Water pipe and fire pipe mixed steam generator

Abstract

The utility model relates to the field of steam generators, in particular to a water pipe and fire pipe mixed steam generator which comprises a fire clay smoke chamber, and a burner is arranged on the fire clay smoke chamber. The mixed heat exchanger is composed of a plurality of sleeve type heat exchange units located in the combustion chamber, each sleeve type heat exchange unit comprises a fire pipe and a water pipe arranged outside the fire pipe in a sleeving mode, the fire pipes are communicated with the combustion chamber, a chimney opening is formed in the top of the combustion chamber, smoke penetrates through the fire pipes and then is exhausted from the chimney opening, and steam pockets are arranged at the tops and the bottoms of the water pipes. A steam outlet is formed in the top of each steam pocket. According to the utility model, the fire tube is sleeved in the water tube, so that the advantages of a fire tube type steam generator and a water tube type steam generator are ingeniously combined, the heat efficiency is greatly improved, the energy consumption is reduced, the problems of ash deposition and scaling are effectively reduced, the operation stability of equipment is improved, the service life of the equipment is prolonged, and the flexibility of steam requirements of different scales is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam generator technical field especially relates to a steam generator of water pipe and fire tube mixing. BACKGROUND

[0002] At present, the common steam generator on the market mainly has two types of fire tube type and water tube type. The fire tube type steam generator makes the high-temperature flue gas generated by combustion flow in the fire tube, transfers heat to the water outside the pipe, and makes it produce steam. Although this structure is simple, the thermal efficiency is relatively low, and the fire tube is easy to accumulate dust, which affects the heat transfer effect, increases the equipment operation cost, and needs frequent maintenance. The water tube type steam generator is that water flows in the pipe, flue gas flows outside the pipe, and heat is transferred to water through the pipe wall. Its advantage is high thermal efficiency, but the structure is relatively complex, the water quality requirement is high, and scaling problem is easy to occur. Once scaling occurs, the heat transfer efficiency will be reduced, and even the pipeline will be blocked, which needs frequent shutdown for cleaning, and seriously affects the production efficiency.

[0003] The fire tube type steam generator has low thermal efficiency, limited steam production under high energy consumption, and increased production cost. Moreover, it is difficult to clean the accumulated dust in the fire tube, which affects the normal operation and service life of the equipment. Although the water tube type steam generator has high thermal efficiency, it has high requirements for water quality. Once the water quality is not up to standard, scaling will cause the heat transfer efficiency to decrease, and even the pipeline will be blocked, which needs frequent shutdown for cleaning, and affects the production efficiency. At the same time, the two types of steam generators have insufficient flexibility when facing different scales of steam demand, and are difficult to meet the requirements of diversified production scenes. INVENTION CONTENTS

[0004] The utility model aims at the problems of low thermal efficiency of fire tube type steam generator, difficult cleaning of accumulated dust in fire tube, high water quality requirement of water tube type steam generator, and insufficient flexibility of the two types of steam generators, and provides a steam generator of water pipe and fire tube mixing.

[0005] The technical scheme of the utility model: a steam generator of water pipe and fire tube mixing, including fire clay smoke chamber, the fire clay smoke chamber is combustion chamber, and the fire clay smoke chamber is provided with combustor on; it also includes mixed heat exchanger, and the mixed heat exchanger is composed of multiple sleeve type heat exchange units in the combustion chamber, each sleeve type heat exchange unit includes a fire tube and a water pipe sleeved outside the fire tube, the water pipe is supplied with water by water supply equipment, the fire tube is communicated with the combustion chamber, a chimney is arranged at the top of the combustion chamber, flue gas passes through the fire tube and is discharged from the chimney, and steam outlets are arranged at the top and bottom of the water pipe.

[0006] Preferably, the combustion chamber is provided with a combustor opening for docking with the combustor, and the combustor opening is located at the top or bottom of the combustion chamber.

[0007] Preferably, both the water pipe and the fire pipe are installed vertically, with an external pipe installed on the top steam drum of one of them. A safety valve, a pressure gauge, and a pressure controller are installed on the external pipe.

[0008] Preferably, a spiral finned water pipe is installed at the top of the combustion chamber in the flue gas flow path, and the water supply equipment is connected to the spiral finned water pipe through the water inlet pipe. The spiral finned water pipe is connected to the steam drum at the bottom of the water pipe.

[0009] Preferably, the water supply equipment includes a water tank and a water pump installed on the inlet pipe, and a check valve is installed on the inlet pipe.

[0010] Preferably, a drain valve is installed at the bottom of the steam drum, and a corrugated plate demister is installed inside the steam drum at the top of the water pipe.

[0011] Preferably, a tee is provided at the top of the outer pipe, and the other two outlets of the tee are respectively connected to spiral pipes, and the tops of the two spiral pipes are respectively connected to a pressure gauge and a pressure controller.

[0012] Preferably, spiral fins are provided on the outer wall of the fire tube.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] 1. High efficiency and energy saving: The coaxial fire-tube and water-tube hybrid structure allows the burner flame to return to the smoke chamber outside the fire tubes and water tubes after combustion in the combustion chamber, through the bottom refractory mud smoke chamber. This allows the heat in the flue gas to be transferred to the water more directly and fully. The flue gas outlet adopts a direct-flow spiral finned water tube, and the water flow direction forms convection with the flue gas direction. The thermal efficiency is 30%-40% higher than that of traditional fire-tube steam generators and 15%-25% higher than that of water-tube steam generators. This significantly reduces energy consumption and saves enterprises a lot of production costs, resulting in significant economic and environmental benefits. At the same time, the heat from the smoke chamber and fire tubes completely surrounds the upper steam drum from the inside out, further improving the steam quality.

[0015] 2. Reduced Ash and Scale Accumulation: The flue gas outlet uses a direct-flow spiral finned water tube, allowing the flue gas to flow spirally on the tube, reducing the residence time of the flue gas on the tube wall and lowering the possibility of ash accumulation. Simultaneously, the spiral fin design increases the turbulence of the flue gas, helping to disperse accumulated ash and further reducing ash accumulation. The smooth inner wall of the water tube ensures smooth water flow, slowing down the scaling rate. Moreover, the design of the mixing heat exchanger makes the flow of flue gas and water more uniform, avoiding localized overheating or undercooling, further reducing ash and scale accumulation, and lowering equipment maintenance costs and downtime.

[0016] 3. Stable and Reliable Operation: The high-efficiency burner and refractory coating of the combustion chamber ensure combustion stability and extend the service life of the combustion chamber. The corrugated plate demister in the steam drum effectively guarantees steam quality and prevents water carryover from damaging steam-using equipment. The variable frequency speed control technology of the feedwater pump allows the equipment to flexibly adjust its operating status according to steam demand, improving the operational stability and reliability of the equipment, ensuring long-term stable operation, and providing a continuous and stable steam supply for enterprise production.

[0017] 4. High adaptability: Steam pressure and temperature can be adjusted via pressure control to meet different steam demands. Simultaneously, the water supply flow rate of the feedwater pump and the combustion intensity of the burner can be adjusted to flexibly adjust steam output, meeting the diverse production needs of everything from small factories to large enterprises. Whether in continuous or intermittent production, it can stably output the required steam, improving the equipment's versatility and practicality.

[0018] 5. High safety: Equipped with a water level gauge, the water level is detected and transmitted as a signal. Water is automatically added when there is no water to prevent the steam generator from burning dry due to lack of water. A safety valve is installed on the top to automatically release pressure in case of overpressure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention.

[0020] Attached reference numerals: 1. Refractory mud smoke chamber; 2. Burner; 3. Combustion chamber; 4. Water pipe; 5. Fire pipe; 6. Steam switch; 7. Safety valve; 8. Pressure gauge; 9. Pressure controller; 10. Spiral tube; 11. Drain valve; 12. Chimney opening; 13. Water tank; 14. Feed water pump; 15. Check valve; 16. Spiral finned water pipe; 17. Inlet pipe; 18. Steam drum. Detailed Implementation

[0021] Example 1, as Figure 1As shown, this utility model proposes a water-tube and fire-tube mixed steam generator, including a refractory mud smoke chamber 1, a combustion chamber 3 inside the refractory mud smoke chamber 1, and a burner 2 installed on the refractory mud smoke chamber 1. Combustion is formed in the combustion chamber 3. Specifically, the combustion chamber 3 is used for fuel combustion to generate high-temperature flue gas. The combustion uses a high-efficiency burner 2 to ensure complete fuel combustion and improve thermal energy utilization. The inner wall of the combustion chamber 3 is coated with a refractory material to enhance its high-temperature resistance and corrosion resistance, extend the service life of the combustion chamber 3, and ensure the safe and stable operation of the equipment. It also includes a mixing heat exchanger, which consists of multiple sleeves located in the combustion chamber 3. The heat exchange unit consists of a tubular heat exchanger unit, each including a fire tube 5 and a water tube 4 surrounding the fire tube 5. The fire tube 5 has spiral fins on its outer wall. The water tube 4 is supplied with water through a water supply system. The fire tube 5 is connected to a combustion chamber 3. A chimney opening 12 is located at the top of the combustion chamber 3. Flue gas passes through the fire tube 5 and exits from the chimney opening 12. Steam drums 18 are located at both the top and bottom of the water tube 4, and multiple steam drums 18 are interconnected. A steam outlet is located at the top of each steam drum 18, and a steam switch 6 is installed on the steam outlet, connecting to the steam-using equipment. In this embodiment, the water tube 4 is made of seamless steel with a smooth inner wall, allowing water to flow smoothly within the tube. The fire tube is a spiral finned tube with spiral fins on its outer wall, increasing the contact area between water / gas and the tube wall, improving heat transfer efficiency, and enhancing steam quality. The fire tube 5 and water tube 4 form a flue gas passage. High-temperature flue gas flows inside the fire tube 5 and on the outer wall of the water tube 4, transferring heat to the water inside the water tube 4 through the walls of the fire tube 5 and the water tube 4, thus heating the water to produce steam. This shell-and-tube structure design makes the heat exchange between the flue gas and water more complete and direct, effectively improving thermal efficiency.

[0022] Furthermore, the combustion chamber 3 is provided with a burner opening that connects to the burner 2, and the burner opening is located at the top or bottom of the combustion chamber 3.

[0023] Furthermore, both the water pipe 4 and the fire pipe 5 are vertically installed. An external pipe is installed on the top of the steam drum 18 of one of them. A safety valve 7, a pressure gauge 8, and a pressure controller 9 are installed on the external pipe. Specifically, a tee is installed at the top of the external pipe. The other two outlets of the tee are connected to the spiral pipes 10 respectively. The tops of the two spiral pipes 10 are connected to the pressure gauge 8 and the pressure controller 9 respectively. The pressure gauge 8 is used to monitor the steam pressure inside the steam drum 18, and the pressure controller 9 is used to regulate the steam pressure and temperature.

[0024] Furthermore, a drain valve 11 is installed at the bottom of the steam drum 18 to periodically discharge impurities and deposits inside the steam drum 18, keeping the inside of the steam drum 18 clean and ensuring stable steam quality; in this embodiment, a corrugated plate demister is installed inside the steam drum 18 at the top of the water pipe 4 to effectively remove moisture from the steam and ensure steam quality.

[0025] Example 2, as Figure 1As shown, this utility model proposes a steam generator that combines water pipes and fire pipes. Compared with Embodiment 1, this embodiment details the water supply structure.

[0026] A spiral finned water pipe 16 is installed at the top of the combustion chamber in the flue gas flow path. The water supply equipment is connected to the spiral finned water pipe 16 through the water inlet pipe 17. The spiral finned water pipe 16 is connected to the steam drum 18 at the bottom of the water pipe 4.

[0027] The water supply equipment includes a water tank 13 and a water pump 14 installed on the inlet pipe 17. A check valve 15 is installed on the inlet pipe 17. The water pump 14 adopts variable frequency speed control technology to automatically adjust the water supply flow according to the steam demand, achieving energy-saving operation. By precisely controlling the water supply flow, the steam output can be flexibly adjusted to meet the steam demand of different scales, improving the adaptability and flexibility of the equipment. In an optional embodiment, a water level detector is installed on the water pipe 4. The water level detector transmits a signal to detect the water level. Water is automatically added when there is no water, preventing the steam generator from dry burning due to lack of water.

[0028] In summary, when this utility model is in use, the water pump 14 delivers water to the water pipe 4 through the water inlet pipe 17 and the spiral finned water pipe 16. The high-temperature flue gas from combustion in the combustion chamber 3 heats the water in the water pipe 4 through the fire pipe 5 and the water pipe 4. After passing through the fire pipe 5, the flue gas is discharged from the chimney outlet 12. During the flue gas discharge process, the water can also be preheated through the spiral finned water pipe 16.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A steam generator combining water and fire tubes, comprising a refractory mud smoke chamber (1), wherein the refractory mud smoke chamber (1) contains a combustion chamber (3), and a burner (2) is mounted on the refractory mud smoke chamber (1); characterized in that, It also includes a mixing heat exchanger, which consists of multiple shell-and-tube heat exchange units located in the combustion chamber (3). Each shell-and-tube heat exchange unit includes a fire tube (5) and a water pipe (4) sleeved outside the fire tube (5). The water pipe (4) is supplied with water through a water supply device. The fire tube (5) is connected to the combustion chamber (3). A chimney opening (12) is provided at the top of the combustion chamber (3). The flue gas passes through the fire tube (5) and is discharged from the chimney opening (12). Steam drums (18) are provided at the top and bottom of the water pipe (4). Multiple steam drums (18) are interconnected. A steam outlet is provided at the top of the steam drum (18).

2. The steam generator with water-pipe and fire-pipe mixing according to claim 1, characterized in that, The combustion chamber (3) is provided with a burner opening that connects to the burner (2), and the burner opening is located at the top or bottom of the combustion chamber (3).

3. The steam generator with water-pipe and fire-pipe mixing according to claim 1, characterized in that, Both the water pipe (4) and the fire pipe (5) are installed vertically. An external pipe is installed on the steam drum (18) at the top of one of them. A safety valve (7), a pressure gauge (8) and a pressure controller (9) are installed on the external pipe.

4. The steam generator with water-pipe and fire-pipe mixing according to claim 1, characterized in that, A spiral finned water pipe (16) is installed on the top of the combustion chamber along the flue gas flow path. The water supply equipment is connected to the spiral finned water pipe (16) through the water inlet pipe (17). The spiral finned water pipe (16) is connected to the steam drum (18) at the bottom of the water pipe (4).

5. The steam generator with water-pipe and fire-pipe mixing according to claim 4, characterized in that, The water supply equipment includes a water tank (13) and a water pump (14) installed on the water inlet pipe (17), and a check valve (15) is installed on the water inlet pipe (17).

6. The steam generator with water-pipe and fire-pipe mixing according to claim 1, characterized in that, A drain valve (11) is installed at the bottom of the steam drum (18), and a corrugated plate demister is installed inside the steam drum (18) at the top of the water pipe (4).

7. The steam generator with water-pipe and fire-pipe mixing according to claim 1, characterized in that, A tee is installed at the top of the external pipe. The other two outlets of the tee are connected to the spiral pipe (10) respectively. The tops of the two spiral pipes (10) are connected to the pressure gauge (8) and the pressure controller (9) respectively.

8. The steam generator with water-pipe and fire-pipe mixing according to claim 1, characterized in that, Spiral fins are installed on the outer wall of the fire tube (5).

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