CN110724538A - System and method for preparing saturated steam and superheated steam by recovering waste heat of coke oven ascending pipe - Google Patents
System and method for preparing saturated steam and superheated steam by recovering waste heat of coke oven ascending pipe Download PDFInfo
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- CN110724538A CN110724538A CN201911059646.6A CN201911059646A CN110724538A CN 110724538 A CN110724538 A CN 110724538A CN 201911059646 A CN201911059646 A CN 201911059646A CN 110724538 A CN110724538 A CN 110724538A
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- steam
- ascending
- heat exchangers
- deaerator
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- 230000001174 ascending effect Effects 0.000 title claims abstract description 74
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 59
- 239000000571 coke Substances 0.000 title claims abstract description 51
- 239000002918 waste heat Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 32
- 238000011033 desalting Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B27/00—Arrangements for withdrawal of the distillation gases
-
- 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
-
- 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
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/04—Carbon-containing material
- F27M2001/045—Coke
-
- 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
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention belongs to the technical field of waste heat utilization of a coke oven riser, and particularly relates to a system and a method for preparing saturated steam and superheated steam by recovering waste heat of the coke oven riser. The system comprises a first steam drum, a second steam drum, a forced circulation pump, a deaerator, a steam drum water feeding pump, a deaerator water feeding pump, a demineralized water tank, a first group of ascending pipe heat exchangers and a second group of ascending pipe heat exchangers; the desalting water tank is connected with the deaerator through a pipeline, the deaerator water feeding pump is installed on the pipeline connected with the deaerator through the pipeline, the deaerator is connected with the second steam drum through the pipeline, and the steam drum water feeding pump is installed on the pipeline connected with the deaerator and the second steam drum; the second steam drum is connected with the first group of ascending heat exchangers through a pipeline, the first group of ascending heat exchangers are connected with the second group of ascending heat exchangers through a pipeline, and the second group of ascending heat exchangers are connected with the first steam drum through a pipeline. The sensible heat of the raw gas can be fully utilized, saturated steam and superheated steam can be prepared in groups, and the comprehensive energy utilization rate is improved.
Description
Technical Field
The invention belongs to the technical field of waste heat utilization of a coke oven riser, and particularly relates to a system and a method for preparing saturated steam and superheated steam by recovering waste heat of the coke oven riser.
Background
At present, the coking industry is in the trend of 'little spring', under the large background of protecting the ecological environment, the waste heat utilization technology of a coke oven ascending pipe is gradually increased, most of domestic coke oven raw gas mainly adopts the mode of spraying 70-80 ℃ circulating ammonia water to take away sensible heat, and huge waste of energy is caused.
One of the reasons that the waste heat of the ascending pipe of the coke oven is not utilized on a large scale is that the temperature of the outlet of the raw gas is not easy to control, and the temperature of the outlet of the raw gas is too low easily in the operation process, so that tar is formed on the inner wall of the heat exchanger of the ascending pipe, when the condensed tar is burnt by the open fire in the coke oven, the phenomenon of black smoke is generated, the tar is generated in the gas after cooling, the heat exchange efficiency of the ascending pipe is influenced, the quality of the raw gas in the downstream chemical production section is also influenced, certain pressure is generated on the environment-friendly production, and the potential safety hazard is caused. Generally, the crude gas outlet temperature of the ascension pipe of the coke oven is maintained to be more than 450 ℃, so that the phenomenon of tar or slag formation can be effectively prevented.
When a plurality of coking enterprises want to obtain high-quality superheated steam, the temperature of raw gas at the outlet of a coke oven carbonization chamber is 650-850 ℃, after the high-temperature raw gas exchanges heat with the riser, if the temperature of the raw gas is reduced to below 450 ℃ due to excessive heat exchange, phenomena such as tar or gas slag formation of the riser can be generated, and the popularization of the utilization of the waste heat of the riser is restricted.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a system and a method for preparing saturated steam and superheated steam by recovering waste heat of a coke oven ascending pipe, which can fully utilize the sensible heat of raw gas, prepare the saturated steam and the superheated steam in groups and improve the comprehensive energy utilization rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for preparing saturated steam and superheated steam by recovering waste heat of ascending pipes of a coke oven comprises a first steam drum, a second steam drum, a forced circulation pump, a deaerator, a steam drum water feeding pump, a deaerator water feeding pump, a demineralized water tank, a first group of ascending pipe heat exchangers and a second group of ascending pipe heat exchangers; the desalting water tank is connected with the deaerator through a pipeline, the deaerator water feeding pump is installed on the pipeline connected with the deaerator through the pipeline, the deaerator is connected with the second steam drum through the pipeline, and the steam drum water feeding pump is installed on the pipeline connected with the deaerator and the second steam drum; the second steam drum is connected with the first group of ascending heat exchangers through a pipeline, the first group of ascending heat exchangers are connected with the second group of ascending heat exchangers through a pipeline, and the second group of ascending heat exchangers are connected with the first steam drum through a pipeline.
The first group of ascending heat exchangers comprise a plurality of ascending pipe heat exchangers connected in parallel, the ascending pipe heat exchangers are riser pipe type coke oven ascending pipe heat exchangers, the inlet temperature of the raw coke oven gas is 650-850 ℃ before heat exchange, and the outlet temperature of the raw coke oven gas is 450-550 ℃ after heat exchange.
The second group of ascending heat exchangers comprise a plurality of ascending pipe heat exchangers connected in parallel, the ascending pipe heat exchangers are riser pipe type coke oven ascending pipe heat exchangers, the inlet temperature of the raw coke oven gas is 650-850 ℃ before heat exchange, and the outlet temperature of the raw coke oven gas is 450-550 ℃ after heat exchange.
The deaerator is an atmospheric deaerator or a low-pressure rotary film deaerator.
The second steam drum generates saturated steam, the saturated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 165-185 ℃;
the first steam drum generates superheated steam, the superheated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 200-250 ℃.
A method for preparing saturated steam and superheated steam by recovering waste heat of a coke oven ascending pipe comprises the following steps:
1) the outer net desalted water enters a desalted water tank, enters a deaerator through a deaerating water feeding pump to be deaerated, a heating steam source is a saturated steam system, and deaerated water is sent to a second steam drum through a steam drum water feeding pump to produce saturated steam;
2) the riser heat exchangers of the riser-tube coke oven are divided into two groups, each group is connected with 5 riser heat exchangers in parallel, and the two groups of riser heat exchangers exchange heat with raw coke oven gas respectively to generate a saturated steam-water mixture and an overheated steam-water mixture;
3) and the second steam drum produces saturated steam, the furnace water is sent to the first group of ascending pipe heat exchangers through a forced circulation pump, one part of the produced saturated steam-water mixture enters the second group of ascending pipe heat exchangers, the other part of the produced saturated steam mixture enters the second steam drum to produce saturated steam, the saturated steam mixture is subjected to steam-liquid separation to produce saturated steam, one part of the saturated steam mixture is sent to an outer net, and the other part of the saturated steam mixture is sent to a deaerator to be heated.
4) The second group of riser heat exchangers generate superheated steam-water mixture, the superheated steam-water mixture enters the first steam drum to generate superheated steam, and the superheated steam is generated through steam-liquid separation and sent to the outer net.
Compared with the prior art, the invention has the beneficial effects that:
the invention can not reduce the outlet temperature of the raw gas, but also can obtain high-quality steam, fully utilizes the waste heat of the raw gas, respectively prepares saturated steam and superheated steam with different qualities, and improves the comprehensive energy utilization rate.
Drawings
FIG. 1 is a schematic diagram of the structure and process flow of the present invention.
In the figure: 1. a first steam pocket 2, a second steam pocket 3, a forced circulation pump 4, a deaerator 5, a steam pocket water feed pump 6, a deaerating water feed pump 7, a demineralized water tank 8, a first riser double-pipe coke oven riser heat exchanger 9, a second riser double-pipe coke oven riser heat exchanger 10, a first group of riser heat exchangers 11, a second group of riser heat exchangers 11
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
example (b):
a system for preparing saturated steam and superheated steam in groups by recovering waste heat of ascending pipes of a coke oven comprises a first steam drum 1, a second steam drum 2, a forced circulation pump 3, a deaerator 4, a steam drum water feed pump 5, a deaerating water feed pump 6, a demineralized water tank 7, a first group of ascending pipe heat exchangers 10 and a second group of ascending pipe heat exchangers 11.
The first group of ascending heat exchangers 10 comprises 5 ascending pipe heat exchangers connected in parallel, the ascending pipe heat exchangers are first riser pipe type coke oven ascending pipe heat exchangers 8, the inlet temperature of the raw coke oven gas is 650-850 ℃ before heat exchange, and the outlet temperature of the raw coke oven gas is 450-550 ℃ after heat exchange.
The second group of ascending heat exchangers 11 comprise 5 ascending pipe heat exchangers connected in parallel, the ascending pipe heat exchangers are second riser sleeve type coke oven ascending pipe heat exchangers 9, the inlet temperature of the raw coke oven gas is 650-850 ℃ before heat exchange, and the outlet temperature of the raw coke oven gas is 450-550 ℃ after heat exchange.
The deaerator 4 is an atmospheric deaerator or a low-pressure rotary film deaerator.
The second steam drum 2 generates saturated steam, the saturated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 165-185 ℃;
the first steam drum 1 generates superheated steam, the superheated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 200-250 ℃.
The desalting water tank 7 is connected with the deaerator 4 through a pipeline, the deaerator water feed pump 6 is installed on the pipeline connecting the desalting water tank 7 with the deaerator 4, the deaerator 4 is connected with the second steam pocket 2 through a pipeline, and the steam pocket water feed pump 5 is installed on the pipeline connecting the deaerator 4 with the second steam pocket 2; the second steam drum 2 is connected with a first group of ascending heat exchangers 10 through pipelines, the first group of ascending heat exchangers 10 are connected with a second group of ascending heat exchangers 11 through pipelines, and the second group of ascending heat exchangers 11 are connected with the first steam drum 1 through pipelines.
A method for preparing saturated steam and superheated steam in groups by recovering waste heat of ascending pipes of a coke oven comprises the following steps:
(1) the outer net demineralized water enters a demineralized water tank 7, enters a deaerator 4 for deaerating through a deaerating water feed pump 6, the heating steam source is a saturated steam system, deaerated water is sent to a steam drum 2 (producing saturated steam) through a steam drum water feed pump 5, the saturated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 165-185 ℃.
(2) The riser heat exchangers of the riser-tube coke oven are divided into two groups, and a first group of riser heat exchanger systems 10 are connected with 5 riser heat exchangers 8 in parallel; the second group of riser heat exchanger systems 11 is connected in parallel with 5 riser heat exchangers 9; the two groups of ascending pipe heat exchangers 10 and 11 respectively exchange heat with raw coke oven gas to generate a saturated steam-water mixture and an overheated steam-water mixture.
(3) Boiler water of a steam drum 2 (generating saturated steam) is sent to a first group of ascending pipe heat exchanger systems 10 through a forced circulation pump 3, a part of generated saturated steam-water mixture enters a second group of ascending pipe heat exchanger systems 11, the other part of the generated saturated steam-water mixture enters the steam drum 2 (generating saturated steam), the saturated steam is generated through steam-liquid separation, one part of the generated saturated steam is sent to an outer net, and the other part of the generated saturated steam is sent to a deaerator 4 for heating.
(4) The second group of ascending tube heat exchanger systems 11 generate superheated steam-water mixture, the superheated steam-water mixture enters the steam drum 1 (generates superheated steam), the superheated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 200-250 ℃. Through vapor-liquid separation, superheated steam is generated and sent to an outer net.
The invention is suitable for recycling waste heat of the ascending pipe of the coke oven and waste heat of crude gas of other similar working media, and has the following advantages:
1. the temperature of the raw gas outlet is not reduced, and high-quality steam can be obtained.
2. The waste heat of the raw gas is fully utilized to respectively prepare saturated steam and superheated steam with different qualities, and the comprehensive energy utilization rate is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The system for preparing saturated steam and superheated steam by recovering waste heat of the ascending tube of the coke oven is characterized by comprising a first steam drum, a second steam drum, a forced circulation pump, a deaerator, a steam drum water feeding pump, a deaerating water feeding pump, a demineralized water tank, a first group of ascending tube heat exchangers and a second group of ascending tube heat exchangers; the desalting water tank is connected with the deaerator through a pipeline, the deaerator water feeding pump is installed on the pipeline connected with the deaerator through the pipeline, the deaerator is connected with the second steam drum through the pipeline, and the steam drum water feeding pump is installed on the pipeline connected with the deaerator and the second steam drum; the second steam drum is connected with the first group of ascending heat exchangers through a pipeline, the first group of ascending heat exchangers are connected with the second group of ascending heat exchangers through a pipeline, and the second group of ascending heat exchangers are connected with the first steam drum through a pipeline.
2. The system for preparing saturated steam and superheated steam by recovering waste heat of the ascending pipes of the coke oven according to claim 1, wherein the first group of ascending heat exchangers comprises a plurality of ascending pipe heat exchangers connected in parallel, each ascending pipe heat exchanger is a riser pipe type coke oven ascending pipe heat exchanger, the inlet temperature of the raw coke gas before heat exchange is 650-850 ℃, and the outlet temperature of the raw coke gas after heat exchange is 450-550 ℃.
3. The system for preparing saturated steam and superheated steam by recovering waste heat of the coke oven ascending pipes according to claim 1, wherein the second group of ascending heat exchangers comprises a plurality of ascending pipe heat exchangers connected in parallel, each ascending pipe heat exchanger is a riser pipe type coke oven ascending pipe heat exchanger, the inlet temperature of the raw coke gas before heat exchange is 650-850 ℃, and the outlet temperature of the raw coke gas after heat exchange is 450-550 ℃.
4. The coke oven riser waste heat recovery saturated steam and superheated steam production system of claim 1, wherein the deaerator is an atmospheric deaerator or a low pressure rotary film deaerator.
5. The system for preparing saturated steam and superheated steam by recovering the waste heat of the ascending pipe of the coke oven according to claim 1, wherein the second steam drum generates saturated steam, the saturated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 165-185 ℃.
6. The system for preparing saturated steam and superheated steam by recovering the waste heat of the ascending pipe of the coke oven according to claim 1, wherein the first steam drum generates superheated steam, the superheated steam is low-pressure steam, the steam pressure is 0.6-1.0 MPa, and the steam temperature is 200-250 ℃.
7. A method for preparing saturated steam and superheated steam by recovering waste heat of a coke oven ascending pipe based on the system of claim 1 is characterized by comprising the following steps:
1) the outer net desalted water enters a desalted water tank, enters a deaerator through a deaerating water feeding pump to be deaerated, a heating steam source is a saturated steam system, and deaerated water is sent to a second steam drum through a steam drum water feeding pump to produce saturated steam;
2) the riser heat exchangers of the riser-tube coke oven are divided into two groups, each group is connected with 5 riser heat exchangers in parallel, and the two groups of riser heat exchangers exchange heat with raw coke oven gas respectively to generate a saturated steam-water mixture and an overheated steam-water mixture;
3) and the second steam drum produces saturated steam, the furnace water is sent to the first group of ascending pipe heat exchangers through a forced circulation pump, one part of the produced saturated steam-water mixture enters the second group of ascending pipe heat exchangers, the other part of the produced saturated steam mixture enters the second steam drum to produce saturated steam, the saturated steam mixture is subjected to steam-liquid separation to produce saturated steam, one part of the saturated steam mixture is sent to an outer net, and the other part of the saturated steam mixture is sent to a deaerator to be heated.
4) The second group of riser heat exchangers generate superheated steam-water mixture, the superheated steam-water mixture enters the first steam drum to generate superheated steam, and the superheated steam is generated through steam-liquid separation and sent to the outer net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059646.6A CN110724538A (en) | 2019-11-01 | 2019-11-01 | System and method for preparing saturated steam and superheated steam by recovering waste heat of coke oven ascending pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059646.6A CN110724538A (en) | 2019-11-01 | 2019-11-01 | System and method for preparing saturated steam and superheated steam by recovering waste heat of coke oven ascending pipe |
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| CN110724538A true CN110724538A (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911059646.6A Pending CN110724538A (en) | 2019-11-01 | 2019-11-01 | System and method for preparing saturated steam and superheated steam by recovering waste heat of coke oven ascending pipe |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203837504U (en) * | 2014-03-28 | 2014-09-17 | 韩培 | Ascension tube raw coke oven gas sensible heat recovery system for coke oven |
| CN208594234U (en) * | 2018-06-14 | 2019-03-12 | 西藏明汇资产管理有限公司 | A kind of residual heat heat-exchanging device recycling raw coke over gas riser |
| CN210855971U (en) * | 2019-11-01 | 2020-06-26 | 中冶焦耐(大连)工程技术有限公司 | System for preparing saturated steam and superheated steam in groups by recovering waste heat of ascending pipe of coke oven |
-
2019
- 2019-11-01 CN CN201911059646.6A patent/CN110724538A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203837504U (en) * | 2014-03-28 | 2014-09-17 | 韩培 | Ascension tube raw coke oven gas sensible heat recovery system for coke oven |
| CN208594234U (en) * | 2018-06-14 | 2019-03-12 | 西藏明汇资产管理有限公司 | A kind of residual heat heat-exchanging device recycling raw coke over gas riser |
| CN210855971U (en) * | 2019-11-01 | 2020-06-26 | 中冶焦耐(大连)工程技术有限公司 | System for preparing saturated steam and superheated steam in groups by recovering waste heat of ascending pipe of coke oven |
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