CN206929761U - A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device - Google Patents
A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device Download PDFInfo
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- CN206929761U CN206929761U CN201720563029.XU CN201720563029U CN206929761U CN 206929761 U CN206929761 U CN 206929761U CN 201720563029 U CN201720563029 U CN 201720563029U CN 206929761 U CN206929761 U CN 206929761U
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- temperature
- dew point
- moisturizing
- economizer
- flue gas
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Abstract
A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device, including economizer, the preventing and treating device include make-up water preheater, and the make-up water preheater connects with economizer；In economizer flue gas side outlet, flue gas dew point sensor, economizer heat transfer element outer wall arrangement tube wall temperature sensor are set；Moisturizing temperature sensor is set in make-up water preheater outlet line, the flue gas dew point sensor connects after being connected with flue gas dew point tester with temperature controller；The tube wall temperature sensor connects after being connected with heat exchanger tube wall temperature collector with temperature controller；The moisturizing temperature sensor connects after being connected with moisturizing Temperature sampler with temperature controller；And temperature controller connects with make-up water preheater.The utility model only need to increase a set of make-up water preheater and corresponding control system to original design system, and system reform amount is small, can reach that investment is small, work on the spot amount is small, the low effect of enforcement difficulty.
Description
Technical field
The utility model belongs to waste heat boiler preventing corrosion of dew points technical field, especially for a kind of Economizer of Heat Recovery Boiler
The anti-locking apparatus of heat exchanger tube dew point corrosion.
Background technology
Afterheat boiler system is the industry such as oil refining, chemical industry, electric power, steel Mist heat recovering, reduces smog discharge temperature
Main device.With the implementation of energy-saving policy, industrial furnace flue gas exit temperature gradually reduces, and general fuel oil or combustion
Contain part sulphur in material gas, SO is generated after burning2, it is further oxidized to SO3, after flue-gas temperature declines, flue gas reclaimed water separates
Now condense, with SO3With reference to generation sulfuric acid droplets, it is adhered to together with flue dust on heat transfer element.This necessarily causes to go out close to flue gas
Waste-heat recovery device at mouthful（Mainly reclaim the device of low-temperature flue gas waste heat）Heat transfer element（Such as finned tube）Metallic walls
Temperature is less than flue gas acid dew point temperature so that acid is exposed at heat transfer original paper surface and condensed, so as to which dew point corrosion occurs in the original paper that causes to conduct heat.
Generally in the design of low temperature exhaust heat retracting device, designer is set exhaust gas temperature to prevent low-temperature dew point corrosion
Higher than dew-point temperature about 50, this necessarily causes exhaust gas temperature too high, and the policy that can not only reach national " energy-saving " will
Ask, while also result in energy dissipation, environmental pollution etc..
Patent 20071192602.1 proposes a kind of dew-point corrosion resistant residual heat recovering system, and the program has by setting
Cooling fluid temperature self compensation and the system of heat exchanger wall temperature regulating power, by adjusting cold fluid flow, make heat exchanger lowermost wall
Temperature on flue gas dew point temperature, effectively can avoid heat exchanger from dew point corrosion occur everywhere.But the system design is complicated,
Control program is cumbersome, sets up in theory, but due to being limited by the condition of actual device and operating environment, the program is in practice
It is unable to reach large-scale application popularization.
Utility model content
The utility model provides a kind of waste heat boiler low-temperature dew point corrosion preventing and treating device, not only can in new device with
Outside main system is applied jointly, is both in old plant modification project, can be reached that investment is small, work on the spot amount is small, it is difficult to implement
Spend low effect.
Technical scheme is used by the utility model：
A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device, including economizer, the preventing and treating device include make-up water preheater,
The make-up water preheater connects with economizer；In economizer flue gas side outlet, flue gas dew point sensor, economizer heat transfer element are set
Outer wall arranges tube wall temperature sensor；Moisturizing temperature sensor is set in make-up water preheater outlet line, the flue gas dew point passes
Sensor connects after being connected with flue gas dew point tester with temperature controller；Tube wall temperature sensor and heat exchanger tube wall the temperature collection
Connected after device connection with temperature controller；After the moisturizing temperature sensor connects with moisturizing Temperature sampler and temperature controller
Connection；And temperature controller connects with make-up water preheater.
On the premise of the utility model dew point corrosion can occur ensureing economizer, reduce as far as possible to original device
And the transformation of system, and the special substance that can avoid using price higher to prevent dew point corrosion pay it is high
Equipment investment.The system can realize the real-time monitoring of dew-point temperature simultaneously, the on-line operation of control system, ensure that device is in office
The appearance of dew point corrosion can be avoided under conditions of what working conditions change, there is application value.The utility model not only can be with
Applied jointly with outside main system in new device, be both in old plant modification project, small, the live work of investment can be reached
Work amount is small, the low effect of enforcement difficulty.
Brief description of the drawings
Fig. 1 is Tthe utility model system FB(flow block)；
Fig. 2 is FB(flow block) when the utility model make-up water preheater uses electrical heating；
Fig. 3 is FB(flow block) when the utility model make-up water preheater is heated using steam.
Embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings.
Embodiment 1, reference picture 1, a kind of waste heat boiler low-temperature dew point corrosion prevent and treat device, including economizer, and this prevents purchasing things necessary for a long journey
Put including make-up water preheater 2, the make-up water preheater 2 connects with economizer 1；In the flue gas side outlet of economizer 1, flue gas dew point is set
Sensor 3, the heat transfer element outer wall of economizer 1 arrangement tube wall temperature sensor 4；In the outlet line of make-up water preheater 2, moisturizing is set
Temperature sensor 5, the flue gas dew point sensor 3 connect after being connected with flue gas dew point tester with temperature controller；The gold
Category wall temperature sensor 4 connects after being connected with heat exchanger tube wall temperature collector with temperature controller；The moisturizing temperature sensor 5 and benefit
Connected after the connection of coolant-temperature gage collector with temperature controller；And temperature controller and make-up water preheater 2 connect.
The flue gas dew point sensor 3 is the principle using acid dew point satisfactory electrical conductivity, is realized to flue gas acid dew point temperature
Real-time measurement.
The heat exchanger tube tube wall temperature sensor 4 uses resistant to elevated temperatures aciculiform armoured thermocouple/thermal resistance, by itself and heat exchange
Pipe outer wall connects and carries out heat exchanger tube wall temperature measurement.
The moisturizing temperature sensor 5 is moisturizing temperature of the real-time detection into economizer, resistance and temperature can be used to pass
Sensor.
The tube wall temperature sensor 4 and moisturizing temperature sensor 5 set multiple, to be measured with guarantee accuracys.
The economizer 1 and make-up water preheater 2 are respectively provided with bypass, ensure in economizer or make-up water preheater failure
Or the normal operation of steam generator system is not influenceed during maintenance.
The make-up water preheater can use electric heater（Shown in Fig. 2）Or vapor preheater（Shown in Fig. 3）.Vapor preheater
Shell-and-tube heat exchanger, full-welding plate-type heat exchanger etc. high-performance heat exchanger can be used, has and takes up an area the spies such as small, heat transfer efficiency is high
Point.
The temperature controller can carry out simple software programming realization, Industry Control system in conventional industrial control system
System can use DCS or PLC（Programmable controller）, different types can be selected according to on-site actual situations.The temperature controller
Output signal it is different according to the type of make-up water preheater, the control signal of output is different.
The temperature controller mainly includes moisturizing temperature calculator 11, and calculation of Wall Temperature device 12 and dew-point temperature calculate device 13,
Wherein moisturizing temperature controller 11 and calculation of Wall Temperature device 12 are designed using 3oo2 Redundancy Designs thinking, can be in Industry Control system
Pass through programming realization in system DCS or PLC（Reference picture 2）.In the system temperature controller can realize to the record of dew-point temperature and
Monitoring, while heat transfer element tube wall temperature and moisturizing temperature are monitored.Specifically will gather come flue gas dew point temperature with
Tube wall temperature real time contrast, if tube wall temperature occur is less than flue gas dew point temperature, the possibility of dew point corrosion just occurs, it is now warm
Controller is spent by adjusting make-up water preheater so that moisturizing temperature raises, and after temperature raises, temperature controller is according to moisturizing temperature
Degree releases theoretical metal wall temperature, further compared with actual metal wall temperature, so as to constantly adjust system model parameter, reaches accurate
The requirement of control.Because actual temperature control gains are larger, therefore by the adjustment constantly to system model, using feedforward plus instead
Feedback control mode realizes PREDICTIVE CONTROL to dew-point temperature.Further on the premise of avoiding heat transfer element from dew point corrosion occur, carry
High control system it is ageing.
Embodiment 2, as shown in Fig. 2 make-up water preheater uses electric heating system.
Make-up water preheater 2 can be realized using electric heater 6 in system.This mode realize it is fairly simple, and control
Response speed is very fast, and scene needs the controller switching equipment of enough power, and the power of electric heater is adjusted by power governor, is reached
To the purpose of control moisturizing temperature.Remaining same embodiment 1.
Embodiment 3, as shown in figure 3, make-up water preheater uses steam-heating system.
Make-up water preheater 2 is realized using steam heater 7 in system.Such a mode needs scene to provide respective negative
The steam of lotus（Low pressure, middle pressure, high pressure）, while need to provide a vapor heat exchanger（Shell-and-tube heat exchanger, full welding can be used
Plate type heat exchanger etc.）.Come self-water replenishing temperature calculator 11, calculation of Wall Temperature device 12, dew-point temperature and calculate device 13 and steam stream
The signal of transmitter 9 is admitted to steam flow regulator 14, by calculating, exports the action signal of steam flow control valve 8,
So as to realize the control of moisturizing temperature.The condensed condensate of steam is by going to public work circulation profit after steam trap 10
With.Remaining same embodiment 1.
The utility model technological process：It is pre- by entering moisturizing after filling water control system for boiler from public work boiler water
Hot device 2 preheats, the boiler replenishing water by preheating will be directed into economizer 1 carry out waste heat recovery, the boiler being heated again to
Water is sent into boiler-steam dome and produces steam.
By setting flue gas dew point sensor 3 to be sent to flue gas dew point in real time in the flue gas side outlet of economizer 1 in system
Flue gas dew point tester, tube wall temperature is monitored in real time in the heat transfer element outer wall of economizer 1 arrangement tube wall temperature sensor 4, is being mended
Water preheater outlet line sets moisturizing temperature sensor 5 to monitor moisturizing temperature in real time.Most all signals are sent into temperature control at last
Device processed carries out calculating control.
Claims (5)
1. a kind of waste heat boiler low-temperature dew point corrosion prevents and treats device, including economizer, it is characterized in that：The anti-locking apparatus includes moisturizing
Preheater（2）, the make-up water preheater（2）And economizer（1）Connection；In economizer（1）Flue gas side outlet sets flue gas dew point to pass
Sensor（3）, economizer（1）Heat transfer element outer wall arranges tube wall temperature sensor（4）；In make-up water preheater（2）Outlet line is set
Put moisturizing temperature sensor（5）；The flue gas dew point sensor（3）Connect after being connected with flue gas dew point tester with temperature controller
Connect；The tube wall temperature sensor（4）Connected after being connected with heat exchanger tube wall temperature collector with temperature controller；The moisturizing temperature
Sensor（5）Connected after being connected with moisturizing Temperature sampler with temperature controller；And temperature controller and make-up water preheater（2）Even
Connect.
2. a kind of waste heat boiler low-temperature dew point corrosion preventing and treating device according to claim 1, it is characterized in that：The moisturizing is pre-
Hot device（2）Electric heater or vapor preheater can be used.
3. a kind of waste heat boiler low-temperature dew point corrosion preventing and treating device according to claim 2, it is characterized in that：The steam is pre-
Hot device uses shell-and-tube heat exchanger or full-welding plate-type heat exchanger.
4. a kind of waste heat boiler low-temperature dew point corrosion preventing and treating device according to claim 1, it is characterized in that：The metallic walls
Temperature sensor（4）And moisturizing temperature sensor（5）Set multiple.
5. a kind of waste heat boiler low-temperature dew point corrosion preventing and treating device according to claim 1, it is characterized in that：The moisturizing is pre-
Hot device（2）And economizer（1）It is equipped with bypass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720563029.XU CN206929761U (en) | 2017-05-19 | 2017-05-19 | A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720563029.XU CN206929761U (en) | 2017-05-19 | 2017-05-19 | A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device |
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| Publication Number | Publication Date |
|---|---|
| CN206929761U true CN206929761U (en) | 2018-01-26 |
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| CN201720563029.XU Active CN206929761U (en) | 2017-05-19 | 2017-05-19 | A kind of waste heat boiler low-temperature dew point corrosion prevents and treats device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458611A (en) * | 2018-12-03 | 2019-03-12 | 西安热工研究院有限公司 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
-
2017
- 2017-05-19 CN CN201720563029.XU patent/CN206929761U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458611A (en) * | 2018-12-03 | 2019-03-12 | 西安热工研究院有限公司 | A kind of device preventing low-temperature coal economizer of boiler dew point corrosion |
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