block, the cavity is connected to the air injection pipe and the air outlet pipe, one end of the air injection pipe is connected to the insulation shell, and the air outlet pipe is connected to the hollow column, and an exhaust pipe is also inserted on the hollow block, one end of the exhaust pipe is connected to the inner cavity of the hollow column, and the other end is connected to the second smoke exhaust pipe, the second smoke exhaust pipe is connected to an electric three-way valve, and the electric three-way valve is connected to the insulation shell and the first smoke exhaust pipe, solenoid valves are provided in the air injection pipe and the exhaust pipe, and the insulation shell is connected to corresponding pistons through elastic parts.

[0024] A further improvement is that the sliding sleeve on the outer wall of the movable column is provided with several groups of push blocks, and the push blocks are also rotatably arranged on a bracket fixed on the inner wall of the hollow column. The outer wall of the push block is provided with a slide groove adapted to its outer contour, and a movable connecting rod is movably embedded on both sides of the slide groove. The opposite ends of the movable connecting rods on both sides extend into the assembly rods on both sides respectively and are connected to the pressure plate with holes. When the movable column rotates, the push blocks drive the movable connecting rods to drive the pressure plate with holes to squeeze the high-temperature resistant flexible water-absorbing part in the assembly rod.

[0025] A further improvement is that the hollow column includes an elastic telescopic rod, the bottom of the movable section of the elastic telescopic rod is in contact with a detection sensor 1 arranged on a connecting seat, the connecting seat is movably inserted at the bottom of the air intake pipe and connected to the steam-water separation box, and a detection sensor 2 for detecting the piston is provided below the inner wall of the insulation shell. The detection sensor 1 and the detection sensor 2 are both electrically connected to the controller. When the detection sensor 1 detects that the movable section of the elastic telescopic rod reaches the first pressure threshold and the second pressure threshold, the electric three-way valve and the solenoid valve and the solenoid block in the air injection pipe are respectively controlled through the controller. When the detection sensor 2 detects the piston, the electric three-way valve is controlled through the controller.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The outer shell and the inner shell of the present invention form a water jacket, which encloses the high-temperature flue gas in the inner shell, expands the heat exchange surface of the waste heat evaporator, and avoids the heat dissipation of the high-temperature flue gas to the outside. The natural temperature difference cycle is applied to the heat exchange structure through the inclined design of the heat exchange tube bundle group and the inner shell top plate, which increases the fluidity of water in the evaporator and thus enhances the heat transfer effect. In addition, the flue gas side fins are used to expand the heat exchange area, and the expected waste heat recovery efficiency can be achieved with fewer fin tubes and smaller heat exchange space. Compared with traditional flue gas waste heat recovery, the waste heat evaporator of the present invention can reduce the flue gas temperature of 500-800°C to below 150°C, and the waste heat recovery efficiency is high;

[0028] 2) The introduction and automatic start-stop control of the auxiliary heating element of the present invention can solve the problem that the use time of the stove and the steam-using equipment is not synchronized, which affects normal cooking. The auxiliary heating element is placed in the high-temperature water area of ​​the shell, which can always obtain the maximum steam output with less auxiliary energy, and can also achieve the purpose of continuous and stable steam supply. By appropriately pressurizing the steam in the waste heat evaporator, the temperature control range is expanded, which is convenient for accurate temperature control of the auxiliary heating, and can well control the intervention and exit of the auxiliary heating;

[0029] 3) When the present invention is in use, the steam flows vertically upward from the water jacket at the higher end of the tube along the tube mouth of the heat exchange tube bundle group from low to high and hits the bottom of the folded plate. Part of the water in the steam is rebounded back to the water below. At the same time, the steam flow direction is turned 90 degrees and enters the gravity settling chamber horizontally. The steam flow rate drops sharply in the gravity settling chamber, and the water carried by the steam is settled into the lower water by gravity. In addition, as soon as the smoke exhaust pipe passes through the gravity settling chamber, the wet steam continues to be heated and further vaporized on the outer wall of the smoke exhaust duct, and then turns back 180 degrees and passes through the small holes on the side of the folded plate. The water carried by the steam is blocked and separated again and falls below. After the steam enters the steam-water separation box, it is further processed by the filter assembly. The water vapor separation design with multiple levels and different technologies superimposed enables the waste heat evaporator to achieve good water vapor separation effect in a smaller space, and the steam moisture content can be controlled below 3%. The steam quality is higher than that of the traditional gas stove flue gas waste heat recovery device;

[0030] 4) When the steam is discharged from the steam outlet, the filter assembly of the present invention rotates the air intake pipe through the impeller member 1 and the gear set. The centrifugal force of the air intake pipe rotation not only enhances the disturbance effect of the steam, but also makes the separation of water and steam more thorough. At the same time, it makes it difficult for the water at the separation point to adhere to the multi-layer mesh structure of the outer wall of the air intake pipe to affect the entry of steam. Moreover, after the steam enters the air intake pipe, it contacts the high-temperature resistant flexible water-absorbing member on the outer wall of the hollow column more evenly, and the high-temperature resistant flexible water-absorbing member further improves the effect of removing water from the steam.

[0031] 5) The present invention can drive the sleeve to rotate when the high temperature resistant flexible water absorbent absorbs a certain amount of water, so that the steam will no longer enter the assembly rod and contact the high temperature resistant flexible water absorbent, and at the same time inject the exhausted smoke into the hollow column, and use the heat of the exhausted smoke to heat the high temperature resistant flexible water absorbent so that it can be regenerated and recycled, and when the smoke enters the hollow column, the high temperature resistant flexible water absorbent is reciprocally squeezed, thereby accelerating the desorption and evaporation of water and improving the regeneration efficiency of the high temperature resistant flexible water absorbent, so as to ensure the water absorption quality of the high temperature resistant flexible water absorbent and ensure that it maintains a high efficiency water absorption capacity in subsequent use.

[0032] 6) The flue gas waste heat evaporator of the present invention can be integrated into the gas stove device itself, without increasing or changing the external structural dimensions of the stove, thus improving the space utilization rate, making the device compact and occupying a small area, and the waste heat evaporator of the present invention is installed on the flue, so that all the high-temperature waste heat of the flue gas can be recycled without affecting the use effect of the stove and reducing the thermal efficiency of the stove itself, and steam is produced to supply the kitchen to replace the energy consumption of the original steam box and other equipment, thus achieving significant energy-saving and emission-reduction benefits; BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a cross-sectional view of the structure of the flue gas waste heat evaporator of the present invention;

[0034] Figure 2 For the present invention Figure 1 Side view of local structure;

[0035] Figure 3 It is a schematic structural diagram of the triple steam-water separation device of the present invention;

[0036] Figure 4 It is a schematic diagram of the air intake pipe structure of the present invention;

[0037] Figure 5 For the present invention Figure 4 Top view of local structure;

[0038] Figure 6 For the present invention Figure 4 Structural cross-section view;

[0039] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure A;

[0040] Figure 8 For the present invention Figure 6 A magnified schematic diagram of the B structure;

[0041] Fig. 9 For the present invention Figure 6 Schematic diagram of the local structure in;

[0042] Fig.10It is a schematic diagram of the connection between the waste heat evaporator and the gas stove of the present invention.

[0043] In the figure: 1, outer shell; 2, inner shell; 3, water jacket; 4, small fin tube; 5, smoke inlet; 6, large fin tube; 7, auxiliary heating element; 8, smoke exhaust pipe 1; 9, triple steam-water separation device; 91, gravity settling chamber; 92, steam-water separation box; 901, folding plate; 902, small hole; 93, connecting pipe; 94, air inlet head; 95, air inlet pipe; 96, multi-layer mesh structure; 97, three-way piece; 98, pressure relief valve; 99, steam exhaust port; 910, impeller part 1; 911, load ring; 912, gear set; 913, hollow column; 914, assembly rod; 915, high temperature resistant flexible water absorbing part; 916, elastic 917, rack; 918, movable column; 919, docking block; 920, hollow block; 921, electromagnetic block; 922, push block; 923, movable connecting rod; 924, perforated pressure plate; 925, impeller part 2; 926, exhaust pipe; 927, air injection pipe; 928, air outlet pipe; 929, sleeve; 930, connecting seat; 931, detection sensor 1; 932, insulation shell; 933, piston; 934, gear part; 935, electric three-way valve; 936, exhaust pipe 2; 10, liquid level sensor; 11, water temperature sensor; 12, float water tank; 13, flue gas temperature sensor. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Example 1

[0046] Please refer to the attached picture - Figure 3 and attached Fig.10 , attached Fig.10 A is the furnace of the gas stove, b is the flue of the gas stove, and c is the back top plate of the gas stove;

[0047] A flue gas waste heat evaporator for a commercial gas stove is arranged on the flue of the gas stove to process the high-temperature flue gas generated by the combustion of gas during cooking. Specifically, the furnace a of the stove is closed or nearly closed, and the high-temperature flue gas generated by the combustion of gas during cooking is discharged from the furnace a through the flue b and then from the rear top plate c. The flue gas waste heat evaporator is arranged on the flue b of the gas stove, and the water in the flue gas waste heat evaporator absorbs the heat energy of the high-temperature flue gas to generate steam to supply the needs of the kitchen. A fully enclosed furnace can be preferably used to reduce the discharge of flue gas from the pot ring mouth, and all the high-temperature flue gas in the furnace is discharged. The waste heat is recycled through the flue b and the waste heat evaporator, thereby achieving higher energy utilization efficiency. Compared with traditional stoves, the energy utilization efficiency is improved by more than 50%, and can be integrated into the gas stove equipment itself without increasing or changing the external structure and dimensions of the stove. The space utilization rate is improved, the equipment is compact and occupies a small area, and is installed on the flue. The high-temperature waste heat of all flue gas is recycled and utilized without affecting the use effect of the stove and without reducing the thermal efficiency of the stove itself. Steam is produced to supply the kitchen to replace the energy consumption of the original steamer and other equipment, which has significant energy-saving and emission reduction benefits.

[0048] The waste heat evaporator includes:

[0049] An outer shell 1 is provided with an inner shell 2 inside, both the inner shell 2 and the outer shell 1 have rectangular cross-sections, and a plurality of tie rods are welded between the inner shell 2 and the outer shell 1 for reinforcement so that they do not deform under a certain pressure, a water jacket 3 for water flow is formed between the outer shell 1 and the inner shell 2, the top of the inner shell 2 is connected to a smoke exhaust pipe 8 that runs through the top of the outer shell 1, a heat exchange tube bundle group is obliquely provided in the inner shell 2, an auxiliary heating element 7 (such as an electric heating tube) is provided in the heat exchange tube bundle group, a smoke inlet 5 connecting the inner shell 2 and the flue is provided at the bottom of the outer shell 1, and a sewage outlet is also provided at the bottom of the outer shell 1, and a heat insulation material can be laid on the outside of the outer shell 1;

[0050] Furthermore, the inner shell 2 is composed of surrounding side plates and a top plate arranged on the top of the side plates, the top plate is inclined and immersed below the water level, the heat exchange tube bundle group includes a plurality of groups of small fin tubes 4 arranged in parallel and staggered arrangement from top to bottom and a large fin tube 6 located above the plurality of groups of small fin tubes 4, the large fin tube 6 is specifically located at a higher water level position in the water jacket 3, the inner diameter of the large fin tube 6 is greater than the inner diameter of the small fin tube 4, both ends of the small fin tube 4 and the large fin tube 6 penetrate the side plates and are connected to the water jacket 3, and the small fin tube 4 and the large fin tube 6 are inclined at a certain angle to the horizontal direction, from the attached Figure 1It can be seen that the left ends of the small fin tube 4 and the large fin tube 6 are higher than their right ends, and the heating end of the auxiliary heating element 7 extends into the large fin tube 6; the wall surface of the inner shell 2, the top plate, the small fin tube 4, and the large fin tube 6 with the auxiliary heating element 7 installed together form a heat exchange surface with the high-temperature flue gas, and a temperature difference natural circulation loop is formed between the top plate of the inner shell 2 installed obliquely, the small fin tube 4 with a flow inclination, and the large fin tube 6, and the large fin tube 6 are arranged in the upper high-temperature zone of the water. The auxiliary heating element 7 always further heats and vaporizes the boiling or nearly boiling high-temperature hot water, and can continuously and stably generate steam in various situations when the stove is used at a high fire, a low fire, or temporarily not used, and can reduce the energy consumption of auxiliary heating;

[0051] Furthermore, a float water replenishment tank 12 is provided on one side of the shell 1, which is also connected to the lower part of the water jacket 3 through a pipeline. The water inlet of the float water replenishment tank 12 is connected to the water source. The float water replenishment tank 12 usually has a water inlet, which can be directly connected to an external water source (such as a tap water pipe, a water pump or other water supply system). When the float water replenishment tank 12 is in use, when the water level in the water tank drops, the float sinks, driving the connecting rod to open the water inlet valve, and the external water source starts to replenish water to the water tank. When the water level rises to a set height, the float floats up, driving the connecting rod to close the water inlet valve and stop replenishing water. This belongs to the prior art and is not described in detail here. The float water replenishment tank 12 is provided with a liquid level sensor 10 for detecting the internal water level height of the water jacket 3, which plays a role of double protection. It is specifically located below the float of the float water replenishment tank 12, and the inner wall of the shell 1 is provided with A water temperature sensor 11 is used to detect the water temperature inside the water jacket 3, a smoke temperature sensor 13 is provided in the smoke exhaust pipe 8, the liquid level sensor 10, the water temperature sensor 11 and the smoke temperature sensor 13 are all connected to the controller, and the controller is electrically connected to the auxiliary heating element 7. Further, an automatic start-stop switch button for controlling the auxiliary heating element 7 can be installed in front of the gas stove. Once the liquid level sensor 10 fails to detect the water level after the gas stove is powered on, a water shortage alarm will be issued, and the auxiliary heating element 7 will not start to work. When the liquid level is in a normal state, after pressing the automatic start-stop switch button, the auxiliary heating element 7 automatically starts and stops around the set water temperature control signal in the waste heat evaporator. When the smoke temperature sensor 13 detects that the smoke temperature value exceeds the set temperature, the controller can issue a prompt sound and flash a light on the display screen to remind;

[0052] A steam outlet is provided at the top of the housing 1;

[0053] The triple steam-water separation device 9 is used to remove water from the steam, including:

[0054] The gravity settling chamber 91 is formed by the top of the inner shell 2 and the top wall of the outer shell 1 and is passed through by the smoke exhaust pipe 8. The gravity settling chamber 91 is located on the steam flow path, and the steam is gravity-set through the gravity settling chamber 91.

[0055] The steam-water separation box 92 is arranged in the gravity settling chamber 91 and is located at the steam outlet;

[0056] Furthermore, the steam-water separation box 92 is composed of three inner walls of the shell 1 and an "L"-shaped folding plate 901. The folding plate 901 is provided with a plurality of small holes 902 on one side facing the exhaust pipe 8. The bottom of the folding plate 901 is inclined at a certain angle to the horizontal direction. Figure 1 It can be seen that the left end of the bottom of the folded plate 901 is higher than the right end of the bottom thereof, and corresponds to the area of ​​the water jacket 3 where the higher end of the heat exchange tube bundle is located. When in use, the high-temperature steam-water mixture (steam) flows vertically upward from the water jacket 3 with the higher end of the tube along the tube mouth of the heat exchange tube bundle from low to high and hits the bottom of the folded plate 901. Part of the water in the high-temperature steam-water mixture (steam) is rebounded back to the water below. At the same time, the flow direction of the high-temperature steam-water mixture (steam) is turned 90° and enters the gravity settling chamber 91 in the horizontal direction. The flow rate of the high-temperature steam-water mixture (steam) in the gravity settling chamber 91 drops sharply, and the water carried by the steam is settled into the lower water by gravity. Moreover, because the exhaust pipe 8 passes through the gravity settling chamber 91, the wet steam continues to be heated and further vaporized on the outer wall of the exhaust duct, and then turns back 180° and passes through the small hole 902 on the side of the folded plate 901. The water carried by the steam is blocked and separated again and falls below. The steam passes through the steam-water separation box 92 and flows to the steam outlet.

[0057] The filter assembly is arranged in the steam outlet to further process the moisture in the steam.

[0058] Example 2

[0059] Please refer to the attached Figure 3 Based on Example 1, the filter assembly of this embodiment includes:

[0060] A connecting pipe 93 is provided in the steam outlet, and the connecting pipe 93 is an internal threaded connecting pipe, which is threadedly connected to the steam outlet;

[0061] The air inlet head 94 is detachably arranged in the connecting pipe 93, and the two can be connected by threaded connection. The bottom end of the air inlet head 94 is connected to the bottom closed air inlet pipe 95. The outer diameter of the air inlet pipe 95 is smaller than the inner diameter of the connecting pipe 93. One end of the air inlet pipe 95 extends into the steam-water separation box 92. The outer wall of the air inlet pipe 95 is provided with a plurality of groups of through holes, and the outer wall of the air inlet pipe 95 is provided with a multi-layer mesh structure 96. The multi-layer mesh structure 96 is, for example, a multi-layer stainless steel wire mesh. Specifically, the upper and lower ends of the outer wall of the air inlet pipe 95 are provided with There is a card slot, and the multi-layer mesh structure 96 is fixed on the card slot with a clamping ring; the top of the air inlet head 94 is connected to a three-way piece 97, and one end of the three-way piece 97 is connected to a pressure relief valve 98, and the other end is provided with a steam outlet 99. The steam entering the steam-water separation box 92 passes through the multi-layer mesh structure 96 and the through hole and enters the air inlet pipe 95. The moisture in the steam is further removed through the multi-layer mesh structure 96 and the through hole, and then the steam can be discharged through the air inlet head 94, the three-way piece 97 and the steam outlet 99.

[0062] Example 3

[0063] Please see attached Figure 4 -Attached Fig. 9On the basis of Example 2, the upper end of the air intake pipe 95 of this embodiment is rotatably connected to the carrying ring 911 through a bearing, and the carrying ring 911 is fixed in the bottom end of the air intake head 94. A hollow column 913 is provided in the carrying ring 911. The hollow column 913 and the air intake pipe 95 are on the same axis, and the top and the inner cavity are both hollow. One end of the hollow column 913 extends to the lower end of the air intake pipe 95, and a plurality of groups of assembly rods 914 are symmetrically inserted on both sides of the outer wall of the hollow column 913. The assembly rods 914 are connected to the inner cavity of the hollow column 913, and the outer wall of the assembly rods 914 is evenly provided with ventilation holes 1, and the inner cavity is provided with a high-temperature resistant flexible water-absorbing member 915. The high-temperature resistant flexible water-absorbing member 915 can preferably adopt a high-temperature resistant silicone sponge. The high-temperature resistant silicone sponge will not be damaged by the steam temperature and can absorb moisture in the steam when the steam flows, thereby further improving the quality of steam-water separation. An impeller member 910 is provided in the steam outlet 99. The impeller Component 910 is composed of an impeller and a shaft. One end of the shaft of impeller component 910 extends into the air inlet pipe 95 and is connected to the air inlet pipe 95 through a gear set 912. Specifically, the gear set 912 is a gear ring (or tooth groove) provided on the inner wall of the air inlet pipe 95 and an active gear provided on the shaft of impeller component 910 and meshing with the gear ring (or tooth groove). When impeller component 910 is driven to rotate by steam, the air inlet pipe 95 is driven to rotate through the gear set 912. In this way, the air inlet pipe 95 drives the multi-layer mesh structure 96 to rotate. Under the action of centrifugal force, not only the disturbance effect of the steam is enhanced, but also the separation of water and steam is more thorough. At the same time, it is not easy for the water at the separation point to adhere to the multi-layer mesh structure 96 and affect the steam entering the air inlet pipe 95. Moreover, after the steam enters the air inlet pipe 95, it contacts with the high-temperature resistant flexible water absorbent component 915 more evenly, so that the water in the steam is better absorbed by the high-temperature resistant flexible water absorbent component 915.

[0064] Preferably, the outer wall of the assembly rod 914 of the present embodiment is movably sleeved with a sleeve 929, and the outer wall of the sleeve 929 is evenly provided with a vent hole 2 for communicating with the vent hole 1. The sleeve 929 is driven to rotate by a gear member 934 inserted into the outer wall of the hollow column 913. The gear member 934 includes a rotating shaft, a driven gear sleeved on the end of the rotating shaft, and a driving gear sleeved on the outer wall of the rotating shaft and located in the inner cavity of the hollow column 913. The outer wall of the sleeve 929 is provided with a tooth groove meshing with the driven gear. The gear member 934 meshes with a rack 917 movably arranged in the inner cavity of the hollow column 913. The rack 917 is eccentrically arranged in the inner cavity of the hollow column 913, and the bottom of the rack 917 is connected to the hollow column 913 through an elastic connecting rod 916 (for example, an elastic telescopic rod). The bottom wall is connected, and the top of the elastic connecting rod 916 is rotatably connected to a movable column 918 through a bearing. The other end of the outer wall of the movable column 918 is rotatably sleeved with a magnetic block, and an electromagnetic block 921 is arranged above the magnetic block. The electromagnetic block 921 is arranged at the bottom of the hollow block 920, and one end of the hollow block 920 is connected to the inner wall of the carrying ring 911. The hollow block 920 is also connected to one end of the hollow column 913. When the electromagnetic block 921 is energized, it adsorbs the magnetic block and drives the elastic connecting rod 916 and the rack 917 upward through the movable column 918. The rack 917 drives the gear part 934 upward to drive the sleeve 929 to rotate, so that the through hole 2 and the through hole 1 are staggered, so that the high temperature resistant flexible water absorbent 915 no longer absorbs moisture or discharges moisture into the discharged steam.

[0065] As a preferred embodiment, a cavity is provided in the hollow block 920 of the present embodiment, and an impeller member 925 is rotatably provided in the cavity. The impeller member 925 is the same as the impeller member 910 described above. One end of the shaft of the impeller member 925 passes through the hollow block 920 and corresponds to the movable column 918. A docking groove is provided in the shaft of the impeller member 925. A docking block 919 is provided at one end of the movable column 918 to be inserted into the docking groove when the electromagnetic block 921 adsorbs the magnetic block. The cross-sections of the docking groove and the docking block 919 may be rectangular or polygonal. After entering the docking groove, the impeller 925 can drive the movable column 918 to rotate when rotating. The cavity is connected with an air injection pipe 927 and an air outlet pipe 928. One end of the air injection pipe 927 passes through the hollow block 920 and the air inlet head 94 and is connected to the heat preservation shell 932. The heat preservation shell 932 is made of heat preservation material and is not described in detail here. The air outlet pipe 928 is connected to the inner cavity of the hollow column 913. The hollow block 920 is also provided with an exhaust pipe 926. One end of the exhaust pipe 926 is connected to the inner cavity of the hollow column 913, and the other end of the exhaust pipe 926 is connected to the inner cavity of the hollow column 913. The end of the electric three-way valve 935 passes through the hollow block 920 and the air inlet head 94 and is connected to the second smoke exhaust pipe 936. The second smoke exhaust pipe 936 is arranged at one output end of the electric three-way valve 935. The other output end of the electric three-way valve 935 is connected to the insulation shell 932 through a connecting pipeline. The input end of the electric three-way valve 935 is connected to the smoke exhaust pipe 8. The electric three-way valve 935 belongs to conventional equipment in the field. When the electric three-way valve 935 is opened, the smoke exhaust pipe 8 can be connected to the connecting pipeline, so that the smoke discharged from the smoke exhaust pipe 8 enters the connecting pipe. The smoke gas will then enter the insulation shell 932 instead of entering the smoke exhaust pipe 2 936; similarly, when the electric three-way valve 935 is closed, the smoke exhaust pipe 1 8 can be connected to the smoke exhaust pipe 2 936, so that the smoke exhausted from the smoke exhaust pipe 1 8 enters the smoke exhaust pipe 2 936 and is exhausted through the smoke exhaust pipe 2 936. In actual conditions, the smoke exhaust pipe 2 936 passes through the rear top plate c, and solenoid valves are provided in the air injection pipe 927 and the exhaust pipe 926. The insulation shell 932 is connected to a corresponding piston 933 by an elastic member (such as a spring).

[0066] As a preferred embodiment, the outer wall of the movable column 918 of this embodiment is slidably sleeved with a plurality of groups of push blocks 922. Specifically, the inner wall of the push block 922 is provided with a slider, and the outer wall of the movable column 918 is provided with a vertical slide groove adapted to the slider. The push block 922 has an elliptical cross-section. The push block 922 is also rotatably arranged on a bracket fixed to the inner wall of the hollow column 913 through a bearing, so that the push block 922 will not move with the movable column 918. The outer wall of the push block 922 is provided with a vertical slide groove corresponding to its outer contour. An adapted slide groove has a movable connecting rod 923 movably embedded on both sides of the slide groove. The vertical cross-section of the end of the movable connecting rod 923 is T-shaped and adapted to the slide groove, so that it is not easy to separate from the slide groove. The opposite ends of the movable connecting rods 923 on both sides extend into the assembly rods 914 on both sides and are connected to the perforated pressure plate 924. When the movable column 918 rotates, the push block 922 drives the movable connecting rod 923 to drive the perforated pressure plate 924 to move back and forth in the assembly rod 914 to squeeze the high-temperature resistant flexible water-absorbing component 915.

[0067] After the high temperature resistant flexible water absorbent 915 has been used for a period of time, the user can open the electromagnetic block 921, at which time the electromagnetic block 921 absorbs the magnetic block and drives the movable column 918 upward, the movable column 918 drives the elastic connecting rod 916 to extend upward, and then the elastic connecting rod 916 drives the rack 917 upward, and the rack 917 drives the gear part 934 to drive the sleeve 929 to rotate, so that the through hole 2 and the through hole 1 are staggered, and then the steam cannot contact the high temperature resistant flexible water absorbent 915 through the through hole 1 and the through hole 2. At the same time, the movable column 918 drives the docking block 919 to enter the docking groove, and at the same time, the electric three-way valve 935 is opened. At this time, the flue gas with a certain temperature (the flue gas is usually reduced to below 150°C after heat exchange) discharged from the exhaust pipe 8 enters the connecting pipeline and then enters the insulation shell 932. The flue gas entering the insulation shell 932 causes the piston 933 to move. After a certain amount of flue gas enters the heat-insulating shell 932, the electric three-way valve 935 is closed, and the solenoid valve in the gas injection pipe 927 is opened. At this time, the piston 933 is compressed into the cavity driven by the elastic member to drive the impeller member 925 to rotate, and at the same time, it is discharged from the outlet pipe 928 to the hollow column 913. The flue gas with a certain temperature flows in the hollow column 913 and contacts with the high-temperature resistant flexible water-absorbing member 915, heating the high-temperature resistant flexible water-absorbing member 915 to regenerate it for recycling. The impeller member 925 rotates through the docking block 919 to drive the movable column 918, and the movable column 918 drives the push block 922. The push block 922 drives the movable connecting rod 923 to make the perforated pressure plate 924 reciprocate and squeeze the high-temperature resistant flexible water-absorbing member 915 in the assembly rod 914, so as to squeeze the water absorbed by the high-temperature resistant flexible water-absorbing member 915 out of the high-temperature resistant flexible water-absorbing member 915.

[0068] After processing for a period of time, the solenoid valve of the exhaust pipe 926 is opened and the solenoid block 921 is closed at the same time, so that the flue gas flowing in the hollow column 913 is discharged through the exhaust pipe 926 and the second smoke exhaust pipe 936. In actual conditions, a filter element can be set in the gas injection pipe 927 and the exhaust pipe 926 to filter the flue gas. After the solenoid block 921 is closed, the elastic connecting rod 916 drives the movable column 918 and the rack 917 to reset downward, and then the sleeve 929 rotates, so that the through hole 2 and the through hole 1 correspond to each other again.

[0069] Example 4

[0070] Please refer to the attached Figure 6 On the basis of Example 3, the hollow column 913 includes an elastic telescopic rod, which includes a fixed section connected to the hollow block 920 at one end, a movable section slidably sleeved on the outer wall of the fixed section, and an elastic reset member (such as a spring) connecting the fixed section and the movable section. A ball abutting against a detection sensor 931 is embedded at the bottom of the movable section. The detection sensor 931 is arranged on a connecting seat 930. The connecting seat 930 is movably inserted at the center of the bottom of the air inlet pipe 95, and one end of the connecting seat is connected to the inner wall of the steam-water separation box 92 to ensure that the air inlet pipe 95 is in a stable state. The inner wall of the warm shell 932 is provided with a detection sensor 2, and the detection sensor 2 contacts the piston 933 when the piston 933 moves downward to a preset position. The detection sensor 1 931 and the detection sensor 2 are electrically connected to the controller. When the detection sensor 1 931 detects that the active section reaches the first pressure threshold and the second pressure threshold, the controller controls the electric three-way valve 935 and the electromagnetic valve and electromagnetic block 921 in the gas injection pipe 927 respectively. When the detection sensor 2 detects the piston 933, the controller controls the electric three-way valve 935;

[0071] The above-mentioned detection sensor 1 931 and detection sensor 2 can both adopt pressure sensors. In actual use, the pressure thresholds of detection sensor 1 931 and detection sensor 2 can be set to control the operation of corresponding electrical devices (for example, through a logic control circuit or a programming controller (such as a PLC or a single-chip microcomputer)). The above-mentioned first pressure threshold is less than the second pressure threshold. When the high-temperature resistant flexible water-absorbing member 915 gradually absorbs moisture, it will cause the movable section to move relative to the fixed section. When the detection sensor 1 931 detects that the pressure of the movable section reaches the first pressure threshold, the detection sensor 1 931 sends a signal to the controller, so that the controller controls the electric three-way valve 935 to open, thereby connecting the smoke exhaust pipe 1 8 and the connecting pipeline. At this time, the smoke discharged from the smoke exhaust pipe 8 enters the insulation shell 932 to drive the piston 933 to move. When the detection sensor 2 detects the piston 933, the electric The three-way valve 935 is closed, so that the smoke exhaust pipe 1 8 and the smoke exhaust pipe 2 936 are connected, so that a part of the smoke is stored in the insulation shell 932. As the high-temperature resistant flexible water-absorbing member 915 absorbs more water, the detection sensor 1 931 detects that the pressure of the active section reaches the second pressure threshold, and the detection sensor 1 931 controls the solenoid valve of the gas injection pipe 927 to open and the solenoid block 921 to open, and then the solenoid block 921 absorbs the magnetic block, and the smoke in the insulation shell 932 is compressed into the cavity under the action of the piston 933 and the elastic member. It should be noted that in actual situations, the controller can be set so that the electric three-way valve 935 will not work when the detection sensor 1 931 detects that the pressure of the active section drops from the second pressure threshold to the first pressure threshold. This setting method belongs to the conventional technology in this field and will not be described in detail here. Of course, it is not limited to this method to achieve it.

[0072] Furthermore, the controller can be arranged on the cooker of the gas stove, and the controller has a display screen, which can set and display working parameters as needed, including: the current fire power of the cooker, the water temperature of the waste heat evaporator, the liquid level status, the start and stop status of the auxiliary heating element 7, the current and cumulative use time of the cooker, and the detection values ​​of various sensors, etc., and can realize the functions of automatic start and stop of the auxiliary heating element 7, water shortage alarm, smoke exhaust over-temperature alarm and auxiliary heating element 7 working protection, and control of the start and stop of some electrical components;

[0073] Furthermore, the outer shell 1, inner shell 2 and other components in the waste heat evaporator of the present invention can adopt heat-insulating materials, and electrical components, such as detection sensor 1 931 and detection sensor 2, can adopt high-temperature resistant materials, which will not be described in detail here.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flue gas waste heat evaporator for a commercial gas stove, which is arranged on the flue of the gas stove and processes the high-temperature flue gas generated by the gas stove, and is characterized by: The waste heat evaporator includes: An outer shell (1) is provided with an inner shell (2) inside, a water jacket (3) for water flow is formed between the outer shell (1) and the inner shell (2), a smoke exhaust pipe (8) penetrating the outer shell (1) is connected to the inner shell (2), a heat exchange tube bundle group is obliquely provided inside the inner shell (2), an auxiliary heating element (7) is provided inside the heat exchange tube bundle group, and a smoke inlet (5) connecting the inner shell (2) and the flue is provided on the outer shell (1); A steam outlet is provided at the top of the housing (1); The triple steam-water separation device (9) is used to remove water from the steam, comprising: A gravity settling chamber (91) formed by the top of the inner shell (2) and the inner wall of the outer shell (1) and through which a smoke exhaust pipe (8) passes; A steam-water separation box (92) is disposed in the gravity settling chamber (91) and located at the steam outlet; The filter assembly is arranged in the steam outlet.

2. The flue gas waste heat evaporator according to claim 1, characterized in that: The inner shell (2) is composed of surrounding side plates and a top plate arranged on the top of the side plates, the top plate is arranged at an angle and immersed below the water level, the heat exchange tube bundle group includes a plurality of groups of small fin tubes (4) and a large fin tube (6) located above the plurality of groups of small fin tubes (4), both ends of the small fin tubes (4) and the large fin tubes (6) pass through the side plates and are connected to the water jacket (3), and the small fin tubes (4) and the large fin tubes (6) are inclined at a certain angle to the horizontal direction, and the heating end of the auxiliary heating element (7) extends into the large fin tube (6).

3. The flue gas waste heat evaporator according to claim 1, characterized in that: A float water replenishment tank (12) is provided on one side of the shell (1), and the float water replenishment tank (12) is connected to the lower part of the water jacket (3) through a pipeline. A liquid level sensor (10) for detecting the height of the water level inside the water jacket (3) is provided on the float water replenishment tank (12). A water temperature sensor (11) for detecting the temperature of the water in the water jacket (3) is provided on the inner wall of the shell (1). A smoke temperature sensor (13) is provided in the smoke exhaust pipe (8). The liquid level sensor (10), the water temperature sensor (11) and the smoke temperature sensor (13) are all connected to a controller, and the controller is electrically connected to the auxiliary heating element (7).

4. The flue gas waste heat evaporator according to claim 1, characterized in that: The steam-water separation box (92) is composed of an inner wall of an outer shell (1) and a folded plate (901) arranged on the inner wall of the outer shell (1); a plurality of groups of small holes (902) are opened on the side of the folded plate (901) facing the smoke exhaust pipe (8); the bottom of the folded plate (901) is inclined at a certain angle to the horizontal direction and corresponds to the area of ​​the water jacket (3) where the higher end of the heat exchange tube bundle is located.

5. The flue gas waste heat evaporator according to claim 1, characterized in that: The filter assembly comprises: A connecting pipe (93) is arranged in the steam outlet; An air intake head (94) is detachably arranged in the connecting pipe (93), and its bottom end is connected to an air intake pipe (95) with a closed bottom. One end of the air intake pipe (95) extends into the steam-water separation box (92). The outer wall of the air intake pipe (95) is provided with a plurality of groups of through holes, and the outer wall is provided with a multi-layer mesh structure (96). The top end of the air intake head (94) is connected to a three-way piece (97), and one end of the three-way piece (97) is connected to a pressure relief valve (98), and the other end is provided with a steam outlet (99).

6. The flue gas waste heat evaporator according to claim 5, characterized in that: The upper end of the air intake pipe (95) is rotatably connected to a carrying ring (911), and the carrying ring (911) is fixed in the bottom end of the air intake head (94). A hollow column (913) is provided in the carrying ring (911), and one end of the hollow column (913) extends to the lower end of the air intake pipe (95). A plurality of assembly rods (914) are symmetrically inserted on both sides of the outer wall of the hollow column (913), and the outer wall of the assembly rod (914) is evenly provided with The first vent hole has an inner cavity of a mounting rod (914) provided with a high temperature resistant flexible water absorbing member (915); the steam outlet (99) has an impeller member (910) provided inside; one end of the shaft of the impeller member (910) extends into the air inlet pipe (95) and is transmission-connected to the air inlet pipe (95) through a gear set (912); when the impeller member (910) is driven to rotate by steam, the air inlet pipe (95) is driven to rotate through the gear set (912).

7. The flue gas waste heat evaporator according to claim 6, characterized in that: The outer wall of the assembly rod (914) is movably sleeved with a sleeve (929), and the outer wall of the sleeve (929) is evenly provided with two ventilation holes. The sleeve (929) is driven to rotate by a gear member (934) inserted into the outer wall of the hollow column (913). The gear member (934) is meshed with a rack (917), and the rack (917) is connected to the bottom wall of the hollow column (913) through an elastic connecting rod (916). The rack (917) drives the gear member (934) upward to drive the sleeve (929) ) is rotated so that the second through hole and the first through hole are offset, the top of the elastic connecting rod (916) is rotatably connected to a movable column (918), the outer wall of the movable column (918) is rotatably sleeved with a magnetic block, and an electromagnetic block (921) is arranged above the magnetic block at a distance for electrically adsorbing the magnetic block to drive the movable column (918) upward, the electromagnetic block (921) is arranged at the bottom of the hollow block (920), and the hollow block (920) is connected to the carrying ring (911) and the hollow column (913).

8. The flue gas waste heat evaporator according to claim 7, characterized in that: The cavity of the hollow block (920) is rotatably provided with an impeller component 2 (925) whose shaft end corresponds to the movable column (918); the shaft of the impeller component 2 (925) is provided with a docking groove; one end of the movable column (918) is provided with a docking block (919); the cavity is connected to an air injection pipe (927) and an air outlet pipe (928); one end of the air injection pipe (927) is connected to a heat preservation shell (932); the air outlet pipe (928) is connected to the hollow column (913); the hollow block (920) An exhaust pipe (926) is also inserted thereon, one end of the exhaust pipe (926) is connected to the inner cavity of the hollow column (913), and the other end is connected to the second smoke exhaust pipe (936), the second smoke exhaust pipe (936) is connected to an electric three-way valve (935), the electric three-way valve (935) is connected to the insulation shell (932) and the first smoke exhaust pipe (8), the gas injection pipe (927) and the exhaust pipe (926) are both provided with solenoid valves, and the insulation shell (932) is connected to a corresponding piston (933) via an elastic member.

9. The flue gas waste heat evaporator according to claim 7, characterized in that: The outer wall of the movable column (918) is slidably sleeved with a plurality of groups of push blocks (922), and the push blocks (922) are also rotatably arranged on a bracket fixed on the inner wall of the hollow column (913). The outer wall of the push block (922) is provided with a slide groove adapted to its outer contour, and a movable connecting rod (923) is movably embedded on both sides of the slide groove. The opposite ends of the movable connecting rods (923) on both sides extend into the assembly rods (914) on both sides respectively and are connected to the perforated pressure plate (924). When the movable column (918) rotates, the push block (922) drives the movable connecting rod (923) to drive the perforated pressure plate (924) to squeeze the high-temperature resistant flexible water-absorbing component (915) in the assembly rod (914).

10. The flue gas waste heat evaporator according to claim 8, characterized in that: The hollow column (913) comprises an elastic telescopic rod, the bottom of the movable section of the elastic telescopic rod is in contact with a detection sensor 1 (931) provided on a connection seat (930), the connection seat (930) is movably inserted at the bottom of the air intake pipe (95) and connected to the steam-water separation box (92), a detection sensor 2 for detecting the piston (933) is provided below the inner wall of the heat-insulating shell (932), the detection sensor 1 (931) and the detection sensor 2 are both electrically connected to a controller, and when the detection sensor 1 (931) detects that the movable section of the elastic telescopic rod reaches a first pressure threshold and a second pressure threshold, the controller controls the electric three-way valve (935) and the electromagnetic valve and the electromagnetic block (921) in the air injection pipe (927), respectively, and when the detection sensor 2 detects the piston (933), the controller controls the electric three-way valve (935).

Images