CN210398858U - Dew point corrosion prevention waste heat recovery system - Google Patents
Dew point corrosion prevention waste heat recovery system Download PDFInfo
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- CN210398858U CN210398858U CN201920538901.4U CN201920538901U CN210398858U CN 210398858 U CN210398858 U CN 210398858U CN 201920538901 U CN201920538901 U CN 201920538901U CN 210398858 U CN210398858 U CN 210398858U
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- dew point
- flue
- waste heat
- heat recovery
- feed water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
A dew point corrosion prevention waste heat recovery system comprises a flue, wherein a steam superheater, an evaporator and an economizer which are communicated with each other are sequentially arranged in the flue from high temperature to low temperature, and a feed water preheater and the economizer which are arranged outside the flue are communicated; the dew point corrosion prevention control system is arranged between the economizer and the feed water preheater. The utility model discloses reduce exhaust gas temperature and improve waste heat recovery efficiency simultaneously, because the flue gas temperature is lower when the solving device is started and stopped, the problem of dew point corrosion takes place easily for flue low temperature section equipment is the ideal substitute product of current natural gas purifier tail gas incinerator waste heat recovery system.
Description
Technical Field
The utility model belongs to the technical field of waste heat recovery, a prevent corrosion of dew point waste heat recovery system is related to, this utility model can be applied to various flue gas waste heat recovery occasions that contain sulphur, oxygen, nitrogen.
Background
At the tail end of the high-sulfur natural gas purification treatment device, a large-scale tail gas incinerator waste heat recovery system is installed, harmful gases such as sulfur dioxide in tail gas after natural gas purification are decomposed and purified finally, smoke waste heat recovery is achieved, and energy is saved and emission is up to standard. The domestic natural gas purification plant mostly adopts an imported tail gas incinerator waste heat recovery system which mainly comprises a steam superheater and an evaporator, and the system is found in the running process that NO is contained in smoke under the conditions of start-stop of the device and operation fluctuationX、H2S、SO3Equal corrosive component, system flue gas outlet section smokeThe temperature is low, acid dew point corrosion is easy to occur, equipment leakage occurs in serious cases, the service life of the equipment is shortened, the energy conservation and emission reduction of the device are influenced, and the environmental protection requirement cannot be met.
In addition, the waste heat recovery system of the tail gas incinerator of the imported natural gas purifying device only has the defects of high exhaust gas temperature, poor system operation flexibility and the like due to the fact that heat is taken by the steam superheater and the evaporator.
SUMMERY OF THE UTILITY MODEL
For overcoming the defects and shortcomings of the waste heat recovery system of the tail gas incinerator of the existing natural gas purification device: the utility model provides a waste heat recovery system with prevent dew point corrosion control system, acid dew point corrosion takes place easily when exhaust gas temperature is high, system operation flexibility is poor, open and shut down and system fluctuation.
The utility model adopts the technical proposal that:
a dew point corrosion prevention waste heat recovery system comprises a flue, wherein a steam superheater, an evaporator and an economizer which are communicated with each other are sequentially arranged in the flue from high temperature to low temperature, and a feed water preheater and the economizer which are arranged outside the flue are communicated; the dew point corrosion prevention control system is arranged between the economizer and the feed water preheater.
The dew point corrosion prevention control system comprises a flue gas dew point temperature detector, a heat exchange tube wall temperature detector and a temperature controller; the flue gas dew point temperature detector is arranged at the outlet section of the flue, the heat exchange tube wall temperature detector is arranged on the tube wall of the heat exchange tube of the economizer, and the temperature controller is electrically connected with the flue gas dew point temperature detector, the heat exchange tube wall temperature detector and the feed water preheater.
The utility model discloses compare with current waste heat recovery system, increase feedwater preheater and prevent dew point corrosion control system, when guaranteeing that the system equipment safe operation, reduced the exhanst gas outlet temperature, improved flue gas waste heat recovery efficiency, practiced thrift whole device energy consumption.
The utility model discloses the exhaust gas temperature is low, and system operation is nimble, reaches the fume emission index and can effectively prevent the section of discharging fume simultaneously and take place acid dew point corrosion, and guarantee natural gas purifier is stable, safe, long period running.
Drawings
FIG. 1 is a block diagram of the system flow when the feed water preheater of the present invention employs steam heating;
FIG. 2 is a block diagram of the system flow of the water pre-heater of the present invention using electric heating.
Detailed Description
The present invention will be further explained below by way of examples, but the present invention is not limited to the following examples.
Embodiment 1, refer to fig. 1, it adopts the dew point corrosion prevention waste heat recovery system flow block diagram of steam heating for the feedwater preheater, the utility model discloses install behind the natural gas purification device tail gas incinerator for tail gas incinerator flue gas waste heat recovery. The system comprises: the system comprises a flue 1, a steam superheater 2, an evaporator 3, an economizer 4, a feed water preheater 5 and a dew point corrosion prevention control system 6.
The flow of boiler feed water passing through the system sequentially comprises a feed water preheater 5, an economizer 4, an evaporator 3 and a steam superheater 2, wherein the boiler feed water in the feed water preheater 5 and the economizer 4 is preheated from the feed water temperature to the feed water saturation temperature, the saturated boiler feed water is evaporated into saturated steam in the evaporator 3, and finally the saturated steam is superheated into superheated steam meeting the conveying requirement through the steam superheater 2.
The flue gas passes through the steam superheater 2, the evaporator 3 and the economizer 4 in the flue 1 in sequence, and is changed into low-temperature flue gas meeting the emission requirement from high-temperature flue gas through heat exchange with saturated steam, saturated boiler feed water and boiler feed water in the heat exchange tube bundle.
The steam superheater 2, the evaporator 3 and the economizer 4 are vertically arranged in the flue 1, and the evaporator 3 mainly comprises a liquid drum 301 and a liquid drum 303 which are arranged at the upper end and the lower end of an evaporation tube bundle 302. The material selection of the equipment is comprehensively considered according to the composition and the temperature of the flue gas.
The utility model discloses when guaranteeing the system equipment safe operation, reduced the exhanst gas outlet temperature, improved flue gas waste heat recovery efficiency, practiced thrift whole device energy consumption.
The flue gas at the outlet of the tail gas incinerator has complex components and is at low temperature of a waste heat recovery systemSegment presence of NOX、H2S、SO3And coupling multiple corrosion conditions. The utility model discloses the precondition of retrieving the flue gas waste heat is that the acid dew point corrosion does not appear in guarantee system low temperature section equipment. A dew point corrosion prevention control system 6 is provided between the economizer 4 and the feedwater preheater 5. The dew point corrosion prevention control system 6 is composed of a heat exchange tube wall temperature detector 601, a flue gas dew point temperature detector 602 and a temperature controller 603. The flue gas dew point temperature detector 602 is arranged at the outlet section of the flue 1, and the heat exchange tube wall temperature detector 601 is arranged on the tube wall of the heat exchange tube of the economizer 4. The temperature controller 603 can be implemented by simple software programming in a conventional industrial control system, which can be DCS or PLC. The temperature controller 603 can record and monitor the dew point temperature, and can monitor the metal wall temperature of the heat transfer element and the water supply temperature on line. The temperature controller 603 specifically compares detection results transmitted by the heat exchange tube wall temperature detector 601 and the flue gas dew point temperature detector 602 in real time, if the wall temperature of the heat exchange tube is lower than the flue gas dew point temperature, the possibility of dew point corrosion can occur, and at the moment, the temperature controller 603 ensures that the wall temperature of the heat exchange tube of the economizer is 5-10 ℃ higher than the acid dew point temperature by adjusting the opening of a steam inlet valve of the feed water preheater 5, so as to prevent the acid dew point corrosion phenomenon of the part of equipment, and ensure long-term, safe and stable operation of the device.
Example 2, refer to fig. 2, which is a flow diagram of an electrothermal dew point corrosion prevention waste heat recovery system for a feed water preheater, and the main difference between this embodiment and the dew point corrosion prevention waste heat recovery system for the feed water preheater using steam heating is: the temperature controller 603 adjusts the heating electric power of the feed water preheater 5 according to the detection results transmitted by the heat exchange tube wall temperature detector 601 and the flue gas dew point temperature detector 602, so as to ensure that the wall temperature of the heat exchange tube of the economizer 5 is 5-10 ℃ higher than the acid dew point temperature, and prevent the economizer 5 and the low temperature section of the flue 1 from generating acid dew point corrosion. The rest is the same as example 1.
Claims (3)
1. The dew point corrosion prevention waste heat recovery system comprises a flue, and is characterized in that a steam superheater (2), an evaporator (3) and an economizer (4) which are communicated with each other are sequentially arranged in the flue (1) from high temperature to low temperature, and a feed water preheater (5) and the economizer (4) which are arranged outside the flue (1) are communicated with each other; the dew point corrosion prevention control system (6) is arranged between the economizer (4) and the feed water preheater (5).
2. The dew point corrosion prevention waste heat recovery system of claim 1, wherein: the dew point corrosion prevention control system comprises a flue gas dew point temperature detector (602), a heat exchange tube wall temperature detector (601) and a temperature controller (603); the flue gas dew point temperature detector (602) is arranged at the outlet section of the flue (1), the heat exchange tube wall temperature detector (601) is arranged on the tube wall of the heat exchange tube of the economizer (4), and the temperature controller (603) is electrically connected with the flue gas dew point temperature detector (602), the heat exchange tube wall temperature detector (601) and the feed water preheater (5).
3. The dew point corrosion prevention waste heat recovery system of claim 1, wherein: the feed water preheater (5) is an electric heating feed water preheater or a steam heating feed water preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920538901.4U CN210398858U (en) | 2019-04-19 | 2019-04-19 | Dew point corrosion prevention waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920538901.4U CN210398858U (en) | 2019-04-19 | 2019-04-19 | Dew point corrosion prevention waste heat recovery system |
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| Publication Number | Publication Date |
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| CN210398858U true CN210398858U (en) | 2020-04-24 |
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| CN201920538901.4U Active CN210398858U (en) | 2019-04-19 | 2019-04-19 | Dew point corrosion prevention waste heat recovery system |
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| CN (1) | CN210398858U (en) |
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2019
- 2019-04-19 CN CN201920538901.4U patent/CN210398858U/en active Active
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