CN115342648A - Blast furnace slag flushing water and gas generator set flue gas waste heat comprehensive utilization system - Google Patents
Blast furnace slag flushing water and gas generator set flue gas waste heat comprehensive utilization system Download PDFInfo
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- CN115342648A CN115342648A CN202210974053.8A CN202210974053A CN115342648A CN 115342648 A CN115342648 A CN 115342648A CN 202210974053 A CN202210974053 A CN 202210974053A CN 115342648 A CN115342648 A CN 115342648A
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- water
- condensed water
- slag flushing
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
- F22D1/18—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and heated indirectly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The application discloses blast furnace slag flushing water and gas generating set flue gas waste heat comprehensive utilization system. The system comprises condensed water, a slag flushing water-condensed water heat exchanger, a slag flushing water circulating water pool, a low-temperature economizer, a low-pressure heater, a dust remover, an induced draft fan, a gate valve, a condensed water booster pump, a check valve, an electric gate valve and a slag flushing water booster pump. The main condensed water path passes through low-pressure heaters at all stages, the other path passes through a slag flushing water-condensed water heat exchanger and a low-temperature economizer to reach the low-pressure heaters, and the slag flushing water-condensed water heat exchanger is connected with a slag flushing water circulating water tank through a pipeline; the dust remover, the low-temperature economizer and the induced draft fan are connected through pipelines. According to the temperature of the slag flushing water and the flue gas, the condensed water of the coal gas generator set is heated in a grading manner, the purpose of waste heat recovery is achieved, and the technical effects of energy conservation and environmental protection are facilitated.
Description
Technical Field
The application relates to the technical field of coal gas power generation, in particular to a comprehensive utilization system for blast furnace slag flushing water and flue gas waste heat of a coal gas generator set.
Background
The blast furnace can generate high-temperature slag at about 1500 ℃ in the iron-making process, the slag treatment process is mainly a water quenching slag process mode, so a large amount of slag flushing water can be generated, and the heat taken away by the slag flushing water accounts for about 8 percent of the iron-making energy consumption, which is about equivalent to 21kg of standard coal/ton of iron. China is a large household of steel production capacity, and the heat taken away by slag flushing water is about 1000 ten thousand tons of standard coal according to the annual output of 5 hundred million tons. The temperature of the circulating water tank for flushing the slag is about 80 ℃, the circulating water tank belongs to a low-temperature waste heat source, the utilization way is limited, most of the heat source is wasted, and more waste heat utilization ways are urgently needed to be opened up.
Meanwhile, a large amount of blast furnace gas is generated in the process of smelting iron and steel, at present, most iron and steel plants use abundant blast furnace gas for power generation by constructing a clean energy power generation project, and the energy is fully utilized; however, in most blast furnace gas boilers, the temperature of the discharged smoke is over 140 ℃, and compared with a large coal-fired unit, the temperature of the discharged smoke is still higher, and the waste heat of the part of the smoke still has a space for further recycling. Therefore, the comprehensive utilization system of the blast furnace slag flushing water and the flue gas waste heat of the gas generator set becomes one of the technical keys in the field.
Disclosure of Invention
In view of this, this application provides blast furnace slag flushing water and coal gas generating set flue gas waste heat comprehensive utilization system, can improve the unit generating heat efficiency, reaches waste heat recovery's purpose.
The application provides a comprehensive utilization system of blast furnace slag flushing water and flue gas waste heat of a gas generator set, which comprises a slag flushing water-condensed water heat exchanger, an economizer, a first heater, a second heater and a boosting pipeline assembly;
the water inlet of the second heater is used for introducing condensed water, and the water outlet of the second heater is communicated with the water inlet of the first heater to form a main path of the condensed water;
the slag flushing water-condensed water heat exchanger is provided with two water inlets for introducing slag flushing water and condensed water respectively, and a water outlet of the slag flushing water-condensed water heat exchanger is communicated with a water inlet of the boosting pipeline assembly;
a water outlet of the pressure boosting pipeline assembly is communicated with a water inlet of the second heater to form a first branch of condensed water;
a water outlet of the boosting pipeline assembly is communicated with a water inlet of the first heater through the economizer to form a second condensed water branch, and a gas inlet of the economizer is used for introducing flue gas; the second branch of condensed water is configured to be switched off when the temperature of the flue gas is low and configured to be switched on when the temperature of the flue gas is high.
Optionally, the main condensed water path further includes a fourth heater and a third heater sequentially connected in the flow direction of the condensed water to be heated.
Optionally, the boosting pipeline assembly comprises a boosting pipeline with a water inlet communicated with the slag flushing water-condensed water heat exchanger and a water outlet communicated with the second heater, and the boosting pipeline sequentially comprises a gate valve a, a condensed water booster pump a, a check valve a and an electric gate valve a according to the flowing direction of the condensed water to be heated.
Optionally, the boosting pipeline assembly comprises a standby boosting pipeline with a water inlet communicated with the slag flushing water-condensed water heat exchanger and a water outlet communicated with the second heater, and the standby boosting pipeline sequentially comprises a gate valve b, a condensed water booster pump b, a check valve b and an electric gate valve b according to the flowing direction of the condensed water to be heated.
Optionally, a water inlet of the slag flushing water-condensed water heat exchanger for introducing the slag flushing water is communicated with a slag flushing water inlet pipeline, and the slag flushing water inlet pipeline is sequentially communicated with a gate valve c, a slag flushing water booster pump a, a check valve c and an electric gate valve c in the flowing direction of the slag flushing water-condensed water heat exchanger.
Optionally, a water inlet of the slag flushing water-condensed water heat exchanger for introducing the slag flushing water is communicated with a standby slag flushing water supply pipeline, and the standby slag flushing water supply pipeline is sequentially communicated with a gate valve d, a slag flushing water booster pump b, a check valve d and an electric gate valve d according to a flow direction pointing to the slag flushing water-condensed water heat exchanger.
Optionally, the air inlet of the economizer is communicated with a dust remover.
Optionally, an air outlet of the economizer is communicated with an induced draft fan.
The comprehensive utilization system of the blast furnace slag flushing water and the flue gas waste heat of the gas generator set heats the condensed water of the gas generator set in a grading way according to the temperatures of the slag flushing water and the flue gas, part of the condensed water is heated from the initial temperature of 41 ℃ for example to the first temperature of 70 ℃ for example through the slag flushing water, the condensed water is heated from the first temperature to the preset temperature of 128 ℃ for example through the flue gas waste heat, the heat is utilized into the gas generator set through the condensed water, the generating heat efficiency of the unit is improved, the purpose of waste heat recycling is achieved, and the comprehensive utilization system has important guiding significance for steel enterprises to respond to 'double-carbon policies' and environmental protection.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a comprehensive utilization system of blast furnace slag flushing water and gas generator set flue gas waste heat provided by an embodiment of the application.
Wherein the elements in the figures are identified as follows:
1-condensation of water; 2-slag flushing water-condensed water heat exchanger; 3-a slag flushing water circulating water tank;
4-a coal economizer; 5-a first heater; 6-a second heater; 7-third heater; 8-a fourth heater; 9-a dust remover; 10-a draught fan;
21-gate valve a; 22-condensate booster pump a; 23-check valve a; 24-electric gate valve a;
25-gate valve b; 26-condensate booster pump b; 27-check valve b; 28-electric gate valve b;
31-gate valve c; 32-slag flushing water booster pump a; 33-check valve c; 34-electric gate valve c;
35-gate valve d; 36-slag flushing water booster pump b; 37-check valve d; 38-electric gate valve d; 41-electric gate valve e; 42-electric gate valve f; 61-electric gate valve g.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The following disclosure provides many different embodiments or examples for implementing different features of the application. To simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The utility model provides a blast furnace sluicing water and gas generating set flue gas waste heat comprehensive utilization system, including condensate 1, sluicing water-condensate heat exchanger 2, sluicing water circulation pond 3, economizer 4, primary heater 5, secondary heater 6, tertiary heater 7, fourth heater 8, dust remover 9, draught fan 10, gate valve a21, condensate booster pump a22, check valve a23, electronic gate valve a24, gate valve b25, condensate booster pump b26, check valve b27, electronic gate valve b28, gate valve c31, sluicing water booster pump a32, check valve c33, electronic gate valve c34, gate valve d35, sluicing water booster pump b36, check valve d37, electronic gate valve d38, electronic gate valve e41, electronic gate valve f42 and electronic gate valve g61.
As shown in fig. 1, the condensate 1, the fourth heater 8, the third heater 7, the second heater 6 and the first heater 5 are connected in sequence by pipes to form a condensate main path, and in the gas turbine generator set, this portion is used to heat the condensate 1, and most of the condensate 1 passes through this condensate main path.
As shown in fig. 1, a portion (temperature of about 41 ℃) extracted from the condensate 1 enters the slag washing water-condensate heat exchanger 2 to be heated, and the heated condensate (temperature of about 70 ℃) passes through a gate valve a21, a condensate booster pump a22, a check valve a23, and an electric gate valve a24 in this order to complete the boosting. The pipeline composed of the gate valve a21, the condensate booster pump a22, the check valve a23 and the electric gate valve a24 is a condensate standby boosting pipeline, and when the condensate booster pump a22 fails, the boosting operation of the condensate can be completed through the pipeline. The condensed water after the pressure increase may be sent to the second heater 6 via the electric gate valve g61 to be mixed with the main path (temperature of about 97 ℃) of the condensed water, which is the first branch path of the condensed water, or may be sent to the first heater 5 via the electric gate valve e41, the economizer 4, and the electric gate valve f42, which is the second branch path of the condensed water. When the temperature of the flue gas in the economizer 4 is high enough to heat the condensed water, the second branch of the condensed water is opened, the first branch of the condensed water is closed, and the condensed water is heated by the economizer 4 (the temperature is about 128 ℃) and then goes to the first heater 5 with higher heating temperature to be mixed with the main path of the condensed water (the temperature is about 123 ℃); when the temperature of the flue gas in the economizer 4 is lower and the condition of heating the condensed water is not met, the first branch of the condensed water is opened, the second branch of the condensed water is closed, and the condensed water goes to the second heater 6 with a lower heating temperature.
As shown in fig. 1, the dust remover 9, the economizer 4 and the induced draft fan 10 are connected in sequence through a pipeline to form a flue gas heat exchange pipeline, and when the temperature of flue gas entering the economizer 4 is high, the flue gas can be used for heating condensed water in a second branch of the condensed water; when the temperature of the flue gas is lower after entering the economizer 4, the second branch of condensed water is not needed to be added for avoiding low-temperature corrosion.
As shown in fig. 1, a slag flushing water circulating water tank 3, a gate valve c31, a slag flushing water booster pump a32, a check valve c33, an electric gate valve c34 and a slag flushing water-condensed water heat exchanger 2 are connected in sequence through pipelines to form a slag flushing water upper water pipeline, and slag flushing water (with the temperature of about 80 ℃) is sent to the slag flushing water-condensed water heat exchanger 2 to heat condensed water; the gate valve d35, the slag flushing water booster pump b36, the check valve d37 and the electric gate valve d38 are sequentially connected through pipelines to form a slag flushing water standby water supply pipeline, the slag flushing water supply pipeline and the slag flushing water standby water supply pipeline are connected in parallel, and when the slag flushing water booster pump b36 breaks down, the slag flushing water standby water supply pipeline can be put into use. The slag flushing water-condensed water heat exchanger 2 and the slag flushing water circulating water tank 3 are directly connected through a pipeline to form a slag flushing water return pipeline which is used for recovering the slag flushing water (with the temperature of about 50 ℃) with low temperature after the condensed water is heated, and the cooled slag flushing water is continuously used for cooling the slag.
In the gas generator set, the condensed water in the fourth heater 8, the third heater 7, the second heater 6 and the first heater 5 is heated by extracting the high-temperature high-pressure steam of each stage of the steam turbine, so that high-quality energy waste can be caused. In addition, the system also fully utilizes the waste heat of the slag flushing water and the flue gas, and reduces the heat loss.
To sum up, according to the temperature of the slag flushing water and the flue gas, the condensed water of the gas generator set is heated in a grading manner, part of the condensed water is heated to 70 ℃ from 41 ℃ through the slag flushing water, then the condensed water is heated to 128 ℃ from 70 ℃ through the flue gas waste heat, the heat is utilized to the gas generator set through the condensed water, the generating heat efficiency of the set is improved, the purpose of waste heat recycling is achieved, and the method has important guiding significance for responding to a 'double-carbon policy' and protecting the environment of a steel enterprise.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application.
Claims (8)
1. A comprehensive utilization system for blast furnace slag washing water and flue gas waste heat of a gas generator set is characterized by comprising a slag washing water-condensed water heat exchanger (2), an economizer (4), a first heater (5), a second heater (6) and a boosting pipeline assembly;
the water inlet of the second heater (6) is used for introducing condensed water, and the water outlet of the second heater (6) is communicated with the water inlet of the first heater (5) to form a main path of the condensed water;
the slag flushing water-condensed water heat exchanger (2) is provided with two water inlets for introducing slag flushing water and condensed water respectively, and a water outlet of the slag flushing water-condensed water heat exchanger (2) is communicated with a water inlet of the boosting pipeline assembly;
the water outlet of the boosting pipeline assembly is communicated with the water inlet of the second heater (6) to form a first branch of condensed water;
a water outlet of the boosting pipeline assembly passes through the economizer (4) and is communicated with a water inlet of the first heater (5) to form a second condensed water branch, and a gas inlet of the economizer (4) is used for introducing flue gas; the second branch of condensed water is configured to be switched off when the temperature of the flue gas is low and configured to be switched on when the temperature of the flue gas is high.
2. The comprehensive utilization system of blast furnace slag flushing water and gas generator set flue gas waste heat according to claim 1, wherein the main condensed water path further comprises a fourth heater (8) and a third heater (7) which are sequentially communicated with each other according to the flowing direction of the condensed water in which the condensed water is heated.
3. The comprehensive utilization system of blast furnace slag flushing water and gas generator set flue gas waste heat according to claim 1, wherein the boosting pipeline assembly comprises a boosting pipeline with a water inlet communicated with the slag flushing water-condensed water heat exchanger (2) and a water outlet communicated with the second heater (6), and the boosting pipeline sequentially comprises a gate valve a (21), a condensed water booster pump a (22), a check valve a (23) and an electric gate valve a (24) according to the flowing direction of the condensed water to be heated.
4. The comprehensive utilization system of blast furnace slag flushing water and gas generator set flue gas waste heat according to claim 1, wherein the pressure boosting pipeline assembly comprises a standby pressure boosting pipeline with a water inlet communicated with the slag flushing water-condensed water heat exchanger (2) and a water outlet communicated with the second heater (6), and the standby pressure boosting pipeline sequentially comprises a gate valve b (25), a condensed water booster pump b (26), a check valve b (27) and an electric gate valve b (28) according to the flow direction of the condensed water to be heated.
5. The comprehensive utilization system of the blast furnace slag washing water and the flue gas waste heat of the gas generator set according to claim 1, wherein a water inlet of the slag washing water-condensed water heat exchanger (2) for introducing the slag washing water is communicated with a slag washing water inlet pipeline, and the slag washing water inlet pipeline is sequentially communicated with a gate valve c (31), a slag washing water booster pump a (32), a check valve c (33) and an electric gate valve c (34) in the flowing direction of the slag washing water-condensed water heat exchanger (2).
6. The comprehensive utilization system of blast furnace slag washing water and gas generator set flue gas waste heat according to claim 1 is characterized in that a water inlet of the slag washing water-condensed water heat exchanger (2) for introducing slag washing water is communicated with a slag washing water standby water supply pipeline, and the slag washing water standby water supply pipeline is sequentially communicated with a gate valve d (35), a slag washing water booster pump b (36), a check valve d (37) and an electric gate valve d (38) according to the flow direction pointing to the slag washing water-condensed water heat exchanger (2).
7. The comprehensive utilization system of blast furnace slag flushing water and gas generator set flue gas waste heat according to claim 1, characterized in that an air inlet of the economizer (4) is communicated with a dust remover (9).
8. The comprehensive utilization system of blast furnace slag flushing water and gas generator set flue gas waste heat according to claim 1, characterized in that an air outlet of the economizer (4) is communicated with an induced draft fan (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210974053.8A CN115342648A (en) | 2022-08-15 | 2022-08-15 | Blast furnace slag flushing water and gas generator set flue gas waste heat comprehensive utilization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210974053.8A CN115342648A (en) | 2022-08-15 | 2022-08-15 | Blast furnace slag flushing water and gas generator set flue gas waste heat comprehensive utilization system |
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| CN115342648A true CN115342648A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210974053.8A Pending CN115342648A (en) | 2022-08-15 | 2022-08-15 | Blast furnace slag flushing water and gas generator set flue gas waste heat comprehensive utilization system |
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| CN (1) | CN115342648A (en) |
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- 2022-08-15 CN CN202210974053.8A patent/CN115342648A/en active Pending
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