A flue gas waste heat evaporator for a commercial gas stove

Abstract

The present invention discloses a flue gas waste heat evaporator for a commercial gas stove. The waste heat evaporator includes: a housing, an inner housing is provided inside the housing, a water jacket for water flow is formed between the housing and the inner housing, a first exhaust pipe penetrating the housing is communicated with the inner housing, a heat exchange tube bundle group is obliquely arranged inside the inner housing, and an auxiliary heating element is arranged inside the heat exchange tube bundle group; a steam outlet is arranged at the top of the housing; a triple steam-water separation device. In the present invention, the housing and the inner housing form a water jacket, the high-temperature flue gas is wrapped inside the inner housing, the heat exchange surface of the waste heat evaporator is expanded, and at the same time, the heat dissipation of the high-temperature flue gas to the outside is avoided. 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 top plate of the inner housing, the fluidity of water in the evaporator is increased, and thus the heat transfer effect is strengthened. In addition, fins are adopted on the flue gas side to expand the heat exchange area, and the waste heat recovery efficiency is high.

Description

Technical Field

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

[0002] Currently, when a commercial gas stove is in use, the high-temperature flue gas generated is usually discharged into the kitchen environment through a flue and then forcibly discharged into the outdoor atmosphere through an exhaust and ventilation system. This method has the following defects:

[0003] 1. There is a large amount of heat energy in the high-temperature flue gas. Direct discharge not only poses a fire hazard but also makes the kitchen space humid and hot, resulting in a poor working environment for cooking staff. In addition, it increases the burden on exhaust and ventilation equipment and air conditioning equipment.

[0004] 2. The waste heat of the high-temperature flue gas cannot be well recovered and utilized. Most of it is used to prepare hot water through high-temperature flue gas and a small amount of products are used to prepare boiling water. It is not convenient to generate steam through waste heat recovery to independently meet the steam demand. When steaming food with steam, other steam equipment is often needed for supplementation, increasing energy consumption. Although some can recover the waste heat of high-temperature flue gas to generate steam, the moisture content of the steam is generally high, resulting in a reduction in the efficiency and quality of steaming food.

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

[0006] The purpose 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 art.

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

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

[0009] A housing, inside which an inner housing is provided. A water jacket for water flow is formed between the housing and the inner housing. A first exhaust pipe penetrating the housing is connected to the inner housing. A heat exchange tube bundle group is inclined in the inner housing. An auxiliary heating element is provided in the heat exchange tube bundle group. An air inlet connecting the inner housing and the flue is provided on the housing;

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

[0011] A triple steam-water separation device for removing moisture in the steam, including:

[0012] A gravity settling chamber formed by the top of the inner housing and the inner wall of the housing and through which the first exhaust pipe passes;

[0013] The 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 side panels on all sides and a top panel provided on the top of the side panels. The top panel is tilted and immersed below the water level. The heat exchange tube bundle group includes several groups of small finned tubes and a large finned tube located above the several groups of small finned tubes. Both ends of the small finned tubes and the large finned tubes pass through the side panels and are connected to the water jacket. The small finned tubes and the large finned tubes are both inclined at a certain angle to the horizontal direction. The heating end of the auxiliary heating element extends into the large finned tube.

[0016] A further improvement is that a float water replenishing tank is provided on one side of the outer shell, and the float water replenishing tank is connected to the lower part of the water jacket through a pipeline. The float water replenishing 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 flue gas temperature sensor is provided in the smoke exhaust pipe. The liquid level sensor, water temperature sensor and flue gas 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 the inner wall of the 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. The bottom of the folded plate is inclined at a certain angle to the horizontal direction and corresponds to the water jacket area at the higher end of the heat exchange tube bundle.

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

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

[0020] The air intake head is detachably arranged in the connecting pipe, and its bottom end is connected to 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 several groups of through holes, and its outer wall is covered with a multi-layer mesh structure. The top of the air intake head is connected to a tee, and one end of the tee is connected to a pressure relief valve, and the other end is provided with a steam exhaust outlet.

[0021] A further improvement is that the upper end of the air intake pipe is rotatably connected to the carrying ring, the carrying ring is fixed in the bottom end of the air intake head, a hollow column is provided in the carrying ring, one end of the hollow column extends to the lower end of the air intake pipe, and a number of assembly rods are symmetrically inserted on both sides of the outer wall of the hollow column, and the outer wall of the assembly rod is evenly provided with air vents, and the inner cavity of the assembly rod is provided with a high-temperature resistant flexible water-absorbing part, and an impeller component is provided in the steam exhaust port, one end of the shaft of the impeller component extends into the air intake pipe and is connected to the air intake pipe through a gear set, and 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 lies in that a sleeve is movably sleeved on the outer wall of the assembly rod. Ventilation holes II are evenly formed in the outer wall of the sleeve. The sleeve is driven to rotate by a gear member inserted on the outer wall of the hollow column. The gear member meshes with a rack. The rack is connected to the bottom wall of the hollow column through an elastic connecting rod. The rack drives the gear member upward to drive the sleeve to rotate, so that through hole II and through hole I are staggered. The top of the elastic connecting rod is rotatably connected with a movable column. 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 and is used for adsorbing the magnetic block by electrifying to drive the movable column upward. The electromagnetic block is arranged at the bottom of the hollow block. The hollow block is connected to the bearing ring and the hollow column.

[0023] A further improvement lies in that an impeller member II with one end of the shaft corresponding to the movable column is rotatably arranged in the cavity of the hollow block. A docking groove is formed in the shaft of the impeller member II. One end of the movable column is provided with a docking block. The cavity communicates with an injection pipe and an outlet pipe. One end of the injection pipe communicates with the heat preservation shell. The outlet pipe communicates with the hollow column. An exhaust pipe is also inserted on the hollow block. One end of the exhaust pipe communicates with the inner cavity of the hollow column and the other end communicates with exhaust pipe II. Exhaust pipe II communicates with an electric three-way valve. The electric three-way valve communicates with the heat preservation shell and exhaust pipe I. Solenoid valves are arranged in both the injection pipe and the exhaust pipe. A piston adapted thereto is connected in the heat preservation shell through an elastic member.

[0024] A further improvement lies in that a plurality of groups of jacking blocks are slidably sleeved on the outer wall of the movable column. The jacking blocks are also rotatably arranged on a bracket fixed on the inner wall of the hollow column. A sliding groove adapted to its outer contour is formed in the outer wall of the jacking block. An activity connecting rod is movably embedded on both sides of the sliding groove. The opposite ends of the activity connecting rods on both sides respectively extend into the two assembly rods and are connected to a perforated pressing plate. When the movable column rotates, the jacking blocks drive the activity connecting rods to drive the perforated pressing plate to extrude the high-temperature resistant flexible water absorbent member in the assembly rod.

[0025] A further improvement lies in that the hollow column includes an elastic telescopic rod. The bottom of the movable section of the elastic telescopic rod abuts against a detection sensor I arranged on a connecting seat. The connecting seat is movably inserted at the bottom of the air inlet pipe and is connected to the steam-water separation box. A detection sensor II for detecting the piston is arranged below the inner wall of the heat preservation shell. Both detection sensor I and detection sensor II are electrically connected to a controller. When detection sensor I detects that the movable section of the elastic telescopic rod reaches the first pressure threshold and the second pressure threshold, it controls the electric three-way valve, the solenoid valve in the injection pipe and the electromagnetic block through the controller respectively. When detection sensor II detects the piston, it controls the electric three-way valve through the controller.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1) The outer shell and inner shell of the present invention form a water jacket, enclosing the high-temperature flue gas within the inner shell, expanding the heat exchange surface of the waste heat evaporator while preventing the high-temperature flue gas from dissipating heat to the outside. The inclined design of the heat exchange tube bundle and the inner shell top plate utilizes the natural temperature difference cycle in the heat exchange structure, increasing the fluidity of water in the evaporator and thus enhancing the heat transfer effect. In addition, the use of flue gas side fins to expand the heat exchange area can achieve the expected waste heat recovery efficiency with fewer fin tubes and a 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, achieving high waste heat recovery efficiency.

[0028] 2) The introduction of the auxiliary heating element and its automatic start-stop control solves the problem of asynchronous operation of the stove and steam-using equipment, which affects normal cooking. Furthermore, the auxiliary heating element is placed in the high-temperature water area within the housing, which always maximizes steam output with less auxiliary energy and achieves a continuous and stable steam supply. By appropriately pressurizing the steam within the waste heat evaporator, the temperature control range is expanded, facilitating precise temperature control of the auxiliary heating and enabling precise control of the introduction and withdrawal of the auxiliary heating.

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

[0030] 4) When steam is discharged from the steam outlet, the filter assembly of the present invention rotates the intake pipe via the impeller member 1 and the gear set. The centrifugal force generated by the rotation of the intake pipe not only enhances the disturbance effect of the steam, but also makes the separation of water and steam more thorough. It also prevents the water at the separation point from adhering to the multi-layer mesh structure on the outer wall of the intake pipe and affecting the entry of steam. Moreover, after entering the intake pipe, the steam more evenly contacts the high-temperature resistant flexible water-absorbing member on the outer wall of the hollow column, thereby further improving the removal of water from the steam through the high-temperature resistant flexible water-absorbing member.

[0031] 5) When the high-temperature resistant flexible water-absorbing member of the present invention adsorbs a certain amount of water, it can drive the sleeve to rotate, so that steam will no longer enter the assembly rod and contact the high-temperature resistant flexible water-absorbing member. At the same time, the exhausted flue gas is injected into the hollow column, and the heat of the exhausted flue gas is used to heat-treat the high-temperature resistant flexible water-absorbing member to make it recycled. And when the flue gas enters the hollow column, the high-temperature resistant flexible water-absorbing member is reciprocally extruded, thereby accelerating the desorption and evaporation of water, improving the regeneration efficiency of the high-temperature resistant flexible water-absorbing member, so as to ensure the water-absorbing quality of the high-temperature resistant flexible water-absorbing member and ensure its high-efficient water-absorbing ability in subsequent use.

[0032] 6) The flue gas waste heat evaporator of the present invention can be integrated into the gas cooking appliance itself without increasing or changing the external shape structure size of the cooking appliance, improving the space utilization rate, making the equipment compact and occupying less land. And the waste heat evaporator of the present invention is installed on the flue, and all the high-temperature waste heat of the flue gas is recycled under the premise of not affecting the use effect of the stove and not reducing the self-thermal efficiency of the stove, producing steam to supply the kitchen to replace the energy consumption of the original steaming box and other equipment, with significant energy conservation and emission reduction benefits; BRIEF DESCRIPTION OF THE DRAWINGS

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

[0034] Figure 2 For the present invention Figure 1 Partial structure side view;

[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 structural diagram of the air inlet pipe of the present invention;

[0037] Figure 5 For the present invention Figure 4 Partial structure top view;

[0038] Figure 6 For the present invention Figure 4 Structural sectional view;

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

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

[0041] Figure 9 For the present invention Figure 6 Partial structure schematic diagram in;

[0042] Figure 10Schematic diagram of the waste heat evaporator of the present invention connected to a gas stove.

[0043] In the figure: 1, outer shell; 2, inner shell; 3, water jacket; 4, small finned tube; 5, smoke inlet; 6, large finned tube; 7, auxiliary heating element; 8, exhaust pipe 1; 9, triple steam-water separation device; 91, gravity sedimentation chamber; 92, steam-water separation box; 901, folding plate; 902, small hole; 93, connecting pipe; 94, intake head; 95, intake pipe; 96, multi-layer mesh structure; 97, three-way piece; 98, pressure relief valve; 99, steam discharge port; 910, impeller part 1; 911, bearing ring; 912, gear set; 913, hollow column; 914, assembly rod; 915, high-temperature resistant flexible water absorption part; 916, elastic connecting rod; 917, rack; 918, movable column; 919, docking block; 920, hollow block; 921, electromagnetic block; 922, pushing block; 923, movable connecting rod; 924, perforated pressure plate; 925, impeller part 2; 926, exhaust pipe; 927, injection pipe; 928, outlet pipe; 929, sleeve; 930, connecting seat; 931, detection sensor 1; 932, heat preservation 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 replenishing tank; 13, flue gas temperature sensor. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0045] Embodiment 1

[0046] Please refer to the attached drawings - attached Figure 3 and attached Figure 10 In the drawings, a is the furnace of the gas stove, b is the flue of the gas stove, and c is the rear back top plate of the gas stove; Figure 10

[0047] A flue gas waste heat evaporator for a commercial gas stove is installed on the flue of the gas stove to treat 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. The high-temperature flue gas generated by the combustion of gas during cooking passes from the furnace a through the flue b and then is discharged from the rear near the top plate c. This flue gas waste heat evaporator is installed on the flue b of the gas stove. The heat energy of the high-temperature flue gas is absorbed by water in the flue gas waste heat evaporator to generate steam for the needs of the kitchen. Preferably, a fully enclosed furnace can be adopted. The fully enclosed furnace is used to reduce the leakage of flue gas at the pot ring opening, and all the high-temperature flue gas in the furnace is passed through the flue b and then through the waste heat evaporator for waste heat recycling, so as to obtain a higher energy utilization efficiency. Compared with traditional stoves, the energy utilization efficiency is increased by more than 50%. It can be integrated into the gas stove equipment itself without increasing or changing the external shape and structure size of the stove, improving the space utilization rate, making the equipment compact and occupying less land. And it is installed on the flue, and all the high-temperature waste heat of the flue gas is recycled under the premise of not affecting the use effect of the stove and not reducing the thermal efficiency of the stove itself. The generated steam is used to supply the kitchen to replace the energy consumption of the original steam box and other equipment, with significant energy conservation and emission reduction benefits.

[0048] This waste heat evaporator includes:

[0049] A housing 1, inside which there is an inner housing 2. Both the inner housing 2 and the housing 1 have a rectangular cross-section. And a plurality of tie rods are welded between the inner housing 2 and the housing 1 for reinforcement so that it can remain unchanged under a certain pressure. A water jacket 3 for water flow is formed between the housing 1 and the inner housing 2. The top of the inner housing 2 is connected to a smoke exhaust pipe 1 penetrating through the top of the housing 1. An inclined heat exchange tube bundle group is arranged inside the inner housing 2. An auxiliary heating element 7 (such as an electric heating tube) is arranged inside the heat exchange tube bundle group. The bottom of the housing 1 is provided with a smoke inlet 5 connecting the inner housing 2 and the flue. The bottom of the housing 1 also has a sewage outlet. Heat preservation materials can be laid outside the housing 1;

[0050] Further, the inner housing 2 is composed of four surrounding side plates and a top plate arranged at the top of the side plates. The top plate is inclined and immersed below the water level line. The heat exchange tube bundle group includes several groups of small finned tubes 4 arranged in parallel up and down and in a staggered distribution, and a large finned tube 6 above several groups of small finned tubes 4. The large finned tube 6 is specifically located at a position with a higher water level in the water jacket 3. The inner diameter of the large finned tube 6 is larger than that of the small finned tubes 4. The two ends of the small finned tubes 4 and the large finned tube 6 penetrate through the side plates and are connected to the water jacket 3, and both the small finned tubes 4 and the large finned tube 6 are inclined at a certain angle with the horizontal direction. From the appendix Figure 1It can be seen that the left ends of the small finned tubes 4 and the large finned tubes 6 are higher than their right ends, and the heating end of the auxiliary heating element 7 extends into the large finned tube 6; the inner wall of the inner shell 2, the top plate, the small finned tubes 4, and the large finned tubes 6 where the auxiliary heating element 7 is installed together form a heat exchange surface with the high-temperature flue gas. A natural circulation loop with a temperature difference is formed between the top plate of the inclined inner shell 2, the small finned tubes 4 with a flow inclination angle, and the large finned tubes 6. Moreover, the large finned tubes 6 are arranged in the upper high-temperature area of the water. The auxiliary heating element 7 always further heats and vaporizes the boiling or nearly boiling high-temperature hot water. In various situations such as when the stove is used on high heat, low heat, or not used temporarily, steam can be continuously and stably generated, and the auxiliary heating energy consumption can be reduced;

[0051] Furthermore, a float ball water replenishing tank 12 is provided on one side of the outer shell 1, and it is also connected to the lower part of the water jacket 3 through a pipeline. The water inlet of the float ball water replenishing tank 12 is connected to a water source. The float ball water replenishing tank 12 usually has a water inlet and can be directly connected to an external water source (such as a tap water pipe, a water pump, or other water supply systems). When the float ball water replenishing tank 12 is in use, when the water level in the tank drops, the float ball sinks, driving the connecting rod to open the water inlet valve, and the external water source starts to replenish water into the tank. When the water level rises to the set height, the float ball floats, driving the connecting rod to close the water inlet valve and stop replenishing water. This belongs to the prior art and will not be described in detail here. A liquid level sensor 10 for detecting the water level height inside the water jacket 3 is provided on the float ball water replenishing tank 12, playing a dual guarantee role. Specifically, it is located below the float ball of the float ball water replenishing tank 12. A water temperature sensor 11 for detecting the water temperature inside the water jacket 3 is provided on the inner wall of the outer shell 1. A flue gas temperature sensor 13 is provided in the first flue pipe 8. The liquid level sensor 10, the water temperature sensor 11, and the flue gas temperature sensor 13 are all connected to a 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 working. When the liquid level is in a normal state, after pressing the automatic start-stop switch button, the auxiliary heating element 7 starts and stops automatically around the set water temperature control signal inside the waste heat evaporator. When the flue gas temperature sensor 13 detects that the flue gas temperature value exceeds the set temperature, the controller can emit a prompt sound and flash a light on the display screen to remind;

[0052] The steam outlet is provided at the top of the outer shell 1;

[0053] A triple steam-water separation device 9 is used to remove moisture in the steam and includes:

[0054] A gravity sedimentation chamber 91 is formed by the top of the inner shell 2 and the top wall of the outer shell 1 and allows the first flue pipe 8 to pass through. It is on the steam flow path, and the steam undergoes gravity sedimentation through the gravity sedimentation chamber 91;

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

[0056] Furthermore, the steam-water separation box 92 is composed of three sides of the inner wall of the outer shell 1 and the "L"-shaped folding plate 901. A number of groups of small holes 902 are opened on the side of the folding plate 901 facing the first exhaust pipe 8. The bottom of the folding plate 901 forms a certain inclination angle with the horizontal direction. As can be seen from the appendix Figure 1 The left end of the bottom of the folding plate 901 is higher than the right end of its bottom and corresponds to the water jacket 3 area where the higher end of the heat exchange tube bundle group is located. During use, the high-temperature steam-water mixture (steam) flows vertically upward from the lower end to the higher end along the tube orifices of the heat exchange tube bundle group and impacts the bottom of the folding plate 901. Some of the moisture in the high-temperature steam-water mixture (steam) is flushed back into the water below. At the same time, the flow direction of the high-temperature steam-water mixture (steam) turns by 90° and enters the gravity settling chamber 91 horizontally. In the gravity settling chamber 91, the flow rate of the high-temperature steam-water mixture (steam) drops sharply, and the moisture carried by the steam settles to the lower water due to gravity. And because the first 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, then makes a 180° turn-back and passes through the small holes 902 on the side of the folding plate 901. The moisture carried by the steam is blocked and separated again and falls below. The steam passes through the steam-water separation box 92 and flows towards the steam outlet;

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

[0058] Embodiment 2

[0059] Please refer to the appendix Figure 3 , on the basis of Embodiment 1, the filter screen assembly of this embodiment includes:

[0060] The connecting pipe 93 is arranged inside the steam outlet. The connecting pipe 93 is an internally threaded connecting pipe, and it is threadedly connected to the steam outlet;

[0061] The intake head 94 is detachably arranged in the connecting pipe 93, and the two can be connected by means of threaded connection. The bottom end of the intake head 94 is communicated with an intake pipe 95 with a closed bottom. The outer diameter of the intake pipe 95 is smaller than the inner diameter of the connecting pipe 93. One end of the intake pipe 95 extends into the steam-water separation box 92. A plurality of groups of through holes are formed in the outer wall of the intake pipe 95, and a multi-layer mesh structure 96 is sleeved on the outer wall of the intake pipe 95 in a clamping manner. The multi-layer mesh structure 96 is, for example, a multi-layer stainless steel wire mesh. Specifically, clamping grooves are formed at both the upper and lower ends of the outer wall of the intake pipe 95, and the multi-layer mesh structure 96 is fixed on the clamping grooves by a snap ring. The top end of the intake head 94 is communicated with a tee 97, and one end of the tee 97 is connected with a pressure relief valve 98, and the other end is provided with a steam discharge port 99. The steam entering the steam-water separation box 92 passes through the multi-layer mesh structure 96 and the through holes and then enters the intake pipe 95. The moisture in the steam is further removed through the multi-layer mesh structure 96 and the through holes. Subsequently, the steam can be discharged through the intake head 94, the tee 97 and the steam discharge port 99.

[0062] Embodiment 3

[0063] Please refer to the appendix Figure 4 - appendix Figure 9913 is fixed to the bottom end of the air inlet head 94, and a hollow column 913 is provided in the carrying ring 911. The hollow column 913 and the air inlet pipe 95 are on the same axis. The top and inner cavity of the hollow column 913 are hollow. One end of the hollow column 913 extends to the lower end of the air inlet pipe 95. A plurality 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. The outer wall of the assembly rod 914 is evenly provided with air vents 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 be made of high-temperature resistant silicone sponge. The high-temperature resistant silicone sponge will not be damaged by the steam temperature on the one hand, and can absorb moisture in the steam when the steam flows, thereby further improving the quality of steam-water separation. The steam outlet 99 is provided with an impeller member 910. The impeller Component 1 910 is composed of an impeller and a shaft. One end of the shaft of impeller component 1 910 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 a driving gear provided on the shaft of impeller component 1 910 and meshing with the gear ring (or tooth groove). When the impeller component 1 910 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, so that the separation of water and steam is more thorough, but also the water at the separation point is not easily attached to the multi-layer mesh structure 96 and affects the entry of steam into the air inlet pipe 95. In addition, after entering the air inlet pipe 95, the steam contacts the high-temperature resistant flexible water-absorbing component 915 more evenly, so that the water in the steam is better absorbed by the high-temperature resistant flexible water-absorbing component 915.

[0064] Preferably, a sleeve 929 is movably sleeved on the outer wall of the assembly rod 914 in this embodiment. The outer wall of the sleeve 929 is evenly provided with second vent holes for communicating with the first vent holes. The sleeve 929 is driven to rotate by a gear member 934 inserted on 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 tooth grooves 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. The bottom of the rack 917 is connected to the bottom wall of the hollow column 913 through an elastic connecting rod 916 (such as an elastic telescopic rod). The top of the elastic connecting rod 916 is rotatably connected to a movable column 918 through a bearing. The outer wall of the other end of the movable column 918 is rotatably sleeved with a magnetic block. An electromagnetic block 921 is arranged at a distance above the magnetic block. The electromagnetic block 921 is arranged at the bottom of the hollow block 920. One end of the hollow block 920 is connected to the inner wall of the bearing ring 911. The hollow block 920 is also connected to one end of the hollow column 913. When the electromagnetic block 921 adsorbs the magnetic block when it is electrified, the elastic connecting rod 916 and the rack 917 are driven to move upward through the movable column 918. The upward movement of the rack 917 drives the gear member 934 to drive the sleeve 929 to rotate, so that the second through hole and the first through hole are staggered, and thus the high-temperature resistant flexible water-absorbing member 915 no longer absorbs water or discharges water into the discharged steam.

[0065] Preferably, a cavity is formed in the hollow block 920 of this embodiment. An impeller member II 925 is rotatably arranged in the cavity. Similar to the above-mentioned impeller member I 910, one end of the shaft portion of the impeller member II 925 penetrates through the hollow block 920 and corresponds to the movable column 918. A docking groove is formed in the shaft portion of the impeller member II 925. One end of the movable column 918 is provided with a docking block 919 that is 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 can be rectangular or polygonal. After the docking block 919 enters the docking groove, the impeller member II 925 can drive the movable column 918 to rotate when rotating. The cavity is communicated with an air injection pipe 927 and an air outlet pipe 928. One end of the air injection pipe 927 penetrates through the hollow block 920 and the air inlet head 94 and is communicated with the heat preservation shell 932. The heat preservation shell 932 is made of heat preservation materials and will not be elaborated here. The air outlet pipe 928 is communicated with the inner cavity of the hollow column 913. An exhaust pipe 926 is also inserted on the hollow block 920. One end of the exhaust pipe 926 is communicated with the inner cavity of the hollow column 913, and the other end penetrates through the hollow block 920 and the air inlet head 94 and is communicated with the second exhaust pipe 936. The second exhaust pipe 936 is arranged at an output end of the electric three-way valve 935. The other output end of the electric three-way valve 935 is communicated with the heat preservation shell 932 through a connecting pipeline. The input end of the electric three-way valve 935 is communicated with the first 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 first exhaust pipe 8 can be communicated with the connecting pipeline, so that the flue gas discharged from the first exhaust pipe 8 enters the connecting pipeline and then enters the heat preservation shell 932, and will not enter the second exhaust pipe 936. Similarly, when the electric three-way valve 935 is closed, the first exhaust pipe 8 can be communicated with the second exhaust pipe 936, so that the flue gas discharged from the first exhaust pipe 8 enters the second exhaust pipe 936 and is discharged through the second exhaust pipe 936. In actual situations, the second exhaust pipe 936 penetrates through the rear support top plate c. Solenoid valves are arranged in both the air injection pipe 927 and the exhaust pipe 926. A piston 933 adapted thereto is connected in the heat preservation shell 932 through an elastic member (such as a spring).

[0066] As a preferred embodiment, the outer wall sliding sleeve of the movable column 918 of this embodiment is provided with several 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 provided 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, with a movable connecting rod 923 movably embedded on both sides of the slide, the vertical cross-section of the end of the movable connecting rod 923 is T-shaped and adapted to the slide, so that it is not easy to separate from the slide, 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, and 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 extrude the high-temperature resistant flexible water-absorbing component 915 when the movable column 918 rotates.

[0067] After the high-temperature resistant flexible water-absorbing member 915 has been used for a period of time, the user can turn on the electromagnetic block 921. At this time, the electromagnetic block 921 attracts 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. 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, and then the steam cannot pass through the through hole 1 and the through hole 2 to contact the high-temperature resistant flexible water-absorbing member 915. At the same time, the movable column 918 drives the docking block 919 to enter the docking groove and opens the electric three-way valve 935. At this time, the flue gas with a certain temperature discharged from the exhaust pipe 8 (the flue gas is usually reduced to below 150°C after heat exchange) 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 by the elastic member, driving the impeller member 925 to rotate, and at the same time, it is discharged from the gas outlet pipe 928 into the hollow column 913. The flue gas with a certain temperature flows in the hollow column 913 and contacts the high-temperature resistant flexible water-absorbing member 915, heating the high-temperature resistant flexible water-absorbing member 915, regenerating it for recycling. In addition, 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, so that the perforated pressure plate 924 reciprocates and squeezes the high-temperature resistant flexible water-absorbing member 915 in the assembly rod 914, squeezing 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 electromagnet block 921 is closed, so that the flue gas flowing in the hollow column 913 is discharged through the exhaust pipe 926 and the second exhaust pipe 936. In actual situations, filters can be provided in the injection pipe 927 and the exhaust pipe 926 to filter the flue gas. After the electromagnet block 921 is closed, the elastic connecting rod 916 drives the movable column 918 and the rack 917 to reset downward. Then, the sleeve 929 rotates, so that the second through hole and the first through hole correspond to each other again.

[0069] Embodiment 4

[0070] Please refer to the appendix Figure 6 , on the basis of Embodiment 3, the hollow column 913 includes an elastic telescopic rod. The elastic telescopic rod includes a fixed section with one end connected to the hollow block 920, 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 in contact with the first detection sensor 931 is embedded at the bottom of the movable section. The first detection sensor 931 is arranged on the connecting seat 930. The connecting seat 930 is movably inserted into the center of the bottom of the intake pipe 95, and one end of it is connected to the inner wall of the steam-water separation box 92. A second detection sensor is arranged on the inner wall of the heat preservation shell 932. The second detection sensor contacts the piston 933 when the piston 933 moves downward to a preset position. Both the first detection sensor 931 and the second detection sensor are electrically connected to the controller. When the first detection sensor 931 detects that the movable section reaches the first pressure threshold and the second pressure threshold, it controls the electric three-way valve 935, the solenoid valve in the injection pipe 927, and the electromagnet block 921 through the controller respectively. When the second detection sensor detects the piston 933, it controls the electric three-way valve 935 through the controller;

[0071] Both the above-mentioned detection sensor 1 931 and detection sensor 2 can adopt pressure sensors. During actual use, the pressure thresholds of detection sensor 1 931 and detection sensor 2 can be set to control the corresponding electrical components to work (for example, realized through a logic control circuit or a programming controller (such as a PLC or a single-chip microcomputer)). The above-mentioned first pressure threshold < the second pressure threshold. When the high-temperature resistant flexible water-absorbing member 915 gradually absorbs water, it will cause the movable section to move relative to the fixed section. When detection sensor 1 931 detects that the pressure of the movable section reaches the first pressure threshold, detection sensor 1 931 sends a signal to the controller, causing the controller to control the electric three-way valve 935 to open, and then the smoke exhaust pipe 1 8 and the connecting pipeline are connected. At this time, the flue gas discharged from the smoke exhaust pipe 1 8 enters the heat preservation shell 932 to drive the piston 933 to move. When detection sensor 2 detects the piston 933, it controls the electric three-way valve 935 to close, so that the smoke exhaust pipe 1 8 and the smoke exhaust pipe 2 936 are connected. In this way, a part of the flue gas is stored in the heat preservation shell 932. As the high-temperature resistant flexible water-absorbing member 915 absorbs more water, when detection sensor 1 931 detects that the pressure of the movable section reaches the second pressure threshold, detection sensor 1 931 controls the solenoid valve of the injection pipe 927 to open and the electromagnet 921 to open. Then, the electromagnet 921 adsorbs the magnetic block, and the flue gas in the heat preservation 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, it can be set that when detection sensor 1 931 detects that the pressure of the movable section drops from the second pressure threshold to the first pressure threshold, the controller will not cause the electric three-way valve 935 to work. This setting method belongs to the conventional technology in this field and will not be elaborated here. Of course, it is not limited to this one way to achieve it.

[0072] Furthermore, the controller can be arranged on the cooking appliance of the gas stove. The controller is equipped with a display screen and can set and display working parameters as needed, including: the current firepower of the current cooking appliance, the water temperature of the waste heat evaporator, the liquid level status, the start / stop status of the auxiliary heating member 7, the current and cumulative usage duration of the cooking appliance, and the detection values of each sensor, etc. It can realize functions such as automatic start / stop of the auxiliary heating member 7, water shortage alarm, smoke exhaust over-temperature alarm, protection of the auxiliary heating member 7 during operation, and control of the opening and closing of some electrical components;

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

[0074] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. 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 in that: The waste heat evaporator includes: A housing (1) with an inner housing (2) provided inside. A water jacket (3) for water flow is formed between the housing (1) and the inner housing (2). A first smoke exhaust pipe (8) penetrating through the housing (1) is communicated with the inner housing (2). A heat exchange tube bundle group is inclinedly arranged inside the inner housing (2), and an auxiliary heating element (7) is arranged inside the heat exchange tube bundle group. A smoke inlet (5) communicating the inner housing (2) and the flue is provided on the housing (1); A steam outlet, provided at the top of the housing (1); A triple steam-water separation device (9) for removing moisture in the steam, including: A gravity settling chamber (91), formed by the top of the inner housing (2) and the inner wall of the housing (1) and allowing the first smoke exhaust pipe (8) to pass through; A steam-water separation box (92), arranged inside the gravity settling chamber (91) and located at the steam outlet; A filter screen assembly, arranged inside the steam outlet; The filter screen assembly includes: A connecting pipe (93), arranged inside the steam outlet; An air inlet head (94), detachably arranged inside the connecting pipe (93). The bottom end thereof is communicated with an air inlet pipe (95) with a closed bottom. One end of the air inlet pipe (95) extends into the steam-water separation box (92). A plurality of groups of through holes are formed on the outer wall of the air inlet pipe (95), and a multi-layer mesh structure (96) is sleeved on the outer wall thereof. The top end of the air inlet head (94) is communicated with a tee joint (97). One end of the tee joint (97) is connected with a pressure relief valve (98), and the other end is provided with a steam discharge port (99); The upper end of the air inlet pipe (95) is rotatably connected with a bearing ring (911). The bearing ring (911) is fixed inside the bottom end of the air inlet head (94). A hollow column (913) is arranged inside the bearing ring (911). One end of the hollow column (913) extends to the lower end inside the air inlet pipe (95). A plurality of groups of assembly rods (914) are symmetrically inserted on both sides of the outer wall of the hollow column (913). A first ventilation hole is uniformly formed on the outer wall of the assembly rod (914). A high-temperature resistant flexible water absorption element (915) is arranged inside the cavity of the assembly rod (914). An impeller part one (910) is arranged inside the steam discharge port (99). One end of the shaft part of the impeller part one (910) extends into the air inlet pipe (95) and is in transmission connection with the air inlet pipe (95) through a gear set (912). When the impeller part one (910) is driven to rotate by the steam, the air inlet pipe (95) is driven to rotate through the gear set (912).

2. The flue gas waste heat evaporator according to claim 1, wherein: The inner housing (2) is composed of four peripheral side plates and a top plate arranged at the top of the side plates. The top plate is inclined and immersed below the water level line. The heat exchange tube bundle group includes a plurality of groups of small finned tubes (4) and a large finned tube (6) above the plurality of groups of small finned tubes (4). Both ends of the small finned tubes (4) and the large finned tube (6) penetrate through the side plates and are communicated with the water jacket (3). Both the small finned tubes (4) and the large finned tube (6) are inclined at a certain angle with the horizontal direction. The heating end of the auxiliary heating element (7) extends into the large finned tube (6).

3. The flue gas waste heat evaporator according to claim 1, characterized in that: A float water supply tank (12) is provided on one side of the housing (1), and the float water supply 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 supply 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 housing (1). A flue gas temperature sensor (13) is provided in the exhaust pipe (8). The liquid level sensor (10), the water temperature sensor (11) and the flue gas 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, wherein: The steam-water separation box (92) is composed of the inner wall of the outer shell (1) and a folded plate (901) arranged on the inner wall of the outer shell (1). The folded plate (901) is provided with a plurality of groups of small holes (902) on the side facing the exhaust pipe (8). The bottom of the folded plate (901) is inclined at a certain angle to the horizontal direction and corresponds to the water jacket (3) area where the higher end of the heat exchange tube bundle is located.

5. The flue gas waste heat evaporator according to claim 1, wherein: 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 vent 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 engaged 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) ) rotates so that the second through hole and the first through hole are staggered, 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 provided 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 provided 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).

6. The flue gas waste heat evaporator according to claim 5, wherein: The cavity of the hollow block (920) is provided with a second impeller (925) whose shaft end corresponds to the movable column (918), and the shaft of the second impeller (925) is provided with a docking groove, and one end of the movable column (918) is provided with a docking block (919). The cavity is connected to the air injection pipe (927) and the air outlet pipe (928), one end of the air injection pipe (927) is connected to the heat preservation shell (932), and 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), and the electric three-way valve (935) is connected to the insulation shell (932) and the first smoke exhaust pipe (8). Solenoid valves are provided in the gas injection pipe (927) and the exhaust pipe (926). The insulation shell (932) is connected to a corresponding piston (933) through an elastic member.

7. The flue gas waste heat evaporator according to claim 5, wherein: A plurality of groups of pushing blocks (922) are slidably sleeved on the outer wall of the movable column (918). The pushing blocks (922) are also rotatably arranged on brackets fixed to the inner wall of the hollow column (913). A sliding groove adapted to its outer contour is formed in the outer wall of the pushing block (922). An active connecting rod (923) is movably embedded on both sides of the sliding groove. The opposite ends of the two active connecting rods (923) extend into the two assembly rods (914) respectively and are connected to a perforated pressure plate (924). When the movable column (918) rotates, the pushing block (922) drives the active connecting rod (923) to drive the perforated pressure plate (924) to squeeze the high-temperature resistant flexible water-absorbing member (915) in the assembly rod (914).

8. The flue gas waste heat evaporator according to claim 6, characterized in that: The hollow column (913) includes an elastic telescopic rod. The bottom of the movable section of the elastic telescopic rod abuts against a first detection sensor (931) arranged on a connection seat (930). The connection seat (930) is movably inserted into the bottom of the air inlet pipe (95) and is connected to the steam-water separation box (92). A second detection sensor for detecting the piston (933) is arranged below the inner wall of the heat preservation shell (932). Both the first detection sensor (931) and the second detection sensor are electrically connected to a controller. When the first detection sensor (931) 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 (935) and the solenoid valves and electromagnetic blocks (921) in the injection pipe (927) are controlled by the controller respectively. When the second detection sensor detects the piston (933), the electric three-way valve (935) is controlled by the controller.

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