A pot stove with cleaning function for waste heat recovery device

Abstract

This invention relates to the field of waste heat recovery in gas stoves, and more particularly to a stove with a cleaning function for the waste heat recovery device, comprising a stove platform, a waste heat recovery device, a descaling device, a steam box, and a hot water tank; the stove platform has an internal combustion chamber, and the waste heat recovery device is installed on one side of the stove platform, comprising a warm water tank, a flue pipe, a heat exchange base, a steam box, and a heat exchanger; this invention utilizes the heat from the flue gas emitted by the gas stove to convert it into hot water, warm water, and steam, and can effectively clean the soot on the inner wall of the flue gas heat exchange tube; this invention utilizes the system's own steam, pressurizing the steam to use high-temperature, high-pressure steam to clean the soot on the inner wall of the flue gas heat exchange tube, achieving good results, high efficiency, and low cost, and improving the long-term heat exchange efficiency of the flue gas heat exchange tube.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas stove waste heat recovery, in particular to a pot stove with a cleaning function for a waste heat recovery device. BACKGROUND

[0002] With the increasing emphasis of the state on environmental protection, energy saving, carbon emission reduction and pollutant emission reduction have become the main goals of the development of various energy consumption industries. In recent years, with the gradual improvement of people's living standards, the catering industry has developed greatly. However, the catering industry consumes a large amount of energy every day and emits a large amount of waste heat flue gas and kitchen waste. Fuel consumption during food cooking, daily drinking hot water and hot water for washing in the kitchen are constantly consuming energy and emitting carbon dioxide.

[0003] In order to reduce carbon emissions and reduce energy loss, the existing commercial gas stove usually recovers and utilizes the heat in the high-temperature flue gas (about 500-600 DEG C) generated during the combustion process of the stove through heat exchange pipes, such as heating water to provide hot water or steam. However, the heat exchange pipe in the existing waste heat recovery device often appears to be scaled in the long-term use process. The first reason for scaling is that the high-temperature flue gas contains carbon particles and oil fume entering during the cooking process. During the heat exchange process between the high-temperature flue gas inside the heat exchange pipe and the water outside the heat exchange pipe, the carbon particles or oil stains in the flue gas will condense and scale on the inner wall of the heat exchange pipe after being cooled. The second reason is that the friction between the high-temperature flue gas flowing in the heat exchange pipe and the heat exchange pipe wall produces friction deposition. The scale on the inner wall of the heat exchange pipe will become thicker and thicker over time and will greatly reduce the heat exchange efficiency of the heat exchange pipe, so that the heat in the flue gas cannot be fully recovered and utilized. Therefore, a device is needed that can efficiently and regularly remove the scale on the inner wall of the heat exchange pipe. SUMMARY

[0004] Therefore, the present application is made in view of the above problems. The purpose of the present application is to provide a gas storage tank, so that the high-temperature water vapor generated by flue gas heat exchange enters the gas storage tank. When the high-temperature water vapor reaches a certain pressure in the gas storage tank, it is sprayed onto the inner wall of the heat exchange pipe. The high-temperature and high-pressure characteristics of the water vapor are used to remove the scale attached to the inner wall of the heat exchange pipe. The problem of the long-term attachment of scale on the inner wall of the heat exchange pipe affecting the heat exchange efficiency is solved. The present application achieves the above-mentioned purposes through the following technical solutions:

[0005] A stove with a cleaning function for waste heat recovery devices includes a stove platform, a waste heat recovery device, a descaling device, a steam box, and a hot water tank. The stove platform has an internal combustion chamber. The waste heat recovery device is installed on one side of the stove platform and includes a warm water tank, a flue pipe, a heat exchange base, a steam box, and a heat exchanger. The warm water tank is fixedly installed on the side wall of the stove platform. The flue pipe is fixedly installed inside the stove platform, with one end connected to the inside of the combustion chamber and the other end extending into the warm water tank. The heat exchange base is located on both sides of the end of the flue pipe extending into the warm water tank. The steam box is located at the upper end of the heat exchange base. A water inlet and a steam guide pipe are respectively provided on the middle and upper side walls of the steam box. A heat exchanger is installed inside the steam box. The heat exchanger has a flue pipe at its upper end; the descaling device includes a gas storage tank, a connecting pipe, and a control valve. The gas storage tank is fixedly installed at the end of the flue pipe located in the hot water tank. A limit ring is fixedly installed inside the gas storage tank near the connection of the flue pipe. The center of the limit ring has an air outlet, and a blocking rod is slidably connected to the outside of the air outlet by a spring. One end of the connecting pipe is connected to two air guide pipes, and the other end is connected to the gas storage tank. The control valve is located at the end where the connecting pipe is connected to the air guide pipe. The steam box is fixedly installed at one end of the waste heat recovery device. A gas distribution pipe is installed between the steam box and the waste heat recovery device. The hot water tank is fixedly installed below the steam box. The hot water tank has a steam heat exchange pipe inside, and one end of the steam heat exchange pipe is connected to the inside of the steam box.

[0006] Preferably, the warm water tank has a water inlet pipe on one side.

[0007] Preferably, the lower half of the heat exchange base is provided with a slag discharge chamber, and a slag plug is installed at the lower end of the slag discharge chamber.

[0008] Preferably, the heat exchanger is mainly composed of multiple flue gas heat exchange tubes arranged in a row, and the inner surface of each flue gas heat exchange tube has spherical protrusions.

[0009] Preferably, the inner end of the air-blocking rod matches the air outlet on the limiting ring.

[0010] Preferably, the gas distribution pipe is connected to the gas guide pipe through the control of a control valve, thereby guiding high-temperature water vapor into the steam chamber.

[0011] Beneficial effects of this invention:

[0012] 1. This invention utilizes the heat from the flue gas emitted by the gas furnace to convert it into three forms: hot water, warm water, and steam. It can also effectively clean the soot on the inner wall of the flue gas heat exchange tube through steam pulse cleaning.

[0013] 2. This invention utilizes the system's own steam, pressurizing it to use high-temperature, high-pressure steam to clean the soot on the inner wall of the flue gas heat exchange tube. This method is effective, efficient, and low-cost, improving the long-term heat exchange efficiency of the flue gas heat exchange tube.

[0014] 3. The present invention provides spherical protrusions on the inner surface of the flue gas heat exchange tube. The spherical protrusions can reduce the flow velocity of flue gas on the inner surface of the flue gas heat exchange tube, thereby reducing friction deposits caused by friction between the flue gas and the inner wall of the flue gas heat exchange tube. Furthermore, after the spherical protrusions are covered with soot, the soot is more easily cleaned off under the impact of high-pressure steam. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a stove with a waste heat recovery device and a cleaning function according to the present invention.

[0016] Figure 2 This is a partial structural diagram of a stove with a waste heat recovery device that has a cleaning function according to the present invention.

[0017] Figure 3 This is a partial structural exploded view of a stove with a waste heat recovery device that has a cleaning function according to the present invention.

[0018] Figure 4 This is a top view of a stove with a waste heat recovery device that has a cleaning function according to the present invention.

[0019] Figure 5 for Figure 4 Sectional view along line AA.

[0020] Figure 6 for Figure 4 Sectional view along the BB line.

[0021] Figure 7 This is a schematic diagram of the structure of a flue gas heat exchange tube in a stove with a waste heat recovery device that has a cleaning function according to the present invention.

[0022] Figure Descriptions: 100, Stove platform; 110, Stove chamber; 200, Waste heat recovery device; 210, Warm water tank; 211, Water inlet pipe; 220, Exhaust pipe; 230, Heat exchange base; 231, Slag discharge chamber; 232, Slag plug; 240, Steam box; 241, Water inlet; 242, Air guide pipe; 250, Heat exchanger; 251, Flue gas heat exchange pipe; 251a, Spherical protrusion; 252, Exhaust pipe; 300, Descaling device; 310, Gas storage tank; 311, Limiting ring; 311a, Gas outlet; 312, Air plugging rod; 313, Spring; 320, Connecting pipe; 330, Control valve; 400, Steamer; 410, Gas distribution pipe; 500, Hot water tank; 510, Steam heat exchange pipe. Detailed Implementation

[0023] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings.

[0024] like Figure 1 As shown, a stove with a cleaning function for a waste heat recovery device includes: a stove platform 100, a waste heat recovery device 200, a descaling device 300, a steam oven 400, and a hot water tank 500.

[0025] like Figures 1 to 6 As shown, the stove 100 has a stove chamber 110 inside, and a gas pipe and an air pipe (not shown in the figure) are connected to the bottom of the stove chamber 110. The waste heat recovery device 200 is installed on one side of the stove 100. The waste heat recovery device 200 includes a warm water tank 210, a flue pipe 220, a heat exchange base 230, a steam box 240, and a heat exchanger 250. The warm water tank 210 is fixedly installed on the side wall of the stove 100. A water inlet pipe 211 is provided on one side of the warm water tank 210. The water inlet pipe 211 can guide tap water into the warm water tank 210. The flue pipe 220 is fixedly installed inside the stove 100, and one end of the flue pipe 220 is connected to the inside of the stove chamber 110, and the other end extends into the inside of the warm water tank 210.

[0026] The heat exchange base 230 is a hollow cylindrical structure. Two bases are fixedly installed on either side of the end of the exhaust pipe 220 extending into the warm water tank 210, and are connected to the interior of the exhaust pipe 220. The lower half of the heat exchange base 230 has a slag discharge chamber 231, and a slag plug 232 is installed at the lower end of the slag discharge chamber 231. Two steam boxes 240 are fixedly installed on the upper end of each heat exchange base 230. A water inlet 241 is located on the middle side wall of the steam box 240, and a vent pipe 242 is located on the upper side wall of the steam box 240. The water inlet 241 allows water from the warm water tank 210 to enter the steam box 240, and the vent pipe 242 allows steam to exit from the steam box 240. Two heat exchangers 250 are fixedly installed in the two steam boxes 240. Each heat exchanger 250 is mainly composed of multiple flue gas heat exchange tubes 251 arranged in a specific pattern. Figure 7As shown, each flue gas heat exchange tube 251 has a spherical protrusion 251a on its inner surface. The spherical protrusion 251a can reduce the flow velocity of flue gas on the inner surface of the flue gas heat exchange tube 251 and reduce the friction deposits generated by the friction between the high temperature flue gas and the inner wall of the flue gas heat exchange tube 251 during the flow of the flue gas heat exchange tube 251. The upper end of the heat exchanger 250 is provided with a flue gas outlet pipe 252, which can be connected to each flue gas heat exchange tube 251 at the lower end. The flue gas passing through each flue gas heat exchange tube 251 will eventually be discharged from the flue gas outlet pipe 252.

[0027] The descaling device 300 includes an air storage tank 310, a connecting pipe 320, and a control valve 330. The air storage tank 310 is fixedly installed at the end of the exhaust pipe 220 located in the warm water tank 210. Figure 6 As shown, a limiting ring 311 is fixedly installed inside the gas storage tank 310 near the connection of the exhaust pipe 220. The limiting ring 311 has an outlet 311a at its center. An air-blocking rod 312 is slidably connected to the outside of the outlet 311a through a spring 313. Under the elastic force of the spring 313, the air-blocking rod 312 can seal the outlet 311a on the limiting ring 311. The connecting pipe 320 is a U-shaped pipe. One end of the connecting pipe 320 is connected to two air guide pipes 242, and the other end is connected to the gas storage tank 310. The control valve 330 is located at the end of the connecting pipe 320 that is connected to the air guide pipe 242. The control valve 330 can control the flow direction of the steam in the air guide pipe 242.

[0028] The steam oven 400 is fixedly installed at one end of the waste heat recovery device 200. A steam distribution pipe 410 is installed between the steam oven 400 and the waste heat recovery device 200. The steam distribution pipe 410 can be connected to the steam guide pipe 242 through the control valve 330, thereby guiding high-temperature water vapor into the steam oven 400. The hot water tank 500 is fixedly installed below the steam oven 400. The hot water tank 500 is equipped with a steam heat exchange pipe 510 inside. One end of the steam heat exchange pipe 510 is connected to the inside of the steam oven 400. After the high-temperature water vapor in the steam oven 400 heats the food, it can continue to flow into the hot water tank 500 through the steam heat exchange pipe 510, transferring the remaining heat to the water in the hot water tank 500.

[0029] Working principle of this invention:

[0030] Tap water enters the warm water tank 210 through the inlet pipe 211. When the water level in the warm water tank 210 is higher than the water inlet 241 on the steam tank 240, the water in the warm water tank 210 will enter the steam tank 240 through the water inlet 241. When the water level in the steam tank 240 reaches the designated position, the inlet pipe 211 is closed. The high-temperature flue gas generated by the combustion of natural gas in the stove 110 flows into the two heat exchange bases 230 through the exhaust pipe 220, then flows through each flue gas heat exchange tube 251 in the heat exchanger 250, and finally exits through the exhaust pipe 252. When the high-temperature flue gas flows through the flue gas heat exchange tubes 251, it will transfer heat to the water in the steam tank 240. At the same time, the heat of the water in the steam tank 240 will be transferred to the warm water tank 210, warming the water. The water in tank 210 is heated. Since the water in the warm water tank 210 does not directly exchange heat with the flue gas heat exchange tube 251, the water temperature in the warm water tank 210 will not be too high. Therefore, the warm water tank 210 can provide warm water to the outside. As the water in the steam tank 240 is continuously heated, water vapor is generated. The water vapor flows through the vent pipe 242 to the connecting pipe 320. The control valve 330 connects the vent pipe 242 to the distribution pipe 410. Then, the high-temperature water vapor in the vent pipe 242 flows into the steam chamber 400 through the distribution pipe 410. The steam chamber 400 can be used to heat food. After heating the food, the high-temperature water vapor in the steam chamber 400 can continue to flow into the hot water tank 500 through the steam heat exchange tube 510, transferring the remaining heat to the hot water tank. The water in the hot water tank 500 is heated to a very high temperature due to the high temperature of the steam, thus enabling the hot water tank 500 to supply hot water to the outside. When the water in the steam tank 240 turns into steam and is discharged, causing the water level in the steam tank 240 to drop, the water in the warm water tank 210 will flow into the steam tank 240 through the water inlet 241 to restore the water level. When it is necessary to clean the soot inside the flue gas heat exchange tube 251, the control valve 330 is turned to connect the air guide tube 242 with the connecting tube 320. High-temperature steam will flow from the air guide tube 242 into the connecting tube 320 and finally into the air storage tank 310. Due to the action of the spring 313 inside the air storage tank 310, one end of the air blocking rod 312 is tightly pressed against the end face that contacts the limit ring 311. When the outlet 311a is closed, a sealed space is formed inside the gas storage tank 310. As more and more water vapor accumulates inside the gas storage tank 310, the pressure increases. When the pressure of the water vapor on the blocking rod 312 exceeds the elastic force of the spring 313, the blocking rod 312 begins to move, the spring 313 is compressed, and the end of the blocking rod 312 that was in contact with the limiting ring 311 begins to move away from the limiting ring 311. The outlet 311a gradually opens until the blocking rod 312 moves to the outlet position of the flue pipe 220 and seals the outlet of the flue pipe 220. At this point, the blocking rod 312 stops moving. The high-temperature, high-pressure water vapor then enters through the outlet 311a into the multiple flue gas heat exchange tubes 251 inside the two heat exchangers 250 and flows at high speed within the flue gas heat exchange tubes 251.Under the impact of high-temperature, high-pressure steam, the soot on the inner wall of the flue gas heat exchange tube 251 begins to detach. As steam continues to be ejected, when the pressure in the storage tank 310 decreases, the plugging rod 312 will return to its original position under the elastic force of the spring 313, closing the outlet 311a again. The steam continues to accumulate pressure in the storage tank 310, awaiting the next flush. During the cleaning process of the inner wall of the flue gas heat exchange tube 251, the lighter soot particles that are flushed away are carried out from the flue gas outlet pipe 252 by the steam, while the heavier soot falls into the slag discharge chamber 231 below after the impact. Finally, the soot can be removed by opening the slag plug 232. After cleaning, the control valve 330 is reset.

Claims

1. A cooktop with a cleaning function for a waste heat recovery device, comprising: A stove (100), a waste heat recovery device (200), and a descaling device (300); the waste heat recovery device (200) is installed on one side of the stove (100); a descaling device (300) is installed on one side of the waste heat recovery device (200). The waste heat recovery device (200) is characterized in that: a hot water tank (210), a flue pipe (220), a heat exchange base (230), a steam tank (240), and a heat exchanger (250); one end of the flue pipe (220) extends into the interior of the hot water tank (210); the heat exchange base (230) is located on both sides of the end of the flue pipe (220) that extends into the hot water tank (210); the steam tank (240) is located at the upper end of the heat exchange base (230); a water inlet (241) and a gas guide pipe (242) are respectively provided on the side walls of the middle and upper parts of the steam tank (240); a heat exchanger (250) is provided inside the steam tank (240); and a flue pipe (252) is provided at the upper end of the heat exchanger (250). The descaling device (300) includes an air storage tank (310), a connecting pipe (320), and a control valve (330); the air storage tank (310) is fixedly installed at the end of the exhaust pipe (220) in the hot water tank (210); one end of the connecting pipe (320) is connected to two air guide pipes (242), and the other end is connected to the air storage tank (310); the control valve (330) is located at the end where the connecting pipe (320) is connected to the air guide pipe (242); The stove (100) is provided with a stove chamber (110) inside, and a smoke exhaust pipe (220) is fixedly installed inside the stove (100). One end of the smoke exhaust pipe (220) is connected to the inside of the stove chamber (110). Inside the gas storage tank (310), a limiting ring (311) is fixedly installed near the connection of the exhaust pipe (220). The limiting ring (311) has an air outlet (311a) at its center, and a blocking rod (312) is slidably connected to the outside of the air outlet (311a) by a spring (313). A steamer (400) is fixedly installed at one end of the waste heat recovery device (200), and a gas distribution pipe (410) is installed between the steamer (400) and the waste heat recovery device (200). The gas distribution pipe (410) is connected to the gas guide pipe (242) through the control of the control valve (330), thereby guiding high-temperature water vapor into the steam chamber (400).

2. A cooker stove with a cleaning function for waste heat recovery device according to claim 1, characterized in that: A hot water tank (500) is fixedly installed below the steam oven (400). The hot water tank (500) is equipped with a steam heat exchange pipe (510) inside, and one end of the steam heat exchange pipe (510) is connected to the inside of the steam oven (400).

3. A cooker stove with a cleaning function for waste heat recovery device according to claim 2, characterized in that: The warm water tank (210) is provided with a water inlet pipe (211) on one side.

4. A cooker stove with a cleaning function for waste heat recovery device according to claim 3, characterized in that: The lower half of the heat exchange base (230) is provided with a slag discharge chamber (231), and a slag plug (232) is installed at the lower end of the slag discharge chamber (231).

5. A cooker stove with a cleaning function for waste heat recovery device according to claim 4, characterized in that: The heat exchanger (250) is composed of a plurality of flue gas heat exchange tubes (251) arranged together, and each flue gas heat exchange tube (251) has a spherical protrusion (251a) on its inner surface.

6. A cooker stove with a cleaning function for waste heat recovery device according to claim 5, characterized in that: The inner end of the air-blocking rod (312) matches the air outlet (311a) on the limiting ring (311).

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