Energy-saving blast dehumidification system for blast furnace

Abstract

The utility model discloses an energy-saving blast dehumidification system for a blast furnace. The energy-saving blast dehumidification system comprises a waste heat boiler, a first hot blast stove, a second hot blast stove, a first dehumidification unit and a second dehumidification unit, the first dehumidification unit comprises a first air blower, a first preheater, a first dehumidifier and a first heat exchanger which are connected in sequence; the second dehumidification unit comprises a second air blower, a second preheater, a second dehumidifier and a second heat exchanger which are connected in sequence; a blast furnace gas outlet of the first preheater is communicated with a gas inlet of the second hot-blast stove; a second preheater blast furnace gas outlet is communicated with a first hot blast stove gas inlet; the first heat exchanger air outlet is communicated with the first hot-blast stove air inlet; a second heat exchanger air outlet is communicated with a second hot-blast stove air inlet; and the first heat exchanger flue gas inlet and the second heat exchanger flue gas inlet are respectively communicated with the waste heat boiler flue gas outlet. According to the utility model, the amount of cooling water required for dehumidification behind the machine is reduced, and the effective recovery of heat is realized, so that the safety of the system can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnace dehumidification, and in particular relates to an energy-saving blast furnace blast dehumidification system. Background Art

[0002] Dehumidification and blasting is one of the methods for blast furnace energy saving and consumption reduction, and it also plays an important role in stabilizing the blast furnace condition. The existing blast furnace dehumidification is pre-machine dehumidification, and its principle is to use physical condensation method to dehumidify the air in front of the blast furnace blower. A heat exchange tube bundle is arranged in the dehumidifier located in front of the blast furnace blower. The air flows outside the tube and the cold water flows inside the tube. The air and the cold water exchange heat through the tube wall and condense the moisture in the air.

[0003] Existing blast furnace dehumidification includes pre-machine dehumidification and post-machine dehumidification. Among them, the defect of pre-machine dehumidification is that a refrigerator needs to be set up to provide low-temperature chilled water, and the refrigeration unit needs to consume a lot of electricity or heat energy. As a new dehumidification process, post-machine dehumidification can use normal temperature media, such as circulating water, river water or seawater to achieve cooling and dehumidification, without the need to set up a refrigerator to provide low-temperature chilled water, and has the characteristics of low operating cost and small footprint. However, the current post-machine dehumidification has the following defects: due to the high air pressure after the blast furnace blower is pressurized, the corresponding air temperature is also very high, and a large amount of cooling medium is required to reduce the air temperature and dehumidify, and a large amount of heat taken away by the cooling medium is not effectively utilized, resulting in a waste of energy; if a refrigerant is used to recover the heat taken away by the cooling medium, the operating pressure of the post-machine dehumidification system will be high, requiring perfect safety protection measures, which ultimately leads to high operating costs of the dehumidification system, large footprint, and poor system safety, which urgently needs to be improved. Utility Model Content

[0004] In view of the defects and shortcomings in the prior art, the utility model proposes an energy-saving blast furnace blast dehumidification system to solve the technical problems of high operating cost and poor system safety of the dehumidification system in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An energy-saving blast furnace blast dehumidification system comprises a waste heat boiler, a first hot blast stove, a second hot blast stove, a first dehumidification unit and a second dehumidification unit;

[0007] The first dehumidification unit comprises a first blower, a first preheater, a first dehumidifier and a first heat exchanger which are sequentially connected; the second dehumidification unit comprises a second blower, a second preheater, a second dehumidifier and a second heat exchanger which are sequentially connected;

[0008] The blast furnace gas outlet of the first preheater is connected to the air inlet of the second hot blast stove; the blast furnace gas outlet of the second preheater is connected to the air inlet of the first hot blast stove;

[0009] The air outlet of the first heat exchanger is connected to the air inlet of the first hot blast furnace; the air outlet of the second heat exchanger is connected to the air inlet of the second hot blast furnace; the smoke inlet of the first heat exchanger and the smoke inlet of the second heat exchanger are respectively connected to the smoke outlet of the waste heat boiler.

[0010] The utility model also has the following technical features:

[0011] Specifically, the water inlet of the first dehumidifier is connected to the first water pump via a first water supply pipe; the water inlet of the second dehumidifier is connected to the second water pump via a second water supply pipe.

[0012] Furthermore, the drain port of the first dehumidifier is connected to the first condensation water tank via a first condensation water pipe; the drain port of the second dehumidifier is connected to the second condensation water tank via a second condensation water pipe.

[0013] Furthermore, the blast furnace gas inlet of the first preheater is connected to a first blast furnace gas pipeline, and the blast furnace gas inlet of the second preheater is connected to a second blast furnace gas pipeline.

[0014] Furthermore, the smoke outlet of the first heat exchanger is also connected to a first discharge pipe; and the smoke outlet of the second heat exchanger is also connected to a second discharge pipe.

[0015] Furthermore, the air outlet of the first heat exchanger is communicated with the air inlet of the first hot blast stove, and the air outlet of the second heat exchanger is communicated with the air inlet of the second hot blast stove.

[0016] Furthermore, the hot gas outlet of the first hot blast stove and the hot gas outlet of the second hot blast stove are both connected to the air inlet of the blast furnace.

[0017] Compared with the prior art, the utility model has the following beneficial technical effects:

[0018] (1) The utility model can use normal temperature media, such as circulating water, river water or seawater, for cooling and dehumidification, without the need to set up a refrigerator to provide low-temperature chilled water, thereby reducing the operating cost of the device and reducing the floor space occupied.

[0019] (2) The utility model uses a preheater to preheat the blast furnace gas with the gas heat delivered by the blower, thereby reducing the amount of cooling water required for post-machine dehumidification and achieving effective heat recovery; there is no need to add new heat medium, thereby effectively improving the safety of the system; the utility model has a simple structure, is easy to operate, and has a strong value for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] The symbols in the figure represent:

[0022] 1-waste heat boiler, 2-first hot blast stove, 3-second hot blast stove, 4-first dehumidification unit, 5-second dehumidification unit;

[0023] 41-first blower, 42-first preheater, 43-first dehumidifier, 44-first heat exchanger, 45-first water supply pipeline, 46-first water pump, 47-first condensate pipeline, 48-first condensate tank, 49-first blast furnace gas pipeline;

[0024] 51 - second blower, 52 - second preheater, 53 - second dehumidifier, 54 - second heat exchanger, 55 - second water supply pipeline, 56 - second water pump, 57 - second condensate water pipeline, 58 - second condensate water tank, 59 - second blast furnace gas pipeline.

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0027] All components in the present invention, unless otherwise specified, are components known in the prior art.

[0028] The terms "upper", "lower", "front", "rear", etc. used in the present invention to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. "Inside" and "outside" refer to the inside and outside of the contour of the corresponding components, and the above terms cannot be understood as limitations on the present invention.

[0029] In the present invention, unless otherwise stated, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0030] Embodiment 1:

[0031] like Figure 1As shown, in accordance with the above technical scheme, this embodiment provides an energy-saving blast furnace blast dehumidification system, including a waste heat boiler 1, and also includes a first hot blast stove 2, a second hot blast stove 3, a first dehumidification unit 4 and a second dehumidification unit 5; the first dehumidification unit 4 and the second dehumidification unit 5 are both used for post-machine dehumidification.

[0032] The function of the first hot blast furnace 2 and the second hot blast furnace 3 is that during normal operation, the first hot blast furnace 2 and the second hot blast furnace 3 are always circulating in the two states of furnace burning and air supply. When the hot blast furnace is in the air supply state, the participation of blast furnace gas is not required, but the blower is always in operation. Therefore, if there is only one dehumidification unit and one hot blast furnace, the air compressed by the blower cannot be continuously dehumidified.

[0033] The first dehumidification unit 4 includes a first blower 41, a first preheater 42, a first dehumidifier 43 and a first heat exchanger 44 which are sequentially connected by means of pipelines, wherein the blast furnace gas outlet of the first preheater 42 is connected to the air inlet of the second hot blast furnace 3, and the blast furnace gas preheated by the first preheater 42 can enter the second hot blast furnace 3 through the pipeline; the blast furnace gas inlet of the first preheater 42 is connected to a first blast furnace gas pipeline 49 for conveying blast furnace gas. The blast furnace gas inlet of the second preheater 52 is connected to a second blast furnace gas pipeline 59, and the heat contained in the compressed air generated by the blower passes through the preheater to preheat the blast furnace gas.

[0034] The second dehumidification unit 5 includes a second blower 51, a second preheater 52, a second dehumidifier 53 and a second heat exchanger 54 which are sequentially connected by means of pipelines; the blast furnace gas outlet of the second preheater 52 is connected to the air inlet of the first hot blast furnace 2, and the blast furnace gas preheated by the second preheater 52 can enter the first hot blast furnace 2 through the pipeline, and the blast furnace gas inlet of the second preheater 52 is connected to the second blast furnace gas pipeline 59.

[0035] The air outlet of the first heat exchanger 44 is connected to the air inlet of the first hot blast furnace 2; the air outlet of the second heat exchanger 54 is connected to the air inlet of the second hot blast furnace 3, the flue gas inlet of the first heat exchanger 44 and the flue gas inlet of the second heat exchanger 54 are respectively connected to the flue gas outlet of the waste heat boiler 1, the air cooled and dehumidified by the first dehumidifier 43 enters the first heat exchanger 44, and then exchanges heat with the flue gas entering the first heat exchanger 44 from the waste heat boiler 1; the air cooled and dehumidified by the second dehumidifier 53 enters the second heat exchanger 54, and then exchanges heat with the flue gas entering the first heat exchanger 54 from the waste heat boiler 1.

[0036] As a preferred solution of this embodiment, the water inlet of the first dehumidifier 43 is connected to the first water pump 46 via the first water supply pipe 45, and the first water pump 46 is used to deliver normal temperature water, or other cooling medium (such as circulating water, river water or seawater) into the first dehumidifier 43; the water inlet of the second dehumidifier 53 is connected to the second water pump 56 via the second water supply pipe 55, and the second water pump 56 is used to deliver normal temperature water, or other cooling medium (such as circulating water, river water or seawater) into the second dehumidifier 53, and the drain port of the first dehumidifier 43 is connected to the first condensation water tank 48 via the first condensation water pipe 47; the drain port of the second dehumidifier 53 is connected to the second condensation water tank 58 via the second condensation water pipe 57, and the condensation water finally collected can be reused. Among them, the first dehumidifier 43 and the second dehumidifier 53 are both provided with a heat exchange unit and a defogger, which can realize heat exchange and gas-water separation. The first water supply pipe 45 , the second water supply pipe 55 , the first condensed water pipe 47 and the second condensed water pipe 57 are all provided with on-off valves.

[0037] As a preferred solution of this embodiment, the smoke outlet of the first heat exchanger 44 is also connected to a first exhaust pipe; the smoke outlet of the second heat exchanger 54 is also connected to a second exhaust pipe.

[0038] As a preferred solution of this embodiment, the air outlet of the first heat exchanger 44 is connected to the air inlet of the first hot blast stove 2 , and the air outlet of the second heat exchanger 54 is connected to the air inlet of the second hot blast stove 3 .

[0039] As a preferred solution of this embodiment, the hot gas outlet of the first hot blast furnace 2 and the hot gas outlet of the second hot blast furnace 3 are both connected to the blast furnace air inlet, and the high-temperature gases generated by the first hot blast furnace 2 and the second hot blast furnace 3 are finally sent into the blast furnace.

[0040] As a preferred solution of this embodiment, the high-temperature flue gas outlet of the first hot blast stove 2 and the high-temperature flue gas outlet of the second hot blast stove 3 are both connected to the waste heat boiler 1 .

[0041] The use process of the utility model is as follows:

[0042] Since the first hot blast furnace 2 and the second hot blast furnace 3 need to be continuously switched between the furnace burning state and the air supply state, the first dehumidification unit 4 and the second dehumidification unit 5 need to be provided.

[0043] When the first hot blast furnace 2 is in the air supply state, the second hot blast furnace 3 is in the furnace burning state, and the compressed air from the blower exchanges heat with the blast furnace gas flowing through the first preheater 42 in the first preheater 42, and the heated blast furnace gas enters the second hot blast furnace 3 through a pipeline for combustion, and the cooled compressed air enters the first dehumidifier 43, and exchanges heat with the normal temperature water sent by the first water pump 46 in the heat exchange unit of the first dehumidifier 43, condenses the moisture in the air, and the generated condensed water enters the first condensation water tank 48, and the cooled and dehumidified air enters the first heat exchanger 44 and exchanges heat with the flue gas coming out of the waste heat boiler 1, and the heated air is sent to the first hot blast furnace 2 through a pipeline to further increase the temperature and then sent to the blast furnace, at this time, the second dehumidification unit 5 is suspended.

[0044] When the second hot blast furnace 3 is in the air supply state, the first hot blast furnace 2 is in the furnace burning state, and the compressed air from the blower is heat exchanged with the blast furnace gas flowing through the second preheater 52 in the second preheater 52, and the heated blast furnace gas enters the first hot blast furnace 2 through a pipeline for combustion, and the cooled compressed air enters the second dehumidifier 53, and is heat exchanged with the normal temperature water delivered by the second water pump 56 in the heat exchange unit of the second dehumidifier 53, and the moisture in the air is condensed, and the generated condensed water enters the second condensate water tank 58, and the cooled and dehumidified air enters the second heat exchanger 54 and is heat exchanged with the flue gas coming out of the waste heat boiler 1, and the heated air is sent to the second hot blast furnace 3 through a pipeline to further increase the temperature and then sent to the blast furnace. At this time, the first dehumidification unit 4 is suspended.

[0045] The first hot blast stove 2 and the second hot blast stove 3 share a waste heat boiler 1, which can not only ensure the stability of the heat source of the waste heat boiler 1, but also ensure the provision of stable low-temperature flue gas.

[0046] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0047] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0048] It should be noted that, unless otherwise specified, all components involved in this embodiment are components that can be purchased in the prior art.

Claims

1. An energy-saving blast furnace blast dehumidification system, comprising a waste heat boiler (1), characterized in that: It also includes a first hot air furnace (2), a second hot air furnace (3), a first dehumidification unit (4) and a second dehumidification unit (5); The first dehumidification unit (4) comprises a first blower (41), a first preheater (42), a first dehumidifier (43) and a first heat exchanger (44) which are sequentially connected; the second dehumidification unit (5) comprises a second blower (51), a second preheater (52), a second dehumidifier (53) and a second heat exchanger (54) which are sequentially connected; The blast furnace gas outlet of the first preheater (42) is connected to the air inlet of the second hot blast furnace (3); the blast furnace gas outlet of the second preheater (52) is connected to the air inlet of the first hot blast furnace (2); The air outlet of the first heat exchanger (44) is connected to the air inlet of the first hot blast furnace (2); the air outlet of the second heat exchanger (54) is connected to the air inlet of the second hot blast furnace (3); the smoke inlet of the first heat exchanger (44) and the smoke inlet of the second heat exchanger (54) are respectively connected to the smoke outlet of the waste heat boiler (1).

2. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The water inlet of the first dehumidifier (43) is connected to the first water pump (46) via a first water supply pipeline (45); the water inlet of the second dehumidifier (53) is connected to the second water pump (56) via a second water supply pipeline (55).

3. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The drain outlet of the first dehumidifier (43) is connected to the first condensation water tank (48) via a first condensation water pipe (47); the drain outlet of the second dehumidifier (53) is connected to the second condensation water tank (58) via a second condensation water pipe (57).

4. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The blast furnace gas inlet of the first preheater (42) is connected to a first blast furnace gas pipeline (49), and the blast furnace gas inlet of the second preheater (52) is connected to a second blast furnace gas pipeline (59).

5. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The smoke outlet of the first heat exchanger (44) is also connected to a first discharge pipe; the smoke outlet of the second heat exchanger (54) is also connected to a second discharge pipe.

6. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The air outlet of the first heat exchanger (44) is in communication with the air inlet of the first hot air furnace (2), and the air outlet of the second heat exchanger (54) is in communication with the air inlet of the second hot air furnace (3).

7. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The hot gas outlet of the first hot blast furnace (2) and the hot gas outlet of the second hot blast furnace (3) are both connected to the air inlet of the blast furnace.

8. The energy-saving blast furnace dehumidification system according to claim 1, characterized in that: The high-temperature flue gas outlet of the first hot blast furnace (2) and the high-temperature flue gas outlet of the second hot blast furnace (3) are both in communication with the waste heat boiler (1).

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