CN103388817A - Residual heat recovery system of sewage water of coke dry quenching boiler - Google Patents
Residual heat recovery system of sewage water of coke dry quenching boiler Download PDFInfo
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- CN103388817A CN103388817A CN2013102964026A CN201310296402A CN103388817A CN 103388817 A CN103388817 A CN 103388817A CN 2013102964026 A CN2013102964026 A CN 2013102964026A CN 201310296402 A CN201310296402 A CN 201310296402A CN 103388817 A CN103388817 A CN 103388817A
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Abstract
The invention relates to a residual heat recovery system of sewage water of a coke dry quenching boiler. The system is characterized in that a sewage water heat exchanger is additionally arranged, desalting water which is delivered to an auxiliary coal saver by a water feed pump of a deaerator is used as a cooling medium to exchange heat with the sewage water nearby, and then the heat-exchanged desalting water is delivered to the deaerator to be deaerated. The system has the advantages that the problem of quantity distribution of water entering the heat exchanger and the auxiliary coal saver is avoided, and the operation and the control are convenient; the temperature of the desalting water entering the heat exchanger is minimum, the heat exchange temperature difference is high, and the heat recovery effect is good; the temperature of air at an inlet of the coke dry quenching boiler is controlled to 115 DEG C to 135 DEG C, and the temperature of actual running is controlled to about 125 DEG C and has a space of 10 DEG C from the maximum temperature, so the adjusting capability is high; and in addition, the quantity of circulating air is higher, so the temperature of the water entering the auxiliary coal saver is raised by about 8 DEG C in comparison with the temperature of the previous arrangement, the effect on the temperature of circulating air is little, and the running parameters of a coke dry quenching groove and the boiler are controlled within the specified range.
Description
Technical field
The present invention relates to the new system of dry coke quenching waste heat recovery, belongs to the coking engineering projects technology, is specifically related to a kind of recovery system of coke dry quenching boiler sewer waste heat.
Background technology
Present in the coke dry quenching boiler running, owing to containing some impurity in boiler feedwater, continuous evaporation and concentration in boiler, increase water salt content in boiler gradually; To dosing in boiler water, some products are deposited in drum in addition, thereby boiler water and steam quality are worsened., in order to keep steam quality within the specific limits, must carry out blowdown to boiler water.Common blowdown mode has continuous blowdown and periodical blowdown.
Continuous blowdown be continuously from boiler the water that salt content is large be discharged to continuous blowdown flash tank, supplement purer water to boiler simultaneously, to keep the normal salt content of stove water.
Periodical blowdown is the minimum point from the steam face,, perhaps from the minimum point of drum and from each header of boiler, enter regular unloading container, is deposited in sediment, the iron rust of drum bottom with discharge, in case dirt or the tamper of these impurity in heating surface piping.Regular Drain system is the deficiency of supplement boiler continuous blowdown, to improve boiler water quality.
Under normal circumstances, the boiler design blowdown flow rate is generally 1% ~ 2% of boiler rating, and this part sewer directly enters outer gutter after entering the blowdown cooling tank by blowdown system, not only has heat to run off, also in the place that sewer is flowed through, produce steam, have certain potential safety hazard.
Summary of the invention
Purpose of the present invention just is to provide a kind of steam that used heat and elimination are filled the air that takes full advantage of, and the used heat that boiler blowdown water is taken out of reclaims by heat exchanger and demineralized water heat exchange.If the heat that sewer is taken away all reclaims, the water temperature of 65t water can be improved approximately 8 ℃, can reduce the recovery system that is about the coke dry quenching boiler sewer waste heat of 0.86 t/h for the low-pressure saturated steam consumption of 160 ℃ of oxygen-eliminating device thermal de-aeration.
Solution of the present invention is such: in the system that the waste heat boiler in legacy system, desalination water pump, sweet-water tank, deaerator feed water pump, secondary economizer, oxygen-eliminating device, circulating fan, waste heat boiler form, be provided with heat exchanger, described heat exchanger is used demineralized water as cooling medium, and demineralized water and the sewer of doing burnt boiler are carried out heat exchange at heat exchanger.
Technical scheme also comprises more specifically: described heat exchanger is to receive the demineralized water that deaerator feed water pump provides, and the demineralized water that will carry out after heat exchange is sent into secondary economizer.
Further: the demineralized water temperature of described heat exchanger exit is at 30 ℃-80 ℃.
Advantage of the present invention is:
(1) avoided advancing the water yield assignment problem of heat exchanger and secondary economizer, convenient operation is controlled;
(2) advance the desalination water temperature of heat exchanger minimum, heat transfer temperature difference is large, and the recuperation of heat effect is high;
(3) because the dried stove gasinlet temperature that puts out is controlled at 115 ℃～135 ℃, actual motion is controlled at 125 ℃ of left and right,, from the space of 10 ℃ of the highest existences, regulates leeway larger; Separately, air circulation is larger, therefore though the water temperature of advancing secondary economizer than not raising approximately 8 ℃ before transformation, little on the impact of recyclegas temperature, i.e. dried putting out in the scope that groove, boiler operating parameter all can be controlled in regulation.
Example with practical probation further describes effect of the present invention:
(1) process operation situation: in order to carry out Contrast on effect, the selected coke oven turnaround time is identical, and the data of the period that the boiler blow-off amount is close are analyzed (in Table 1).After transformation increases heat exchanger, driedly put out the stove gasinlet temperature, air circulation does not have large variation, oxygen-eliminating device entrance mean temperature has increased by 7.3 ℃, and other changes in process parameters is also little, still within control range, whole dry quenching system normal operation.
Operational factor before and after No. 1 coke dry quenching boiler sewer waste heat recovery of table 1 transformation
| ? | Before transformation | After transformation |
| The dried stove number/stove that puts out | 123.0 | 124.0 |
| Total confluent/(th -1） | 65.7 | 64.5 |
| Evaporation capacity/(th -1） | 57.6 | 56.2 |
| Dried put out the stove gasinlet temperature/℃ | 124.7 | 124.2 |
| The oxygen-eliminating device inlet temperature/℃ | 68.1 | 75.4 |
| Coke discharging amount/(th -1） 1 | 129.7 | 147.7 |
| Air circulation (under the mark state)/(m 3·h -1） | 151195.7 | 149362.0 |
| Spray water flux/(th -1） | 6.4 | 6.6 |
| The coke discharging temperature/℃ | 118.5 | 125.2 |
| Water amount of blowdown (th -1） | 1.7 | 1.7 |
(2) heat recovery rate and benefit: dry coke quenching reclaims the waste heat of sewer by setting up heat exchanger, under identical working condition (the coke oven turnaround time is identical and blowdown flow rate is close), the oxygen-eliminating device inlet water temperature has improved 7.3 ℃ before implementing, effect is fine.Improve 7.3 ℃ of calculations according to temperature, the heat Q1 that demineralized water reclaims is about 1.9 * 106 kJ/h; Actual residual heat stream vector Q2 is about 2.3 * 106 kJ/h; Heat recovery rate is: 82.6%; The low-pressure saturated steam consumption of 160 ℃ that can reduce for the oxygen-eliminating device thermal de-aeration is about 0.713 t/h; The year recuperation of heat can reduce oxygen-eliminating device low-pressure steam consumption costs and be (115 yuan/tons of low-pressure steam valencys): more than 70 ten thousand yuan.
Description of drawings
Accompanying drawing is embodiments of the invention.
Fig. 1 is that this system of the present invention forms schematic diagram.
The specific embodiment
The present embodiment is to adopt demineralized water after deaerator feed water pump is first passed through heat exchanger, by secondary economizer, then goes the series system of oxygen-eliminating device to arrange, as shown in Figure 1; By setting up the sewer heat exchanger, the demineralized water that utilizes deaerator feed water pump to be sent to secondary economizer nearby carries out heat exchange as cooling medium and sewer, demineralized water after exchange is transmitted back to the oxygen-eliminating device deoxygenation again, advance like this demineralized water of oxygen-eliminating device because the heat temperature that has reclaimed sewer raises to some extent, can reduce the required quantity of steam of thermal de-aeration
In the system that waste heat boiler in legacy system, desalination water pump, sweet-water tank, deaerator feed water pump, secondary economizer, oxygen-eliminating device, circulating fan, waste heat boiler form, increase and be provided with heat exchanger, described heat exchanger is used demineralized water as cooling medium, and demineralized water and the sewer of doing burnt boiler are carried out heat exchange at heat exchanger.
Described heat exchanger is to receive the demineralized water that deaerator feed water pump provides, the demineralized water that will carry out after heat exchange is sent into secondary economizer, the demineralized water temperature of described heat exchanger exit is controlled at 30 ℃-80 ℃, and when the demineralized water temperature of heat exchanger exit was controlled at 60 ℃-70 ℃, the running of system was better.
Claims (3)
1. do burnt boiler blowdown water residual neat recovering system for one kind, comprise waste heat boiler, desalination water pump, sweet-water tank, deaerator feed water pump, secondary economizer, oxygen-eliminating device, circulating fan, waste heat boiler, it is characterized in that: be provided with heat exchanger, described heat exchanger is used demineralized water as cooling medium, and demineralized water and the sewer of doing burnt boiler are carried out heat exchange at heat exchanger.
2. dried burnt boiler blowdown water residual neat recovering system according to claim 1 is characterized in that: described heat exchanger is to receive the demineralized water that deaerator feed water pump provides, and the demineralized water that will carry out after heat exchange is sent into secondary economizer.
3. dried burnt boiler blowdown water residual neat recovering system according to claim 1 and 2, it is characterized in that: the demineralized water temperature of described heat exchanger exit is at 30 ℃-80 ℃.
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| CN2013102964026A CN103388817A (en) | 2013-07-16 | 2013-07-16 | Residual heat recovery system of sewage water of coke dry quenching boiler |
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| CN2013102964026A CN103388817A (en) | 2013-07-16 | 2013-07-16 | Residual heat recovery system of sewage water of coke dry quenching boiler |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105542801A (en) * | 2016-02-22 | 2016-05-04 | 山东钢铁股份有限公司 | Boiler-discharged-wastewater treating device and method for coke dry quenching system |
| CN105702311A (en) * | 2014-11-28 | 2016-06-22 | 上海核工程研究设计院 | An ultrasonic decontamination system for radioactive work pieces of nuclear plants |
| CN107858153A (en) * | 2017-11-14 | 2018-03-30 | 北京华泰焦化工程技术有限公司 | Coke dry quenching furnace and the dry coke quenching circulatory system |
| CN106287655B (en) * | 2016-08-12 | 2018-05-01 | 中节能嘉兴建筑能源有限公司 | A kind of steam heat recovery technique |
| CN107990301A (en) * | 2017-12-28 | 2018-05-04 | 东方菱日锅炉有限公司 | Waste heat boiler feedwater deaerating system |
| CN108444304A (en) * | 2018-05-17 | 2018-08-24 | 山东焦化技术咨询服务有限公司 | A kind of waste heat of coke oven crude gas recycling system |
| CN108731004A (en) * | 2018-05-28 | 2018-11-02 | 光大环保技术研究院（南京）有限公司 | The cooling back installation and waste incineration and generating electricity device of water-cooled grate |
| CN109210523A (en) * | 2018-10-12 | 2019-01-15 | 河北超绿节能环保科技有限公司 | A kind of boiler blowdown water residual neat recovering system |
| CN111174195A (en) * | 2020-01-10 | 2020-05-19 | 安徽金禾实业股份有限公司 | Method for recycling waste heat of synthetic ammonia conversion gas |
| CN112780364A (en) * | 2021-01-19 | 2021-05-11 | 山西太钢不锈钢股份有限公司 | Method for prolonging running time of dry quenching steam turbine generator |
| CN113620561A (en) * | 2020-05-08 | 2021-11-09 | 同方环境股份有限公司 | Novel sludge drying heat recovery system |
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| CN2644898Y (en) * | 2003-08-05 | 2004-09-29 | 郑刚 | Boiler blow-off waste heat recovering equipment |
| RU2338968C1 (en) * | 2007-02-19 | 2008-11-20 | Закрытое акционерное общество "НПО Энергосберегающие технологии" | Method of utilisation of impure sewage water heat and preparation of hot coolant |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702311A (en) * | 2014-11-28 | 2016-06-22 | 上海核工程研究设计院 | An ultrasonic decontamination system for radioactive work pieces of nuclear plants |
| CN105542801B (en) * | 2016-02-22 | 2018-07-10 | 山东钢铁股份有限公司 | A kind of boiler blow-off water treatment facilities and method for dry quenching system |
| CN105542801A (en) * | 2016-02-22 | 2016-05-04 | 山东钢铁股份有限公司 | Boiler-discharged-wastewater treating device and method for coke dry quenching system |
| CN106287655B (en) * | 2016-08-12 | 2018-05-01 | 中节能嘉兴建筑能源有限公司 | A kind of steam heat recovery technique |
| CN107858153A (en) * | 2017-11-14 | 2018-03-30 | 北京华泰焦化工程技术有限公司 | Coke dry quenching furnace and the dry coke quenching circulatory system |
| CN107858153B (en) * | 2017-11-14 | 2023-09-22 | 华泰永创(北京)科技股份有限公司 | Dry quenching furnace and dry quenching circulating system |
| CN107990301B (en) * | 2017-12-28 | 2022-12-02 | 东方菱日锅炉有限公司 | Water supply and oxygen removal system of waste heat boiler |
| CN107990301A (en) * | 2017-12-28 | 2018-05-04 | 东方菱日锅炉有限公司 | Waste heat boiler feedwater deaerating system |
| CN108444304A (en) * | 2018-05-17 | 2018-08-24 | 山东焦化技术咨询服务有限公司 | A kind of waste heat of coke oven crude gas recycling system |
| CN108731004A (en) * | 2018-05-28 | 2018-11-02 | 光大环保技术研究院（南京）有限公司 | The cooling back installation and waste incineration and generating electricity device of water-cooled grate |
| CN109210523A (en) * | 2018-10-12 | 2019-01-15 | 河北超绿节能环保科技有限公司 | A kind of boiler blowdown water residual neat recovering system |
| CN111174195A (en) * | 2020-01-10 | 2020-05-19 | 安徽金禾实业股份有限公司 | Method for recycling waste heat of synthetic ammonia conversion gas |
| CN113620561A (en) * | 2020-05-08 | 2021-11-09 | 同方环境股份有限公司 | Novel sludge drying heat recovery system |
| CN112780364A (en) * | 2021-01-19 | 2021-05-11 | 山西太钢不锈钢股份有限公司 | Method for prolonging running time of dry quenching steam turbine generator |
| CN112780364B (en) * | 2021-01-19 | 2022-11-25 | 山西太钢不锈钢股份有限公司 | Method for prolonging running time of dry quenching steam turbine generator |
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Application publication date: 20131113 |