CN103486898B - The automatic safety-control device of industrial afterheat recovery system - Google Patents
The automatic safety-control device of industrial afterheat recovery system Download PDFInfo
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- CN103486898B CN103486898B CN201310416323.4A CN201310416323A CN103486898B CN 103486898 B CN103486898 B CN 103486898B CN 201310416323 A CN201310416323 A CN 201310416323A CN 103486898 B CN103486898 B CN 103486898B
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Abstract
The invention provides a kind of automatic safety-control device of industrial afterheat recovery system.This automatic safety-control device is based on industrial afterheat recovery system, on heat pipe type heat exchanger, mounting temperature sensor is respectively used to the temperature measuring heat collector surface, the heat-obtaining amount of temperature sensor measurement whole system is installed in the import and export of condenser, on condenser, setting pressure sensor carrys out the pressure of measuring system internal working medium, the signal of the sensor is input to control system, by working medium quantity in control system realize industrial exhaust heat safe, effectively utilize.
Description
Technical field
The present invention relates to automation field, particularly relate to a kind of automatic safety-control device of industrial afterheat recovery system.
Background technology
Industrial exhaust heat is prevalent in the industries such as electric power, metallurgy, chemical industry, and its boiler tail flue gas contains huge heat, so how to be taken out and to make full use of the above-mentioned energy by the heat in flue gas is one of main research of energy-saving and emission-reduction.High efficient heat exchanging mode during current industrial exhaust heat utilizes mainly comprises following two kinds: heat exchanger direct heat transfer and heat exchange of heat pipe.For heat exchanger direct heat transfer mode, owing to being that heated material directly carries out heat exchange with flue gas, the temperature difference comparatively greatly, easily causes heat exchanger surface to corrode, has a strong impact on the life-span of heat exchanger.
The more waste heat recovery mode of current application is heat exchange of heat pipe, because heat pipe adopts the principle of Working fluid phase changing to carry out heat exchange, therefore effectively can ensure that the surface temperature of heat exchanger maintains more than the dew-point temperature of flue gas, overcome the dew point corrosion problem of flue gas.
But, in the industrial afterheat recovery system of existing employing heat exchange of heat pipe, after the structure of heat exchange of heat pipe determines, its heat exchange amount is difficult to change heat demand adjustment according to system, and when thermic load generation big ups and downs, heat exchange of heat pipe inside can produce very large thermal stress and even bursts.
Summary of the invention
(1) technical problem that will solve
In view of above-mentioned technical problem, the invention provides a kind of automatic safety-control device of industrial afterheat recovery system, to promote the security of industrial afterheat recovery system.
(2) technical scheme
According to an aspect of the present invention, a kind of automatic safety-control device of industrial afterheat recovery system is provided.This industrial afterheat recovery system comprises: heat pipe type heat exchanger (100); Condenser (200), its steam inlet is connected by the steam (vapor) outlet of steam pipework with heat pipe type heat exchanger (100), the outlet of its condensation water is connected to the condensation water entrance of heat pipe type heat exchanger (100) by liquid back pipe road, its exhaust outlet is communicated to the external world; Water pump (300), it is got liquid end and is connected to working medium liquid pool (700), and its outlet end is connected to the fluid infusion mouth of condenser.This automatic safety-control device comprises: pressure sensor (601), is arranged in condenser (200), for measuring the inner pressure of condenser (200); Vent valve (603) is magnetic valve, is arranged between described condenser working medium outlet and external environment; Control device (500), be connected to described pressure sensor (601), for performing following control flow: when the numerical value that pressure sensor (601) is responded to is more than the 3rd threshold value, sending instruction and steam escape valve (603) is opened.
(3) beneficial effect
As can be seen from technique scheme, the automatic safety-control device of industrial afterheat recovery system of the present invention has following beneficial effect:
(1) pressure sensor is set in condenser, when pressure arrives predetermined threshold value, control device sends instruction makes steam escape valve (603) open, thus make the pressure in condenser remain on level of security, when avoiding the generation big ups and downs of user's thermic load, heat exchange of heat pipe is inner can produce very large power pressure and thermal stress, and the danger of explosion occurs residual neat recovering system;
(2) at the import and export of condenser 200, the heat that temperature sensor reclaims for residual neat recovering system is installed, the quantity of the waste heat recovery volume of contrast residual heat system and inner two matter of the heat demand amount adjustment System of user, thus change the heat exchange amount of whole system, when further avoid the generation big ups and downs of user's thermic load, heat exchange of heat pipe is inner can produce very large power pressure and thermal stress, and the danger of explosion occurs residual neat recovering system;
(2) temperature of temperature sensor for the temperature and flue gas of measuring heat collector outer surface is installed in the outside of residual neat recovering system heat collector 100, and the temperature on residual neat recovering system heat collector surface is controlled by control device, ensure that the hull-skin temperature of heat collector is higher than the dew-point temperature of flue gas, overcomes heat transmission equipment dew point corrosion problem common in existing residual neat recovering system.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment of the present invention industrial afterheat recovery system.
[main element symbol description of the present invention]
100-heat pipe type heat exchanger; 200-condenser;
300-water pump; 401-first temperature sensor;
402-second temperature sensor; 403-three-temperature sensor;
500-control device; 601-pressure sensor;
602-liquid feed valve; 603-vent valve;
700-working medium liquid pool.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.It should be noted that, in accompanying drawing or description describe, similar or identical part all uses identical figure number.The implementation not illustrating in accompanying drawing or describe is form known to a person of ordinary skill in the art in art.In addition, although herein can providing package containing the demonstration of the parameter of particular value, should be appreciated that, parameter without the need to definitely equaling corresponding value, but can be similar to corresponding value in acceptable error margin or design constraint.The direction term mentioned in embodiment, such as " on ", D score, "front", "rear", "left", "right" etc., be only the direction with reference to accompanying drawing.Therefore, the direction term of use is used to illustrate and is not used for limiting the scope of the invention.
The invention provides a kind of automatic safety-control device of industrial afterheat recovery system.In this automatic safety-control device, on heat collector, mounting temperature sensor is respectively used to the temperature measuring heat collector surface, the heat-obtaining amount of temperature sensor measurement whole system is installed in the import and export of condenser, on condenser, setting pressure sensor carrys out the pressure of measuring system internal working medium, the signal of the sensor is input to PLC control system, in control system two prime number amounts realize two amateurish heat safe, effectively utilize.
In one exemplary embodiment of the present invention, provide a kind of automatic safety-control device.Please refer to Fig. 1, this automatic safety-control device is based on the industrial afterheat recovery system comprising heat pipe type heat exchanger 100, condenser 200 and water pump 300.
Heat pipe type heat exchanger 100 is made up of the heat-obtaining plate that polylith is identical, and heat-obtaining plate quantity is determined by required thermic load.Every block heat-obtaining plate surface is with fin as expansion heat-transfer surface, and expansion heat-transfer surface has ripple on the surface, and the disturbance of surveying for increasing flue gas improves convection transfer rate, increases the heat exchange area getting hotplate surface simultaneously.The inner surface of heat-obtaining intralamellar part cavity is carved with micro channels for strengthening the heat exchange of heat collector inside.
Condenser 200, its steam inlet end is connected with heat pipe type heat exchanger 100 by steam pipework, and the outlet of its condensation water is transmitted back to the condensation water entrance of heat pipe type heat exchanger by liquid back pipe road; Its exhaust outlet is communicated to the external world.Steam hose between condenser 200 and heat collector 100 and liquid back pipe road are metal hose, facilitate the layout of heat collector and condenser.Condenser becomes different version according to the different designs of heating object material
Water pump 300, it is got liquid end and is connected to working medium liquid pool 700, and its outlet end is connected to the fluid infusion mouth of condenser 200, in the working medium quantity needing increase system heat-obtaining amount replenishment system inside.
Heat pipe type heat exchanger 100 absorbs heat from flue gas, and the liquid refrigerant ordering about its inside undergoes phase transition, and becomes steam.This steam is delivered to condenser 200 by steam pipework.Condenser 200 utilizes the heat heated material carried in steam, meanwhile, is condensed into liquid refrigerant after steam release heat.This liquid refrigerant is back to heat pipe heat collector 100 by liquid back pipe road.
This automatic safety-control device comprises: sets of temperature sensors, PLC control device 500, pressure sensor 601, liquid feed valve 602 and vent valve 603.Below respectively each part of the present embodiment industrial afterheat recovery system is described in detail.
Sets of temperature sensors, comprises several temperature sensors, wherein: the first temperature sensor 401, is arranged at outside heat pipe type heat exchanger outer surface, for detecting the temperature of heat pipe type heat exchanger 100 place environment flue gas; Second temperature sensor 402, is arranged at the outer surface of heat pipe type heat exchanger, for detecting the temperature on heat collector surface; Three-temperature sensor 403, is arranged at the outer surface of outside condenser arrival end, for measuring the temperature of outside condenser arrival end outer surface; Three-temperature sensor 404, is arranged at the outer surface of the outside condenser port of export, for measuring the temperature of outside condenser port of export outer surface;
Pressure sensor 601, is arranged in condenser 200, for measuring the pressure of condenser inside.Vent valve 603 is magnetic valve, is arranged between described condenser working medium outlet and external environment, for reducing the working medium quantity of industrial afterheat recovery internal system when needing to reduce residual neat recovering system heat-obtaining amount.Liquid feed valve 602, is arranged between the outlet end of water pump 300 and condenser working medium inlet, for increasing the working medium quantity of industrial afterheat recovery internal system in case of need.
PLC control device 500 is connected to described first temperature sensor 401, second temperature sensor 402, three-temperature sensor 403 and pressure sensor 601 by wired or wireless mode, by the signal of the sensor, the switch of the liquid feed valve 602 of water pump 300, water pump and the steam escape valve 603 of condenser in control system, reach regulating system heat exchange amount, prevent surface from the object of dew point corrosion and system explosion occurring, its control flow comprises:
(1) when the temperature value responded to when the first temperature sensor 401 is greater than setting first threshold, show that flue-gas temperature is higher, heat can be extracted from flue gas, now sending instruction makes water pump 300, liquid feed valve 602, steam escape valve 603 open, and residual neat recovering system is filled to the distilled water of some.Then sending instruction makes water pump 300 and liquid feed valve 602 close, and keeps steam escape valve 302 to be in open mode, after incoagulable gas is substantially drained, sends instruction and makes steam escape valve 60 close 3.Now system enters beginning waste heat recovery, and wherein, this first threshold is generally set as 50 DEG C;
(2) when the temperature value of the second temperature sensor 402 induction and the difference of flue gas dew point temperature are less than Second Threshold, sending instruction makes steam escape valve 603 open, reduce the working medium quantity of industrial afterheat recovery internal system, thus reduce the heat-obtaining amount of system, prevent the dew point corrosion on heat-obtaining heat collector surface, wherein, this Second Threshold is generally set as 10 DEG C;
(3) when the temperature value of the second temperature sensor 402 induction and the difference of flue gas dew point temperature are greater than the 3rd threshold value, sending instruction makes water pump 300 and liquid feed valve 602 open, and increases the quantity of internal system working medium, increases the heat exchange amount of system, wherein, the 3rd threshold value is generally set as 40 DEG C;
(4) when pressure sensor 601 respond to numerical value more than the 3rd threshold value time, send instruction steam escape valve 603 is opened, guarantee the safety of system, wherein, the 3rd threshold value is generally set as 80% of the maximum pressure value that industrial afterheat recovery system can bear.
(5) when the temperature difference of three-temperature sensor 403 and the 4th temperature sensor 404 is less than the 4th threshold value, sending instruction makes water pump 300 and liquid feed valve 602 open, increase the quantity of internal system working medium to increase the heat exchange amount of system, wherein, 4th threshold value depends on the demand for heat to material in condenser, such as, need material from ambient temperature 50 DEG C.
It should be noted that, above-mentioned each control flow is proper precedence relationship not, wherein according to circumstances selects one and performs.
So far, by reference to the accompanying drawings the present embodiment has been described in detail.Describe according to above, those skilled in the art should have industrial afterheat recovery system of the present invention and have clearly been familiar with.
In addition, the above-mentioned definition to each element is not limited in the various concrete structure or shape mentioned in embodiment, and those of ordinary skill in the art can replace it with knowing simply, such as:
(1) the working medium distilled water used in residual neat recovering system at present can also change into other latent heats of vaporization large, be easy to obtain working medium;
(2) PLC control system can adopt other control system to substitute;
(3) value of first threshold, Second Threshold, the 3rd threshold value and the 4th threshold value can be carried out rationally to arrange as required.
In sum, it is non-adjustable that industrial afterheat recovery system of the present invention solves the dew point corrosion, the heat exchange amount that exist in existing residual neat recovering system, and during heat exchange amount generation acute variation, produce the technological deficiency of explosion, the temperature that can control heat collector surface prevents lower than dew point, heat-obtaining amount is controlled by the temperature measuring flue gas, prevent system pressure too high, greatly improve security and the efficiency of industrial afterheat recovery.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an automatic safety-control device for industrial afterheat recovery system, this industrial afterheat recovery system comprises:
Heat pipe type heat exchanger (100);
Condenser (200), its steam inlet is connected by the steam (vapor) outlet of steam pipework with heat pipe type heat exchanger (100), the outlet of its condensation water is connected to the condensation water entrance of heat pipe type heat exchanger (100) by liquid back pipe road, its exhaust outlet is communicated to the external world;
Water pump (300), it is got liquid end and is connected to working medium liquid pool (700), and its outlet end is connected to the fluid infusion mouth of condenser;
It is characterized in that, this automatic safety-control device comprises:
Pressure sensor (601), is arranged in condenser (200), for measuring the inner pressure of condenser (200);
Steam escape valve (603) is magnetic valve, is arranged between described condenser working medium outlet and external environment;
Control device (500), be connected to described pressure sensor (601), for performing following control flow: when the numerical value that pressure sensor (601) is responded to is more than the 3rd pressure threshold, sending instruction and steam escape valve (603) is opened.
2. automatic safety-control device according to claim 1, is characterized in that, described 3rd pressure threshold is 80% of the maximum pressure value that described industrial afterheat recovery system can bear.
3. automatic safety-control device according to claim 1, is characterized in that, also comprises:
Sets of temperature sensors, comprising:
Second temperature sensor (402), is arranged at the outer surface of described heat pipe type heat exchanger (100), for detecting the temperature on heat pipe heat collector (100) surface;
Liquid feed valve (602) is magnetic valve, is arranged between the outlet end of described water pump and condenser working medium inlet;
Described control device (500), be connected to described second temperature sensor (402), for performing following control flow: when the difference of the temperature value that the second temperature sensor (402) is responded to and flue gas dew point temperature is less than the second temperature threshold, sending instruction and steam escape valve (603) is opened; Or when the difference of the temperature value that the second temperature sensor (402) is responded to and flue gas dew point temperature is greater than the 3rd temperature threshold, sends instruction and water pump (300) and liquid feed valve (602) are opened.
4. automatic safety-control device according to claim 3, is characterized in that, described second temperature threshold is 10 DEG C.
5. automatic safety-control device according to claim 3, is characterized in that:
Described sets of temperature sensors also comprises: three-temperature sensor (403), is arranged at the outer surface of outside condenser arrival end, for measuring the temperature of outside condenser arrival end outer surface; 4th temperature sensor (404), is arranged at the outer surface of the outside condenser port of export, for measuring the temperature of outside condenser port of export outer surface;
Described control device (500), be connected to described three-temperature sensor (403) and the 4th temperature sensor (404), also for performing following control flow: when the temperature difference of three-temperature sensor (403) and the 4th temperature sensor (404) is less than the 4th temperature threshold, sending instruction and water pump (300) and liquid feed valve (602) are opened.
6. automatic safety-control device according to claim 5, is characterized in that, described 4th temperature threshold depends on the demand for heat to material in condenser.
7. automatic safety-control device according to claim 5, is characterized in that:
Described sets of temperature sensors also comprises: the first temperature sensor (401), is arranged at outside heat pipe type heat exchanger outer surface, for detecting the temperature of heat pipe type heat exchanger (100) place environment flue gas;
Described control device (500), be connected to described first temperature sensor (401), for performing following control flow: when the temperature value that the first temperature sensor (401) is responded to is greater than setting the first temperature threshold, sending instruction and water pump (300), liquid feed valve (602) and steam escape valve (603) are opened; Then sending instruction makes water pump (300) and liquid feed valve (602) close, and keeps steam escape valve (302) to be in open mode, after incoagulable gas is substantially drained, sends instruction and steam escape valve (603) cuts out.
8. automatic safety-control device according to claim 7, is characterized in that, described first temperature threshold is 50 DEG C.
9. automatic safety-control device according to any one of claim 1 to 8, is characterized in that:
Described heat pipe type heat exchanger (100) is made up of the heat-obtaining plate that polylith is identical, and every block heat-obtaining plate surface is with fin as expansion heat-transfer surface, and expansion heat-transfer surface has ripple on the surface.
10. automatic safety-control device according to any one of claim 1 to 8, is characterized in that: described working medium is distilled water.
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| CN201310416323.4A CN103486898B (en) | 2013-09-13 | 2013-09-13 | The automatic safety-control device of industrial afterheat recovery system |
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| CN201310416323.4A CN103486898B (en) | 2013-09-13 | 2013-09-13 | The automatic safety-control device of industrial afterheat recovery system |
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| CN103486898B true CN103486898B (en) | 2015-10-21 |
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| CN105806111B (en) * | 2014-12-31 | 2018-01-05 | 亚申科技研发中心（上海）有限公司 | A kind of heat-exchange system based on super thermal conduction principle |
| CN104728826A (en) * | 2015-03-19 | 2015-06-24 | 中国华能集团清洁能源技术研究院有限公司 | Constant temperature economizer |
| CN109341388B (en) * | 2018-12-20 | 2020-08-18 | 江苏广旭热管科技有限公司 | Plate type pulsating heat pipe heat exchanger capable of exchanging heat in two directions |
Citations (5)
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|---|---|---|---|---|
| JPH0821698A (en) * | 1994-04-07 | 1996-01-23 | Tetsuji Yoshinaga | Exhaust heat recovering apparatus with circulating circuit |
| CN2716761Y (en) * | 2004-04-02 | 2005-08-10 | 天津力源永春科技发展有限公司 | Intellectualized controller for heat exchanging machine set |
| CN201314797Y (en) * | 2008-12-03 | 2009-09-23 | 沈阳铝镁设计研究院 | Waste heat recovery device and control system thereof |
| JP2012207833A (en) * | 2011-03-29 | 2012-10-25 | Kurita Water Ind Ltd | Method of estimating cleaning effect of cooling water line in refrigerating system |
| CN103016137A (en) * | 2011-09-21 | 2013-04-03 | 株式会社丰田自动织机 | Waste heat recovery system |
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2013
- 2013-09-13 CN CN201310416323.4A patent/CN103486898B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0821698A (en) * | 1994-04-07 | 1996-01-23 | Tetsuji Yoshinaga | Exhaust heat recovering apparatus with circulating circuit |
| CN2716761Y (en) * | 2004-04-02 | 2005-08-10 | 天津力源永春科技发展有限公司 | Intellectualized controller for heat exchanging machine set |
| CN201314797Y (en) * | 2008-12-03 | 2009-09-23 | 沈阳铝镁设计研究院 | Waste heat recovery device and control system thereof |
| JP2012207833A (en) * | 2011-03-29 | 2012-10-25 | Kurita Water Ind Ltd | Method of estimating cleaning effect of cooling water line in refrigerating system |
| CN103016137A (en) * | 2011-09-21 | 2013-04-03 | 株式会社丰田自动织机 | Waste heat recovery system |
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