CN103691260B - Heat recovery water-saving system for desulfuration by wet process and process thereof - Google Patents
Heat recovery water-saving system for desulfuration by wet process and process thereof Download PDFInfo
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- CN103691260B CN103691260B CN201310718023.1A CN201310718023A CN103691260B CN 103691260 B CN103691260 B CN 103691260B CN 201310718023 A CN201310718023 A CN 201310718023A CN 103691260 B CN103691260 B CN 103691260B
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Abstract
The invention relates to a heat recovery water-saving system for desulfuration by a wet process and a process method thereof. The process method comprises the following steps: carrying out heat exchange on waste heat of slurry of an absorption tower in a conventional wet gas desulphurization device through an external heat exchanger, wherein the temperature of the slurry in the tower is reduced; pumping the slurry in the tower at lower temperature to a spraying layer through a circulating pump; and continuously carrying out gas-liquid contact in the desulphurization process. The lower temperature of the desulphurization slurry is beneficial for improving the desulphurization efficiency and reducing the liquid-gas ratio in the desulphurization process; the temperature of the desulphurization smoke is reduced from about 130 DEG C to about 40 DEG C similarly, smoke heat is conducted to circular slurry and recovered by the external heat exchanger, and the evaporated water in the smoke temperature reducing process is reduced, so that the water consumption in a wet desulphurization system is reduced; and the purposes of saving energy consumption and water consumption for users as well as lowering the operational cost are realized. Meanwhile, through heat transfer temperature rise of the external heat exchanger, the cooling circular water is about 27 DEG C, and hot water at higher temperature or low pressure steam over 120 DEG C through hot pump treatment is provided for users.
Description
Technical field
The present invention relates to the recuperation of heat water saving system in Wet Flue Gas Desulfurization Technique field, particularly Wet Process of FGD Project
System and its technique.
Background technology
With the promulgation of thermal power plant's Air Pollutant Emission new standard, sulfur dioxide in flue gas discharge standard is entered
One step improve, along with domestic power plant soot it is in short supply, the actually used coal-fired ature of coal of many power plant into
Divide very big with original design value deviation, cause desulfurizer entrance sulfur dioxide concentration far beyond original design
Value, original desulfurizer can not meet the requirement of environmental protection, to guarantee the safe and stable operation of desulphurization system
And the requirement of qualified discharge is met under the conditions of new ature of coal, just original desulfurizer must be increased
Hold transformation, raising desulfuration efficiency of adopting various measures at present, before existing absorption tower entrance heat exchanger is installed additional,
Former flue-gas temperature is reduced, is reached and is put forward efficient purpose.In addition, China's energy shortage, energy saving,
Unnecessary reusing of energy source is extremely urgent.A kind of recuperation of heat water saving of wet desulphurization has been invented in this context
Technique.
The content of the invention
It is an object of the invention to de- efficiency is improved, the recycling of heat energy, energy saving in tower.
For achieving the above object, the technical scheme taken of the present invention is：A kind of recuperation of heat of wet desulphurization
Water-saving system, including absorption tower, also including n platform circulating pumps, heat pump, n-layer spraying layer, a fortune
One for water pump, n >=1；Wherein,
Pipeline connects between absorption tower and circulating pump are imported and exported, pump inlet cloth
Valve eight is put, pipeline connection between absorption tower and slurry feeding pump, and arrange valve nine；Serosity is defeated
Pipeline connection between pump discharge and heat exchanger is sent, and arranges valve 11；Heat exchanger serum outlet with
Pipeline connection between absorption tower, and arrange valve ten and valve 12；Manage between heat exchanger and water pump
Road connects, and arranges valve 13, again by carbon steel piping connection between heat pump and heat exchanger, and arranges
Valve 14, pipeline connection between water pump and heat pump, and arrange valve 15；The system constitutes three
Individual circulation：First circulation：Absorption tower-slurry feeding pump-heat exchanger-absorption tower；Second circulation：
Absorption tower-circulating pump-spraying layer-absorption tower；3rd circulation：Heat exchanger-water pump-heat pump-heat exchange
Device.
Further, the circulating pump quantity is determined by the requirement of former sulfur removal technology.
A kind of recuperation of heat water saving art of wet desulphurization, comprises the following steps:
The first step：The slurry feeding pump that absorption tower side is arranged, by high temperature serosity in tower heat exchanger is squeezed into,
Serosity after heat exchanger exchanges heat, temperature reduces entering back in tower, so allows for the serosity in tower
Become low temperature serosity；
Second step：Low temperature serosity is squeezed into the spraying layer on absorption tower, low temperature serosity and entrance by circulating pump
The high temperature original smoke contacts on absorption tower, carry out heat exchange and SO2Absorption process, so both reached de-
The purpose of sulfur reduces evaporation of water again；
3rd step：The water Jing water pumps for exchanging heat out through heat exchanger squeeze into heat pump, are then produced by heat pump
Go out hot water or low-pressure steam, for users to use；Water after being cooled down by heat pump returns to heat exchanger to be carried out again
Heat exchange.
Further, the temperature of the high temperature serosity is 38-50 DEG C.
Further, the temperature of the low temperature serosity is 30-34 DEG C.
Further, the coolant-temperature gage for exchanging heat out through heat exchanger is 25-28 DEG C.
Further, the temperature of the low-pressure steam is 100-120 DEG C.
Further, the coolant-temperature gage after the cooling by heat pump is 18-20 DEG C.
Beneficial effects of the present invention be summarized as it is following some：
1st, absorption tower rate of water make-up is reduced, saves operating cost.
2nd, the hot water or low-pressure steam needed for user can be produced.
3rd, desulfuration efficiency is improved
4th, former flue reduces construction costs without anti-corrosion.
5th, the process system equipment is simple, technique is smooth, stable.
Description of the drawings
Accompanying drawing is the process system schematic flow sheet of the present invention.
Specific embodiment
The process implementing invented is illustrated below in conjunction with accompanying drawing：
A kind of heat recovering process capital equipment of wet desulphurization is as follows：1 one, absorption tower；Circulating pump 2 is counted
Amount is fixed by the requirement of former sulfur removal technology, general 3；Slurry feeding pump 3 two a, fortune one is standby；Heat exchanger
4 one；7 two, water pump a, fortune one is standby；Heat pump 5 one；The quantity of spraying layer 6 is by former sulfur removal technology
It is fixed.
Pipeline connects between absorption tower 1 and circulating pump 2 are imported and exported, the import of circulating pump 2 arrangement valve 88,
Pipeline connection between absorption tower 1 and slurry feeding pump 3, and arrange valve 99；Slurry feeding pump 3 is exported
Pipeline is connected between heat exchanger 4, and arranges valve 11；The serum outlet of heat exchanger 4 and absorption tower
Pipeline connection between 1, and arrange the valve 12 of valve 10；Manage between heat exchanger 4 and water pump 7
Road connects, and arranges valve 13, is connected by carbon steel piping again between heat pump 5 and heat exchanger, and cloth
Valve 14 is put, water pump 7 is arranged near absorption tower 1 with heat pump 5, technical process can pass through three
Individual systemic circulation is realizing.
First circulation：Absorption tower 1-- slurry feeding pump 3-- heat exchanger 4-- absorption towers 1
Connected with rubber lined pipe between absorption tower 1 and slurry feeding pump 3, and arrange valve 99；Delivery pump
Connected with rubber lined pipe between 3 outlets and heat exchanger 4, and arrange valve 11；Serosity in absorption tower
Heat exchanger 4 is squeezed into by slurry feeding pump.Also line with rubber is used between the serum outlet of heat exchanger 4 and absorption tower 1
Pipeline connects, and arranges valve 10, the serosity after heat exchange, and about 32 DEG C or so of temperature goes back to absorption tower 1.
The slurry temperature of absorption tower 1 generally about at 40 DEG C or so, is squeezed into by slurry feeding pump 3
Heat exchanger 4, by higher temperatures serosity low temperature serosity (about 32 DEG C or so) is changed into, and is recycled to absorption
In tower 1, such low temperature serosity squeezes into spraying layer 6 in tower through circulating pump 2 again, sufficiently cool flue gas,
Absorption tower import cigarette temperature can be thus caused equally to be reduced to 40 DEG C or so the benefits for being used by 130 DEG C or so
Discharge reduction, reduces operating cost.
Second circulation：Absorption tower 1-- circulating pump 2-- spraying layer 6-- absorption towers 1
Circulating pump 2 is imported and exported and connected with rubber lined pipe and absorption tower 1 between, the import arrangement of valves of circulating pump 2
88,32 DEG C or so absorption tower serosity of door squeeze into spraying layer 6 by circulating pump, with absorption tower entrance original flue gas
Carrying out contact carries out heat exchange and SO2Absorption.So as to reach the purpose of desulfurization.
The working mechanism of flue gas desulfurization, is SO2The interphase mass transfer process of liquid phase, mass transfer are delivered to from gas phase
Speed is the key index for determining desulfuration efficiency.The key factor for affecting mass transfer rate is exactly temperature, temperature
It is more low more be conducive to SO2Solution absorption, consider in absorption tower slurry temperature about at 30-50 DEG C
Most preferably.This technique can pass through the heat exchange amount of the outer row's heat exchanger of adjustment, i.e., by adjusting circulating cooling current
Measure or adjust circulating cooling coolant-temperature gage to adjust absorption tower interior circulation slurry temperature, make absorption tower entoplasm liquid temperature
Degree reaches optimum, is conducive to improving desulfuration efficiency.
3rd circulation：Heat exchanger 4-- water pump 7-- heat pump 5-- heat exchangers 4
Connected with carbon steel piping between heat exchanger 4 and water pump 7, and arrange valve 13, water pump 7
It is connected with carbon steel piping between heat pump 5, and arranges valve 15, through water (the 27 DEG C of left side for exchanging heat
It is right) heat pump is thrown into by water pump, the hot water or 120 DEG C or so of low pressure of different temperatures are produced by heat pump
Steam.Again by carbon steel piping connection between heat pump 5 and heat exchanger, and valve 14 is arranged, it is so cold
But the water (20 DEG C or so) after is returned to heat exchanger carries out heat exchange again.Circulation in heat exchanger 4 is cold
But water (the 20 DEG C or so) temperature after heat exchange about brings up to 27 DEG C or so, then follows through water pump 7
To heat pump 5, heat pump 5 produces the temperature required hot water of user or low-pressure steam to ring.At present, state's endogenous dampness
Install heat exchanger before the employing absorption tower entrance that method sulfur removal technology has additional, flue-gas temperature is reduced, so as to reach section
Water, the purpose for improving desulfuration efficiency.Comparatively speaking, the advantage of a uniqueness of the invention is not only
Serve water saving, improve the purpose of desulfuration efficiency, also provide the user required thermal source.
Former flue reduces construction costs without anti-corrosion before the absorption tower entrance of the present invention, also shortens and builds
If the duration.Using before the entrance of absorption tower plus the technique of heat exchanger is to be reduced to former flue gas by 130 DEG C or so
80～90 DEG C, the flue so between heat exchanger exit and absorption tower entrance is accomplished by carrying out preservative treatment,
This technique absorption tower gas approach is constant, still falls within high-temperature flue, so preservative treatment need not be made, so
The cost that just reduces, shorten the duration.
Presently preferred embodiments of the present invention is the foregoing is only, it is all in the present invention not to limit the present invention
Spirit and principle within, any modification, equivalent substitution and improvements made etc. should be included in this
Within bright protection domain.
Claims (8)
1. a kind of recuperation of heat water-saving system of wet desulphurization, including absorption tower (1), its feature exists
In：Also include n platform circulating pumps (2), a fortune one for slurry feeding pump (3), heat exchanger
(4), heat pump (5), n-layer spraying layer (6), a fortune one are for water pump (7), n >=1；
Wherein,
Pipeline is connected between absorption tower (1) and circulating pump (2) import and export, circulating pump (2) import cloth
Valve eight (8) is put, pipeline is connected between absorption tower (1) and slurry feeding pump (3), and arrangement of valves
Door nine (9)；Slurry feeding pump (3) outlet is connected with pipeline between heat exchanger (4), and arranges
Valve ten one (11)；Pipeline is connected between heat exchanger (4) serum outlet and absorption tower (1), and
Arrangement valve ten (10) and valve ten two (12)；Pipeline between heat exchanger (4) and water pump (7)
Connection, and arranges valve ten three (13), and heat pump (5) is connected by carbon steel piping again between heat exchanger,
And valve ten four (14) is arranged, pipeline is connected between water pump (7) and heat pump (5), and arrangement of valves
Men Shiwu (15)；The system constitutes three circulations：First circulation：Absorption tower (1)-slurry
Liquid delivery pump (3)-heat exchanger (4)-absorption tower (1)；Second circulation：Absorption tower (1)-
Circulating pump (2)-spraying layer (6)-absorption tower (1)；3rd circulation：Heat exchanger (4)-
Water pump (7)-heat pump (5)-heat exchanger (4).
2. the recuperation of heat water-saving system of wet desulphurization according to claim 1, it is characterised in that：
Circulating pump (2) quantity is determined by the requirement of former sulfur removal technology.
3. the recuperation of heat water saving art of a kind of wet desulphurization, it is characterised in that：Comprise the following steps:
The first step：The slurry feeding pump (3) arranged by absorption tower (1), by high temperature serosity in tower
Heat exchanger (4) is squeezed into, the serosity after heat exchanger exchanges heat, temperature reduces entering back in tower, this
Sample allows for the serosity in tower and becomes low temperature serosity；
Second step：Low temperature serosity is squeezed into the spraying layer (6) on absorption tower, low temperature by circulating pump (2)
Serosity and the high temperature original smoke contacts for entering absorption tower, carry out heat exchange and SO2Absorption process, this
Sample had not only reached the purpose of desulfurization but also had reduced evaporation of water；
3rd step：Water Jing water pumps (7) for exchanging heat out through heat exchanger squeezes into heat pump (5), Ran Houyou
Heat pump (5) produces hot water or low-pressure steam, for users to use；Water after being cooled down by heat pump (5) is returned
Heat exchange again is carried out to heat exchanger.
4. the recuperation of heat water saving art of wet desulphurization according to claim 3, it is characterised in that：
The temperature of the high temperature serosity is 38-50 DEG C.
5. the recuperation of heat water saving art of wet desulphurization according to claim 3, it is characterised in that：
The temperature of the low temperature serosity is 30-34 DEG C.
6. the recuperation of heat water saving art of wet desulphurization according to claim 3, it is characterised in that：
The coolant-temperature gage for exchanging heat out through heat exchanger is 25-28 DEG C.
7. the recuperation of heat water saving art of wet desulphurization according to claim 3, it is characterised in that：
The temperature of the low-pressure steam is 100-120 DEG C.
8. the recuperation of heat water saving art of wet desulphurization according to claim 3, it is characterised in that：
Coolant-temperature gage after the cooling by heat pump (5) is 18-20 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310718023.1A CN103691260B (en) | 2013-12-23 | 2013-12-23 | Heat recovery water-saving system for desulfuration by wet process and process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310718023.1A CN103691260B (en) | 2013-12-23 | 2013-12-23 | Heat recovery water-saving system for desulfuration by wet process and process thereof |
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| CN103691260A CN103691260A (en) | 2014-04-02 |
| CN103691260B true CN103691260B (en) | 2017-04-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107684817A (en) * | 2016-08-03 | 2018-02-13 | 天津华赛尔传热设备有限公司 | A kind of flue gas desulfurization process system |
| CN108654353A (en) * | 2017-04-01 | 2018-10-16 | 天津华赛尔传热设备有限公司 | A kind of smoke processing system and method |
| CN107120714B (en) * | 2017-05-18 | 2019-08-09 | 大连理工大学 | A kind of whole yearization comprehensive utilization energy conserving system |
| CN107178814A (en) * | 2017-05-18 | 2017-09-19 | 大连理工大学 | A kind of thermal power plant boiler fume afterheat is used for the energy conserving system of central heating |
| CN108106450B (en) * | 2017-07-10 | 2023-03-10 | 昊姆（上海）节能科技有限公司 | Annual operating dual-working-condition flue gas treatment system |
| CN107655021A (en) * | 2017-10-31 | 2018-02-02 | 中国华能集团清洁能源技术研究院有限公司 | A kind of method and system using absorption heat pump Mist heat recovering |
| CN108159868B (en) * | 2018-03-15 | 2024-04-26 | 烟台龙源电力技术股份有限公司 | Desulfurization waste water and chimney white smoke plume cooperative treatment system |
| CN108554139A (en) * | 2018-03-17 | 2018-09-21 | 北京中能诺泰节能环保技术有限责任公司 | Flue gas processing device and wet desulfurization system |
| CN108392974B (en) * | 2018-05-03 | 2024-05-14 | 烟台龙源电力技术股份有限公司 | System for reducing emission of white smoke plume water vapor of thermal power plant |
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| JPS56126430A (en) * | 1980-03-07 | 1981-10-03 | Kawasaki Heavy Ind Ltd | Wet type stack gas desulfurization method |
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|---|---|---|---|---|
| CN201940150U (en) * | 2010-10-14 | 2011-08-24 | 中国石油化工股份有限公司 | Oil and gas absorption system capable of improving recovery rate |
| CN203253350U (en) * | 2013-05-11 | 2013-10-30 | 山东中玻节能环保发展有限公司 | Renewable organic amine circulating desulfurization purifying tower |
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