CN104880123A - Method for treating ash deposition and scaling of GGH (gas-gas heater) - Google Patents
Method for treating ash deposition and scaling of GGH (gas-gas heater) Download PDFInfo
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- CN104880123A CN104880123A CN201510193749.7A CN201510193749A CN104880123A CN 104880123 A CN104880123 A CN 104880123A CN 201510193749 A CN201510193749 A CN 201510193749A CN 104880123 A CN104880123 A CN 104880123A
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- ggh
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Abstract
The invention discloses a method for treating ash deposition and scaling of a GGH (gas-gas heater). The method for treating ash deposition and scaling of the GGH has the advantages that the steps of blowing ash online by compressed air, flushing online by high-pressure water, flushing by low-pressure water before halting and performing high-pressure flushing by chemical cleaners after halting are adopted, so that the problems of severe ash deposition and scaling of a heated surface of the GGH due to ash deposition, acid coagulation, liquid drop adhesion and the like are solved, blockage resulting from ash deposition and scaling of the GGH is slowed down substantially, normal operation and flue gas desulfurization effect of a desulfurization system are guaranteed, halting times of the desulfurization system are decreased, and safety operation and safety economy of a unit are guaranteed under a rated condition.
Description
Technical field
The present invention relates to flue gas heat-exchange unit field, refer to a kind of method of smoke treatment heat exchanger GGH ash deposit and slag buildup especially.
Background technology
In desulphurization system (FGD), the Low Temperature Wet flue gas corrosion flue of discharging for avoiding absorption tower and inner wall of stack, the rising height simultaneously improving chimney discharge flue gas is beneficial to Pollutants Diffusion, avoids smoke evacuation landing drop, standing flue gas heat-exchange unit (GGH) device.In smoke re-heater rotor, heat transfer element is arranged closely in basket framework, and heat transfer element has certain circulation passage, and former flue gas and neat stress pass through from the circulation road of heat transfer element.When rotor turns is to former fume side, heat transfer element absorbs the heat of former flue gas, when rotor rotates to neat stress side, heat transfer element release heat, and heat neat stress, undesulfured former flue gas (being generally 130-150 DEG C) is gone to heat the neat stress of desulfurization with it, generally be heated to about 80 DEG C, then discharge, to avoid Low Temperature Wet flue gas corrosion flue, inner wall of stack, and can atmosphere hoist height be improved.The GGH put into operation at present is in operation, and all to run into ash deposit and slag buildup serious, cause the abnormal situation about increasing of whole air and flue system resistance, FGD forced outage time serious, this causes extra burden to undoubtedly the operation of whole FGD, therefore guarantee that GGH is stable, ash deposit and slag buildup does not result in blockage, and runs most important to whole FGD.
The analysis of causes of flue gas heat-exchange unit ash deposit and slag buildup:
(1) dust content exceeds standard: former, neat stress is all by GGH hot junction, and because absorption tower exiting flue gas carries a certain amount of moisture, GGH hot junction heat exchange element surface ratio is moister, and in flue gas, dust can stick to the surface of heating element heater.Along with the accumulation of running time is hardened, can cause blockage problem, when fume amount is large, blocking is faster.
(2) demister weak effect: the demister in exit, absorption tower except fog effect bad, or demister element has gypsum to deposit to make channel narrows, cause saturated wet flue gas to carry calcium plaster.When this flue gas enters the clean flue of GGH, moisture is by heating evaporation (additionally consuming heat), and namely soot particle remains on heat exchange element and form contamination.
(3) GGH purges or rinses abnormal: GGH purge and flushing device fault rate high, spray nozzle clogging, flushing pressure and the flushing frequency are unreasonable etc. all can not remove dust stratification, dust stratification and form cumulative thickness increase in time, finally results in blockage.
(4) reason of other side: when pH value is higher in absorption tower, the CaSO that flue gas carries
2content is also many, SO in they and former, neat stress
2continue reaction generate crystal gypsum and stick to securely on GGH heat exchange element and cause blocking.The SiO when limestone-impurities is many, in fire coal
2when content increases, on liquid level, often can produce a large amount of foam when absorption tower is run, in foam, carry lime stone and gypsum mixtures particle.When level gauging does not reflect part false on liquid level, former smoke inlet blows back into GGH from absorption tower to cause foam, and when former flue gas is through GGH, foam is under former fume high-temperature effect, moisture content is evaporated, and the lime stone carried in foam and gypsum mixtures particle stick to heat exchanger fin surface.In the process, first the dust in former flue gas is attracted on foam, along with foam moisture content evaporation so that stick to heat exchanger fin surface, cause fouling.
Summary of the invention
Object of the present invention is exactly the situation for above-mentioned prior art, proposes a kind of method of smoke treatment heat exchanger GGH ash deposit and slag buildup, solves the serious ash deposit and slag buildup problem that GGH heating surface causes because of reasons such as dust stratification, acid cure knot, drop adhesions.
The object of the invention is to be achieved through the following technical solutions:
A method for smoke treatment heat exchanger GGH ash deposit and slag buildup, is characterized in that, comprise the following steps:
(1) line compression air blows ash: use the compressed air of 0.6-0.9MPa to carry out online blowing deposited dust to GGH, cleaning frequency be every 2-3 hour once;
(2) online high pressure water washing: stick thing to not removing by normal dry type of getting off of long term accumulation, uses 10-13MPa fire water of living to carry out online high pressure water washing;
(3) before shutting down, low-pressure water is rinsed: before GGH shuts down, and adopts 0.4-0.55MPa sulfur removal technology water low-pressure washing, washes away the loose acidic deposits that GGH rotor sticks;
(4) chemical high pressure washing after shutting down: carry out 40MPa high pressure water washing after GGH heat exchanger fin alkalescent chemical is soaked.
Described alkalescent chemical is one or more combinations in CHT-2013 type GGH alkaline cleaner, GS-QS01 type GGH enamel original paper cleaning agent, GS-QS02 type GGH enamel original paper cleaning agent.
The invention has the beneficial effects as follows: significantly slow down the blocking of GGH ash deposit and slag buildup, ensure that normal operation and the flue gas desulfurization effect of desulphurization system, reduce desulphurization system stoppage in transit number of times, guarantee the safe operation of unit under declared working condition and the safety and economic benefit of unit.
Accompanying drawing explanation
Detailed description of the invention
Embodiment 1
A method for smoke treatment heat exchanger GGH ash deposit and slag buildup, comprises the following steps:
(1) line compression air blows ash: use the compressed air of 0.6MPa to carry out online blowing deposited dust to GGH, cleaning frequency be every 2 hours once;
(2) online high pressure water washing: stick thing to not removing by normal dry type of getting off of long term accumulation, uses 10MPa fire water of living to carry out online high pressure water washing;
(3) before shutting down, low-pressure water is rinsed: before GGH shuts down, and adopts 0.4MPa sulfur removal technology water low-pressure washing, washes away the loose acidic deposits that GGH rotor sticks;
(4) chemical high pressure washing after shutting down: carry out 40MPa high pressure water washing after GGH heat exchanger fin CHT-2013 type GGH alkaline cleaner is soaked.
Embodiment 2
A method for smoke treatment heat exchanger GGH ash deposit and slag buildup, comprises the following steps:
(1) line compression air blows ash: use the compressed air of 0.9MPa to carry out online blowing deposited dust to GGH, cleaning frequency be every 3 hours once;
(2) online high pressure water washing: stick thing to not removing by normal dry type of getting off of long term accumulation, uses 13MPa fire water of living to carry out online high pressure water washing;
(3) before shutting down, low-pressure water is rinsed: before GGH shuts down, and adopts 0.55MPa sulfur removal technology water low-pressure washing, washes away the loose acidic deposits that GGH rotor sticks;
(4) chemical high pressure washing after shutting down: carry out 40MPa high pressure water washing after GGH heat exchanger fin GS-QS01 type GGH enamel original paper cleaning agent and GS-QS02 type GGH enamel original paper cleaning agent are soaked.
The above is preferred embodiment of the present invention.
Claims (2)
1. a method for smoke treatment heat exchanger GGH ash deposit and slag buildup, is characterized in that, comprise the following steps:
(1) line compression air blows ash: use the compressed air of 0.6-0.9MPa to carry out online blowing deposited dust to GGH, cleaning frequency be every 2-3 hour once;
(2) online high pressure water washing: stick thing to not removing by normal dry type of getting off of long term accumulation, uses 10-13MPa fire water of living to carry out online high pressure water washing;
(3) before shutting down, low-pressure water is rinsed: before GGH shuts down, and adopts 0.4-0.55MPa sulfur removal technology water low-pressure washing, washes away the loose acidic deposits that GGH rotor sticks;
(4) chemical high pressure washing after shutting down: carry out 40MPa high pressure water washing after GGH heat exchanger fin alkalescent chemical is soaked.
2. the method for a kind of smoke treatment heat exchanger GGH ash deposit and slag buildup according to claim 1, is characterized in that described alkalescent chemical is one or more combinations in CHT-2013 type GGH alkaline cleaner, GS-QS01 type GGH enamel original paper cleaning agent, GS-QS02 type GGH enamel original paper cleaning agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510193749.7A CN104880123A (en) | 2015-04-22 | 2015-04-22 | Method for treating ash deposition and scaling of GGH (gas-gas heater) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510193749.7A CN104880123A (en) | 2015-04-22 | 2015-04-22 | Method for treating ash deposition and scaling of GGH (gas-gas heater) |
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| CN104880123A true CN104880123A (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510193749.7A Pending CN104880123A (en) | 2015-04-22 | 2015-04-22 | Method for treating ash deposition and scaling of GGH (gas-gas heater) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109758880A (en) * | 2019-02-21 | 2019-05-17 | 山西日盛达新能源集团有限公司 | A kind of desulphurization denitration flue gas with neat stress cooling and dehumidifying function takes off white device |
| CN112923392A (en) * | 2021-03-19 | 2021-06-08 | 苏州西热节能环保技术有限公司 | Method for removing hardened ash scale of boiler air preheater |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08327294A (en) * | 1995-05-30 | 1996-12-13 | Ishikawajima Harima Heavy Ind Co Ltd | Washing apparatus for gas gas heater |
| CN102002721A (en) * | 2010-11-18 | 2011-04-06 | 华北电力大学（保定） | Cleaning agent for cleaning gas/gas heat exchanger of wet desulphurization system and preparing and using method thereof |
| CN102296008A (en) * | 2011-07-26 | 2011-12-28 | 西安热工研究院有限公司 | Neutral cleaning agent for cleaning scaling substances on GGH (gas-gas heater) of flue gas desulphurization system |
| CN103242986A (en) * | 2013-04-16 | 2013-08-14 | 太仓市宝马环境工程有限公司 | Calcium sulfate scale cleaning agent and preparation method thereof |
| CN204142064U (en) * | 2014-09-26 | 2015-02-04 | 中国神华能源股份有限公司 | A kind of flue gas heat-exchange unit |
-
2015
- 2015-04-22 CN CN201510193749.7A patent/CN104880123A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08327294A (en) * | 1995-05-30 | 1996-12-13 | Ishikawajima Harima Heavy Ind Co Ltd | Washing apparatus for gas gas heater |
| CN102002721A (en) * | 2010-11-18 | 2011-04-06 | 华北电力大学（保定） | Cleaning agent for cleaning gas/gas heat exchanger of wet desulphurization system and preparing and using method thereof |
| CN102296008A (en) * | 2011-07-26 | 2011-12-28 | 西安热工研究院有限公司 | Neutral cleaning agent for cleaning scaling substances on GGH (gas-gas heater) of flue gas desulphurization system |
| CN103242986A (en) * | 2013-04-16 | 2013-08-14 | 太仓市宝马环境工程有限公司 | Calcium sulfate scale cleaning agent and preparation method thereof |
| CN204142064U (en) * | 2014-09-26 | 2015-02-04 | 中国神华能源股份有限公司 | A kind of flue gas heat-exchange unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109758880A (en) * | 2019-02-21 | 2019-05-17 | 山西日盛达新能源集团有限公司 | A kind of desulphurization denitration flue gas with neat stress cooling and dehumidifying function takes off white device |
| CN112923392A (en) * | 2021-03-19 | 2021-06-08 | 苏州西热节能环保技术有限公司 | Method for removing hardened ash scale of boiler air preheater |
| CN112923392B (en) * | 2021-03-19 | 2022-05-17 | 苏州西热节能环保技术有限公司 | Method for removing hardened ash scale of boiler air preheater |
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Application publication date: 20150902 |
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