CN203656895U - Device for preventing low temperature corrosion on coal economizer heating surfaces - Google Patents
Device for preventing low temperature corrosion on coal economizer heating surfaces Download PDFInfo
- Publication number
- CN203656895U CN203656895U CN201320662282.2U CN201320662282U CN203656895U CN 203656895 U CN203656895 U CN 203656895U CN 201320662282 U CN201320662282 U CN 201320662282U CN 203656895 U CN203656895 U CN 203656895U
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- heat exchanger
- economizer
- drum
- water inlet
- blender
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- 238000005260 corrosion Methods 0.000 title claims abstract description 58
- 238000010438 heat treatment Methods 0.000 title claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title abstract 12
- 239000003245 coal Substances 0.000 title abstract 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 239000002184 metal Substances 0.000 abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000002028 Biomass Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 235000014171 carbonated beverage Nutrition 0.000 description 3
- 230000003628 erosive Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 load Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a device for preventing low temperature corrosion on coal economizer heating surfaces, and belongs to the technical field of boilers. The device comprises a coal economizer system pipeline, a boiler barrel and a mixer, wherein a heat exchanger is arranged on the steam side inside the boiler barrel; the water inlet of the heat exchanger is connected with a heat exchanger water inlet pipe; the heat exchanger water inlet pipe is connected with a feedwater control stand; the water outlet of the heat exchanger is connected with a heat exchanger water return pipe; the heat exchanger water return pipe is connected with the mixer; the mixer is further connected with a water inlet pipe; the water inlet pipe is connected with the feedwater control stand; the outlet of the mixer is connected with the coal economizer inlet header of the coal economizer; the coal economizer outlet header of the coal economizer is connected with the boiler barrel through a boiler barrel feedwater pipe. According to the device, the metal wall temperature of the coal economizer inlet end can be over 150 DEG C, so that the most unsubstantial coal economizer inlet end can be free from low temperature corrosion; the metal wall temperature of the coal economizer is improved, and the phenomenon of low temperature corrosion on the coal economizer heating surfaces of the whole coal economizer can be prevented.
Description
Technical field
The utility model relates to biomass direct-combustion boiler technical field, especially a kind of technology that prevents economizer surface cold end corrosion.
Background technology
At present, biomass direct-combustion boiler has been applied at home and has promoted, but due to reasons such as biomass fuel undersupplies, boiler can not be operated at full capacity throughout the year under B-MCR, this just makes steam turbine not operate at full capacity, the related boiler feed temperature that causes is throughout the year lower than design load (being generally all not less than 150 ℃), and once tube wall temperature is lower than 150 ℃, cold end corrosion speed will be how much multiples to be increased, economizer is caused to corrosion aggravation phenomenon, booster is frequent, and boiler continuous operating time significantly shortens, and causes damage to economy of power plant.At present, in domestic boiler technology, also do not protect economizer to avoid the good method of cold end corrosion puzzlement, run into such situation very general, under such operating mode, economizer can only be accepted cold end corrosion passively.
Utility model content
Goal of the invention of the present utility model is: for the problem of above-mentioned existence, a kind of device that prevents economizer surface cold end corrosion is provided, at the economizer entrance point of economizer medium temperature minimum point, economizer inlet water temperature is brought up to 150 ℃ of the critical points of cold end corrosion speed aggravation, make the tube wall temperature of economizer entrance point higher than 150 degree, thereby can make the weakest economizer entrance point avoid cold end corrosion, improve the tube wall temperature of economizer, made whole economizer can prevent the phenomenon of economizer surface cold end corrosion.
The technical solution adopted in the utility model is as follows:
The device that prevents economizer surface cold end corrosion of the present utility model, comprise economizer, drum and blender, steam side in described drum is provided with heat exchanger, the water inlet of described heat exchanger is connected with heat exchanger water inlet pipe, described heat exchanger water inlet pipe is connected on feedwater console, the delivery port of described heat exchanger is connected with heat exchanger return pipe, described heat exchanger return pipe is connected on blender, on described blender, be also connected with water inlet pipe, described water inlet pipe is connected on feedwater console, the outlet of described blender is connected in the economizer import header of economizer, the economizer exit header of described economizer is connected in drum by drum feed pipe.
Owing to having adopted said structure, drum is the equipment that the steam water interface of saturation state is separated into water and steam, the latter half of drum inside is stored saturation water, the first half is full of saturated vapor, from the angle of thermal conduction study, the heat transfer coefficient of the ratio of heat transfer coefficient water of steam is much bigger, heat exchanger is arranged on steam side, also in the first half of drum inside, arrange that heat exchanger using rate of metal is the highest, feedwater console is for controlling to the Cold water supply of blender and heat exchanger, heat exchanger water inlet pipe can be fed to the cold water after feedwater console to turn in hot device, heat exchanger can heat the cold water of supply in drum, the heating surface of heat exchanger can obtain by calculating as required, through the heating in drum, cold water becomes hot water in heat exchanger, hot water can flow back into blender from heat exchanger return pipe, on blender, be connected on feedwater operating desk by water inlet pipe in addition, make existing Cold water supply in blender, also there is the hot water supply after being heated, and after mixing, reach 150 ° more than C in blender, make in blender, mixed and reach 150 ° more than C with the feedwater that there is no heating by the steam-heated feedwater of drum, and then 150 ° of hot water more than C are sent in economizer import header together, make the tube wall temperature of economizer entrance point higher than 150 degree, thereby can make the weakest economizer entrance point avoid cold end corrosion, improve the tube wall temperature of economizer, make whole economizer can prevent the phenomenon of economizer surface cold end corrosion.When too low through boiler feed temperature, hot water temperature after heated in drum adds cold water again, may cause water temperature in blender at 150 ° below C time, now can close the valve on blender water inlet pipe, make to feed water 100% all heated through drum, enter into again blender, thereby can make the weakest economizer entrance point avoid cold end corrosion.Heat exchanger in the utility model is according to maximum stream flow operating mode (100% feedwater is all through drum) design, water temperature can be heated to 150 ℃ of designs by 105 ℃, heating surface is considered certain nargin, guarantee under extreme case, feedwater through oxygen-eliminating device can be heated to 150 ℃, prevents that cold end corrosion from occurring in economizer region.
The device that prevents economizer surface cold end corrosion of the present utility model, described heat exchanger is arranged in the first half in drum, the top of described heat exchanger is provided with equal vapour plate, the below of described heat exchanger is provided with steam cleaner, the below of described steam cleaner is provided with cyclone separator, on described cyclone separator, be connected with drum feed pipe, the below of described cyclone separator is provided with common downcomer.
Drum is the equipment that the steam water interface of saturation state is separated into water and steam, the latter half of drum inside is stored saturation water, the first half is full of saturated vapor, from the angle of thermal conduction study, the heat transfer coefficient of steam is much bigger more than the heat transfer coefficient of water, in the first half of drum inside, arrange that heat exchanger using rate of metal is the highest, therefore select saturated vapor in the drum thermal source as heat exchange, and heat exchanger is arranged on steam side, also be the top that heat exchanger is positioned at cyclone separator, owing to having adopted said structure, make the isolated saturated vapor of cyclone separator, the cold water passing through in heat exchanger heats, calculated by heat conversion, can calculate quickly and easily the size of the middle heating surface of heat exchanger, be convenient to design heat exchanger.Drum feed pipe provides feedwater to drum, water in drum enters burner hearth evaporating heating surface by common downcomer, carry out heat exchange at this place, obtain heat and become steam water interface later, get back to drum through carbonated drink tube connector, the power of whole circulation, from the density contrast of the steam water interface in water and evaporating heating surface in common downcomer, forms Natural Circulation thus.Carbonated drink tube connector feeds steam water interface in cyclone separator, cyclone separator can be separated into steam water interface saturated vapor and water, saturated vapor is wherein after steam cleaner cleans, heat exchanger heats, can obtain maximum heat transfer coefficient, be maximum heat exchange efficiency, make heat exchanger using rate of metal reach maximum.After heat exchanger heat exchange, part steam-condensation Cheng Shui, the water droplet that becomes having hangs over exchanger tube wall below, more long-pending larger, when acquiring a certain degree, fall into hydrospace, drum below, a part rises with steam, in the time of the equal vapour plate through heat exchanger top, be separated, again fall into hydrospace, thereby guarantee that saturated vapor quality is qualified, guarantee Turbine Safety operation; Can be gathered in the common downcomer below it and separated water later by cyclone separator, being dispensed into burner hearth evaporating heating surface by down-comer heats, and then get back to drum, whole process power is from the density contrast of steam water interface saturated in saturation water in common downcomer and evaporating heating surface, thus formation Natural Circulation.Heat exchanger in the utility model is according to maximum stream flow operating mode (100% feedwater is all through drum) design, water temperature can be heated to 150 ℃ of designs by 105 ℃, heating surface is considered certain nargin, guarantee under extreme case, feedwater through oxygen-eliminating device can be heated to 150 ℃, prevents that cold end corrosion from occurring in economizer region.
The device that prevents economizer surface cold end corrosion of the present utility model, is connected with recirculation pipe on described common downcomer, and described recirculation pipe is connected on the water inlet pipe of blender.
Owing to having adopted said structure, the liquid after carbonated drink in drum separates, collects in the common downcomer of drum inner bottom part and discharges, and wherein on the sidewall of common downcomer, is connected with recirculation pipe.Boiler, in initial start stage, due to the power resources that the water in economizer does not flow, is processed inactive state, and through high-temperature flue gas heating, specific volume changes, and easily causes water hammer, and economizer tube wall is caused damage.Such arrangement form, makes the water in economizer by forming natural convection loop between recirculation pipe and drum, to prevent and treat the generation of water hammer.
The device that prevents economizer surface cold end corrosion of the present utility model, the heating surface of described heat exchanger adopts the horizontal steam cleaner top that is arranged in.
Owing to having adopted said structure, the heating surface of heat exchanger adopts horizontal arrangement form, the saturated vapor heating surface of flowing through from bottom to top, condenses into water droplet and stays and get back to waters after heat release, the vapor stream not condensing is crossed and left drum through secondary separation after heat exchanger and go to superheater system.
The device that prevents economizer surface cold end corrosion of the present utility model, the exit of described blender is provided with surveys the thermocouple that water temperature is used.
Owing to having adopted said structure, in blender, mixed with the feedwater that there is no heating by the steam-heated feedwater of drum, then enter together economizer import header, before blender is being left in the mixed feedwater of blender, need to be by its water temperature of thermocouple measurement, guarantee that the feed temperature that enters economizer import header is more than 150 ℃, also convenient operation person controls the water yield that enters heat exchanger simultaneously, thereby guarantee to reach 150 ° of temperature more than C after feedwater mixes in blender, thereby make the tube wall temperature of economizer entrance point higher than 150 degree, thereby can make the weakest economizer entrance point avoid cold end corrosion, improve the tube wall temperature of economizer, make whole economizer can prevent the phenomenon of economizer surface cold end corrosion.
The device that prevents economizer surface cold end corrosion of the present utility model, described heat exchanger water inlet pipe is provided with control valve, and described heat exchanger return pipe is provided with check-valves.
Owing to having adopted said structure, check-valves can avoid the aqueous reflux in blender to enter heat exchanger effectively, control valve on heat exchanger water inlet pipe, can regulate entering the discharge of heat exchanger in drum, finally guarantees that in blender mixed water temperature is at 150 ° more than C.
In sum, owing to having adopted technique scheme, heated water of the present utility model through beneficial effect is:
1, the device that prevents economizer surface cold end corrosion of the present utility model, simple in structure, easy and simple to handle, easy to use, can effectively prevent economizer surface cold end corrosion, is adapted at boiler technology field and applies.
2, the device that prevents economizer surface cold end corrosion of the present utility model, at the economizer entrance point of economizer medium temperature minimum point, economizer inlet water temperature is brought up to 150 ℃ of the critical points of cold end corrosion speed aggravation, make the tube wall temperature of economizer entrance point higher than 150 degree, thereby can make the weakest economizer entrance point avoid cold end corrosion, improve the tube wall temperature of economizer, made whole economizer can prevent the phenomenon of economizer surface cold end corrosion.
Accompanying drawing explanation
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of drum in the utility model;
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the schematic diagram that is related to of metal erosion speed and tube wall temperature.
Mark in figure: 1-drum, 2-blender, 3-economizer, 3-1-economizer import header, 3-2-economizer exit header, 4-thermocouple, 5-heat exchanger water inlet pipe, 6-heat exchanger return pipe, 7-drum feed pipe, 8-common downcomer, 9-recirculation pipe, 10-control valve, 11-check-valves, 12-feedwater console, 13-heat exchanger, the equal vapour plate of 14-, 15-steam cleaner, 16-cyclone separator.
The specific embodiment
Disclosed all features in this description, or step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Disclosed arbitrary feature in this description (comprising any accessory claim, summary), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.
The device that prevents economizer surface cold end corrosion of the present utility model, often to meet with sulfur corrosion different from conventional coal-burning boiler, and the corrosion of biomass boiler is mainly from elemental chlorine.See the schematic diagram that is related to of Fig. 4 metal erosion speed and tube wall temperature.
Metal surface (tube wall) temperature (℃)
As seen from the figure, the low-temperature zone below 150 ℃, is mainly electrochemical corrosion, and metal erosion speed is very fast.Therefore, the utility model is in order to solve cold end corrosion problem, and one of reason of just aggravating from cold end corrosion speed---tube wall temperature is set about, and solves an economizer cold end corrosion difficult problem.
The heating surface tube wall temperature of economizer, depends on the factor of following several respects: flue-gas temperature, medium temperature, flue gas flow rate, velocity of medium, metal material etc.: wherein flue-gas temperature is less on the impact of tube wall temperature; The replacement cost that flue gas flow rate is brought by Fan Selection economy and heating surface wear affects larger, has formed the cigarette speed optimum range that cost performance is the highest; Velocity of medium is affected greatly by on-way resistance, and larger flow velocity no doubt can reduce tube wall temperature to a certain extent, but will increase the power of feed pump, and larger water pump and power of fan will increase operating cost, reduce economy of power plant; Metal material is chosen according to product cost performance supreme principle, can not change easily; Medium temperature has the greatest impact to tube wall temperature.
In sum, the utility model utilization affects the most significantly medium temperature of tube wall temperature, consider that especially economizer medium temperature minimum point is positioned at economizer entrance point, this place is the weak link of cold end corrosion just, as long as economizer inlet water temperature is brought up to 150 ℃ of the critical points of cold end corrosion speed aggravation, and this place's flue-gas temperature must be higher than 150 ℃, this place's tube wall temperature is necessarily higher than 150 ℃ like this, thereby avoids cold end corrosion.
As Fig. 1, shown in Fig. 2 and Fig. 3, the device that prevents economizer surface cold end corrosion of the present utility model, comprise economizer 3, drum 1 and blender 2, steam side in described drum 1 is provided with heat exchanger 13, wherein said heat exchanger 13 is arranged in the first half in drum 1, the heating surface of wherein said heat exchanger 13 adopts horizontal steam cleaner 15 tops that are arranged in, the top of described heat exchanger 13 is provided with equal vapour plate 14, the below of described heat exchanger 13 is provided with steam cleaner 15, the below of described steam cleaner 15 is provided with cyclone separator 16, the described drum top vapor space is provided with drum feed pipe 7, the below of described cyclone separator 16 is provided with common downcomer 8, on described common downcomer 8, be connected with recirculation pipe 9, described recirculation pipe 9 is connected on the water inlet pipe of blender 2, the water inlet of described heat exchanger 13 is connected with heat exchanger water inlet pipe 5, described heat exchanger water inlet pipe 5 is connected on feedwater console 12, state heat exchanger water inlet pipe 5 and be provided with control valve 10, the delivery port of described heat exchanger 13 is connected with heat exchanger return pipe 6, described heat exchanger return pipe 6 is connected on blender 2, described heat exchanger return pipe 6 is provided with check-valves 11, on described blender 2, be also connected with water inlet pipe, described water inlet pipe is connected on feedwater console 12, the outlet of described blender 2 is connected on the economizer import header 3-1 of economizer 3, the exit of wherein said blender 2 is provided with surveys the thermocouple 4 that water temperature is used, the economizer exit header 3-2 of described economizer 3 is connected in drum 1 by drum feed pipe 7.
The heating surface of the heat exchanger in the utility model adopts horizontal arrangement form, the saturated vapor heating surface of flowing through from bottom to top, after heat release, condense into water droplet and stay and get back to waters, the vapor stream not condensing is crossed and is left drum through secondary separation after heat exchanger and go to superheater system.
The device that prevents economizer surface cold end corrosion of the present utility model, from the shunting of main feedwater arterial highway, drum is directly removed in part feedwater, control valve is set on pipeline and regulates going to the discharge of heat exchanger in drum.Feedwater in drum with carry out heat exchange through the saturated vapor of first separation and be heated to after uniform temperature, leave drum and go to blender.In blender, mixed with the feedwater that there is no heating by the steam-heated feedwater of drum, then enter together economizer import header, mixed economizer feedwater is by thermocouple measurement water temperature before leaving blender, and the control valve of going to the supply line of drum by adjusting regulates the discharge of going to heat exchanger in drum.In the time that boiler feed temperature is too low, the electric check valve that main feedwater can be gone on blender pipeline cuts out, and makes to feed water 100% all through drum.
In the utility model, drum is the equipment that the steam water interface of saturation state is separated into water and steam, the latter half of drum inside is stored saturation water, the first half is full of saturated vapor, from the angle of thermal conduction study, the heat transfer coefficient of the ratio of heat transfer coefficient water of steam is far much bigger, heat exchanger is arranged on steam side, also in the first half of drum inside, arrange that heat exchanger using rate of metal is the highest, feedwater console is for controlling to the Cold water supply of blender and heat exchanger, heat exchanger water inlet pipe can be fed to the cold water after feedwater console in heat exchanger, heat exchanger can heat the cold water of supply in drum, the heating surface of heat exchanger can obtain by calculating as required, through the heating in drum, cold water becomes hot water in heat exchanger, hot water can flow back into blender from heat exchanger return pipe, on blender, be connected on feedwater operating desk by water inlet pipe in addition, make existing Cold water supply in blender, also there is the hot water supply after being heated, and after mixing, reach 150 ° more than C in blender, and then 150 ° of hot water more than C are sent in economizer import header together, make the tube wall temperature of economizer entrance point higher than 150 degree, thereby can make the weakest economizer entrance point avoid cold end corrosion, improve the tube wall temperature of economizer, make whole economizer can prevent the phenomenon of economizer surface cold end corrosion.When too low through boiler feed temperature, hot water temperature after heated in drum adds cold water again, may cause water temperature in blender at 150 ° below C time, now can close the valve on blender water inlet pipe, make to feed water 100% all heated through drum, enter into again blender, thereby can make the weakest economizer entrance point avoid cold end corrosion.Heat exchanger in the utility model is according to maximum stream flow operating mode (100% feedwater is all through drum) design, water temperature can be heated to 150 ℃ of designs by 105 ℃, heating surface is considered certain nargin, guarantee under extreme case, feedwater through oxygen-eliminating device can be heated to 150 ℃, prevents that cold end corrosion from occurring in economizer region.
The device that prevents economizer surface cold end corrosion of the present utility model, at the economizer entrance point of economizer medium temperature minimum point, economizer inlet water temperature is brought up to 150 ℃ of the critical points of cold end corrosion speed aggravation, make the tube wall temperature of economizer entrance point higher than 150 degree, thereby can make the weakest economizer entrance point avoid cold end corrosion, improve the tube wall temperature of economizer, made whole economizer can prevent the phenomenon of economizer surface cold end corrosion.
The utility model is not limited to the aforesaid specific embodiment.The utility model expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.
Claims (6)
1. one kind prevents the device of economizer surface cold end corrosion, it is characterized in that: it comprises economizer (3), drum (1) and blender (2), steam side in described drum (1) is provided with heat exchanger (13), the water inlet of described heat exchanger (13) is connected with heat exchanger water inlet pipe (5), described heat exchanger water inlet pipe (5) is connected on feedwater console (12), the delivery port of described heat exchanger (13) is connected with heat exchanger return pipe (6), described heat exchanger return pipe (6) is connected on blender (2), described blender is also connected with water inlet pipe on (2), described water inlet pipe is connected on feedwater console (12), the outlet of described blender (2) is connected in the economizer import header (3-1) of economizer (3), the economizer exit header (3-2) of described economizer (3) is connected in drum (1) by drum feed pipe (7).
2. the device that prevents economizer surface cold end corrosion as claimed in claim 1, it is characterized in that: described heat exchanger (13) is arranged in the first half in drum (1), the top of described heat exchanger (13) is provided with equal vapour plate (14), the below of described heat exchanger (13) is provided with steam cleaner (15), the below of described steam cleaner (15) is provided with cyclone separator (16), on described cyclone separator (16), be connected with drum feed pipe (7), the below of described cyclone separator (16) is provided with common downcomer (8).
3. the device that prevents economizer surface cold end corrosion as claimed in claim 2, is characterized in that: on described common downcomer (8), be connected with recirculation pipe (9), described recirculation pipe (9) is connected on the water inlet pipe of blender (2).
4. the device that prevents economizer surface cold end corrosion as claimed in claim 2, is characterized in that: the heating surface of described heat exchanger (13) adopts horizontal steam cleaner (15) top that is arranged in.
5. the device that prevents economizer surface cold end corrosion as described in one of claim 1 to 4, is characterized in that: the exit of described blender (2) is provided with surveys the thermocouple (4) that water temperature is used.
6. the device that prevents economizer surface cold end corrosion as claimed in claim 5, is characterized in that: described heat exchanger water inlet pipe (5) is provided with control valve (10), and described heat exchanger return pipe (6) is provided with check-valves (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320662282.2U CN203656895U (en) | 2013-10-25 | 2013-10-25 | Device for preventing low temperature corrosion on coal economizer heating surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320662282.2U CN203656895U (en) | 2013-10-25 | 2013-10-25 | Device for preventing low temperature corrosion on coal economizer heating surfaces |
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| Publication Number | Publication Date |
|---|---|
| CN203656895U true CN203656895U (en) | 2014-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320662282.2U Withdrawn - After Issue CN203656895U (en) | 2013-10-25 | 2013-10-25 | Device for preventing low temperature corrosion on coal economizer heating surfaces |
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| CN (1) | CN203656895U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727519A (en) * | 2013-10-25 | 2014-04-16 | 华西能源工业股份有限公司 | Device for preventing low-temperature corrosion of economizer heating surface |
| CN107208876A (en) * | 2015-02-10 | 2017-09-26 | 三菱重工业株式会社 | The feed water system of boiler and possess the boiler of the feed water system of boiler and the control method of the feed water system of boiler |
-
2013
- 2013-10-25 CN CN201320662282.2U patent/CN203656895U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727519A (en) * | 2013-10-25 | 2014-04-16 | 华西能源工业股份有限公司 | Device for preventing low-temperature corrosion of economizer heating surface |
| CN107208876A (en) * | 2015-02-10 | 2017-09-26 | 三菱重工业株式会社 | The feed water system of boiler and possess the boiler of the feed water system of boiler and the control method of the feed water system of boiler |
| CN107208876B (en) * | 2015-02-10 | 2018-09-18 | 三菱重工业株式会社 | The feed water system of boiler and have the boiler of the feed water system of boiler and the control method of the feed water system of boiler |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140618 Effective date of abandoning: 20150520 |
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| RGAV | Abandon patent right to avoid regrant |