CN212108349U - Waste heat recovery economizer system capable of automatically changing flowing direction of medium - Google Patents
Waste heat recovery economizer system capable of automatically changing flowing direction of medium Download PDFInfo
- Publication number
- CN212108349U CN212108349U CN202020817467.6U CN202020817467U CN212108349U CN 212108349 U CN212108349 U CN 212108349U CN 202020817467 U CN202020817467 U CN 202020817467U CN 212108349 U CN212108349 U CN 212108349U
- Authority
- CN
- China
- Prior art keywords
- temperature
- economizer
- temperature economizer
- low
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The utility model provides an automatic change waste heat recovery economizer system of medium flow direction. The technical scheme is that a low-temperature economizer and a high-temperature economizer are connected in series, a leading-out pipeline of an outlet header of the low-temperature economizer is connected with an outlet header of the high-temperature economizer, an electromagnetic valve is installed on the pipeline, a pipeline provided with the electromagnetic valve is further led out from the outlet header of the low-temperature economizer and connected with an original water outlet pipeline of the high-temperature economizer, and meanwhile, the electromagnetic valve is also installed on a connecting pipeline of the outlet header of the low-temperature economizer and an inlet header of the high-temperature economizer. On the basis, a digital pressure meter and a thermometer are installed on an outlet header of the low-temperature economizer, collected temperature data and pressure data are uploaded to a PLC (programmable logic controller), and the PLC determines a temperature threshold value according to the pressure data and is used as a control basis of an electromagnetic valve after being compared with the temperature data. Based on the structure, the flow direction of water in the tail-end heat exchanger can be automatically switched, the water flow force in the heat exchanger is increased, and the influence of steam resistance is eliminated.
Description
Technical Field
The utility model relates to a waste heat recovery technical field, concretely relates to automatic change waste heat recovery economizer system of medium flow direction.
Background
In the waste heat and waste pressure recovery energy-saving project, in order to improve the heat exchange efficiency of the waste heat recoverer and reduce project investment, the common method is that a heat absorbing medium and waste heat flue gas are arranged in a counter-current mode to improve the logarithmic temperature difference of heat exchange. When the waste heat flue gas flows from bottom to top, water in the waste heat recoverer adopting the countercurrent arrangement can generate phase change due to the change of load, the water flowing downwards can cause water hammer vibration to cause equipment damage due to vapor resistance formed by vaporization, in addition, oxygen dissolved in the water after the water vaporization is separated out and rises to the joint of the heating surface tube bundle and the header to be concentrated to form oxygen corrosion at the joint, and once similar operation working conditions occur, the heating surface pipeline can be corroded, perforated and leaked quickly, and even equipment shutdown accidents are caused.
Disclosure of Invention
The utility model aims at providing an automatic change medium flow direction's waste heat recovery economizer system to prior art's technical defect to solve high temperature economizer can cause equipment vibration, vapour to hinder heat transfer and worsen, economizer tube bank oxygen corrosion scheduling technical problem because of the vaporization of water.
In order to realize the technical purpose, the utility model adopts the following technical scheme:
a waste heat recovery economizer system capable of automatically changing the flowing direction of a medium comprises a low-temperature economizer, a high-temperature economizer, a low-temperature economizer outlet header, a high-temperature economizer inlet header, a high-temperature economizer outlet header, a pressure gauge, a thermometer, an electromagnetic valve and a low-temperature economizer inlet header, wherein the low-temperature economizer and the high-temperature economizer are sequentially connected in series; the outlet header of the low-temperature economizer is connected with the outlet header of the high-temperature economizer through a pipeline, and the pipeline is connected with an electromagnetic valve; the outlet header of the low-temperature economizer is connected with an original water outlet pipe of the high-temperature economizer through another pipeline, and the pipeline is connected with another electromagnetic valve; the outlet header of the low-temperature economizer is connected with the inlet header of the high-temperature economizer through another pipeline, and the pipeline is connected with another electromagnetic valve; and a pressure gauge and a thermometer are respectively arranged on the outlet header of the low-temperature economizer.
Preferably, the system further comprises a PLC controller, and the PLC controller receives data from the pressure meter and the temperature meter respectively.
Preferably, the PLC controller sends a control command to the solenoid valve.
Preferably, a temperature threshold is preset in the PLC controller.
Preferably, the temperature threshold is variable according to a pressure condition, and the temperature threshold is: the saturation temperature of water at the time pressure minus 5 ℃.
When water is heated to reach the saturation temperature under the corresponding pressure, the water is vaporized, and the steam-water mixture flows downwards to form steam resistance, so that the heat transfer of the heat exchanger is influenced, and meanwhile, the high-point pipeline of the heat exchanger is quickly corroded to cause equipment accidents. To the above problem, the utility model provides an automatic change waste heat recovery economizer system of medium flow direction. According to the technical scheme, a low-temperature economizer and a high-temperature economizer are connected in series, a pipeline is led out from an outlet header of the low-temperature economizer and is connected with an outlet header of the high-temperature economizer, an electromagnetic valve is installed on the connecting pipeline, a pipeline provided with the electromagnetic valve is led out from an outlet header of the low-temperature economizer and is connected with an original water outlet pipeline of the high-temperature economizer, and meanwhile, the electromagnetic valve is also installed on the connecting pipeline between the outlet header of the low-temperature economizer and an inlet header of the high-temperature economizer. On the basis, a digital pressure meter and a thermometer are installed on an outlet header of the low-temperature economizer, collected temperature data and pressure data are uploaded to a PLC (programmable logic controller), and the PLC determines a temperature threshold value according to the pressure data and is used as a control basis of an electromagnetic valve after being compared with the temperature data. Based on the structure, the flow direction of the water in the last section of the heat exchanger can be automatically changed from counter flow to concurrent flow according to the pressure and the temperature of the water in the heat exchanger, the flow force of the water in the heat exchanger is increased, the influence of vapor lock is eliminated, and the running safety and the service life of equipment are improved.
The utility model discloses by the water pressure temperature measurement system on two waste heat recovery economizers, the economizer header and the rivers switching-over automatic control valve on the water pipe way of intaking of economizer header constitute, waste heat recovery economizer system can in time change the rivers direction in the high temperature economizer according to the temperature and the pressure of the water in the economizer, eliminates equipment vibration, the vapor lock heat transfer that causes because of the vaporization of water worsens, economizer tube bank oxygen corrosion scheduling problem. The utility model discloses can carry out high-efficient, safe waste heat recovery in waste heat flue gas upflow occasion.
Drawings
FIG. 1 is a system connection diagram of the present invention;
in the figure:
1. low-temperature coal economizer 2, high-temperature coal economizer 3 and low-temperature coal economizer outlet header
4. An inlet header 5 of the high-temperature economizer, an outlet header 6 of the high-temperature economizer and a pressure gauge
7. A thermometer 8, an electromagnetic valve 9 and a low-temperature economizer inlet header.
Detailed Description
The following will describe in detail specific embodiments of the present invention. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
A waste heat recovery economizer system capable of automatically changing the flowing direction of a medium comprises two waste heat recovery economizers, a water pressure and temperature measuring system on an economizer header and a water flow reversing automatic control valve on a water inlet pipeline and a water outlet pipeline of the economizer header.
Two coal economizers are arranged in series, one of the two coal economizers is called as a low-temperature coal economizer, and the other coal economizer is a high-temperature coal economizer.
The system can change the direction of water flow in the high-temperature economizer, and the realization method is that a pipeline is led out from an outlet header of the low-temperature economizer and is connected with the outlet header of the high-temperature economizer, an electromagnetic valve is arranged on a connecting pipeline, in addition, a pipeline provided with the electromagnetic valve is led out from the outlet header of the low-temperature economizer and is connected with an original water outlet pipeline of the high-temperature economizer, one electromagnetic valve is also arranged on the connecting pipeline between the outlet header of the low-temperature economizer and an inlet header of the high-temperature economizer, and the electromagnetic valve is required to be noticed that the temperature of the installation environment cannot be too high, so that the safe operation of the electromagnetic valve is ensured.
This system installs digital pressure gauge and thermometer on the export header of low temperature economizer, and its temperature pressure data in service calculates through waste heat recovery system's PLC control system, and in case the temperature is close to its saturation temperature under corresponding pressure, control system can send the switching instruction: the electromagnetic valve of the pipeline connecting the low-temperature economizer outlet header and the high-temperature economizer outlet header and the electromagnetic valve from the high-temperature economizer inlet header to the high-temperature economizer outlet header are opened; the electromagnetic valve of the connecting pipeline of the low-temperature economizer outlet header and the high-temperature economizer inlet header and the electromagnetic valve of the high-temperature economizer outlet header are closed, so that water flow in the high-temperature economizer is changed into flow from bottom to top, and the problems of poor heat exchange effect and pipe bundle oxygen corrosion of the high-temperature economizer caused by vaporization vibration and vapor resistance are solved.
The installation and operation process of the system is as follows:
1. calculating the heating area of the high-low temperature economizer according to waste heat recovery field data and the load change condition of a waste heat recovery system, designing the structure and the overall dimension of the economizer according to the field space condition, and designing each connecting pipeline interface on the economizer header; and (5) processing and manufacturing.
2. And installing a pipeline system, an electromagnetic valve, a stop valve and the like according to the system design.
3. Digital temperature and pressure measuring instruments are installed on an outlet header of the low-temperature economizer, a saturation temperature digital control program under corresponding pressure is programmed on a PLC according to the temperature and pressure range of the operation of the economizer, and a water flow turning switching control point is designed according to the temperature lower than the saturation temperature by 5 ℃.
Example 2
A waste heat recovery economizer system capable of automatically changing the flow direction of a medium comprises a low-temperature economizer 1, a high-temperature economizer 2, a low-temperature economizer outlet header 3, a high-temperature economizer inlet header 4, a high-temperature economizer outlet header 5, a pressure gauge 6, a thermometer 7, an electromagnetic valve 8 and a low-temperature economizer inlet header 9, wherein the low-temperature economizer 1 and the high-temperature economizer 2 are sequentially connected in series, the low-temperature economizer inlet header 9 and the low-temperature economizer outlet header 3 are respectively arranged at the inlet end and the outlet end of the low-temperature economizer 1, and the high-temperature economizer inlet header 4 and the high-temperature economizer outlet header 5 are respectively arranged at the inlet end and the outlet end of the high-temperature economizer 2; the low-temperature economizer outlet header 3 is connected with the high-temperature economizer outlet header 5 through a pipeline, and the pipeline is connected with an electromagnetic valve 8; the outlet header 3 of the low-temperature economizer is connected with the original water outlet pipe of the high-temperature economizer 2 through another pipeline, and the pipeline is connected with another electromagnetic valve 8; the outlet header 3 of the low-temperature economizer is connected with the inlet header 4 of the high-temperature economizer through another pipeline, and the pipeline is connected with another electromagnetic valve 8; a pressure gauge 6 and a thermometer 7 are respectively arranged on the outlet header 3 of the low-temperature economizer. Meanwhile, the temperature and humidity measuring device further comprises a PLC controller, and the PLC controller receives data from the pressure gauge 6 and the thermometer 7 respectively. The PLC controller sends a control instruction to the solenoid valve 8. And a temperature threshold value is preset in the PLC. The temperature threshold value takes a pressure condition as a variable, and is as follows: the saturation temperature of water at the time pressure minus 5 ℃.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, and improvement made within the scope of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A waste heat recovery economizer system capable of automatically changing the flowing direction of a medium is characterized by comprising a low-temperature economizer (1), a high-temperature economizer (2), a low-temperature economizer outlet header (3), a high-temperature economizer inlet header (4), a high-temperature economizer outlet header (5), a pressure gauge (6), a thermometer (7), an electromagnetic valve (8) and a low-temperature economizer inlet header (9), wherein the low-temperature economizer (1) and the high-temperature economizer (2) are sequentially connected in series, the inlet end and the outlet end of the low-temperature economizer (1) are respectively provided with the low-temperature economizer inlet header (9) and the low-temperature economizer outlet header (3), and the inlet end and the outlet end of the high-temperature economizer (2) are respectively provided with the high-temperature economizer inlet header (4) and the high-temperature economizer outlet header (5); the outlet header (3) of the low-temperature economizer is connected with the outlet header (5) of the high-temperature economizer through a pipeline, and the pipeline is connected with an electromagnetic valve (8); the outlet header (3) of the low-temperature economizer is connected with the original water outlet pipe of the high-temperature economizer (2) through another pipeline, and the pipeline is connected with another electromagnetic valve (8); the outlet header (3) of the low-temperature economizer is connected with the inlet header (4) of the high-temperature economizer through another pipeline, and the pipeline is connected with another electromagnetic valve (8); a pressure gauge (6) and a thermometer (7) are respectively arranged on the outlet header (3) of the low-temperature economizer.
2. The waste heat recovery economizer system for automatically changing the flow direction of a medium as claimed in claim 1 further comprising a PLC controller receiving data from the pressure gauge (6) and the temperature gauge (7), respectively.
3. The waste heat recovery economizer system for automatically changing the flow direction of a medium as claimed in claim 2, characterized in that the PLC controller sends a control command to the solenoid valve (8).
4. The waste heat recovery economizer system with automatic media flow direction changing function of claim 3 wherein the PLC controller is preset with a temperature threshold.
5. The waste heat recovery economizer system that automatically changes media flow direction of claim 4 wherein the temperature threshold is variable in pressure conditions, the temperature threshold is: the saturation temperature of water at the time pressure minus 5 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020817467.6U CN212108349U (en) | 2020-05-17 | 2020-05-17 | Waste heat recovery economizer system capable of automatically changing flowing direction of medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020817467.6U CN212108349U (en) | 2020-05-17 | 2020-05-17 | Waste heat recovery economizer system capable of automatically changing flowing direction of medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212108349U true CN212108349U (en) | 2020-12-08 |
Family
ID=73622965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020817467.6U Active CN212108349U (en) | 2020-05-17 | 2020-05-17 | Waste heat recovery economizer system capable of automatically changing flowing direction of medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212108349U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339778A (en) * | 2021-07-06 | 2021-09-03 | 华能安源发电有限责任公司 | Low-low-temperature economizer device with intermediate header |
-
2020
- 2020-05-17 CN CN202020817467.6U patent/CN212108349U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339778A (en) * | 2021-07-06 | 2021-09-03 | 华能安源发电有限责任公司 | Low-low-temperature economizer device with intermediate header |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205014330U (en) | Modular economizer residual heat from flue gas device and residual heat from flue gas system | |
| CN202074880U (en) | Automatic control system used in acid resistant dew point corrosion of a boiler smoke evacuation heat recovery heat exchanger | |
| CN202032927U (en) | Independent-control phase-change heat exchange system | |
| CN212108349U (en) | Waste heat recovery economizer system capable of automatically changing flowing direction of medium | |
| CN112594664A (en) | Intelligent hydrophobic steam-air preheater system and automatic control method thereof | |
| CN202675257U (en) | Boiler flue gas afterheat recycling system | |
| CN102620583A (en) | Sub-control phase change heat transfer system and sub-control phase change heat transfer method | |
| CN103994458B (en) | Complex phase-change heat exchanger suitable in fired power generating unit | |
| CN103900410B (en) | A kind of phase change heat exchange device and heat-exchange method thereof | |
| CN105841180A (en) | Horizontal type phase change smoke waste heat recovering and double-effect heating system and control method thereof | |
| CN205388305U (en) | Novel low temperature second grade economizer | |
| CN205607235U (en) | Hot media water tubular heat exchanger control system | |
| CN203869018U (en) | Heat pipe type low-temperature flue gas waste heat recovery device for coal-fired power plant | |
| TWM502817U (en) | Intelligent constant temperature heat exchanger | |
| CN215411832U (en) | Composite hot water recirculation system for full-load denitration of supercritical power station boiler | |
| CN102889611B (en) | Controllable exhaust gas temperature sub-control phase change air preheating system and preheating method | |
| CN101441049B (en) | Anti-low-temperature corrosion system and method of heat exchanger based on fuel characteristic | |
| WO2008121689A2 (en) | Water recirculation system for power plant backend gas temperature control | |
| CN102721037A (en) | Boiler flue gas waste heat recovery system and control method thereof | |
| CN212565840U (en) | Accurate control system of phase change heat exchanger working medium side temperature | |
| CN108443861B (en) | Energy-saving device for eliminating back pressure of closed condensate water recovery system | |
| CN205208602U (en) | Modular intelligence phase transition heat transfer device | |
| CN107676841B (en) | Flue gas waste heat recovery method for heating heat supply network water with different pressures | |
| CN207849346U (en) | Utilize the Steam Turbine Regenerative System of medium temperature flue gas condensed water | |
| CN111853845A (en) | Accurate control system of phase change heat exchanger working medium side temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |