A full premix water-cooled mixed flow gas steam generator

Abstract

This utility model discloses a fully premixed water-cooled mixed-flow gas-fired steam generator, comprising: an inlet chamber, a combustion chamber, a superheater, an evaporation chamber, and an economizer. The inlet end of the combustion chamber is connected to the outlet end of the inlet chamber. A water jacket is provided around the outer perimeter of the inner wall of the combustion chamber. Several first heat exchange tubes are provided in the combustion chamber. The inlet end of the superheater is connected to the outlet end of the combustion chamber. Heating coils are provided on the inner wall of the superheater. The inlet end of the evaporation chamber is connected to the outlet end of the superheater. An upper collection chamber and a lower collection chamber are respectively provided at the top and bottom of the evaporation chamber. Several second heat exchange tubes are provided in the evaporation chamber. The inlet end of the economizer is connected to the outlet end of the evaporation chamber. A water inlet tank and a water outlet tank are respectively provided on both sides of the economizer. Several third heat exchange tubes are provided inside the economizer. This utility model has high heat exchange efficiency, good steam quality, and fast response speed, and can efficiently and stably produce high-quality steam to meet the needs of various industrial production, while reducing energy consumption and production costs.

Description

Technical Field

[0001] This utility model relates to the field of steam generator technology, and in particular to a fully premixed water-cooled mixed-flow gas steam generator. Background Technology

[0002] Traditional steam generators typically employ either flow-through or simple coil heating methods. Their heat transfer mechanisms are relatively simple, and the heat exchange between the water inside the tubes and the external heating source is insufficient. This results in a significant amount of heat being lost without being effectively utilized, leading to low overall heat exchange efficiency and consuming a large amount of energy without producing enough steam. Flow-through steam generators, due to new regulations requiring a full volume of less than 30L and limiting the size of the upper and lower headers, produce steam with higher humidity, making it difficult to meet the demands of industrial production with high steam dryness requirements. When the steam demand changes suddenly during production, some existing steam generators cannot adjust quickly, and the increase or decrease in steam output takes a considerable amount of time. For production lines with high requirements for timely steam supply, this can severely impact production efficiency and product quality stability. Utility Model Content

[0003] The purpose of this invention is to provide a fully premixed water-cooled mixed-flow gas-fired steam generator with high heat exchange efficiency, good steam quality, and fast response speed. It can efficiently and stably produce high-quality steam to meet the needs of various industrial production while reducing energy consumption and production costs.

[0004] To achieve the above and other related objectives, this utility model provides a fully premixed water-cooled mixed-flow gas-steam generator, comprising: an air inlet chamber, a combustion chamber, a superheater, an evaporator, and an energy saver. The air inlet of the air inlet chamber is connected to the outlet of a blower, and the inlet of the blower is connected to a gas supply pipeline. The inlet end of the combustion chamber is connected to the outlet end of the air inlet chamber. A water jacket is provided around the outer perimeter of the inner wall of the combustion chamber. The top of the water jacket is connected to one end of a first water outlet pipe, and the bottom of the water jacket is connected to one end of a first water inlet pipe. The other end of the first water outlet pipe is connected to a water tank. A plurality of first heat exchange tubes are provided in the combustion chamber, with both ends of each tube connected to the water jacket. The inlet end of the superheater is connected to the outlet end of the combustion chamber. A heating coil is provided on the inner wall of the superheater. The top of the superheater has a first air inlet and a first air outlet, which are respectively connected to both ends of the heating coil. The inlet end of the evaporator is connected to the superheater. The evaporation chamber is connected to the outlet end of the first inlet pipe. The top and bottom of the evaporation chamber are respectively provided with an upper collection chamber and a lower collection chamber. The evaporation chamber contains several second heat exchange tubes, with both ends connected to the upper and lower collection chambers respectively. The top of the upper collection chamber has a second air outlet, which is connected to the first air inlet via a pipe. The bottom of the lower collection chamber is connected to the outlet of a water supply pump via a pipe. The inlet of the water supply pump is connected to the water tank via a pipe. The evaporation chamber is equipped with a level gauge. The inlet end of the energy-saving device is connected to the outlet end of the evaporation chamber. The outlet end of the energy-saving device has an exhaust port. The energy-saving device has an inlet tank and an outlet tank on both sides respectively. The energy-saving device contains several third heat exchange tubes, with both ends connected to the inlet tank and the outlet tank respectively. The inlet tank is connected to the outlet of a circulating water pump via a pipe. The inlet of the circulating water pump is connected to the water tank via a pipe. The outlet tank is connected to the other end of the first inlet pipe.

[0005] In one example of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model, the two ends of a plurality of first heat exchange tubes are respectively fixedly connected to the top and bottom of the inner wall of the combustion chamber, and the two ends of a plurality of first heat exchange tubes are respectively connected to the water jacket located at the top and bottom of the combustion chamber.

[0006] In one example of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model, a top plate and a bottom plate are fixedly installed at the top and bottom of the evaporation chamber, respectively. The upper collection chamber and the lower collection chamber are fixedly connected to the top plate and the bottom plate, respectively. The outer walls of both ends of a plurality of second heat exchange tubes are fixedly connected to the top plate and the bottom plate, respectively. A plurality of heat exchange fins are provided on the outer wall of each second heat exchange tube.

[0007] In one example of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model, the top of the upper chamber and the bottom of the lower chamber are connected by a connecting pipe, the level gauge is provided on the connecting pipe, and a drain valve is installed at the bottom of the connecting pipe.

[0008] In one example of the fully premixed water-cooled mixed-flow gas steam generator of this utility model, the level gauge is a flap level gauge.

[0009] In one example of the fully premixed water-cooled mixed-flow gas steam generator of this utility model, a first check valve is installed at the outlet of the water supply pump. The first check valve is connected to the bottom of the lower collection chamber through a second water inlet pipe. A solenoid valve is provided on the second water inlet pipe. The water supply pump, the level gauge, and the solenoid valve are electrically connected to the controller.

[0010] In one example of the fully premixed water-cooled mixed-flow gas steam generator of this utility model, the outlet of the circulating water pump is connected to the water inlet tank through a third water inlet pipe. A flow rate sensor is provided on the third water inlet pipe, and the circulating water pump and the flow rate sensor are electrically connected to the controller respectively.

[0011] In one example of the fully premixed water-cooled mixed-flow gas steam generator of this utility model, each of the third heat exchange tubes is provided with several heat exchange fins, and a flue gas temperature sensor is provided at the exhaust port. The flue gas temperature sensor is electrically connected to the controller.

[0012] In one example of the fully premixed water-cooled mixed-flow gas steam generator of this utility model, a second check valve is installed at the first gas outlet, the second check valve is connected to the steam valve, and a steam pressure sensor and a steam temperature sensor are provided at the first gas outlet, the steam pressure sensor and the steam temperature sensor are respectively electrically connected to the controller.

[0013] In one example of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model, the air inlet of the air inlet chamber is located at the top of the air inlet chamber on the side away from the combustion chamber, and the main body of the combustion chamber, the superheater and the evaporation chamber is a cuboid.

[0014] This utility model of a fully premixed water-cooled mixed-flow gas-fired steam generator utilizes a fan to transport fully premixed gas from the gas supply pipeline to the inlet chamber, where it is burned in the combustion chamber. The flue gas generated by combustion passes sequentially through a superheater, an evaporator, and an economizer before being discharged from the exhaust port. A water pump supplies water to the lower collection chamber, and the water flows from the lower collection chamber into several second heat exchange tubes for heat exchange. The resulting unsaturated steam enters the heating coils in the superheater through the upper collection chamber, the second outlet, and the first inlet. The unsaturated steam is reheated in the heating coils to form saturated steam or superheated steam, thereby increasing the contact area and time between the water and the heating source, improving heat exchange efficiency, and giving the steam a higher dryness. Several third heat exchange tubes in the economizer can recover the heat energy from the flue gas discharged from the evaporator, and several first heat exchange tubes in the combustion chamber can preheat the water in the water tank, thereby improving the steam production efficiency of the equipment. This invention features high heat exchange efficiency, good steam quality, and fast response speed, enabling efficient and stable production of high-quality steam to meet the needs of various industrial production while reducing energy consumption and production costs. Attached Figure Description

[0015] Figure 1 This is a perspective view of an embodiment of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model;

[0018] Figure 4 This is a left view of an embodiment of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model;

[0019] Figure 5 This is a right view of an embodiment of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model.

[0020] Component designation:

[0021] 100 Inlet chamber; 110 Fan; 200 Combustion chamber; 210 Water jacket; 220 First water outlet pipe; 230 First water inlet pipe; 240 First heat exchanger tube; 300 Superheater; 310 Heating coil; 320 First air inlet; 331 First air outlet; 332 Second check valve; 332 Steam valve; 400 Evaporation chamber; 410 Upper collection chamber; 420 Lower collection chamber; 430 Second heat exchanger tube; 4 31 Top plate; 432 Bottom plate; 440 Second air outlet; 450 Liquid level gauge; 460 Connecting pipe; 461 Drain valve; 500 Energy saver; 510 Exhaust port; 520 Water inlet tank; 530 Water outlet tank; 540 Third heat exchanger tube; 600 Water tank; 700 Water supply pump; 710 First check valve; 720 Second water inlet pipe; 730 Solenoid valve; 800 Circulating water pump; 810 Third water inlet pipe. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0023] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0024] Please see Figures 1 to 5This utility model provides a fully premixed water-cooled mixed-flow gas-steam generator, comprising: an air inlet chamber 100, a combustion chamber 200, a superheater 300, an evaporation chamber 400, and an energy saver 500. The air inlet of the air inlet chamber 100 is connected to the outlet of a blower 110, and the inlet of the blower 110 is connected to a gas supply pipeline. The inlet end of the combustion chamber 200 is connected to the outlet end of the air inlet chamber 100. A water jacket 210 is provided around the inner wall of the combustion chamber 200. The top of the water jacket 210 is connected to one end of a first water outlet pipe 220, and the bottom of the water jacket 210 is connected to one end of a first water inlet pipe 230. The other end of the first water outlet pipe 220 is connected to a water tank 600. A plurality of first heat exchange tubes 240 are provided inside the combustion chamber 200, and both ends of the plurality of first heat exchange tubes 240 are respectively connected to the water jacket 210. The inlet end of the superheater 300 is connected to the outlet end of the combustion chamber 200. A heating coil 310 is provided on the inner wall of the superheater 300. A first air inlet 320 and a first air outlet 330 are provided on the top of the superheater 300. The first air inlet 320 and the first air outlet 330 are respectively connected to the two ends of the heating coil 310. The inlet end of the evaporation chamber 400 is connected to the outlet end of the superheater 300. The top and bottom of the evaporation chamber 400 are respectively provided with an upper collection chamber 410 and a lower collection chamber 420. The evaporation chamber 400 is provided with a plurality of second heat exchange tubes 430. The two ends of the plurality of second heat exchange tubes 430 are respectively connected to the upper collection chamber 410 and the lower collection chamber 420. The top of the upper collection chamber 410 is provided with a second air outlet 440. The second air outlet 440 is connected to the first air inlet 320 through a pipe. The bottom of the lower collection chamber 420 is connected to the outlet of the water supply pump 700 through a pipe. The inlet of the water supply pump 700 is connected to the water tank 600 through a pipe. The evaporation chamber 400 is provided with a level gauge 450. The inlet end of the energy-saving device 500 is connected to the outlet end of the evaporation chamber 400. The outlet end of the energy-saving device 500 is provided with an exhaust port 510. The two sides of the energy-saving device 500 are respectively provided with an inlet tank 520 and an outlet tank 530. The energy-saving device 500 is provided with a plurality of third heat exchange tubes 540. The two ends of the plurality of third heat exchange tubes 540 are respectively connected to the inlet tank 520 and the outlet tank 530. The inlet tank 520 is connected to the outlet of the circulating water pump 800 through a pipe. The inlet of the circulating water pump 800 is connected to the water tank 600 through a pipe. The outlet tank 530 is connected to the other end of the first inlet pipe 230.

[0025] This invention utilizes a fan 110 to transport fully premixed fuel gas from the gas supply pipeline to the intake chamber 100. The fuel gas is burned in the combustion chamber 200, and the resulting flue gas passes sequentially through the superheater 300, the evaporator 400, and the energy-saving device 500 before being discharged from the exhaust port 510. A water pump 700 transports water from the water tank 600 to the lower collection chamber 420. The water then enters several second heat exchange tubes 430 for heat exchange, forming unsaturated steam. This unsaturated steam passes through the upper collection chamber 410, the second exhaust port 440, and the first intake port 320 into the heating coil 310 within the superheater 300. The unsaturated steam is reheated in the heating coil 310 to form saturated steam or superheated steam. The superheater 300 and the evaporator 400 effectively increase the contact area and time between the water or steam and the heating source, improving heat exchange efficiency and resulting in steam with a higher dryness. Water in water tank 600 enters economizer 500 from inlet tank 520 via circulating water pump 800. After heat exchange through several third heat exchange tubes 540, it is discharged from outlet tank 530. The discharged water enters water jacket 210 through first inlet pipe 230, and after heat exchange through several first heat exchange tubes 240, it is discharged from the top of water jacket 210 into first outlet pipe 220, and finally returns to water tank 600. The heat energy in the flue gas discharged from evaporation chamber 400 can be recovered by the several third heat exchange tubes 540 in economizer 500. The water in water tank 600 can be preheated by the several first heat exchange tubes 240 and water jacket 210 in combustion chamber 200, thereby improving the steam production efficiency of the equipment.

[0026] Please see Figure 3 In one example of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model, the two ends of a plurality of first heat exchange tubes 240 are respectively fixedly connected to the top and bottom of the inner wall of the combustion chamber 200, and the two ends of a plurality of first heat exchange tubes 240 are respectively connected to the water jacket 210 located at the top and bottom of the combustion chamber 200.

[0027] Please see Figure 3 and Figure 4In one example of the fully premixed water-cooled mixed-flow gas-fired steam generator of this utility model, a top plate 431 and a bottom plate 432 are fixedly installed at the top and bottom of the evaporation chamber 400, respectively. The upper collection chamber 410 and the lower collection chamber 420 are fixedly connected to the top plate 431 and the bottom plate 432, respectively. The outer walls of both ends of a plurality of second heat exchange tubes 430 are fixedly connected to the top plate 431 and the bottom plate 432, respectively. Each second heat exchange tube 430 has a plurality of heat exchange fins on its outer wall. The top of the upper collection chamber 410 and the bottom of the lower collection chamber 420 are connected by a connecting pipe 460. A level gauge 450 is installed on the connecting pipe 460, and a drain valve 461 is installed at the bottom of the connecting pipe 460. The level gauge 450 is a flap level gauge. The drain valve 461 facilitates drainage during cleaning.

[0028] Please see Figures 1 to 5 In one example of the fully premixed water-cooled mixed-flow gas-fired steam generator of this utility model, a first check valve 710 is installed at the outlet of the water supply pump 700. The first check valve 710 is connected to the bottom of the lower collection chamber 420 through a second water inlet pipe 720. A solenoid valve 730 is provided on the second water inlet pipe 720. The water supply pump 700, the level gauge 450, and the solenoid valve 730 are electrically connected to the controller. The outlet of the circulating water pump 800 is connected to the water inlet tank 520 through a third water inlet pipe 810. A flow rate sensor is provided on the third water inlet pipe 810. The circulating water pump 800 and the flow rate sensor are electrically connected to the controller. Each of the third heat exchange tubes 540 is provided with several heat exchange fins. A flue gas temperature sensor is provided at the exhaust port 510. The flue gas temperature sensor is electrically connected to the controller. A second check valve 331 is installed at the first air outlet 330. The second check valve 331 is connected to the steam valve 332. A steam pressure sensor and a steam temperature sensor are provided at the first air outlet 330. The steam pressure sensor and the steam temperature sensor are electrically connected to the controller respectively.

[0029] The liquid level gauge 450 monitors the liquid level in the evaporation chamber 400. When the liquid level is lower than the set value, the controller controls the water supply pump 700 to increase the water supply speed, replenishing water into the evaporation chamber 400. When the liquid level is higher than the set value, the controller controls the water supply pump 700 to decrease the water supply speed, lowering the water level in the evaporation chamber 400. When steam demand increases, the controller controls the water supply pump 700 to increase the water supply speed, allowing more water to enter the evaporation chamber 400, thereby rapidly increasing steam production. When steam demand decreases, the controller controls the water supply pump 700 to decrease the water supply speed, thereby reducing steam production in the evaporation chamber 400. The flow rate sensor monitors the water flow rate in the third inlet pipe 810, and the controller can adjust the water supply speed of the circulating water pump 800. The flue gas temperature sensor monitors the temperature of the flue gas at the exhaust port 510, preventing excessively high flue gas temperatures from damaging the equipment. The steam pressure sensor and steam temperature sensor are used to monitor the steam pressure and temperature at the first outlet 330, respectively. When the steam pressure exceeds the set safety value, the controller will shut down the furnace. When the steam temperature exceeds the set safety value, the controller will shut down the furnace.

[0030] In one example of the fully premixed water-cooled mixed-flow gas-steam generator of this utility model, the air inlet of the air inlet chamber 100 is located at the top of the side of the air inlet chamber 100 away from the combustion chamber 200. The main body of the combustion chamber 200, the superheater 300 and the evaporation chamber 400 is a cuboid, which can make the combustion surface larger and more uniform, and avoid local high temperature.

[0031] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A fully premixed water-cooled mixed-flow gas-fired steam generator, characterized in that, include: An air intake chamber, wherein the air inlet of the air intake chamber is connected to the outlet of the fan, and the inlet of the fan is connected to the air supply pipeline; The combustion chamber has its inlet end connected to the outlet end of the air intake chamber. A water jacket is provided on the outer periphery of the inner wall of the combustion chamber. The top of the water jacket is connected to one end of the first water outlet pipe, and the bottom of the water jacket is connected to one end of the first water inlet pipe. The other end of the first water outlet pipe is connected to a water tank. The combustion chamber is provided with a plurality of first heat exchange tubes, and the two ends of the plurality of first heat exchange tubes are respectively connected to the water jacket. A superheater, wherein the inlet end of the superheater is connected to the outlet end of the combustion chamber, a heating coil is provided on the inner wall of the superheater, and a first air inlet and a first air outlet are provided on the top of the superheater, and the first air inlet and the first air outlet are respectively connected to the two ends of the heating coil. An evaporation chamber is provided, with its inlet end connected to the outlet end of the superheater. An upper collection chamber and a lower collection chamber are respectively located at the top and bottom of the evaporation chamber. A plurality of second heat exchange tubes are provided inside the evaporation chamber, with both ends connected to the upper and lower collection chambers respectively. A second air outlet is located at the top of the upper collection chamber and is connected to the first air inlet via a pipe. The bottom of the lower collection chamber is connected to the outlet of a water supply pump via a pipe. The inlet of the water supply pump is connected to a water tank via a pipe. A level gauge is provided on the evaporation chamber. An energy-saving device is provided, with its inlet end connected to the outlet end of the evaporation chamber. The outlet end of the energy-saving device is provided with an exhaust port. The energy-saving device has an inlet tank and an outlet tank on both sides. The energy-saving device contains a plurality of third heat exchange tubes, with both ends of the plurality of third heat exchange tubes connected to the inlet tank and the outlet tank respectively. The inlet tank is connected to the outlet of the circulating water pump through a pipe, and the inlet of the circulating water pump is connected to the water tank through a pipe. The outlet tank is connected to the other end of the first inlet pipe.

2. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 1, characterized in that, The two ends of a plurality of first heat exchange tubes are respectively fixedly connected to the top and bottom of the inner wall of the combustion chamber, and the two ends of a plurality of first heat exchange tubes are respectively connected to the water jacket located at the top and bottom of the combustion chamber.

3. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 1, characterized in that, The top and bottom of the evaporation chamber are fixedly installed with a top plate and a bottom plate, respectively. The upper collection chamber and the lower collection chamber are fixedly connected to the top plate and the bottom plate, respectively. The outer walls of both ends of a plurality of second heat exchange tubes are fixedly connected to the top plate and the bottom plate, respectively. A plurality of heat exchange fins are provided on the outer wall of each second heat exchange tube.

4. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 3, characterized in that, The top of the upper collection chamber and the bottom of the lower collection chamber are connected by a connecting pipe, on which the level gauge is installed, and at the bottom of the connecting pipe is a drain valve.

5. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 4, characterized in that, The level gauge is a flap level gauge.

6. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 1, characterized in that, The outlet of the water supply pump is equipped with a first check valve, which is connected to the bottom of the lower collection chamber through a second inlet pipe. A solenoid valve is provided on the second inlet pipe. The water supply pump, the level gauge, and the solenoid valve are electrically connected to the controller.

7. The fully premixed water-cooled mixed-flow gas-fired steam generator as described in claim 1, characterized in that, The outlet of the circulating water pump is connected to the inlet tank through a third inlet pipe. A flow rate sensor is installed on the third inlet pipe. The circulating water pump and the flow rate sensor are electrically connected to the controller.

8. The fully premixed water-cooled mixed-flow gas-fired steam generator as described in claim 1, characterized in that, Each of the third heat exchange tubes is provided with several heat exchange fins, and a flue gas temperature sensor is provided at the exhaust port. The flue gas temperature sensor is electrically connected to the controller.

9. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 1, characterized in that, A second check valve is installed at the first air outlet, and the second check valve is connected to the steam valve. A steam pressure sensor and a steam temperature sensor are provided at the first air outlet, and the steam pressure sensor and the steam temperature sensor are electrically connected to the controller respectively.

10. The fully premixed water-cooled mixed-flow gas-steam generator as described in claim 1, characterized in that, The air inlet of the air intake chamber is located at the top of the air intake chamber on the side away from the combustion chamber, and the main body of the combustion chamber, the superheater and the evaporator chamber is a cuboid.

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