Converter / heating furnace evaporation cooling system combined with heat absorption type heat pump

Abstract

The invention discloses a converter / heating furnace evaporation cooling system combined with a heat absorption type heat pump. Comprising a deaerator supplementing water through a water supplementing pipeline, and a heat absorption type heat pump is coupled to the water supplementing pipeline so that the water supplementing temperature of the deaerator of the system can be increased by 30-50 DEG C. The heat absorption type heat pump takes steam generated by a vaporization system or continuous pollution discharge flash steam as a driving heat source and is used for heating system deoxygenization water supplement so as to raise the temperature of the system water supplement by 30-50 DEG C. According to the system, low-temperature waste heat is taken from low-temperature waste heat which is difficult to utilize in the production process of the converter or the heating furnace, the waste heat recovery level is effectively improved, and the steam yield of the system is improved; and meanwhile, the problem that a conventional converter / heating furnace system is poor in deoxidizing effect is solved.

Description

Technical Field

[0001] The invention relates to a converter / heating furnace vaporization cooling system combined with a heat absorption heat pump. Background Art

[0002] The converter / heating furnace vaporization system is one of the primary methods for recovering medium- and high-pressure waste heat resources in the steel industry. Due to the nature of this waste heat resource, conventional methods such as setting up heat exchange surfaces to preheat the system's deaerator and feed water cannot be used. The feed water typically enters the deaerator directly at room temperature. Since the feed water temperature is typically comparable to the ambient temperature (≤40°C), it is much lower than the deaerator's operating temperature (approximately 102°C for atmospheric deaerators and approximately 130°C for medium-pressure deaerators). This results in poor deaerator operation, incomplete deoxidation, substandard steam quality, and increased corrosion in the vaporization system, all of which require urgent solutions.

[0003] In addition, a large amount of low-temperature waste heat (such as circulating cooling water waste heat) generated during the production process of converters / heating furnaces has not been effectively utilized. Under the current steel industry's "extreme energy efficiency" action requirements, it is urgent to explore ways to utilize this part of low-temperature waste heat. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a converter / heating furnace vaporization cooling system combined with an endothermic heat pump.

[0005] To achieve the above-mentioned objectives, the converter / heating furnace vaporization cooling system combined with an endothermic heat pump of the present invention includes a deaerator that is replenished with water through a water replenishment pipe, wherein an endothermic heat pump is coupled to the water replenishment pipe to increase the system deaerator replenishment water temperature by 30°C to 50°C.

[0006] Furthermore, the absorption heat pump uses steam generated by the vaporization system or continuous blowdown flash steam as a driving heat source to heat the system's deoxygenated feed water, raising the system feed water temperature by 30°C to 50°C. This absorption heat pump, a first-class absorption heat pump, typically has a coefficient of performance (COP) between 1.6 and 2.2, effectively heating the system feed water while recovering a significant amount of low-temperature waste heat.

[0007] Furthermore, the driving heat source drives the steam condensate to flow back to the deaerator by gravity after the heat is taken out by the heat pump, and no condensate is discharged to cause waste of resources.

[0008] In this invention, low-temperature waste heat is extracted from the difficult-to-use low-temperature waste heat (such as circulating water waste heat) that accompanies the production process of converters or heating furnaces. This waste heat is typically discharged directly without being utilized due to its difficulty in recovery. The system of this invention effectively improves waste heat recovery and increases system steam production. This system raises the temperature of the deoxygenating feed water in the vaporization system by 30°C to 50°C, effectively reducing the internal heating requirements of the deaerator and addressing the poor deoxygenation performance of conventional converter / heating furnace systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of a system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0010] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0011] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0012] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0013] The following will be combined with the Figure 1 The technical solution of the present invention is described in detail in conjunction with a converter vaporization cooling system with a rated steam production of 50 t / h and an embodiment of an absorption heat pump.

[0014] The system couples an absorption heat pump (1) to the deoxidation and water supply pipeline (5) (6) of the conventional converter / heating furnace cooling system, and includes heat pump driven steam (3), a low-temperature waste heat source (2), etc.

[0015] In conventional converter / heating furnace cooling systems, the system feed water is directly fed into the deaerator (4) without preheating. The feed water temperature is usually equivalent to the ambient temperature (≤40°C), which is much lower than the operating temperature of the deaerator (4) (the atmospheric deaerator temperature is about 102°C, and the medium-pressure deaerator temperature is about 130°C). The deaerator operation control is relatively difficult, which can easily lead to problems such as poor deoxidation effect. The system uses an absorption heat pump to increase the feed water temperature from ≤40°C (5) to ≤70-90°C (6), greatly reducing the operating load of the deaerator and facilitating the deoxidation effect.

[0016] After the driving steam (3) is heated by the heat pump (1), the steam condensate (7) flows back to the deaerator (4) by gravity. No condensate is discharged to cause waste of resources, and the residual heat of the condensate can be effectively utilized by the deaerator without heat loss.

[0017] The first type of the absorption heat pump is a steam absorption heat pump, and the coefficient of performance (COP) of the heat pump is usually between 1.6 and 2.2. It can effectively heat the system water and recover considerable low-temperature waste heat resources.

[0018] Based on a case study, the rated steam production capacity of the vaporization system without a heat pump is 50 t / h, and the water supply is approximately 55 t / h. After integrating the heat pump system, the heat pump temperature is raised to 30°C, the driving steam is taken from the saturated steam produced by the vaporization system (pressure ~0.8 MPa), the heat pump coefficient of performance (COP) is 1.7, and the low-temperature waste heat is calculated from the large amount of circulating cooling water generated during the converter production process. Although the heat pump system consumes approximately 1.6 t / h of driving steam, a comprehensive analysis of the overall vaporization system produces an additional 1.2 t / h of steam, bringing the total steam production to 51.2 t / h, an increase of 2.4%. Approximately 700 kW of low-temperature waste heat is recovered, achieving significant energy-saving and efficiency-enhancing effects.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0020] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0021] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A converter / heating furnace vaporization cooling system combined with an endothermic heat pump, characterized by: The invention comprises a deaerator which is replenished with water through a water replenishment pipe, wherein a heat absorption heat pump is coupled to the water replenishment pipe to increase the replenishment temperature of the system deaerator by 30°C to 50°C.

2. The converter / heating furnace vaporization cooling system combined with an endothermic heat pump according to claim 1, characterized in that: The heat absorption heat pump uses the steam produced by the vaporization system or the continuous blowdown flash steam as the driving heat source, and is used to heat the system deoxygenation and water supply to increase the system water supply temperature by 30°C to 50°C.

3. The converter / heating furnace vaporization cooling system combined with an endothermic heat pump according to claim 2, characterized in that: The driving heat source drives the steam condensate to flow back to the deaerator by gravity after taking heat through the heat pump, and no condensate is discharged.

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