Circulating heat exchange system of steam source

Abstract

The utility model discloses a circulation heat exchange system of a steam source. The circulation heat exchange system comprises a boiler body, a water-cooling air cold and hot air burner, an energy saver, an air preheater and a premixing device. Air entering through the air preheater and combustion gas in the premixer are mixed and fed into the water-cooling air cold and hot air combustor to be combusted, high-temperature flue gas generated by combustion enters the boiler body, high-temperature heat exchange is conducted on the high-temperature flue gas in the boiler body, and under the condition that the temperature of hot water is not changed, combustion of the combustion gas is reduced; the energy consumption is reduced, the emission of nitrogen is reduced, high-temperature flue gas is changed into relatively high-temperature flue gas through high-temperature heat exchange, the relatively high-temperature flue gas is subjected to secondary heat exchange in the energy saver and is changed into low-temperature flue gas, the low-temperature flue gas preheats cold air entering from an air inlet of the air preheater, and a circulating heat exchange system is formed, so that combustion gas in the premixer is combusted more sufficiently, and the combustion efficiency is improved. And meanwhile, the effective utilization of the generated high-temperature flue gas is improved, and the waste of energy is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steam boilers, in particular to a circulating heat exchange system of a steam source. Background Art

[0002] With the change of petrochemical energy and the implementation of "dual carbon", boiler manufacturers use steam boilers to produce pressurized hot water in the production process. Because the furnace structure is similar, the requirements for operation and emission, supervision and inspection, and use conditions are different, there are obvious differences in the product production process. It is difficult to unify and generalize the production process, and it is difficult to improve production efficiency.

[0003] In the prior art, the following problems exist in the process of producing pressurized hot water by burning combustion gas in boilers:

[0004] 1. Failure to fully premix with air results in incomplete combustion of natural gas, making it difficult to achieve the effect of low nitrogen and low consumption.

[0005] 2. The exhaust flue gas temperature is high, and the high-temperature flue gas cannot be utilized, resulting in a waste of energy.

[0006] In view of this, the present utility model is proposed. Utility Model Content

[0007] The utility model provides a circulating heat exchange system of a steam source.

[0008] This application provides the following technical solutions:

[0009] A circulating heat exchange system of a steam source, comprising:

[0010] include:

[0011] A boiler body, which is provided with an air inlet and an air outlet, and is used to heat water by burning gas;

[0012] A water-cooled air-cooled hot air burner, the air outlet of which is connected to the air inlet of the boiler body, so that the flue gas generated after the combustion gas entering the water-cooled air-cooled hot air burner is burned is sent into the boiler body;

[0013] The air inlet of the economizer is connected to the air outlet of the boiler body, so that the flue gas flowing through the boiler body flows into the economizer to recover the waste heat of the flue gas and form low-temperature flue gas;

[0014] An air preheater, wherein the air preheater is provided with a first air inlet, a second air inlet and an air outlet, the first air inlet of the air preheater is connected to the outside, and the second air inlet of the air preheater is connected to the air outlet end of the economizer;

[0015] The premixer is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe of the premixer is connected with the air outlet of the air preheater, and the air outlet pipe of the premixer is connected with the air inlet of the water-cooled air hot air burner.

[0016] Furthermore, it also includes a fan, and the air inlet of the fan is connected to the air outlet of the air preheater.

[0017] Furthermore, the air outlet of the fan is connected to the air inlet duct of the premixer through an air duct.

[0018] Furthermore, it also includes an electric heater system, which is arranged on the boiler body, and the water inlet and the water outlet of the electric heater system are respectively connected to the boiler body.

[0019] Further, the water-cooled hot air burner includes a burner body;

[0020] An air-cooled burner head is arranged at one end of the burner body, and a voltage stabilizing plate is arranged at the other end. An upper horizontal water-cooled convection tube is arranged on the air-cooled burner head. Both ends of the water-cooled convection tube are connected with side water-cooled wall tubes. One end of the two side water-cooled wall tubes close to the water-cooled convection tube is connected with an upper water-cooled header, and one end of the two side water-cooled wall tubes away from the water-cooled convection tube is connected with a lower water-cooled header. The upper water-cooled header and the lower water-cooled header are connected with front water-cooled wall tubes.

[0021] Furthermore, an air inlet is provided on the burner body to deliver the mixed gas into the air-cooled burner head.

[0022] Furthermore, one end of the burner body facing away from the air-cooled burner head is connected to the boiler body through a mounting connection flange.

[0023] By adopting the above technical solution, the utility model has the following beneficial effects:

[0024] Through the premixer that is set up, the air entering through the air preheater is mixed with the combustion gas inside the premixer and sent to the water-cooled hot air burner for combustion. The high-temperature flue gas generated by the combustion enters the boiler body, so that the high-temperature flue gas undergoes high-temperature heat exchange in the boiler body. Under the condition that the hot water temperature remains unchanged, the combustion of the combustion gas is reduced, the energy consumption is reduced, and the nitrogen emission is reduced. The high-temperature heat exchange turns the high-temperature flue gas into a higher-temperature flue gas, which undergoes secondary heat exchange in the economizer and becomes low-temperature flue gas. The low-temperature flue gas preheats the cold air entering from the air inlet of the air preheater and forms a circulating heat exchange system, which makes the combustion gas in the premixer burn more fully. At the same time, it improves the effective utilization of the generated high-temperature flue gas and reduces energy waste.

[0025] The specific implementation modes of the present utility model are further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are part of this application and are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0027] Figure 1 A schematic diagram of the structure of the circulating heat exchange system of the steam source provided in this embodiment;

[0028] Figure 2 A schematic diagram of the structure of a water-cooled, air-cooled, hot-air burner of a circulating heat exchange system for a steam source provided in this embodiment;

[0029] Figure 3 A front view of a water-cooled, air-cooled, and hot-air burner of a circulating heat exchange system for a steam source provided in this embodiment;

[0030] Figure 4 for Figure 2 Another perspective structural schematic diagram of the water-cooled and air-cooled hot air burner of the steam source circulation heat exchange system provided.

[0031] Figure numerals: 1. fan; 2. air preheater; 3. air duct; 4. economizer; 5. premixer; 6. boiler body; 7. water-cooled air-cooled hot air burner; 8. electric heater system; 9. burner body; 10. air inlet; 11. mounting connection flange; 12. upper water-cooled header; 13. lower water-cooled header; 14. side water-cooled wall tube; 15. front water-cooled wall tube; 16. air-cooled burner head; 17. water-cooled convection tube; 18. voltage stabilizer plate.

[0032] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] See also Figures 1 to 4As shown, the embodiment of the present application provides a circulating heat exchange system of a steam source, including a boiler body 6, a water-cooled air-cooled hot air burner 7, an economizer 4, an air preheater 2 and a premixer 5. An air inlet end and an air outlet end are provided on the boiler body 6. The boiler body 6 is used to heat water by combustion gas. The air outlet of the water-cooled air-cooled hot air burner 7 is communicated with the air inlet end of the boiler body 6, so that the flue gas generated after the combustion gas entering the water-cooled air-cooled hot air burner 7 is burned is sent into the boiler body 6. The high-temperature flue gas performs high-temperature heat exchange in the boiler body 6 to utilize thermal energy to form a higher-temperature flue gas. The air inlet end of the economizer 4 is communicated with the air outlet end of the boiler body 6, so that the higher-temperature flue gas flowing through the boiler body 6 flows into the economizer 4. The economizer 4 recovers waste heat from the higher-temperature flue gas, forming a Low-temperature flue gas is formed. The air preheater 2 is provided with a first air inlet, a second air inlet and an air outlet. The first air inlet of the air preheater 2 is connected to the outside, and the second air inlet of the air preheater 2 is connected to the air outlet end of the economizer 4, so that the low-temperature flue gas flowing out of the economizer 4 enters the air preheater 2. The air preheater 2 performs deep heat exchange on the low-temperature flue gas to increase the temperature of the cold air entering through the first air inlet of the air preheater 2. The premixer 5 is provided with an air inlet pipe and an air outlet pipe. The air inlet pipe of the premixer 5 is connected to the air outlet of the air preheater 2, and the air outlet pipe of the premixer 5 is connected to the air inlet of the water-cooled hot and cold air burner 7. The premixer 5 is used to mix the heated air with the combustion gas inside the premixer 5 to improve the combustion efficiency of the combustion gas.

[0034] Hot air principle: The high-temperature flue gas generated by the water-cooled hot air burner 7 exchanges heat with the cold air entering through the air inlet of the air preheater 2, converting the cold air into hot air, which is then mixed with the combustion gas in the premixer 5 to improve the combustion efficiency of the combustion gas.

[0035] Air cooling principle: the combustion head of the water-cooled air-cooled hot air burner 7 is made of special metal material and has an air inlet and an air outlet. The combustion gas burns at the air inlet, and the generated radiant heat is absorbed by the combustion head of the water-cooled air-cooled hot air burner 7. The temperature of the combustion head of the water-cooled air-cooled hot air burner 7 increases. At the same time, the mixed gas entering the air inlet of the water-cooled air-cooled hot air burner 7 cools the combustion head to achieve the purpose of air cooling, ensuring the temperature and combustion temperature of the combustion head during the combustion process, and avoiding excessive combustion temperature of the combustion head to cause safety hazards.

[0036] In the above scheme, the air entering through the air preheater 2 is mixed with the combustion gas inside the premixer 5 through the premixer 5, and is sent to the water-cooled hot air burner 7 for combustion. The high-temperature flue gas generated by the combustion enters the boiler body 6, so that the high-temperature flue gas undergoes high-temperature heat exchange in the boiler body 6. When the hot water temperature remains unchanged, the combustion of the combustion gas is reduced, the energy consumption is reduced, and the nitrogen emission is reduced. The high-temperature heat exchange converts the high-temperature flue gas into a higher-temperature flue gas, which undergoes secondary heat exchange in the economizer 4 and becomes low-temperature flue gas. The low-temperature flue gas preheats the cold air entering the air inlet of the air preheater 2, and forms a circulating heat exchange system, so that the combustion gas in the premixer 5 burns more fully. At the same time, the effective utilization of the generated high-temperature flue gas is improved, and the waste of energy is reduced.

[0037] See also Figure 1 As shown, the circulating heat exchange system of the steam source provided in the embodiment of the present application also includes a fan 1, the air inlet of the fan 1 is connected to the air outlet of the air preheater 2, and the fan 1 is used to increase the pressure of the air flowing through to facilitate the air to enter the premixer 5.

[0038] See also Figure 1 As shown, the air outlet of the fan 1 is connected to the air inlet duct of the premixer 5 through the air duct 3.

[0039] See also Figure 1 As shown, the circulating heat exchange system of the steam source provided in the embodiment of the present application also includes an electric heater system 8, which is arranged on the boiler body 6, and the water inlet and the water outlet of the electric heater system 8 are respectively connected to the boiler body 6.

[0040] In the above scheme, when the boiler body 6 is not heated by combustion gas, the heat source is provided by the electric heater system 8, avoiding the need to replace or add equipment, and there is no need to dismantle any equipment. In order to reduce energy utilization and nitrogen emissions, the boiler body 6 can be appropriately heated by electric energy to reduce energy utilization and nitrogen emissions.

[0041] See also Figures 2 to 4 As shown, the water-cooled and air-cooled hot air burner 7 includes a burner body 9, an air-cooled burner head 16 is provided at one end of the burner body 9, and a voltage stabilizing plate 18 is provided at the other end. An upper horizontal water-cooled convection tube 17 is provided on the air-cooled burner head 16, and both ends of the water-cooled convection tube 17 are connected with side water-cooled wall tubes 14, and the ends of the two side water-cooled wall tubes 14 close to the water-cooled convection tube 17 are connected with an upper water-cooled header 12, and the ends of the two side water-cooled wall tubes 14 away from the water-cooled convection tube 17 are connected with a lower water-cooled header 13, and the upper water-cooled header 12 and the lower water-cooled header 13 are connected with a front water-cooled wall tube 15, and an air inlet 10 is provided on the burner body 9 to deliver the mixed gas into the air-cooled burner head 16.

[0042] The upper water cooling header 12 and the lower water cooling header 13 are respectively connected to the water system of the boiler body 6 to form a natural circulation system.

[0043] In the above scheme, the air preheated by the air preheater 2 is mixed with the combustion gas and enters the burner body 9 through the air inlet 10. After being stabilized by the voltage stabilizer 18, it enters the air-cooled combustion head 16 smoothly and evenly, and burns on the outer surface of the air-cooled burner head 16. A part of the heat generated by the combustion is sent into the furnace through the air-cooled burner head 16 and enters the boiler body 6 with the flue gas for heat exchange, and the other part is absorbed and exchanged by the upper water-cooled header 12, the lower water-cooled header 13 and the front water-cooled wall tube 15 of the water-cooled air-cooled hot air burner 7. In this process, the water in the upper water-cooled header 12, the lower water-cooled header 13 and the front water-cooled wall tube 15 absorbs heat, the density decreases and naturally rises, forming a natural circulation heat exchange system.

[0044] See also Figures 2 to 4 As shown, one end of the burner body 9 facing away from the air-cooled burner head 16 is connected to the boiler body 6 through the mounting connection flange 11.

[0045] Through the premixer 5, the air entering through the air preheater 2 is mixed with the combustion gas inside the premixer 5 and sent to the water-cooled hot air burner 7 for combustion. The high-temperature flue gas generated by the combustion enters the boiler body 6, so that the high-temperature flue gas undergoes high-temperature heat exchange in the boiler body 6. Under the condition that the hot water temperature remains unchanged, the combustion of the combustion gas is reduced, the energy consumption is reduced, and the nitrogen emission is reduced. The high-temperature heat exchange converts the high-temperature flue gas into a higher-temperature flue gas, which undergoes secondary heat exchange in the economizer 4 and becomes a low-temperature flue gas. The low-temperature flue gas preheats the cold air entering the air inlet of the air preheater 2 and forms a circulating heat exchange system, so that the combustion gas in the premixer 5 burns more fully. At the same time, the effective utilization of the generated high-temperature flue gas is improved, and the waste of energy is reduced.

[0046] This specific embodiment is merely an explanation of the utility model, and it is not a limitation of the utility model. After reading this specification, those skilled in the art can make non-creative modifications to the embodiment as needed, but as long as it is within the protection scope of the utility model, it is protected by the patent law.

Claims

1. A steam source circulation heat exchange system, characterized in that: include: A boiler body (6), wherein the boiler body (6) is provided with an air inlet end and an air outlet end, and the boiler body (6) is used to heat water by combustion gas; A water-cooled air-cooled hot air burner (7), wherein the air outlet of the water-cooled air-cooled hot air burner (7) is connected to the air inlet end of the boiler body (6) so as to deliver the flue gas generated after the combustion gas entering the water-cooled air-cooled hot air burner (7) is burned into the boiler body (6); An economizer (4), wherein the air inlet end of the economizer (4) is connected to the air outlet end of the boiler body (6), so that the flue gas flowing through the boiler body (6) flows into the economizer (4) to recover the waste heat of the flue gas and form low-temperature flue gas; An air preheater (2), wherein the air preheater (2) is provided with a first air inlet, a second air inlet and an air outlet, the first air inlet of the air preheater (2) being connected to the outside, and the second air inlet of the air preheater (2) being connected to the air outlet end of the economizer (4); A premixer (5), wherein the premixer (5) is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe of the premixer (5) is connected to the air outlet of the air preheater (2), and the air outlet pipe of the premixer (5) is connected to the air inlet of the water-cooled air hot air burner (7).

2. The circulating heat exchange system of the steam source according to claim 1, characterized in that: It also comprises a fan (1), the air inlet of the fan (1) being in communication with the air outlet of the air preheater (2).

3. The circulating heat exchange system of the steam source according to claim 2, characterized in that: The air outlet of the fan (1) is connected to the air inlet duct of the premixer (5) via an air duct (3).

4. The circulating heat exchange system of the steam source according to claim 1, characterized in that: It also comprises an electric heater system (8), wherein the electric heater system (8) is arranged on the boiler body (6), and a water inlet and a water outlet of the electric heater system (8) are respectively connected to the boiler body (6).

5. The circulating heat exchange system of the steam source according to claim 1, characterized in that: The water-cooled air-cooled hot air burner (7) comprises a burner body (9); An air-cooled burner head (16) is provided at one end of the burner body (9), and a voltage stabilizing plate (18) is provided at the other end. An upper horizontal water-cooled convection tube (17) is provided on the air-cooled burner head (16). Both ends of the water-cooled convection tube (17) are connected to side water-cooled wall tubes (14). The ends of the two side water-cooled wall tubes (14) close to the water-cooled convection tube (17) are connected to an upper water-cooled header (12). The ends of the two side water-cooled wall tubes (14) away from the water-cooled convection tube (17) are connected to a lower water-cooled header (13). The upper water-cooled header (12) and the lower water-cooled header (13) are connected to a front water-cooled wall tube (15).

6. The circulating heat exchange system of the steam source according to claim 5, characterized in that: The burner body (9) is provided with an air inlet (10) for delivering the mixed gas into the air-cooled burner head (16).

7. The circulating heat exchange system of the steam source according to claim 5 or 6, characterized in that: The end of the burner body (9) facing away from the air-cooled burner head (16) is connected to the boiler body (6) via a mounting connection flange (11).

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