CN102644913B - Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof - Google Patents
Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof Download PDFInfo
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- CN102644913B CN102644913B CN201210125397.8A CN201210125397A CN102644913B CN 102644913 B CN102644913 B CN 102644913B CN 201210125397 A CN201210125397 A CN 201210125397A CN 102644913 B CN102644913 B CN 102644913B
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Abstract
The invention discloses a residual heat utilization method of cooling water for a black liquor recovery boiler chute and a system of the residual heat utilization method of cooling water for black liquor recovery boiler chute. According to the invention, the black liquor recovery boiler chute is subjected to cool when desalting cooling water passes through the alkali recovery boiler chute, then the conductivity of the desalting cooling water after heat exchange is detected; when the conductivity of the desalting cooling water after heat exchange is not larger than a set value, the desalting cooling water after heat exchange is transmitted to a boiler so as to supplement preheating water for the boiler; when the conductivity of the desalting cooling water after heat exchange is larger than the set value, the desalting cooling water after heat exchange is recycled or treated and discharged. The method and the system provided by the invention have the advantages that no cooling heat exchanger for circulating cooling water is used and the residual heat of the cooling water after heat exchange is well used; therefore, the method is simple in flow, the system equipment is simple, small space is occupied, the investment is low, and the operating cost is low; moreover, the method and the system are easy to control.
Description
Technical field
The invention belongs to pulping and paper-making industry alkali and reclaim furnace room alkali recovery boiler chute cooling water technology, be specifically related to a kind of alkali recovery boiler chute cooling water heat and utilize technology.
Background technology
Pulping and paper-making industry is that China's emphasis pollutes one of industry, main pollution sources by the black liquor producing in pulping process, current domestic and international application the most widely technology is alkali recycling technology, and wherein alkali recovery boiler occupy the core link of alkali recycling technology.After black liquor burns in alkali recovery boiler, discharge the melting ash of high temperature from furnace bottom, melting ash will be sent into dissolving tank by chute and recycle.The cooling of chute realized by water-cooled; Chute is one of key equipment of alkali recovery boiler, once chute damages, will be forced to blowing out and repair or replace.Fusant chute cooling medium generally adopts common clear water or demineralized water (demineralized water) at present.It is cooling that most domestic pulp mill generally adopts common clear water to carry out chute, mainly because clear water convenient sources, but because clear hardness of water is higher, after long-term use, can cause the fouling of chute inner surface, affect cooling effect, easily cause chute to damage, even have part factory that the clear water after using is directly drained, both wasted water resource and also wasted heat energy.External and domestic newly-built pulp mill generally adopts the chute cooling technology in " recommend method of alkali recovery boiler black liquor safe combustion " (RECOMMENDED GOOD PRACTICE SAFE FIRING OF BLACK LIQUOR IN BLACK LIQUOR RECOVERY BOILERS) that North America " alkali recovery boiler Advisory Board " (THE BLACK LIQUOR RECOVERY BOILER ADVISORY COMMITTEE) formulates, this technology is to be closed cycle by the design of cooling water of chute, adopt demineralized water as cooling medium, comprise water circulating pump, elevated tank, recirculated cooling water cooling heat exchanger, cyclic water tank, automatic instrument(s) and valve etc., first its method is utilized between the cooling water of desalination and chute and is carried out heat exchange, this system lock is good, safe and reliable, also non flouling behaviour of long-term operation chute inner surface.This system is implemented cooling method to chute: the cooling water of the hot desalination after heat exchange is undertaken cooling again by recirculated cooling water cooling heat exchanger, then recycles.There is system complex in this system, it is high to invest, operating cost is high, the unserviceable shortcoming of waste heat, and this system exists and can easily not detect the whether problem of seepage of chute simultaneously.
Summary of the invention
The object of the present invention is to provide a kind ofly without recirculated cooling water cooling heat exchanger, the heat energy of realizing in the cooling water of desalination recycles, and the alkali recovery boiler chute cooling water heat whether chute leaks examinations is utilized to method and system thereof; To address the above problem.
Alkali recovery boiler chute cooling water heat of the present invention utilizes method: be by desalination cooling water implement through alkali recovery boiler chute cooling to chute after, detect the cooling electrical conductivity of water of desalination after heat exchange; When the cooling electrical conductivity of water of desalination after heat exchange is not more than setting value, the desalination cooling water after described heat exchange is transported to boiler, boiler is supplemented to preheating water; When the cooling electrical conductivity of water of desalination after heat exchange is greater than setting value, the desalination cooling water after described heat exchange is reclaimed or is administered discharge.
The water temperature of desalination cooling water is not more than 30 DEG C; The water temperature of the desalination cooling water after heat exchange is not more than 60 DEG C.
The water temperature control of the desalination cooling water after heat exchange realizes by controlling discharge.
Alkali recovery boiler chute cooling water afterheat utilization system of the present invention, it comprises alkali recovery boiler water-cooling sliding chute, the cooling water inlet pipe of water-cooling sliding chute connects UNICOM's desalination cooling water supply pipe, the outlet pipe of water-cooling sliding chute connects UNICOM's water pump, outlet conduit first outlet conduit in parallel of water pump and for boiler being supplemented to the second outlet conduit of preheating water; The outlet conduit of water pump is provided with the conductance instrument for detection of the desalination cooling water electrical conductivity after heat exchange; The output signal of conductance instrument is transported to logic controller, and the output control signal of logic controller is transported to respectively the first control valve on the first outlet conduit and the second control valve of the second outlet conduit.
Desalination cooling water supply pipe is provided with flow control valve and the first stop valve.
On desalination cooling water supply pipe, establish water inlet water temperature detector; The outlet pipe upper water-out water temperature detector of the heat-exchange device of alkali recovery boiler chute.
On the pipeline of the water inlet end of the first control valve, be connected with the second stop valve; On the pipeline of the water inlet end of the second control valve, be connected with the 3rd stop valve.
The setting value of desalination cooling water electrical conductivity refers to that meeting boiler uses electrical conductivity of water; National standard has regulation, has different control criterions according to the difference of boiler pressure.
The invention solves the technical problem that the waste heat of chute fouling and cooling chute cannot be recycled, have the following advantages and improve than other technical scheme:
1. adopt demineralized water cooling chute, avoid the problem of chute inner surface fouling, improve the cooling effect of chute, extend chute service life.
2. carry out gauge tap valve by conductance instrument on-line measurement cooling water conductivity values and select the cooling water whereabouts after heat exchange, if electrical conductivity is qualified, cooling water is sent to boiler feed water system, can makes full use of like this waste heat, reduce boiler feedwater preheating steam consumption quantity; If electrical conductivity exceeds standard, illustrate chute have leak or cooling water quality defective, can operate operation to the operations staff of factory reference data is provided.
3, because this system does not have recirculated cooling water cooling heat exchanger, make full use of the waste heat of the cooling water after heat exchange, therefore, the method flow process is simple simultaneously, and system equipment is simple, take up room little, and small investment, operating cost is low; Be easy to control simultaneously.
Brief description of the drawings
Fig. 1 alkali recovery boiler chute cooling water afterheat utilization system schematic diagram.
Fig. 2 logic controller principle schematic.
Detailed description of the invention
As shown in Figure 1, alkali recovery boiler chute 5, it is a kind of non-direct contact type cooling device, and a passage flowing through for high-temp liquid can be provided, to prevent that high-temp liquid from burning out equipment itself, be routine techniques.The cooling water inlet pipe of alkali recovery boiler chute 5 connects UNICOM's desalination cooling water supply pipe 1, and desalination cooling water supply pipe 1 is provided with into water water temperature detector 2, and water inlet water temperature detector 2 is platinum resistance thermometer sensor; Desalination cooling water supply pipe 1 and desalination cooling water water source UNICOM.Desalination cooling water water source can be water tank.Desalination cooling water supply pipe 1 is provided with flow control valve 3 and stop valve 4.The cooling water outlet pipe of alkali recovery boiler chute 5 is provided with output water temperature detector 6 and pressure measuring instruments 7.Output water temperature detector 6 is platinum resistance thermometer sensor.
The cooling water outlet pipe of alkali recovery boiler chute 5 is connected UNICOM with water pump 8.Water pump 8 adopts in parallel two, and one is work water pump, and another is reserve pump.Water pump 8 outlet conduits 15 the first outlet conduit 16 in parallel and for boiler being supplemented to the second outlet conduit 17 of preheating water; The outlet pipe 15 of water pump 8 is provided with the conductance instrument 9 for detection of the desalination cooling water electrical conductivity after heat exchange;
The first outlet conduit 16 is provided with the first control valve 13 and the second stop valve 18; The first outlet conduit 16 passes through after the second stop valve 18 and the first control valve 13, reclaims or administer discharge 14 UNICOMs with desalination cooling water.
The second outlet conduit 17 is provided with the second control valve 11 and the 3rd stop valve 19; The second outlet conduit 17 is by the 3rd stop valve 19 and the second control valve 11 and boiler feedwater pipeline 12 UNICOMs.
Conductance instrument 9 is conventional commodity.The output signal of conductance instrument is transported to logic controller 10, and the output control signal of logic controller 10 is transported to respectively the first control valve 13 on the first outlet conduit and the second control valve 11 of the second outlet conduit.
Original state before system operation is as follows: control valve 3 standard-sized sheets, stop valve 4 are opened, stop valve 18 is opened, stop valve 19 is opened, water pump 8 starts, the first control valve 13 is opened, the second control valve 11 is closed, logic controller 10 is closed.In use, chute cooling water enters whole system from desalination water source by desalination cooling water supply pipe 1, water inlet water temperature detector 2 is measured cooling water temperature and is not more than 30 DEG C, then the aperture of control valve 3 is slowly turned down, stop regulating control valve 3 when the measurement numerical value of output water temperature detector 6 is not more than 60 DEG C; Desalination cooling water is implemented cooling to alkali recovery boiler chute;
Online conductance instrument 9 detects the cooling electrical conductivity of water of desalination after heat exchange; When the cooling electrical conductivity of water of desalination after heat exchange is not more than setting value, enable logic controller 10 controls that the second control valve 11 is opened, the first control valve 13 is closed, desalination cooling water after heat exchange is transported to boiler, and boiler is supplemented to preheating water, and system enters normal operating condition.In running, online conductance instrument 9 detects while occurring being greater than setting value by the cooling electrical conductivity of water of desalination after chute, system there will be warning, logic controller 10 can be closed by automatic switchover control the second control valve 11 simultaneously, the first control valve 13 is opened (as shown in Figure 2), cooling water is sent to plant water (sewage) 14, the operations staff of factory will analyze in time and cause that online electrical conductivity measurement instrument 9 measures the reason that numerical value exceeds standard according to alarm signal prompting, if because desalination water source is defective, notifies and carry out adjust operation between batch production waterwheel; Cause exceeding standard if chute occurs to leak, chute maintenance and replacing are carried out in blowing out in time.
Logic controller 10 is conventional products.
Claims (3)
1. an alkali recovery boiler chute cooling water afterheat utilization system, it comprises the cooling chute of alkali recovery boiler, the cooling water inlet pipe UNICOM desalination cooling water supply pipe of cooling chute, it is characterized in that the outlet pipe UNICOM water pump of cooling chute, the outlet conduit of water pump the first outlet conduit in parallel and for boiler being supplemented to the second outlet conduit of preheating water; The outlet conduit of water pump is provided with the conductance instrument for detection of the desalination cooling water electrical conductivity after heat exchange; The output signal of conductance instrument is transported to logic controller, and the output control signal of logic controller is transported to respectively the first control valve on the first outlet conduit and the second control valve of the second outlet conduit; Desalination cooling water supply pipe is provided with flow control valve and the first stop valve.
2. alkali recovery boiler chute cooling water afterheat utilization system as claimed in claim 1, is characterized in that establishing on desalination cooling water supply pipe water inlet water temperature detector; On the outlet pipe of the heat-exchange device of alkali recovery boiler chute, establish output water temperature detector.
3. alkali recovery boiler chute cooling water afterheat utilization system as claimed in claim 1, is characterized in that being connected with the second stop valve on the pipeline of water inlet end of the first control valve; On the pipeline of the water inlet end of the second control valve, be connected with the 3rd stop valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125397.8A CN102644913B (en) | 2012-04-25 | 2012-04-25 | Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125397.8A CN102644913B (en) | 2012-04-25 | 2012-04-25 | Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102644913A CN102644913A (en) | 2012-08-22 |
| CN102644913B true CN102644913B (en) | 2014-08-20 |
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| CN201210125397.8A Active CN102644913B (en) | 2012-04-25 | 2012-04-25 | Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0539914A (en) * | 1991-08-02 | 1993-02-19 | Mitsubishi Heavy Ind Ltd | Soda recovery boiler |
| FI115143B (en) * | 1999-09-10 | 2005-03-15 | Kvaerner Power Oy | Arrangement in a soda pan |
| CN201795687U (en) * | 2009-12-22 | 2011-04-13 | 杭州锦江集团有限公司 | System for recycling alumina heat of roaster fluidized bed |
| CN202012018U (en) * | 2011-01-24 | 2011-10-19 | 云南云景林纸股份有限公司 | High-efficiency cooling fusant chute |
| CN102230292B (en) * | 2011-06-23 | 2013-05-01 | 中国轻工业武汉设计工程有限责任公司 | Circulation cooling device for chute of soda recovery furnace |
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Effective date of registration: 20170606 Address after: At the junction of two road and 430000 Industrial District Ho Lake Street in Hubei province Wuhan city Jiangxia District Bridge Patentee after: Wuhan Wu pan Energy Engineering Co., Ltd. Address before: 430070 Hubei Province, Wuhan city Wuchang District Wuluo Road No. 586 Patentee before: Wuhan Engineering Technology Co.,Ltd,Wuhan Boiler Group. |
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