A fully premixed water-cooled steam generating device

Abstract

The utility model provides a kind of full premix water cooling type steam generating device, including shell and base, the shell inside hollow, the base is fixed in the bottom of shell, the shell inside is equipped with water cooling premix low nitrogen burner, high-temperature flue gas heat exchanger, steam-water separator, low-temperature flue gas heat exchanger, flue gas condenser, feed water storage tank, evaporator feed water pump and tube side water cooling tube bundle feed water pump;The water cooling premix low nitrogen burner, high-temperature flue gas heat exchanger, steam-water separator, low-temperature flue gas heat exchanger and flue gas condenser are installed in shell inside from left to right in turn, and are fixed by flange between two two;The evaporator feed water pump is set in the front of flue gas condenser, the tube side water cooling tube bundle feed water pump is set in the front of high-temperature flue gas heat exchanger, the feed water storage tank is set in the right side of evaporator feed water pump, and the device can be fully exchanged with each heat exchange component by reasonable structure layout and optimized heat exchange design, heat of flue gas, improve energy utilization efficiency, reduce energy consumption.

Description

Technical Field

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

[0002] I. Water volume issue in steam generator

[0003] According to Article 1.3(1) of the "Boiler Safety Technical Regulations" (TSG 11-2020), steam boilers with a normal water level volume of less than 30L are not considered special equipment. In the industry, such equipment is mostly referred to as steam generators. Currently, various steam generators adopt different structures, but they all have problems such as excessive volume and unstable steam production to varying degrees.

[0004] II. Issues with premixed combustion technology:

[0005] Currently, the more mature technologies for low-NOx burners include gun-type burner flue gas recirculation combustion technology, porous media surface combustion technology, and water-cooled premixed combustion technology. Among them, gun-type burner flue gas recirculation combustion technology is complex to install and has high requirements for furnace size; porous media surface combustion technology requires a large amount of maintenance and cleaning on a regular basis.

[0006] To address these issues, a fully premixed water-cooled steam generator is proposed. Utility Model Content

[0007] In order to overcome the shortcomings of existing technologies and solve the problems of excessive volume and unstable steam production in existing steam generators, this utility model provides a fully premixed water-cooled steam generator.

[0008] This utility model is achieved using the following technical solution:

[0009] A fully premixed water-cooled steam generator includes a shell and a base. The shell is hollow inside, and the base is fixed to the bottom of the shell. The shell contains a water-cooled premixed low-NOx burner, a high-temperature flue gas heat exchanger, a steam-water separator, a low-temperature flue gas heat exchanger, a flue gas condenser, a feedwater storage tank, an evaporator feedwater pump, and a tube-side water-cooled tube bundle feedwater pump.

[0010] The water-cooled premixed low-NOx burner, high-temperature flue gas heat exchanger, steam-water separator, low-temperature flue gas heat exchanger, and flue gas condenser are installed inside the shell from left to right, and are connected and fixed in pairs by flanges.

[0011] The evaporator feedwater pump is located on the front of the flue gas condenser, the tube-side water-cooled tube bundle feedwater pump is located on the front of the high-temperature flue gas heat exchanger, and the feedwater storage tank is located on the right side of the evaporator feedwater pump.

[0012] The water-cooled premixed low-NOx burner includes a fan, an air filter at the air inlet of the fan, a premixing chamber at the air outlet of the fan, a gas valve assembly on the front of the premixing chamber, a gas pipe at the top of the gas valve assembly, and a gas regulating butterfly valve between the gas valve assembly and the fan.

[0013] A mixed gas equalization chamber is provided on the right side of the premixing chamber. A mixed gas equalization plate is provided at the connection between the mixed gas equalization chamber and the premixing chamber. A combustion chamber is provided on the side of the mixed gas equalization chamber. An ignition and flame detection device is provided in the combustion chamber. A fire observation hole is provided on the front of the combustion chamber. A tube-side water-cooled combustion tube bundle is provided between the combustion chamber and the mixed gas equalization chamber.

[0014] The front of the gas equalization chamber is provided with a gas equalization chamber pressure measuring hole, and the front of the combustion chamber is provided with a combustion chamber pressure measuring hole;

[0015] The flue gas condenser has a flue gas outlet on its side, a condenser flue gas pressure measuring hole on its front, a flue gas temperature measuring hole on the upper side wall of the flue gas outlet, and a flue gas condensate drain pipe on the side wall of the flue gas condenser.

[0016] The steam-water separator is equipped with a water level gauge on the front, the water supply tank is equipped with a water supply tank vent at the top, the water supply tank is equipped with a water supply tank drain outlet at the bottom, and the water supply tank is equipped with a water supply tank temperature measuring hole in the middle.

[0017] The input end of the tube-side water-cooled tube bundle feed pump is provided with a water inlet, the output end of the tube-side water-cooled tube bundle feed pump is provided with a tube-side water-cooled tube bundle feed pump outlet pressure measuring hole, the top of the low-temperature flue gas heat exchanger is provided with a low-temperature flue gas heat exchanger exhaust port, and the steam-water separator is provided with a steam-water separator drain port.

[0018] An electrical control box is located on the left side of the housing, and the electrical control box contains control accessories for controlling the entire equipment.

[0019] The present invention has the following advantages over the prior art:

[0020] 1. The water-cooled premixed low-NOx burner used in this steam generator is designed in strict accordance with the "General Technical Requirements for Water-cooled Premixed Low-NOx Burners". It operates stably and has a low flame temperature in the furnace, which greatly suppresses the formation of thermal NOx in flue gas pollutants.

[0021] The water-cooled premixed low-NOx burner uses tube-side water cooling to preheat the feedwater before sending it to the steam generator, which greatly improves the overall thermal efficiency.

[0022] 2. This steam generator adopts modular assembly, with flue gas flow and steam-water flow arranged in opposite directions according to the temperature gradient. It has an excellent heat exchange structure, high operating thermal efficiency, and saves fuel consumption.

[0023] 3. This steam generator uses a variable frequency control for the feed water pump. By controlling the water level, it can produce steam of different qualities according to actual needs without changing any structure, including ① clean wet steam, ② clean saturated steam, ③ clean superheated steam, and ④ clean superheated steam. Attached Figure Description

[0024] Figure 1 This is a front elevation view of the present invention;

[0025] Figure 2 This is the right elevation view of this utility model;

[0026] Figure 3 This is a rear elevation view of the present invention;

[0027] Figure 4 This is a top view of the present invention;

[0028] Figure 5 This is a right elevation view of the internal structure of this utility model;

[0029] Figure 6 This is a top view of the internal structure of this utility model;

[0030] Figure 7 This is a right sectional view of the internal structure of this utility model;

[0031] Figure 8 This is a top sectional view of the internal structure of this utility model;

[0032] In the diagram: 1. Water-cooled premixed low-NOx burner; 2. High-temperature flue gas heat exchanger; 3. Steam-water separator; 4. Low-temperature flue gas heat exchanger; 5. Flue gas condenser; 6. Feedwater storage tank; 7. Evaporator feedwater pump; 8. Tube-side water-cooled tube bundle feedwater pump; 9. Housing base; 10. Electrical control box; 11. Fan; 12. Air filter; 13. Gas connection pipe; 14. Gas valve assembly; 15. Gas regulating butterfly valve; 16. Premixing chamber; 17. Mixed gas equalization plate; 18. Mixed gas equalization chamber; 19. Tube-side water-cooled combustion tube bundle; 20. Flame monitoring device; 21. Observation hole; 22. Exhaust port; 23. Mixed gas equalization chamber pressure... 24. Combustion chamber pressure measuring hole; 25. Condenser flue gas pressure measuring hole; 26. Exhaust gas temperature measuring hole; 27. Flue gas condensate drain pipe; 28. Water inlet; 29. ​​Feedwater pump outlet pressure measuring hole for tube-side water-cooled tube bundle; 30. Feedwater storage tank exhaust port; 31. Feedwater storage tank temperature measuring hole; 32. Feedwater storage tank drain port; 33. Feedwater pump outlet check valve; 34. Low-temperature flue gas heat exchanger exhaust port; 35. Safety valve connection pipe; 36. Steam valve connection pipe; 37. Steam temperature measuring hole; 38. Steam pressure pipe seat; 39. Water level connecting pipe; 40. Steam-water separator drain port; 41. Ultra-low water level electrode; 42. Water level gauge. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] like Figures 1 to 8 As shown, a fully premixed water-cooled steam generator includes a shell and a base. The shell is hollow to provide space for the installation of various components. The base is fixed to the bottom of the shell and serves to support and stabilize the device. Inside the shell are a water-cooled premixed low-NOx burner 1, a high-temperature flue gas heat exchanger 2, a steam-water separator 3, a low-temperature flue gas heat exchanger 4, a flue gas condenser 5, a feedwater storage tank 6, an evaporator feedwater pump 7, and a tube-side water-cooled tube bundle feedwater pump 8. These components cooperate with each other to complete the steam generation process.

[0036] The water-cooled premixed low-NOx burner 1, high-temperature flue gas heat exchanger 2, steam-water separator 3, low-temperature flue gas heat exchanger 4, and flue gas condenser 5 are installed sequentially from left to right inside the shell, and are connected and fixed in pairs by flanges. This layout allows the flue gas to pass through each heat exchange component in sequence along a predetermined path, achieving full heat exchange and improving energy utilization efficiency. At the same time, the flange connection facilitates the installation, disassembly, and maintenance of each component.

[0037] The evaporator feed water pump 7 is located on the front of the flue gas condenser 5 and is responsible for transporting water from the flue gas condenser 5 to the evaporator for evaporation. The tube-side water-cooled tube bundle feed water pump 8 is located on the front of the high-temperature flue gas heat exchanger 2 and is used to provide cooling water to the tube-side water-cooled tube bundle. The feed water storage tank 6 is located on the right side of the evaporator feed water pump 7 and is used to store feed water to ensure a stable water supply for the system.

[0038] The water-cooled premixed low-NOx burner 1 includes a fan 11. The air inlet of the fan 11 is equipped with an air filter 12, which can effectively filter dust and impurities in the air entering the fan 11, ensuring that the air entering the premixing chamber 16 is clean and improving combustion efficiency. The air outlet of the fan 11 is equipped with a premixing chamber 16. The front of the premixing chamber 16 is equipped with a gas valve assembly 14. The top of the gas valve assembly 14 is equipped with a gas pipe 13. A gas regulating butterfly valve 15 and its actuator are provided between the gas valve assembly 14 and the fan 11. By adjusting the opening of the gas regulating butterfly valve 15, the amount of gas entering the premixing chamber 16 can be precisely controlled, thereby achieving a reasonable gas ratio.

[0039] A gas equalization chamber 18 is provided on the right side of the premixing chamber 16. A gas equalization plate 17 is provided at the connection between the gas equalization chamber 18 and the premixing chamber 16. The gas equalization plate 17 can make the gas mixture entering the gas equalization chamber 18 from the premixing chamber 16 more uniform, ensuring the stability of combustion. A combustion chamber is provided on the side of the gas equalization chamber 18. An ignition and flame detection device is provided in the combustion chamber to ignite the gas mixture and detect the flame status in real time to ensure the safety and reliability of the combustion process. An observation hole 21 is provided on the front of the combustion chamber for the operator to observe the combustion situation in the combustion chamber. A tube-side water-cooled combustion tube bundle 19 is provided between the combustion chamber and the gas equalization chamber 18. The tube-side water-cooled combustion tube bundle 19 can effectively reduce the temperature of the combustion chamber, reduce the generation of nitrogen oxides, and achieve low-NOx combustion.

[0040] The front of the mixed gas equalization chamber 18 is provided with a mixed gas equalization chamber pressure measuring hole 23 for measuring the pressure inside the mixed gas equalization chamber 18. The front of the combustion chamber is provided with a combustion chamber pressure measuring hole 24, which can monitor the pressure changes inside the combustion chamber in real time to ensure the stability of the combustion process.

[0041] The flue gas condenser 5 has a flue gas outlet 22 on its side for discharging the gas inside the low-temperature flue gas heat exchanger 4. The front of the flue gas condenser 5 has a condenser flue gas pressure measuring hole 25 for measuring the flue gas pressure inside the flue gas condenser 5. The upper side wall of the flue gas outlet 22 has a flue gas temperature measuring hole 26 for measuring the flue gas temperature. By monitoring the flue gas temperature, the thermal efficiency of the equipment can be understood. The side wall of the flue gas condenser 5 also has a flue gas condensate drain pipe 27 for discharging the condensate generated by flue gas condensation.

[0042] The steam-water separator 3 is equipped with a water level gauge 42 on its front side, which can display the water level in the steam-water separator 3 in real time, making it easy for operators to monitor water level changes and adjust the water supply in a timely manner. The top of the water supply tank 6 is equipped with a water supply tank vent 30, the bottom of the water supply tank 6 is equipped with a water supply tank drain 32, and the middle of the water supply tank 6 is equipped with a water supply tank temperature measuring hole 31, which can be used to discharge gas, discharge dirt and measure water temperature in the water supply tank 6, respectively.

[0043] The input end of the tube-side water-cooled tube bundle feed pump 8 is provided with a water inlet 28, and the output end of the tube-side water-cooled tube bundle feed pump 8 is provided with a tube-side water-cooled tube bundle feed pump outlet pressure measuring hole 29, which can monitor the outlet pressure of the tube-side water-cooled tube bundle feed pump 8 in real time to ensure the normal supply of cooling water. The top of the low-temperature flue gas heat exchanger 4 is provided with a low-temperature flue gas heat exchanger exhaust port 34, and the steam-water separator 3 is provided with a steam-water separator drain port 40, which can periodically discharge the dirt in the steam-water separator 3 to ensure the steam-water separation effect.

[0044] An electrical control box 10 is located on the left side of the housing. The electrical control box 10 contains control components for controlling the entire equipment. Through the control components in the electrical control box 10, automated control of various components such as the fan 11, water pump, and ignition device can be achieved. The operating parameters of each component can be adjusted in real time according to the operating status of the equipment to ensure efficient and stable operation of the equipment.

[0045] The working principle of this utility model is as follows: Flue gas side:

[0046] Combustion air enters the housing through openings at the rear of the housing and base. The continuous flow of combustion air not only helps the equipment dissipate heat, but also preheats the combustion air, thereby improving thermal efficiency. The combustion air entering the housing passes through the air filter 12, enters the fan 11 for pressurization, and then enters the premixing chamber 16. Natural gas passes through the gas pipe 13, gas valve group 14, gas regulating butterfly valve 15, and actuator in sequence to enter the premixing chamber 16. After being fully mixed with the combustion air, a mixed gas is formed.

[0047] The mixed gas enters the mixed gas equalization chamber 18 through the mixed gas equalization plate 17 and then passes through the tube-side water-cooled combustion tube bundle 19 before combustion.

[0048] The gas equalization plate 17 was designed and optimized through experiments based on the design aided by calculation software, which resulted in a low degree of premixing of the gas in the gas equalization chamber 18, uniform and stable pressure, and ensured stable combustion.

[0049] The tube-side water-cooled combustion tube bundle 19 is equipped with an ignition and flame monitoring device 20 and a flame observation hole 21. After the mixed gas passes through the tube-side water-cooled combustion tube bundle 19, it begins to burn. The tube-side water-cooled combustion tube bundle 19 absorbs some heat and reduces the combustion temperature.

[0050] The combustion flue gas passes through the high-temperature flue gas heat exchanger 2, the steam-water separator 3, the low-temperature flue gas heat exchanger 4, and the flue gas condenser 5, and exchanges heat with the tube bundles in the above components. Finally, it is discharged through the flue gas outlet 22. The flue gas condensate formed by natural gas combustion is discharged through the flue gas condensate drain pipe 27.

[0051] In addition, the water-cooled premixed low-NOx burner 1, flue gas condenser 5 and other components are equipped with measuring holes such as the mixed gas equalization chamber pressure measuring hole 23, the combustion chamber pressure measuring hole 24, the condenser flue gas pressure measuring hole 25, and the exhaust gas temperature measuring hole 26, which are used to monitor the combustion status in real time, and automatically adjust the frequency of the fan 11 and the opening degree of the gas regulating butterfly valve 15 and the actuator through the electrical control box 10 and control accessories.

[0052] Water supply preheating process (slight positive pressure < 0.1 MPa):

[0053] Water is pressurized by entering the tube-side water-cooled tube bundle water supply pump 8 through the inlet 28. The tube-side water-cooled tube bundle water supply pump 8 operates by frequency conversion and constant pressure by relying on the tube-side water-cooled tube bundle water supply pump outlet pressure measuring hole 29 set on its outlet. The constant pressure is 0.06~0.08MPa.

[0054] The tube-side water-cooled tube bundle feed water pump 8 delivers feed water to the tube-side water-cooled combustion tube bundle 19 of the water-cooled premixed low-NOx burner 1, and then delivers it to the flue gas condenser through the connecting pipe. The pressurized and heat-absorbing feed water enters the feed water storage tank 6 from the outlet of the flue gas condenser 5 and is then delivered to the evaporator feed water pump 7, from the inlet 28 to the inlet of the evaporator feed water pump 7.

[0055] Soft drink production process:

[0056] The preheated high-temperature feedwater is pressurized by the evaporator feedwater pump 7, and after passing through the feedwater pump outlet check valve 33, it enters the heat exchange tube bundles of the low-temperature flue gas heat exchanger 4, the high-temperature flue gas heat exchanger 2, and the steam-water separator 3 in sequence. Finally, stable steam is formed in the steam-water separator 3 and output through the steam valve connecting pipe 36 and the pipe seat.

[0057] Water level control and steam quality control:

[0058] The electrical control box 10 and control accessories control the operating frequency of the evaporator water pump 7 through the water level height feedback from the water level gauge 42, so that the water level is in a dynamically stable state.

[0059] The electrical control box 10 and control accessories monitor the liquid level in the steam-water separator 3, as well as the output steam temperature and pressure, through the water level gauge 42, steam temperature measuring hole 37, and steam pressure pipe seat 38 during operation; and can output clean wet steam, clean saturated steam, clean superheated steam, and clean superheated steam respectively by setting relevant parameters according to steam demand.

[0060] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A fully premixed water-cooled steam generator, comprising a shell and a base, wherein the shell is hollow inside, and the base is fixed to the bottom of the shell, characterized in that, The shell contains a water-cooled premixed low-NOx burner (1), a high-temperature flue gas heat exchanger (2), a steam-water separator (3), a low-temperature flue gas heat exchanger (4), a flue gas condenser (5), a water supply tank (6), an evaporator water supply pump (7), and a tube-side water-cooled tube bundle water supply pump (8). The water-cooled premixed low-NOx burner (1), high-temperature flue gas heat exchanger (2), steam-water separator (3), low-temperature flue gas heat exchanger (4) and flue gas condenser (5) are installed inside the shell from left to right, and are connected and fixed in pairs by flanges. The evaporator feed water pump (7) is located on the front of the flue gas condenser (5), the tube-side water-cooled tube bundle feed water pump (8) is located on the front of the high-temperature flue gas heat exchanger (2), and the feed water storage tank (6) is located on the right side of the evaporator feed water pump (7).

2. The fully premixed water-cooled steam generator according to claim 1, characterized in that: The water-cooled premixed low-NOx burner (1) includes a fan (11), an air filter (12) at the air inlet of the fan (11), a premixing chamber (16) at the air outlet of the fan (11), a gas valve group (14) on the front of the premixing chamber (16), a gas pipe (13) at the top of the gas valve group (14), and a gas regulating butterfly valve (15) between the gas valve group (14) and the fan (11). A gas equalization chamber (18) is provided on the right side of the premixing chamber (16). A gas equalization plate (17) is provided at the connection between the gas equalization chamber (18) and the premixing chamber (16). A combustion chamber is provided on the side of the gas equalization chamber (18). An ignition and flame detection device is provided in the combustion chamber. A fire observation hole (21) is provided on the front of the combustion chamber. A tube-side water-cooled combustion tube bundle (19) is provided between the combustion chamber and the gas equalization chamber (18).

3. The fully premixed water-cooled steam generator according to claim 2, characterized in that: The front of the mixed gas equalization chamber (18) is provided with a mixed gas equalization chamber pressure measuring hole (23), and the front of the combustion chamber is provided with a combustion chamber pressure measuring hole (24). The flue gas condenser (5) has a flue gas outlet (22) on its side, a condenser flue gas pressure measuring hole on its front, a flue gas temperature measuring hole (26) on the upper side wall of the flue gas outlet (22), and a flue gas condensate drain pipe (27) on the side wall of the flue gas condenser (5).

4. A fully premixed water-cooled steam generator according to claim 3, characterized in that: The steam-water separator (3) is provided with a water level gauge (42) on the front, the water supply tank (6) is provided with a water supply tank exhaust port (30) at the top, the water supply tank (6) is provided with a water supply tank drain port (32) at the bottom, and the water supply tank (6) is provided with a water supply tank temperature measuring hole (31) in the middle. The input end of the tube-side water-cooled tube bundle water pump (8) is provided with a water inlet (28), the output end of the tube-side water-cooled tube bundle water pump (8) is provided with a tube-side water-cooled tube bundle water pump outlet pressure measuring hole (29), the top of the low-temperature flue gas heat exchanger (4) is provided with a low-temperature flue gas heat exchanger exhaust port (34), and the steam-water separator (3) is provided with a steam-water separator drain port (40).

5. A fully premixed water-cooled steam generator according to claim 4, characterized in that: An electrical control box (10) is provided on the left side of the housing, and the electrical control box (10) contains control accessories for controlling the entire equipment.

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