CN109210524B - Steam heat accumulation superheating system - Google Patents
Steam heat accumulation superheating system Download PDFInfo
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- CN109210524B CN109210524B CN201811205031.5A CN201811205031A CN109210524B CN 109210524 B CN109210524 B CN 109210524B CN 201811205031 A CN201811205031 A CN 201811205031A CN 109210524 B CN109210524 B CN 109210524B
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- Prior art keywords
- steam
- heat
- valve
- accumulator
- heat source
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- 238000009825 accumulation Methods 0.000 title claims description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 230000001502 supplementing effect Effects 0.000 claims abstract description 9
- 239000007791 liquid phase Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000005338 heat storage Methods 0.000 abstract description 22
- 239000002918 waste heat Substances 0.000 abstract description 12
- 238000003723 Smelting Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003546 flue gas Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/12—Steam superheating characterised by heating method by mixing steam with furnace gases or other combustion products
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a steam heat storage and superheating system which is applied to the field of smelting flue gas waste heat recovery and comprises a steam drum, a steam heat accumulator, a steam superheater and a control valve group; a heating tube bundle is arranged in the liquid phase space at the bottom of the steam heat accumulator; the control valve group comprises a heat source inlet valve, a heat source outlet valve and a discharge valve; the outlet of the steam superheater is divided into two paths, one path is connected with the heating tube bundle through a heat source inlet valve, and the other path is directly discharged through a discharge valve; the heating tube bundle outlet is discharged through a heat source outlet valve. The system realizes the effect of supplementing heat to the heat accumulator by using an external heat source through the heat accumulator heating tube bundle, improves the pressure in the heat accumulator in the heat release stage, and further can improve the pressure of steam sent out by the heat accumulator while realizing continuous and stable output of steam. Compared with a conventional steam heat storage superheating system, the heat storage capacity of the system is larger under the same heat storage volume, and the pressure of the stored steam can be further improved, so that the steam quality is improved.
Description
Technical Field
The invention belongs to the field of waste heat recovery of smelting flue gas, and particularly relates to a steam heat storage and overheating system.
Background
In the smelting process of the converter or the electric furnace, a large amount of high-temperature smoke is generated, and the heat contained in the high-temperature smoke also has periodic characteristics due to the periodic characteristics of smelting. At present, the waste heat is generally recovered by a waste heat boiler, saturated waste heat steam can be generated by the waste heat boiler, the steam yield of the waste heat steam has larger fluctuation along with the smelting process, for example, the instantaneous steam yield in the smelting period can reach hundreds of tons/hour, and the steam yield of a boiler in the non-smelting period is close to zero.
To balance such large steam load fluctuations, steam heat storage techniques are generally employed. And continuous and stable output of waste heat steam is realized through peak clipping and valley filling of the steam heat accumulator. When the steam generating load of the waste heat boiler is larger than the steam supplying load outside the heat accumulator, the heat accumulator enters a heat charging state, the steam fed by the waste heat boiler is condensed and stored in the heat accumulator, and the pressure in the heat accumulator is increased; when the steam load of the waste heat boiler is smaller than the steam load supplied outside the heat accumulator, the heat accumulator enters a heat release state, the pressure in the heat accumulator is reduced, and condensed water begins to evaporate so as to meet the steam demand.
The heat storage capacity of the heat accumulator has a direct relation with the pressure difference between the inlet and the outlet, and the larger the pressure difference is, the larger the heat storage capacity is, but the heat storage process is realized at the cost of sacrificing the quality of steam (namely reducing the pressure of the steam and the useful work). According to the principle of heat accumulation, the pressure of steam supplied outside the heat accumulator is not lower than the lowest pressure in the heat accumulator in the heat release stage. Therefore, if the minimum pressure in the heat release stage can be increased, the quality of the steam supplied from the heat accumulator can be improved.
Disclosure of Invention
In view of the above, the present invention aims to provide a steam heat storage and superheating system, which can realize continuous and stable superheated steam output through heat storage and superheating for periodic waste heat steam. Compared with a conventional steam heat storage superheating system, the heat storage capacity of the system is larger under the same heat storage volume, so that the pressure of the stored steam can be further improved, and the quality of the steam is improved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a steam heat accumulation and superheating system comprises a steam drum, a steam heat accumulator, a steam superheater and a control valve group; the steam drum, the steam heat accumulator and the steam superheater are connected in sequence; a heating tube bundle is arranged in the liquid phase space at the bottom of the steam heat accumulator; the steam superheater is connected with the heating tube bundle through a control valve group; the control valve group comprises a heat source inlet valve, a heat source outlet valve and a discharge valve; the outlet of the steam superheater is divided into two paths, one path is connected with the heating tube bundle through a heat source inlet valve, and the other path is directly discharged through a discharge valve; the heating tube bundle outlet is vented through a heat source outlet valve.
When the pressure in the steam heat accumulator is reduced to the set heat supplementing pressure, the heat source inlet valve and the heat source outlet valve are opened, and the discharge valve is closed; when the pressure in the steam heat accumulator is higher than the set heat supplementing pressure, the heat source inlet valve and the heat source outlet valve are closed, and the discharge valve is opened.
Preferably, the control valve group further comprises a water supplementing valve and a water draining valve which are connected with the steam heat accumulator.
The invention has the beneficial effects that: the system realizes the effect of supplementing heat to the heat accumulator by using an external heat source through the heat accumulator heating tube bundle, improves the pressure in the heat accumulator in the heat release stage, and further can improve the pressure of steam sent out by the heat accumulator while realizing continuous and stable output of steam. Compared with a conventional steam heat storage superheating system, the heat storage capacity of the system is larger under the same heat storage volume, and the pressure of the stored steam can be further improved, so that the steam quality is improved.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention provides the following drawings for description:
FIG. 1 is a schematic diagram of a system according to the present invention;
fig. 2 is a graph comparing the effect of the system of the present invention with that of a conventional steam heat storage system.
The figures are marked as follows: the steam drum 1, the steam inlet valve 11, the steam heat accumulator 2, the heating tube bundle 21, the heat source inlet valve 22, the heat source outlet valve 23, the water supplementing valve 24, the water draining valve 25, the steam superheater 3 and the drain valve 31.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a steam heat storage superheating system comprises a steam drum 1, a steam heat accumulator 2, a steam superheater 3 and a control valve group; the steam drum 1, the steam heat accumulator 2 and the steam superheater 3 are connected in sequence; a heating tube bundle 21 is arranged in the liquid phase space at the bottom of the steam heat accumulator 2; the steam superheater 3 is connected with the heating pipe 21 bundle through a control valve group; the control valve block comprises a heat source inlet valve 22, a heat source outlet valve 23 and a discharge valve 31; the outlet of the steam superheater 3 is divided into two paths, one path is connected with the heating tube bundle 21 through a heat source inlet valve 22, and the other path is directly discharged through a discharge valve 31; the heating tube bundle 21 outlet is discharged through a heat source outlet valve 23.
Further, the control valve set adopted in this embodiment further includes a water replenishing valve 24 and a water draining valve 25 connected to the steam heat accumulator 2, and is correspondingly equipped with a water replenishing and draining pipeline.
Steam from the boiler drum 1 is sent into the steam heat accumulator 2 through the steam inlet valve 11, the steam inlet and the steam outlet of the steam heat accumulator 2 are respectively provided with check valves, and a bypass pipeline and a valve are further arranged between the steam heat accumulator 3 and the main steam pipe. The outlet of the steam heat accumulator 2 is connected with the steam superheater 3, and the heat source used in the steam superheater 3 can be high-temperature flue gas, high-temperature steam, high-temperature fused salt, high-temperature heat conducting oil and the like. The heat source heats the steam in the steam superheater 3 to superheat the steam, thereby improving the steam quality. The heat source after heat exchange can be discharged through the discharge valve 31 or fed into the heating tube bundle 21 in the steam accumulator 2 through the heat source inlet valve 22 of the steam accumulator 2 for further heat exchange. The heating tube bundle 21 serves to heat the condensed water in the steam regenerator 2 to boil, thereby increasing the pressure and temperature in the regenerator. The heat source after heat exchange is discharged through the steam accumulator heat source outlet valve 23.
As shown in fig. 1 and 2, the system operates as follows:
1) When the pressure of the steam drum 1 is higher than the set steam supply pressure, the steam inlet valve 11 is automatically opened, and the steam drum 1 supplies steam to the steam heat accumulator 2. When the pressure of the steam drum 1 is lower than the set steam supply pressure, the steam inlet valve 11 is automatically closed, and the steam drum 1 stops supplying steam to the steam heat accumulator 2.
When the steam supply flow rate of the steam drum 1 to the steam heat accumulator 2 is higher than the external steam supply, the steam heat accumulator 2 enters a heat charging state; when the flow rate of the steam supplied from the drum 1 to the heat accumulator 2 is lower than the external flow rate, the steam heat accumulator 2 enters an exothermic state.
2) When the pressure in the steam accumulator is reduced to the set heat supplementing pressure, the steam accumulator heat source inlet valve 22 and the heat source outlet valve 23 are opened, and the discharge valve 31 is closed. The condensed water in the heat accumulator is complemented by the heating tube bundle 21 to be boiled again, so that the pressure and the temperature in the heat accumulator are increased, and the pressure reducing speed of the steam heat accumulator in the heat release stage is slowed down. When the pressure in the accumulator is higher than the set heat-supplementing pressure, the heat source inlet valve 22 and the heat source outlet valve 23 of the steam accumulator are closed, and the discharge valve 31 is opened.
3) When the liquid level in the steam heat accumulator is higher than the set high liquid level value, the drain valve 25 is opened; when the liquid level is lower than the set high liquid level value, the drain valve 25 is closed. When the liquid level is below the set low level value, the water replenishment valve 24 is opened; when the liquid level is above the set high level value, the water replenishment valve 24 is closed.
4) The steam at the outlet of the steam heat accumulator 2 is superheated by the steam superheater 3.
The system realizes the effect of supplementing heat to the heat accumulator by using an external heat source through the heat accumulator heating tube bundle, improves the pressure in the heat accumulator in the heat release stage, and further can improve the pressure of steam sent out by the heat accumulator while realizing continuous and stable output of steam. Referring to fig. 2, compared with a conventional steam heat storage superheating system, the heat storage capacity of the system is larger under the same heat storage volume, and the pressure of the stored steam can be further improved, so that the quality of the steam is improved.
Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (2)
1. A steam heat accumulation superheating system, characterized in that: the system comprises a steam drum, a steam heat accumulator, a steam superheater and a control valve group; the steam drum, the steam heat accumulator and the steam superheater are connected in sequence; a heating tube bundle is arranged in the liquid phase space at the bottom of the steam heat accumulator; the steam superheater is connected with the heating tube bundle through a control valve group; the control valve group comprises a heat source inlet valve, a heat source outlet valve and a discharge valve; the outlet of the steam superheater is divided into two paths, one path is connected with the heating tube bundle through a heat source inlet valve, and the other path is directly discharged through a discharge valve; the outlet of the heating tube bundle is discharged through a heat source outlet valve; the heat source enters the steam superheater to heat the steam to be overheated, and the heat source after heat exchange is discharged from the steam superheater outlet.
2. The steam heat accumulation superheating system according to claim 1, characterized in that: the control valve group also comprises a water supplementing valve and a water draining valve which are connected with the steam heat accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811205031.5A CN109210524B (en) | 2018-10-16 | 2018-10-16 | Steam heat accumulation superheating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811205031.5A CN109210524B (en) | 2018-10-16 | 2018-10-16 | Steam heat accumulation superheating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109210524A CN109210524A (en) | 2019-01-15 |
| CN109210524B true CN109210524B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811205031.5A Active CN109210524B (en) | 2018-10-16 | 2018-10-16 | Steam heat accumulation superheating system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT106150B (en) * | 1923-06-07 | 1927-04-11 | Josef Ing Suck | Device for steam storage in boiler systems. |
| DE102013217607A1 (en) * | 2013-09-04 | 2015-03-05 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method of providing steam and steam delivery device |
| CN204902620U (en) * | 2015-08-14 | 2015-12-23 | 无锡红旗压力容器制造有限公司 | Steam heat accumulator fill heat facility |
| CN105201571A (en) * | 2015-10-14 | 2015-12-30 | 华北理工大学 | Converter double-heat-accumulator energy stacking, pressure stabilizing, heat accumulating and steam superheating system |
| CN107859986A (en) * | 2017-12-11 | 2018-03-30 | 中冶南方工程技术有限公司 | Produce the heat accumulator system of superheated steam |
| CN208998057U (en) * | 2018-10-16 | 2019-06-18 | 中冶赛迪工程技术股份有限公司 | A kind of steam accumulation of heat superheating system |
-
2018
- 2018-10-16 CN CN201811205031.5A patent/CN109210524B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT106150B (en) * | 1923-06-07 | 1927-04-11 | Josef Ing Suck | Device for steam storage in boiler systems. |
| DE102013217607A1 (en) * | 2013-09-04 | 2015-03-05 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method of providing steam and steam delivery device |
| CN204902620U (en) * | 2015-08-14 | 2015-12-23 | 无锡红旗压力容器制造有限公司 | Steam heat accumulator fill heat facility |
| CN105201571A (en) * | 2015-10-14 | 2015-12-30 | 华北理工大学 | Converter double-heat-accumulator energy stacking, pressure stabilizing, heat accumulating and steam superheating system |
| CN107859986A (en) * | 2017-12-11 | 2018-03-30 | 中冶南方工程技术有限公司 | Produce the heat accumulator system of superheated steam |
| CN208998057U (en) * | 2018-10-16 | 2019-06-18 | 中冶赛迪工程技术股份有限公司 | A kind of steam accumulation of heat superheating system |
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| Publication number | Publication date |
|---|---|
| CN109210524A (en) | 2019-01-15 |
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