CN201909306U - Boiler coal economizer internal circulation protection device before ignition and steam supply - Google Patents
Boiler coal economizer internal circulation protection device before ignition and steam supply Download PDFInfo
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- CN201909306U CN201909306U CN2011200249213U CN201120024921U CN201909306U CN 201909306 U CN201909306 U CN 201909306U CN 2011200249213 U CN2011200249213 U CN 2011200249213U CN 201120024921 U CN201120024921 U CN 201120024921U CN 201909306 U CN201909306 U CN 201909306U
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Abstract
The utility model relates to a boiler coal economizer internal circulation protection device before ignition and steam supply, which is used for cooling a cast iron coal economizer in a period of ignition for temperature rise and pressure rise on an industrial boiler with the coal economizer before external steam supply. The boiler coal economizer internal circulation protection device comprises a boiler steam bag and the coal economizer, wherein a boiler water filter, a pump inlet valve, a high-temperature hot water circulation pump, a pump outlet valve, the coal economizer and a normally closed electromagnetic valve are sequentially connected with the upper part of the boiler steam bag or a collection box pollution discharge pipe, the water inlet end of the coal economizer is additionally connected with a water supply pump, and the water inlet end of the water supply pump is connected with a water supply pool. The boiler coal economizer internal circulation protection device has the advantages that the electricity is saved, the consumption is reduced, the temperature difference pressure caused by poor boiler water circulation can be reduced through internal circulation, the boiler ignition and pressure rise time of the boiler is shortened, the oxygen corrosion on a water supply pipeline and the coal economizer is effectively reduced, and in addition, the cast iron coal economizer is prevented from being damaged through being overheated.
Description
Technical field
The utility model relates to a kind of industrial active boiler with circulation in the economizer, relates in particular to recycling-guard device in the preceding boiler economizer of a kind of igniting steam supply.
Background technology
Industrial Boiler is the boiler that sensing industrial production or life provide steam, hot water, the boiler that steam wherein is provided is a steam boiler, its capacity generally is not more than 20t/h, and operating pressure is not more than 2.5Mpa, and wherein the steam boiler that pressure is not higher than 1.45Mpa in the Industrial Boiler accounts for 90%.Industrial steam boiler configuration economizer is that it plays an important role aspect energy-saving and cost-reducing, and scientific experiment proves, 1 ℃ of the every rising of economizer exit water temperature, just can on average reduce by 2～3 ℃ of exhaust gas temperatures, and 6～7 ℃ of every risings of feed temperature then can save coal-fired 1%.Industrial Boiler is because capacity is less, operating pressure is low, and deoxygenation is not generally carried out in feedwater, because cast iron gilled tube economizer oxytolerant erosion characteristics, what configuration was maximum in the Industrial Boiler is the cast iron type economizer.According to JB/T2192-1993 " square cast iron gilled tube economizer technical conditions ", be used for making HT150 or the HT200 that the cast iron gilled tube economizer material should be not less than GB9439.The economizer that the former makes is used on the steam boiler that nominal steam pressure is not more than 1.6MPa, and the economizer that the latter makes can be used on the steam boiler of nominal steam pressure 1.6～2.5MPa.In TSG G0001-2009 " the boiler safety technology supervision rules " revised draft to being less than 230 ℃ with being not less than the highest permission wall temperature of economizer element that trade mark of casting iron HT150 makes.In GB/T9222-2008 " calculating of pressure parts for water tube boiler intensity ", be t for convection type economizer calculation of Wall Temperature formula
Bi=t
J+ 30, t in the formula
Bi-calculating wall temperature, ℃; t
J-dielectric rating temperature, ℃.By following formula as can be known, the highest permission dielectric rating temperature t
J=230-30=200 ℃.Hence one can see that, and the medium maximum permissible temperature is 200 ℃ in the cast iron gilled tube economizer, and when the steam boiler operating pressure was 1.45Mpa, the accurate temperature of medium was 199.82 ℃.
Cast iron gilled tube economizer heats up in ignition of the boiler, boost to external steam supply before this stage boiler do not need moisturizing, and the flue gas that a small amount of water is easy to be passed through continuously in the economizer tube caused cause thermal damage; On the other hand, the water circulating effect in this stage of boiler is poor, the inequality of being heated, easily causes damage in boilers, so boiler also needed to protect in this stage.
(1) the traditional protection method to cast iron gilled tube economizer has two: one, in economizer one side the bypass flue is set, and makes the high-temperature flue gas of igniting boost phase not walk economizer and the by-passing flue, and its defective can't be recycled for the initial stage fume afterheat; The 2nd, outer loop pipeline (seeing the accompanying drawing dotted portion) is set, lean on the power of feed pump to make feedwater flow return water feeder repeatedly through economizer.Its defective is because the feed pump allocating power is big, thus the power consumption height, the long and big nothing insulation of the water feeder water yield measure of external circulation line in addition, it is limited to make that feed temperature rises.
(2) to the guard method of boiler body: be to heat up and the rate of rise according to the boiler class limitations, the relevant safe practice data regulation of Industrial Boiler at present: that circulate for water, that water capacity is little, evaporation capacity of steam boiler firing up time is not more than 2 tons/hour boiler; Light a fire to from black furnace and to boost during this period of time, must not be less than 1.5 hours, relatively poor for the water circulation, water capacity is big and evaporation capacity is 4～10 tons/hour a boiler, the firing up time is 3～5 hours.Saturated vapor programming rate after boosting for boiler then requires below 60 ℃/hour.
Summary of the invention
The purpose of this utility model provides before a kind of igniting steam supply recycling-guard device in the boiler economizer, ignition of the boiler heats up, boost to external steam supply before this stage rely on this device that cast iron gilled tube economizer is cooled off.
For achieving the above object, the technical solution adopted in the utility model is:
Recycling-guard device in the boiler economizer comprises: boiler-steam dome and economizer before a kind of igniting steam supply; Boiler-steam dome connects a pot water filter, pump inlet valve, high-temperature-hot-water circulating pump, pump discharge valve, economizer and normally closed solenoid valve successively; The water inlet end of economizer is connected with feed pump in addition, and the water inlet end of feed pump is connected with water feeder.
According to recycling-guard device in the boiler economizer before the described igniting steam supply, the two ends of described pump inlet valve and pump discharge valve are parallel with the bypass of a Natural Circulation pipe valve; Be parallel with the check-valves bypass on the described normally closed solenoid valve, be connected with boiler-steam dome by stop valve then.
According to recycling-guard device in the boiler economizer before the described igniting steam supply, described pump inlet valve, pump discharge valve, stop valve are straight-through stop valve.
According to recycling-guard device in the boiler economizer before the described igniting steam supply, boiler-steam dome is connected with the collection case, and the top of collection case blowoff valve is connected with the water inlet end of pot water filter in addition by pipeline.
The beneficial effects of the utility model:
(1) economize on electricity consumption reduction
To hot water circulating pump, electrical power is calculated formula and is: P=Q.H. Γ/3600*102* η, P-power in the formula, kW; The Q-flow, m
3/ h; The H-lift, m; The density of Γ water, kg/m
3η-centrifugal pump efficient, %; The 102-conversion coefficient.According to following calculating, be 2.66m only for its flow of cast iron gilled tube economizer of series connection for each sheet
3/ h; Flow when economizer divides two groups of parallel connections is 5.3m
3/ h, the inventor sees that according to the case of being engaged in the Industrial Boiler check for a long time what a plurality of check-valves were housed is no more than 0.3Mpa to water resistance, both lift was no more than 30m.The model parameter of the high temperature circulation pump that already provides by Shanghai, Shanghai million pumps, 32 (40)-160, its flow selectable range is 2.8～8.3m
3/ h, lift are that the electrical power of 30～33m, pump is 1.5～2.2KW.The boiler that can satisfy operating pressure≤1.0Mpa and water temperature≤240 ℃ uses.It is investigated: (operating pressure at the minimum institute of 0.7～1.6Mpa) feed pump gas-distributing motor power is industrial steam boiler 1～20t/h: the 3KW of 1t/h; The 7.5KW of 2～4t/h, the 15KW of 6t/h, the 30KW of 10～20t/h.So internal circulation apparatus is compared with the external circulating system that adopts feed pump, fully saves energy.
(2) interior circulation can reduce because of the circulate thermal (temperature difference) stress of bad generation of pot water, shortens ignition of the boiler pressure rising time.
(3) effectively alleviate the oxygen corrosion of feedwater piping and economizer, because water feeder communicates with atmosphere, water temperature is low, and the dissolved oxygen in its feedwater is in high level all the time, and interior circulation is in sealing state all the time for pot water, so can effectively alleviate the oxygen corrosion of feedwater piping and economizer.
(4) prevented that cast iron gilled tube economizer from crossing cause thermal damage, fume afterheat has obtained utilization.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
In the accompanying drawing: 1, boiler-steam dome; 2, drum blowoff valve; 3, pot water filter; 4, pump inlet valve; 5, high-temperature-hot-water circulating pump; 6, pump discharge valve; 7, Natural Circulation pipe valve; 8, cast iron gilled tube economizer; 9, normally closed solenoid valve; 10, stop valve; 11, check-valves; 12, collection case; 13; Feed pump; 14, water feeder.
The solid line pipeline is an inner circulating tube system in the accompanying drawing, and dotted line is the outer circulation piping.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments:
The interior recycling-guard device of boiler economizer as shown in Figure 1 before the utility model igniting steam supply, comprise: boiler-steam dome 1 (drum) and economizer 8, boiler-steam dome 1 connect pot water filter 3, pump inlet valve 4, high-temperature-hot-water circulating pump 5, pump discharge valve 6, economizer 8 and normally closed solenoid valve 9 successively; The water inlet end of economizer 8 is connected with feed pump 13 in addition, and the water inlet end of feed pump 13 is connected with water feeder 14.
Described pump inlet valve 4 is parallel with Natural Circulation pipe valve 7 bypasses with the two ends of pump discharge valve 6; Be parallel with check-valves 11 bypasses on the described normally closed solenoid valve 9, be connected with boiler-steam dome 1 by stop valve 10 then.
Described pump inlet valve 4, pump discharge valve 6, stop valve 10 are straight-through stop valve.
Boiler-steam dome 1 is connected with collection case 12, and the top of collection case 12 blowoff valves is connected with the water inlet end of pot water filter 3 in addition by pipeline.
The solid line pipeline is an inner circulating tube system among the utility model Fig. 1, and dotted line is the outer circulation piping.
The interior recycling-guard device of boiler economizer plays the blow-off pipe from boiler-steam dome (drum) or collection lower box part before the utility model igniting steam supply, and the bypass of bypass Natural Circulation, economizer, economizer outlet pipeline and the normally closed solenoid valve and the stop valve pipeline that connect a pot water filter, high-temperature water circulating pump and cross-over connection thereof are successively formed (seeing accompanying drawing solid line part).Boiler before the external steam supply of igniting, the pot water that is heated through force or naturally in circular flow get back to drum after absorbing heat through cast iron gilled tube economizer is further.So cooling off economizer repeatedly makes it wall temperature and does not exceed standard.When boiler begins external steam supply, then close inner loop pipeline, boiler enters normal operation.After this then finish cooling to economizer by feed pump.This internal circulation apparatus also can effectively alleviate the thermal (temperature difference) stress of ignition of the boiler boost phase, improves the boiler heating rate of rise.
Before the igniting steam supply, interior naturally circulation can realize the protection of overall process, but effect is lower than circulation in the pressure.Pipeline plays the blowoff valve top from boiler-steam dome 1 (drum) or collection case 12, successively through the pot water filter 3 filtration, close straight-through stop valve 4,6, close high-temperature-hot-water circulating pump 5 and open natural circulation valve 7, through economizer 8, open normally closed solenoid valve 9 and realize circulation in the nature.
Circulation can only be used in before the boiler working pressure 1.0Mpa in forcing, and corresponding pot coolant-temperature gage is 183 ℃.Reason is to press hot water circulating pump in the low disappearance (circulation can realize in then omnidistance pressure of plugging a gap if any the new type high temperature heat-exchanger pump later on) of raising aspect this journey specification of low discharge in the present homemade high temperature.So when boiler pressure reaches 1.0Mpa, should open high-temperature-hot-water circulating pump bypass valve earlier and close circulating pump and the import and export valve, carry out in the nature circulation with cooling cast iron gilled tube economizer (this moment internal circulation system valve wide open, resistance drops to minimum, can be equal to the station boiler recirculation pipe).This device uses at the following steam boiler of rated pressure≤1.45Mpa, can guarantee 230 ℃ of following provisions of cast iron gilled tube economizer wall temperature.
Pipeline plays the blowoff valve top from boiler-steam dome 1 or collection case 12, successively through the filtration of pot water filter 3, open straight-through stop valve 4,6, open high-temperature-hot-water circulating pump 5 and close natural circulation valve 7, through economizer 8, open normally closed solenoid valve 9 and realize forcing interior circulation.
Heating power calculates:
1, high temperature circulation water heater pump discharge and lift are selected
(1) flow rate calculation: JB/T2192-93 " square cast iron gilled tube economizer technical conditions ", for the economizer of pipe range 1.0-1.2 rice, bore is 50 millimeters; For pipe range is 1.5～3.0 meters economizer, and its bore is 56 millimeters or 60 millimeters.For cast iron gilled tube economizer in-pipe flow speed by 0.3～0.5m/s (the boiler interrelated data pushes away and builds).The flow rate calculation formula is: Q=3.14*D
2* S/4, Q-is a flow in the formula, m
3/ h; D-economizer tube internal diameter m; The S-flow velocity, m/h.The selection caliber is 56mm, gets flow velocity 0.3m/s; Flow is 2.66m during the series connection of substitution following formula
3/ h; When dividing two-way in parallel is 5.3m
3/ h.
(2) pump lift is chosen: the inventor sees according to the case of being engaged in the Industrial Boiler check for a long time, two water resistances (observing feed pump outlet gauge pressure and drum gauge pressure in the boiler operatiopn) of giving with upper check valve are housed are no more than 0.3Mpa, so select lift both can for 30 meters.
(3) choosing of pump type: model is selected 32 (40)-160 types.Corresponding power of motor is 1.5KW, and lift is 32m.Flow all can satisfy and is not less than 6.5m
3/ h requirement.
Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and protection domain are limited; under the prerequisite that does not break away from the utility model design concept; common engineers and technicians make the technical solution of the utility model in this area various modification and improvement all should fall into protection domain of the present utility model.
Claims (4)
1. the interior recycling-guard device of the preceding boiler economizer of igniting steam supply comprises: boiler-steam dome (1) and economizer (8); It is characterized in that: boiler-steam dome (1) connects pot water filter (3), pump inlet valve (4), high-temperature-hot-water circulating pump (5), pump discharge valve (6), economizer (8) and normally closed solenoid valve (9) successively; The water inlet end of economizer (8) is connected with feed pump (13) in addition, and the water inlet end of feed pump (13) is connected with water feeder (14).
2. recycling-guard device in the boiler economizer before the igniting steam supply according to claim 1 is characterized in that: described pump inlet valve (4) is parallel with a Natural Circulation pipe valve (7) bypass with the two ends of pump discharge valve (6); Be parallel with check-valves (11) bypass on the described normally closed solenoid valve (9), be connected with boiler-steam dome (1) by stop valve (10) then.
3. recycling-guard device in the boiler economizer before the igniting steam supply according to claim 2, it is characterized in that: described pump inlet valve (4), pump discharge valve (6), stop valve (10) are straight-through stop valve.
4. recycling-guard device in the boiler economizer before the igniting steam supply according to claim 1 is characterized in that: boiler-steam dome (1) is connected with collection case (12), and the top of collection case (12) blowoff valve is connected with the water inlet end of pot water filter (3) in addition by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200249213U CN201909306U (en) | 2011-01-21 | 2011-01-21 | Boiler coal economizer internal circulation protection device before ignition and steam supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200249213U CN201909306U (en) | 2011-01-21 | 2011-01-21 | Boiler coal economizer internal circulation protection device before ignition and steam supply |
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| Publication Number | Publication Date |
|---|---|
| CN201909306U true CN201909306U (en) | 2011-07-27 |
Family
ID=44301507
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200249213U Expired - Fee Related CN201909306U (en) | 2011-01-21 | 2011-01-21 | Boiler coal economizer internal circulation protection device before ignition and steam supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020694A (en) * | 2015-06-30 | 2015-11-04 | 烟台创元热能科技有限公司 | Boiler water replenishing system having overflow pipe |
| CN106051735A (en) * | 2016-07-01 | 2016-10-26 | 无锡锡能锅炉有限公司 | Coal economizer connecting system of fuel gas boiler |
| CN106122931A (en) * | 2016-07-01 | 2016-11-16 | 无锡锡能锅炉有限公司 | Gas fired-boiler economizer connecting line system |
| CN114263901A (en) * | 2021-12-02 | 2022-04-01 | 中国电建集团贵州电力设计研究院有限公司 | Adjusting method of pipeline system for adjusting boosting rate in boiler overpressure experiment |
-
2011
- 2011-01-21 CN CN2011200249213U patent/CN201909306U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105020694A (en) * | 2015-06-30 | 2015-11-04 | 烟台创元热能科技有限公司 | Boiler water replenishing system having overflow pipe |
| CN106051735A (en) * | 2016-07-01 | 2016-10-26 | 无锡锡能锅炉有限公司 | Coal economizer connecting system of fuel gas boiler |
| CN106122931A (en) * | 2016-07-01 | 2016-11-16 | 无锡锡能锅炉有限公司 | Gas fired-boiler economizer connecting line system |
| CN114263901A (en) * | 2021-12-02 | 2022-04-01 | 中国电建集团贵州电力设计研究院有限公司 | Adjusting method of pipeline system for adjusting boosting rate in boiler overpressure experiment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110727 Termination date: 20120121 |