Waste heat recovery system of steam source

Abstract

The utility model discloses a waste heat recovery system of a steam source, which comprises a water-cooling air-cooling burner, a boiler body, an energy saver and an air preheater, the air preheater is provided with a first air inlet end, a second air inlet end and an air outlet end, and an air outlet cylinder of the energy saver is communicated with the first air inlet end. High-temperature flue gas generated by combustion of the water-cooling and air-cooling combustor is introduced into the boiler body to heat pressure-bearing hot water in the boiler body, the use amount of combustion gas by the boiler body is reduced, meanwhile, high-temperature flue gas flowing out of the boiler body enters the energy saver, secondary heat exchange is conducted on the high-temperature flue gas, heat is conveyed to the boiler body, and the energy is saved. And then the formed low-temperature flue gas is fed into the air preheater to preheat cold air entering from the second air inlet end of the air preheater, so that combustion of combustion gas is more sufficient, recycling of the high-temperature flue gas is more sufficient, more energy is saved, and meanwhile nitrogen emission is reduced.

Description

Technical Field

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

[0002] In the existing technology, boiler manufacturers produce pressurized hot water through steam boilers in the production process, and generate high-temperature flue gas. The high-temperature flue gas is directly discharged, resulting in a large amount of energy loss. If a preheating recovery treatment device is added, the company's production cost will increase. Therefore, it is necessary to recycle the high-temperature flue gas. With the changes in petrochemical energy and the promotion of "dual carbon", it is also necessary to reduce carbon emissions.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The utility model provides a waste heat recovery system for a steam source.

[0005] This application provides the following technical solutions:

[0006] A waste heat recovery system for a steam source, comprising:

[0007] A water-cooled air-cooled burner, which is used to burn the combustion gas entering it and generate heat to form a heat source. The water-cooled air-cooled burner has an air inlet and an air outlet;

[0008] The boiler body has an air inlet pipe and an air outlet pipe, and the air inlet pipe of the boiler body is connected to the air outlet of the water-cooled and air-cooled burner, so that the heat and high-temperature flue gas generated by the water-cooled and air-cooled burner can flow through the boiler body and discharge the relatively high-temperature flue gas through the air outlet pipe;

[0009] The economizer has an air inlet and an air outlet. The air inlet of the economizer is connected to the air outlet pipe of the boiler body. The economizer is used to perform secondary heat exchange on the relatively high-temperature flue gas to form low-temperature flue gas.

[0010] The air preheater has a first air inlet end, a second air inlet end and an air outlet end. The air outlet tube of the economizer is connected to the first air inlet end, the second air inlet end is connected to the outside, and the air outlet end is connected to the air inlet of the water-cooled and air-cooled burner.

[0011] Furthermore, it also includes a fan, and the air inlet end of the fan is connected to the air outlet end of the air preheater.

[0012] Furthermore, the air outlet end of the fan is connected to a premixer through an air duct, and the premixer is communicated with an air inlet of the water-cooled and air-cooled burner.

[0013] Furthermore, the fan, the air preheater, the air duct, the economizer, the premixer, the boiler body and the water-cooled and air-cooled burner are connected via flanges.

[0014] By adopting the above technical solution, the utility model has the following beneficial effects:

[0015] The high-temperature flue gas generated by the combustion of the water-cooled and air-cooled burners is passed into the boiler body to heat the pressurized hot water in the boiler body, reducing the boiler body's use of combustion gas. At the same time, the higher-temperature flue gas flowing out of the outside of the boiler body enters the economizer, and the higher-temperature flue gas is subjected to secondary heat exchange and the heat is transferred to the boiler body. The formed low-temperature flue gas is then sent to the air preheater to preheat the cold air entering through the second air inlet end of the air preheater, so that the combustion of the combustion gas is more complete, and the recovery and utilization of the high-temperature flue gas is more complete, more energy-saving, and nitrogen emissions are also reduced.

[0016] 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

[0017] 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:

[0018] Figure 1 A schematic structural diagram of a waste heat recovery system for a steam source provided in this embodiment.

[0019] Figure numerals: 1. fan; 2. air preheater; 3. air duct; 4. economizer; 5. premixer; 6. boiler body; 7. water-cooled and hot air burners.

[0020] 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

[0021] See also Figure 1As shown, the embodiment of the present application provides a waste heat recovery system for a steam source, including a water-cooled air-cooled burner 7, a boiler body 6, an economizer 4 and an air preheater 2. The water-cooled air-cooled burner 7 is used to burn the combustion gas entering it and generate heat to form a heat source. The water-cooled air-cooled burner 7 has an air inlet and an air outlet, and the boiler body 6 has an air inlet pipe and an air outlet pipe. The air inlet pipe of the boiler body 6 is connected to the air outlet of the water-cooled air-cooled burner 7, so that the heat generated by the combustion of the water-cooled air-cooled burner 7 is connected to the air outlet of the water-cooled air-cooled burner 7. The high-temperature flue gas flows through the interior of the boiler body 6 and flows out through the outlet pipe to form higher-temperature flue gas. The economizer 4 has an air inlet and an air outlet. The air inlet of the economizer 4 is connected to the outlet pipe of the boiler body 6. The economizer 4 is used to perform secondary heat exchange on the higher-temperature flue gas to form low-temperature flue gas. The air preheater 2 has a first air inlet end, a second air inlet end and an air outlet end. The air outlet of the economizer 4 is connected to the first air inlet end, the second air inlet end is connected to the outside, and the air outlet end is connected to the air inlet of the water-cooled and air-cooled burner 7.

[0022] In the above scheme, the high-temperature flue gas generated by the combustion of the water-cooled and air-cooled burners 7 is passed into the boiler body 6 to heat the pressurized hot water in the boiler body 6, thereby reducing the amount of combustion gas used by the boiler body 6. At the same time, the higher-temperature flue gas flowing out of the outside of the boiler body 6 enters the economizer 4, and the higher-temperature flue gas is subjected to secondary heat exchange and the heat is transferred to the boiler body 6. The formed low-temperature flue gas is then sent to the air preheater 2 to preheat the cold air entering through the second air inlet end of the air preheater 2, thereby making the combustion of the combustion gas more complete, and making the recovery and utilization of the high-temperature flue gas more complete, more energy-saving, and also reducing nitrogen emissions.

[0023] See also Figure 1 As shown, the waste heat recovery system of the steam source provided in the embodiment of the present application also includes a fan 1, the air inlet end of the fan 1 is connected to the air outlet end of the air preheater 2, and the fan 1 is used to increase the pressure of the air and the flue gas entering therein to facilitate the circulation of the air and the flue gas entering therein.

[0024] See also Figure 1 As shown, the air outlet end of the fan 1 is connected to a premixer 5 through an air duct 3, and the premixer 5 is connected to the air inlet of the water-cooled and air-cooled burner 7. The premixer 5 is used to fully mix the air and the combustion gas.

[0025] The fan 1, the air preheater 2, the air duct 3, the economizer 4, the premixer 5, the boiler body 6 and the water-cooled and air-cooled burner 7 are connected through flanges.

[0026] The high-temperature flue gas generated by the combustion of the water-cooled and air-cooled burners 7 is passed into the boiler body 6 to heat the pressurized hot water in the boiler body 6, thereby reducing the consumption of the combustion gas by the boiler body 6. At the same time, the relatively high-temperature flue gas flowing out of the outside of the boiler body 6 enters the economizer 4, and the relatively high-temperature flue gas is subjected to secondary heat exchange and the heat is transferred to the boiler body 6. The formed low-temperature flue gas is then sent into the air preheater 2 to preheat the cold air entering through the second air inlet end of the air preheater 2, thereby making the combustion of the combustion gas more complete, and making the recycling of the high-temperature flue gas more complete, more energy-saving, and also reducing nitrogen emissions.

[0027] 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 waste heat recovery system for a steam source, characterized in that: include: A water-cooled air-cooled burner (7), the water-cooled air-cooled burner (7) being used to burn the combustion gas entering therein and generate heat to form a heat source, the water-cooled air-cooled burner (7) having an air inlet and an air outlet; A boiler body (6), the boiler body (6) having an air inlet pipe and an air outlet pipe, the air inlet pipe of the boiler body (6) being connected to the air outlet of the water-cooled and air-cooled burner (7), so that the heat and high-temperature flue gas generated by the water-cooled and air-cooled burner (7) can flow through the interior of the boiler body (6) and discharge the relatively high-temperature flue gas through the air outlet pipe; An economizer (4), the economizer (4) having an air inlet and an air outlet, the air inlet of the economizer (4) being connected to the air outlet pipe of the boiler body (6), the economizer (4) being used for performing secondary heat exchange on relatively high-temperature flue gas to form low-temperature flue gas; An air preheater (2), the air preheater (2) having a first air inlet end, a second air inlet end and an air outlet end, the air outlet tube of the economizer (4) being connected to the first air inlet end, the second air inlet end being connected to the outside, and the air outlet end being connected to the air inlet of the water-cooled and air-cooled burner (7).

2. The waste heat recovery system of the steam source according to claim 1, characterized in that: It also comprises a fan (1), the air inlet end of the fan (1) being connected to the air outlet end of the air preheater (2).

3. The waste heat recovery system of the steam source according to claim 2, characterized in that: The air outlet end of the fan (1) is connected to a premixer (5) via an air duct (3), and the premixer (5) is in communication with an air inlet of the water-cooled or air-cooled burner (7).

4. The waste heat recovery system of the steam source according to claim 3, characterized in that: The fan (1), air preheater (2), air duct (3), economizer (4), premixer (5), boiler body (6) and water-cooled and air-cooled burner (7) are connected via flanges.

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