CN1068972A - Flue gas purifying method that can save energy and device - Google Patents
Flue gas purifying method that can save energy and device Download PDFInfo
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- CN1068972A CN1068972A CN 91105124 CN91105124A CN1068972A CN 1068972 A CN1068972 A CN 1068972A CN 91105124 CN91105124 CN 91105124 CN 91105124 A CN91105124 A CN 91105124A CN 1068972 A CN1068972 A CN 1068972A
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Abstract
Process for dusting and dsulfurizing fume and isolated plant thereof that a kind of mechanical induced draft boiler can save energy.It is characterized in that wet type (secondary) dedusting and chemical desulfurization carry out synchronously; Regulate the cigarette resistance with stable operating fluid level simultaneously, the control boiler burns at micro-vacuum state; Flue gas low latitude discharging through fully purifying does not re-use chimney.Total dust removal efficiency can reach more than 96%, and desulfurization degree can reach more than 93%, can improve boiler thermal output more than 6%.
Description
The present invention relates to process for dusting and dsulfurizing fume and isolated plant thereof that a kind of mechanical induced draft boiler can save energy.
Existing general 2
T-10
TCoal and oil boiler (containing heating and Industrial Boiler) is in design theory and actual motion, (select from Tongji University's teaching material " boiler and boiler room equipment " in July, 1986 second edition) as shown in Figure 1, flue gas is only handled (6) through simple dry dust removal, and micronic dust and pernicious gas pass through chimney (8) directly to high altitude discharge through air-introduced machine (7).Ubiquitous weak point is:
1. can't handle trickle grit, cyclone dust collector dust removal efficiency commonly used only reaches 85%
2. pernicious gas sulfur dioxide, nitrogen oxide do not deal with, and let alone to spread in atmosphere
3. be the influence that overcomes the resistance and the air pressure wind direction of flue chimney, burner hearth must keep high negative pressure, and part fuel gas and material are discharged with excess air, and can not get abundant burning.
The present invention is intended to break industry prejudice, and existing boiler exhaust gas exhaust system is carried out the essence transformation, provides a kind of total dust removal efficiency can reach more than 96%, and desulfurization degree can reach more than 93%, can improve method and the isolated plant thereof of the thermal efficiency more than 6% simultaneously.
The process for dusting and dsulfurizing fume that the present invention's machinery induced draft boiler can save energy is characterized in that:
A. wet dust removal (final dusting) is carried out synchronously with chemical desulfurization, by original air-introduced machine flue gas is introduced isolated plant of the present invention, the aeration spray allows flue gas fully contact (pH value 8-15 with alkaline absorption solution under normal pressure, temperature 50-60 ℃, allow to contain salts substances such as sodium, potassium, iron, magnesium, aluminium, silicon, calcium in the solution), the gas-liquid two-phase is stirred, the suspension grit is by the heavy collection of gravity, pernicious gas generation chemical reactions such as sulfur dioxide, the sulphite that generates etc. reside in the absorption liquid blowdown or discharge together together with laying dust when changing liquid.Alkaline absorption solution comprises sodium hydroxide solution, niter buck liquid, also can utilize the boiler alkaline discharge water, and Na-ion exchanger recoil water waters and soaks slag and separate out water, paper waste, waste water from washing wool etc.
B. dust-removal and desulfurizing the time, regulate the cigarette resistance, adopt the control of supplying water of overflow control or variable pump with stable operating fluid level, keep the fixed liquid level water level of weighing apparatus, blast to weigh the hydraulic balance air-introduced machine fixed guarantees that boiler burns at micro-vacuum state, reduces coefficient of excess air and incomplete combustion loss;
C. the flue gas through fully purifying meets or exceeds environmental requirement, carries out the low latitude discharging, does not re-use chimney.
The present invention realizes that the isolated plant of preceding method is the center with the voltage stabilizing cleaning system, on repeatedly kick into wind system, run in down dirty system and smoke evacuation system guarantee the package unit optimum Working by monitoring system, its formation comprises:
A. air inlet system is made up of air-introduced machine exhaust outlet air inlet pipe, deep bead, smoke box, tube sheet, some aeration tubes.Its role is to introduce flue gas, reduce flow velocity and balancedly import the voltage stabilizing cleaning system by original air-introduced machine.
B. the voltage stabilizing cleaning system is made up of aeration tank, circulating pump, circulation water ring, spray water ring, magnetic valve, cooling water ring, regulating tank, adjustable overflow pipe and is its role is to make flue gas to spray through the alkaline absorption solution aeration, carry out sufficient gas-liquid mass transfer exchange, realize dedusting and desulfurization, guarantee the operating fluid level that weighing apparatus is fixed simultaneously.
C. drainage is made up of cone storage hopper, dredge pump, blowdown non-return pipe.When alkaline working solution trend is neutral, open dredge pump, dust stratification is drained into sedimentation basin or device for separating mud and water simultaneously together with waste liquid.
D. exhaust system is made up of horizontal flue and vertical heating flue.Have phegma to return aeration tank in the horizontal flue, vertical heating flue establishes water fender in case flue gas with water.The air draft mouth of pipe is established the exhaust blower of banking up a fire.When boiler was banked up a fire, main induced draft fan quit work, and the row's of banking up a fire envelope blower fan is opened, and guarantees certain throughput and unlikely cigarette; Spillway hole continuation overflow drops to jar liquid and banks up a fire a little on the overflow pipe, guarantees also discharging after treatment of faint flue gas under the state of banking up a fire.
E. monitoring system is made up of pH value detector, temperature controller, 3 liquid level gauges, 2 liquid level gauges, alkali lye holder, alkali pumps.Its role is to realize pH value control in the complete unit, temperature control, liquid level water level control.Control mode can adopt Artificial Control, simple and mechanical control, single board computer control, microcomputer control.
The present invention compared with prior art has following advantage:
1, the collection dedusting, desulfurization, energy-conservation three big functions have been simplified the method for operation in one, and wherein dedusting and desulfuration efficiency are higher than domestic like product, and remarkable energy saving effect is unusual especially.
2. can utilize multiple industrial alkaline waste liquor, receive the effect of the treatment of wastes with processes of wastes against one another.
3. do not change original boiler body facility, only, simple in the configuration of fume emission tail end.
4. the low latitude discharging is not only saved down expensive construction cost because of the cancellation chimney, and provides new approach for the intensive region of town house solves smoking problem.
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the process equipment flow chart of existing known technology
1. drums, 2. traveling-grate stokers, 3. steam superheaters, 4. economizers, 5. air preheaters, 6. dedusters, 7. air-introduced machines, 8. chimneys, 9. pressure fans, 10. feed pumps, 11. fortune coal belt conveyers, 12. coal bunkers, 13. grey cars among the figure
Fig. 2 is a technological process block-diagram of the present invention
Fig. 3 is a process equipment flow chart of the present invention
1. air-introduced machine exhaust outlet air inlet pipe, 2. deep beads, 3. smoke boxes, 4. tube sheets, 5. aeration tubes, 6. aeration tanks, 7. circulating pumps, 8. circulation water rings 9. spray water rings, 10. magnetic valves, 11. cooling water rings, 12. regulating tanks, 13. adjustable overflow pipe 14. cone storage hoppers 15. dredge pumps 16. blowdown non-return pipes 17. horizontal flues 18. vertical heating flues 19. water fenders 20., 25. 2 liquid level gauges of exhaust blower 21. 24. 3 liquid level gauges of spillway hole 22.PH value detector 23. temperature controllers, 26. alkali lye holders, 27. alkali pumps of banking up a fire among the figure
Overall craft equipment flowsheet of the present invention is as follows: boiler smoke imports this device through air-introduced machine exhaust outlet air inlet pipe (1), discharges with work alkali lye at the aeration pore through deep bead (2) smoke box (3) tube sheet (4) aeration tube (5) to contact; By circulating pump (7) circulation water ring (8) spray water ring (9) supply working solution in aeration tank (6); When aeration tank liquid temperature surpassed regulation numerical value, magnetic valve (10) was opened, and cooling water is by cooling water ring (11) spraying cooling; Regulating tank
(12) accept the working solution that overflow pipe (13) flows back to, keep aeration tank water level (hydraulic pressure value=air-introduced machine blast), though and transfer liquid and unlikely influence weighing apparatus is decided water level when guaranteeing blowdown and liquid feeding; Starting dredge pump (15) during blowdown effluxes heavy collection dust and sulphite in the cone storage hopper (14) by blowdown non-return pipe (16); Purify the back flue gas by the outer atmosphere that drains into of horizontal flue (17) vertical heating flue (18); For preventing flue gas with water, establish a plurality of water fenders (19) in the vertical heating flue when boiler is banked up a fire, start exhaust blower (29) overflow pipe (13) of banking up a fire and go up spillway hole (21) and continue overflow and jar liquid is reduced to bank up a fire a little; Working solution flows through pH value detector (22) measures pH value, flows through temperature controller (23) and measures the liquid temperature; 3 liquid level gauges (24) lower limit stops dredge pump (15) and starts mid point (operating point) termination of pumping that alkali pump (27) is supplemented to the interior alkali lye of alkali lye holder (26) 3 liquid level gauges (24) simultaneously; The point of going up that cooling water when filling regulating tank water level rises to 3 liquid level gauges (24) stops moisturizing, starts dredge pump (15) draining simultaneously and makes water level reduce to mid point to stop; Alkali lye liquid level in 2 liquid level gauges (25) control alkali lye holder.
Inventor's industry control sampling machine is tested on KZL4-13 type chain-grate boiler, and former boiler plant will not be changed except that chimney without exception, and flue gas imports this device by air-introduced machine exhaust outlet air inlet pipe.Original 18.5KW air-introduced machine air quantity 7000-14000M
3/ h, blast 300mm water column.Determine that according to above-mentioned fan parameter the working solution volume is 6m in this device aeration tank
3137 of aeration tube ∮ 50mm anti-corrosive steel tubes, every has 16 in ∮ 10mm hole.Circulating pump is selected ∮ 50mm ceramic pump for use.After this model machine operation, through formally detecting, the result is as follows:
A. before being unkitted apparatus of the present invention, after cyclone dust removal, 687.5 milligrams/mark of flue gas concentration rice
3, this numerical value surpasses 2.4 times of national standards.
After the present invention was installed, segmentation was measured: before the primary dust removing, and 2919.6 milligrams/mark of dust concentration rice
3, 523.73 milligrams/mark of dust concentration rice behind the primary dust removing
3, 98.765 milligrams/mark of dust concentration rice behind the two-stage dust removal
3, far below GB (200 milligrams/mark rice
3).Flue gas is transparent light clear look.
According to above-mentioned testing result, the actual efficiency of dust collection of one-level cyclone dust removal only is 76-82%, and behind outfit the present invention, total dust removal efficiency can reach 96.6%.
B. detecting desulfurization degree with Orsat flue gas analyzer, is 75.8 milligrams/mark rice before the desulfurization
3, reduce to 5.0 milligrams/mark rice after the desulfurization
3, average desulfurization degree is 93.4%.
C. under boiler was exerted oneself condition on an equal basis, behind employing the present invention, heat loss due to exhaust gas reduced to 5.8 by 6.6, and the gas heat loss reduces to 3.2 by 9.52, and the solid thermal loss reduces to 5.2 by 13.2, and the thermal efficiency brings up to 70% by 63.2%, and coal saving rate reaches 10%.
Microcomputer control model (by 1: 5 ratio that contracts) of the present invention has been realized automatic detection, control automatically, operation automatically.Adorn pure sulfur dioxide simulation boiler smoke with steel cylinder, with ∮ 50mm blower fan (blast 40mm water column, air quantity 3m
3/ h) simulation air-supply.Working solution is 4 ‰ NaOH solution.With ∮ 20mm water pump (hydraulic pressure 0.6kg, water yield 2m
4/ h) circulation.With glass-calomel electrode test ph value, in setting range, move.
Testing result (four orders of magnitude of sulfur dioxide inlet gas concentration are used the pararosaniline hydrochloride colorimetric method)
8.33ppm-99.82%
16.67ppm-98.84%
25.00ppm-99.29%
33.33ppm-99.33%
Desulfurization degree is all more than 98%.
Automatic control system is easy and simple to handle, and is safe and reliable.
Claims (2)
1, the process for dusting and dsulfurizing fume that can save energy of a kind of mechanical induced draft boiler is characterized in that:
A. wet dust removal (final dusting) is carried out synchronously with chemical desulfurization, by original air-introduced machine flue gas is introduced isolated plant of the present invention, the aeration spray allows flue gas fully contact (pH value 8-15 with alkaline absorption solution under normal pressure, temperature 50-60 ℃, allow to contain salts substances such as sodium, potassium, iron, magnesium, aluminium, silicon, calcium in the solution), the gas-liquid two-phase is stirred, the suspension grit is by the heavy collection of gravity, pernicious gas generation chemical reactions such as sulfur dioxide, the sulphite that generates etc. reside in the absorption liquid blowdown or discharge together together with laying dust when changing liquid;
B. dust-removal and desulfurizing the time, regulate the cigarette resistance, adopt the control of supplying water of overflow control or variable pump with stable operating fluid level, keep the fixed liquid level water level of weighing apparatus, blast to weigh the hydraulic balance air-introduced machine fixed guarantees that boiler burns at micro-vacuum state, reduces coefficient of excess air and incomplete combustion loss;
C. the flue gas through fully purifying meets or exceeds environmental requirement, carries out the low latitude discharging, does not re-use chimney.
2, the supporting energy-saving dust-removing desulfurating apparatus of a kind of mechanical induced draft boiler is the center with the voltage-stabilizing system, on repeatedly kick into wind system, run in down dirty system and smoke evacuation system guarantee the package unit optimum Working by monitoring system, its formation comprises:
A. some aeration tubes of air inlet system (1) air-introduced machine exhaust outlet air inlet pipe (2) deep bead (3) smoke box (4) tube sheet (5)
B. voltage stabilizing cleaning system (6) aeration tank (7) circulating pump (8) circulation water ring (9) spray water ring (10) magnetic valve (11) cools off the adjustable overflow pipe of water ring (12) regulating tank (13)
C. drainage (14) cone storage hopper (15) dredge pump (16) blowdown non-return pipe
D. exhaust system (17) horizontal flue (18) vertical heating flue (19) water fender (20) exhaust blower (21) spillway hole of banking up a fire
E. monitoring system (22) pH value detector (23) (24) three (25) two liquid level gauges of liquid level gauge of temperature controller (26) alkali lye holders (27) alkali pump
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105124 CN1068972A (en) | 1991-07-30 | 1991-07-30 | Flue gas purifying method that can save energy and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105124 CN1068972A (en) | 1991-07-30 | 1991-07-30 | Flue gas purifying method that can save energy and device |
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| Publication Number | Publication Date |
|---|---|
| CN1068972A true CN1068972A (en) | 1993-02-17 |
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ID=4906988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91105124 Pending CN1068972A (en) | 1991-07-30 | 1991-07-30 | Flue gas purifying method that can save energy and device |
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| CN (1) | CN1068972A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273235B (en) * | 2005-09-27 | 2011-07-06 | 达尔能源控股有限责任公司 | Method and system for heating of water based on hot gases |
| CN105387473A (en) * | 2015-12-15 | 2016-03-09 | 威海鲁源科技环保设备有限公司 | Purifying treatment system with flue gas combustion chamber |
| CN106237813A (en) * | 2016-08-30 | 2016-12-21 | 嘉善金亿精密铸件有限公司 | A kind of stable-pressure device |
-
1991
- 1991-07-30 CN CN 91105124 patent/CN1068972A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273235B (en) * | 2005-09-27 | 2011-07-06 | 达尔能源控股有限责任公司 | Method and system for heating of water based on hot gases |
| CN105387473A (en) * | 2015-12-15 | 2016-03-09 | 威海鲁源科技环保设备有限公司 | Purifying treatment system with flue gas combustion chamber |
| CN106237813A (en) * | 2016-08-30 | 2016-12-21 | 嘉善金亿精密铸件有限公司 | A kind of stable-pressure device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |