CN111238248A - Converter steam waste heat utilization system additionally provided with self-superheater - Google Patents
Converter steam waste heat utilization system additionally provided with self-superheater Download PDFInfo
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- CN111238248A CN111238248A CN202010200945.3A CN202010200945A CN111238248A CN 111238248 A CN111238248 A CN 111238248A CN 202010200945 A CN202010200945 A CN 202010200945A CN 111238248 A CN111238248 A CN 111238248A
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- steam
- converter
- superheater
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- heat
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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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/06—Energy from waste gas used in other processes
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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
- F27D2017/007—Systems for reclaiming waste heat including regenerators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a converter steam waste heat utilization system additionally provided with a self-superheater, which comprises a converter, the self-superheater, a steam heat accumulator, a steam turbine and a generator, wherein the generator is connected with the steam turbine, the steam turbine is connected with a condenser, and the condenser is connected with a cooling tower; a converter steam pocket is arranged on the converter, the converter steam pocket is connected with a heat source inlet end on a self-superheater, a heat source outlet end on the self-superheater is connected with a steam inlet of a steam heat accumulator, a steam outlet of the steam heat accumulator is connected with a cold source inlet end of the self-superheater, and a cold source outlet end of the self-superheater is connected with a steam turbine; the turbine is connected to a condenser for cooling the turbine exhaust. The invention is additionally provided with the self-superheater to exchange heat between the steam at the high-temperature section of the converter and the low-pressure saturated steam, thereby being beneficial to weakening the fluctuation of the steam of the converter, improving the generating efficiency of the steam turbine set, reducing the cavitation of the set and improving the utilization rate of the waste heat steam.
Description
Technical Field
The invention relates to the technical field of energy conservation and emission reduction of converter steel plants, in particular to a converter steam waste heat utilization system additionally provided with a self-superheater.
Background
As an energy and resource intensive industry, the steel industry consumes about 16 percent of the total energy consumption in China, and the energy consumption per ton of steel is 20 percent higher than that of developed countries. Therefore, the method has important significance for greatly promoting the development of energy-saving and emission-reducing technology in the steel industry. According to the development trend of electric furnace steelmaking in China, the yield of converter steel and electric furnace steel in China in 2017 is 73798 ten thousand tons and 7749 ten thousand tons respectively. In view of the current situations of insufficient steel scrap resources and higher electricity prices in China, converter steelmaking still occupies the first main steelmaking method in China for a long time in the future. In the process of converter steelmaking, when the generated high-temperature coal gas passes through a furnace cap and an inclined flue, the high-temperature coal gas needs to be cooled, the temperature reduction adopts a vaporization cooling technology, the water in a discharge pipe is cooled to vaporize the coal gas into low-pressure steam, and the steam can be recovered by a steam pocket to generate electricity. However, because converter steam is low-pressure saturated steam, the converter steam has high humidity and is easy to condense, the problems of low power generation efficiency, serious cavitation of the steam turbine unit, easy damage of equipment, high manufacturing cost, poor economic benefit and the like exist when the existing saturated steam turbine unit is used for generating power, and waste heat steam cannot be effectively recycled. The temperature and the pressure of the converter steam can change along with the periodic change of the flow and the temperature of the converter steelmaking flue gas, and if the converter steam is directly merged into a steam pipe network, the converter steam can impact the steam pipe network and a steam turbine set. Therefore, the search of effective technical approaches for heating converter steam into micro superheated steam and solving the problem of converter steam fluctuation becomes a major topic in the field of environmental protection and energy conservation of metallurgical processes.
The existing converter steam waste heat utilization system is provided with a steam heat accumulator between a converter steam drum and a steam turbine unit, the steam heat accumulator solves the problem of converter steam fluctuation, but waste heat steam output by the steam heat accumulator is low-pressure saturated steam, the low-pressure saturated steam only remains 90% of the low-pressure saturated steam to perform waste heat power generation before entering a steam turbine through a steam-water separator, and the problems of low power generation efficiency, serious unit cavitation and the like still exist when the steam source is utilized to generate power.
Therefore, a converter steam waste heat utilization system additionally installed on a self-superheater is required to be developed.
Disclosure of Invention
The invention aims to provide a converter steam waste heat utilization system additionally provided with a self-superheater, which is beneficial to weakening the fluctuation of converter steam, improving the power generation efficiency of a steam turbine set, reducing the cavitation of the set and improving the utilization rate of waste heat steam by additionally arranging the self-superheater to carry out heat exchange on the steam at the high-temperature section of a converter and low-pressure saturated steam.
In order to achieve the aim, the invention provides a converter steam waste heat utilization system additionally provided with a self-superheater, which comprises a converter, the self-superheater, a steam heat accumulator, a steam turbine and a generator, wherein the generator is connected with the steam turbine, the steam turbine is connected with a condenser, and the condenser is connected with a cooling tower;
a converter steam pocket is arranged on the converter, the converter steam pocket is connected with a heat source inlet end on the self-superheater, a heat source outlet end on the self-superheater is connected with a steam inlet of the steam heat accumulator, a steam outlet of the steam heat accumulator is connected with a cold source inlet end of the self-superheater, and a cold source outlet end of the self-superheater is connected with the steam turbine;
the steam turbine is connected with the condenser used for cooling steam discharged by the steam turbine, and condensed water in the condenser is pressurized by a converter water feeding pump and is pumped into the converter to exchange heat with converter flue gas.
Preferably, the self-superheater comprises a sealing shell, steam collecting boxes arranged at two ends of the sealing shell, a heat conducting plate, a hot flow pipe and a cold flow pipe, wherein the cold flow pipe and the hot flow pipe are connected with the heat conducting plate, and two ends of the hot flow pipe and two ends of the cold flow pipe are connected with the corresponding steam collecting boxes;
the steam collecting boxes at one end are arranged into an upper steam collecting box and a lower steam collecting box, the steam collecting box at the upper part is provided with a heat source inlet, the heat source inlet is connected with the converter steam drum, the steam collecting box at the lower part is provided with a cold source outlet, and the cold source outlet is connected with the steam turbine;
the steam collecting box at the other end is divided into an upper part and a lower part, the steam collecting box at the upper part is provided with a heat source outlet, the heat source outlet is connected with a steam inlet of the steam heat accumulator, the steam collecting box at the lower part is provided with a cold source inlet, and the cold source inlet is connected with a steam outlet of the steam heat accumulator.
Preferably, the hot flow pipe and the cold flow pipe are arranged in a plurality of numbers, the cold flow pipe is arranged below the hot flow pipe, and the hot flow pipe and the cold flow pipe penetrate through the sealing shell.
Preferably, a heat storage material is packaged in the sealing shell, and the heat storage material is molten salt.
Preferably, a saturated steam regulating valve, a drain valve, a water replenishing valve and a drain valve are arranged on a connecting pipeline of the steam heat accumulator.
Therefore, the converter steam waste heat utilization system provided with the self-superheater, which adopts the structure, has the following beneficial effects:
(1) the self-superheater fully utilizes the waste heat of the converter steam, and the fluctuation of the converter steam is weakened;
(2) the self-superheater can increase the temperature of low-pressure saturated steam by 10-20 ℃, and can heat the low-pressure saturated steam into micro superheated steam, thereby improving the grade of waste heat steam, improving the power generation efficiency of a steam turbine, and simultaneously reducing the cavitation of a unit;
(3) the self-superheater adopts fused salt as a heat storage material, so that stable output of micro-superheated steam can be maintained, and the heat conducting plates are welded on the cold flow pipe and the hot flow pipe, so that the heat exchange efficiency of cold and hot flows is improved;
(4) the self-superheater has the advantages of simple structure, small occupied area and the like, and promotes the energy-saving development of metallurgical industry.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of the operation of an embodiment of a system for utilizing the residual heat of converter steam additionally provided with a self-superheater according to the present invention;
FIG. 2 is a schematic structural diagram of a self-superheater of an embodiment of a converter steam waste heat utilization system additionally provided with the self-superheater;
fig. 3 is a schematic diagram of an internal structure of a self-superheater of an embodiment of a converter steam waste heat utilization system additionally provided with the self-superheater.
Detailed Description
Examples
Fig. 1 is a work flow diagram of an embodiment of a converter steam waste heat utilization system provided with a self-superheater, fig. 2 is a schematic structural diagram of the self-superheater of the embodiment of the converter steam waste heat utilization system provided with the self-superheater, and fig. 3 is a schematic structural diagram of the internal structure of the self-superheater of the embodiment of the converter steam waste heat utilization system provided with the self-superheater. As shown in the figure, the invention provides a converter steam waste heat utilization system additionally provided with a self-superheater, which comprises a converter 1, a self-superheater 2, a steam heat accumulator 3, a steam turbine 4 and a generator 5, wherein the generator 5 is connected with the steam turbine 4, the steam turbine 4 is connected with a condenser 6, and the condenser 6 is connected with a cooling tower 7; a converter steam pocket 8 is arranged on the converter 1, the converter steam pocket 8 is connected with a heat source inlet end on the self-superheater 2, a heat source outlet end on the self-superheater 2 is connected with a steam inlet of the steam heat accumulator 3, a steam outlet of the steam heat accumulator 3 is connected with a cold source inlet end of the self-superheater 2, and a cold source outlet end of the self-superheater 2 is connected with the steam turbine 4; the steam turbine 4 is connected with a condenser 6 for cooling steam discharged by the steam turbine, and condensed water in the condenser 6 is pressurized by a converter feed pump 9 and is pumped into the converter 1 to exchange heat with converter flue gas. According to the invention, the self-superheater is arranged among the steam heat accumulator, the converter and the steam turbine, the characteristic that converter steam has fluctuation is utilized, high-temperature-section steam output by the converter and low-pressure saturated steam output by the steam heat accumulator are respectively fed into the self-superheater, the high-temperature-section steam of the converter is utilized to heat the low-pressure saturated steam into micro-superheated steam, and the micro-superheated steam is fed into the steam turbine unit to carry out waste heat power generation. The self-superheater has the advantages of high heat exchange efficiency, small occupied area and the like, and can exchange heat between high-temperature section steam and low-pressure saturated steam of the converter, so that the fluctuation of the converter steam can be weakened.
The self-superheater 2 comprises a sealing shell 20, steam collecting boxes 21 arranged at two ends of the sealing shell 20, a heat conducting plate 22, a hot flow pipe 23 and a cold flow pipe 24, wherein the cold flow pipe 24 and the hot flow pipe 23 are connected with the heat conducting plate 21, and two ends of the hot flow pipe 23 and two ends of the cold flow pipe 24 are connected with the corresponding steam collecting boxes 21; the steam collecting boxes 21 at one end are arranged into an upper steam collecting box and a lower steam collecting box, the steam collecting box 21 at the upper part is provided with a heat source inlet 25, the heat source inlet 25 is connected with the converter steam drum 8, the steam collecting box 21 at the lower part is provided with a cold source outlet 26, and the cold source outlet 26 is connected with the steam turbine 4; the steam collection boxes 21 at the other end are arranged into an upper steam collection box and a lower steam collection box, the steam collection box 21 at the upper part is provided with a heat source outlet 27, the heat source outlet 27 is connected with a steam inlet of the steam heat accumulator 3, the steam collection box 21 at the lower part is provided with a cold source inlet 28, and the cold source inlet 28 is connected with a steam outlet of the steam heat accumulator 3. The hot flow pipe 23 and the cold flow pipe 24 are provided in plurality, three in the present embodiment, and the cold flow pipe 24 is provided below the hot flow pipe 23, and both the hot flow pipe 23 and the cold flow pipe 24 penetrate the sealing case 20. The sealed shell 20 is internally sealed with a heat storage material, and the heat storage material is molten salt. The connecting pipeline of the steam heat accumulator 3 is provided with a saturated steam regulating valve 31, a drain valve 32, a water replenishing valve 33 and a drain valve 34. High temperature section steam flows into the heat flow pipe after flowing out from the steam collection box outlet and exchanges heat with fused salt, the heat flow pipe is welded with a heat conducting plate, the high temperature section steam can conduct heat to low-pressure saturated steam through the heat flow pipe, the heat conducting plate and the cold flow pipe, the high temperature section steam enters the steam collection box through the heat flow pipe after releasing heat and is collected, the high temperature section steam flows out from the steam collection box and flows into the steam heat accumulator through the heat source outlet of the self-superheater. The steam heat accumulator continuously inputs low-pressure saturated steam to a cold source inlet of the self-superheater, the low-pressure saturated steam flows in from the cold source inlet of the self-superheater and enters a steam collecting box, the steam collecting box is connected with three cold flow pipes, the cold flow pipes penetrate through a sealing shell, the low-pressure saturated steam flows out from an outlet of the steam collecting box and then flows into the cold flow pipes to exchange heat with molten salt, a heat conducting plate is welded outside the cold flow pipes, the low-pressure saturated steam can exchange heat with high-temperature steam of the converter through the cold flow pipes, the heat conducting plate and the hot flow pipes, the low-pressure saturated steam absorbs heat to form micro superheated steam, the micro superheated steam enters the steam collecting box through the cold flow pipes to be collected, the micro superheated steam flows out of the steam collecting box and.
The specific working principle is as follows: converter steam flows out of a converter steam pocket and then enters a heat source inlet of a self-superheater, heat is released in the self-superheater, the converter steam flows out of a heat source outlet of the self-superheater and then enters a steam heat accumulator, the steam heat accumulator can store saturated steam conveyed from the superheater and changes the temperature and the pressure of the steam at the outlet of the steam heat accumulator by adjusting a pressure regulating valve, the steam heat accumulator continuously conveys stable low-pressure saturated steam into a cold source inlet of the self-superheater, the low-pressure saturated steam absorbs heat in the self-superheater and is heated into micro superheated steam, the micro superheated steam flows out of the cold source outlet of the self-superheater and then enters a steam turbine, the micro superheated steam converts heat into mechanical energy in the steam turbine and drives a generator to generate electricity, the micro superheated steam does work in the steam turbine and then enters a condenser to be cooled into condensed water by circulating water from a cooling tower, the condensed water is pressurized by a converter feed pump and is pumped into a converter cooling system to exchange heat with converter flue gas, and converter steam is generated.
Therefore, the converter steam waste heat utilization system additionally provided with the self-superheater adopts the structure, and the self-superheater is additionally arranged to exchange heat between the high-temperature section steam of the converter and the low-pressure saturated steam, so that the fluctuation of the converter steam is weakened, the power generation efficiency of the steam turbine set is improved, the cavitation of the set is reduced, and the utilization rate of the waste heat steam is improved.
The above-mentioned self-superheater is a straight-tube self-superheater, the self-superheater can also be a coil self-superheater, a plate self-superheater, etc., and all devices related to the converter steam self-superheating technology are within the protection scope of the claims, and the above-mentioned embodiments are only described for the preferred mode of the present invention, and do not limit the scope of the present invention, and on the premise of not departing from the design spirit of the present invention, various modifications and improvements made to the technical solution of the present invention by those skilled in the art should fall within the protection scope determined by the claims of the present invention.
Claims (5)
1. The utility model provides a converter steam waste heat utilization system who installs certainly superheater additional which characterized in that:
the system comprises a converter, a self-superheater, a steam heat accumulator, a steam turbine and a generator, wherein the generator is connected with the steam turbine, the steam turbine is connected with a condenser, and the condenser is connected with a cooling tower;
a converter steam pocket is arranged on the converter, the converter steam pocket is connected with a heat source inlet end on the self-superheater, a heat source outlet end on the self-superheater is connected with a steam inlet of the steam heat accumulator, a steam outlet of the steam heat accumulator is connected with a cold source inlet end of the self-superheater, and a cold source outlet end of the self-superheater is connected with the steam turbine;
the steam turbine is connected with the condenser used for cooling steam discharged by the steam turbine, and condensed water in the condenser is pressurized by a converter water feeding pump and is pumped into the converter to exchange heat with converter flue gas.
2. The system for utilizing the residual heat of the converter steam added with the self-superheater according to claim 1, is characterized in that:
the self-superheater comprises a sealing shell, steam collecting boxes arranged at two ends of the sealing shell, a heat conducting plate, a hot flow pipe and a cold flow pipe, wherein the cold flow pipe and the hot flow pipe are connected with the heat conducting plate, and two ends of the hot flow pipe and two ends of the cold flow pipe are connected with the corresponding steam collecting boxes;
the steam collecting boxes at one end are arranged into an upper steam collecting box and a lower steam collecting box, the steam collecting box at the upper part is provided with a heat source inlet, the heat source inlet is connected with the converter steam drum, the steam collecting box at the lower part is provided with a cold source outlet, and the cold source outlet is connected with the steam turbine;
the steam collecting box at the other end is divided into an upper part and a lower part, the steam collecting box at the upper part is provided with a heat source outlet, the heat source outlet is connected with a steam inlet of the steam heat accumulator, the steam collecting box at the lower part is provided with a cold source inlet, and the cold source inlet is connected with a steam outlet of the steam heat accumulator.
3. The converter steam waste heat utilization system additionally installed on a self-superheater according to claim 2, characterized in that: the hot flow pipe with cold flow pipe all sets up to a plurality ofly, just cold flow pipe sets up the below of hot flow pipe, just hot flow pipe with cold flow pipe all runs through sealed shell.
4. The converter steam waste heat utilization system additionally installed on a self-superheater according to claim 3, characterized in that: the sealed shell is internally packaged with a heat storage material, and the heat storage material is molten salt.
5. The converter steam waste heat utilization system additionally provided with a self-superheater according to claim 4, characterized in that: and a saturated steam regulating valve, a drain valve, a water replenishing valve and a drain valve are arranged on a connecting pipeline of the steam heat accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200945.3A CN111238248A (en) | 2020-03-20 | 2020-03-20 | Converter steam waste heat utilization system additionally provided with self-superheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200945.3A CN111238248A (en) | 2020-03-20 | 2020-03-20 | Converter steam waste heat utilization system additionally provided with self-superheater |
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| CN111238248A true CN111238248A (en) | 2020-06-05 |
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| CN202010200945.3A Pending CN111238248A (en) | 2020-03-20 | 2020-03-20 | Converter steam waste heat utilization system additionally provided with self-superheater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237349A (en) * | 2021-04-27 | 2021-08-10 | 北京中冶设备研究设计总院有限公司 | Converter steam waste heat utilization device |
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2020
- 2020-03-20 CN CN202010200945.3A patent/CN111238248A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237349A (en) * | 2021-04-27 | 2021-08-10 | 北京中冶设备研究设计总院有限公司 | Converter steam waste heat utilization device |
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