CN201764488U - Low pressure coal saving device with automatic temperature control system - Google Patents
Low pressure coal saving device with automatic temperature control system Download PDFInfo
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- CN201764488U CN201764488U CN2010205158945U CN201020515894U CN201764488U CN 201764488 U CN201764488 U CN 201764488U CN 2010205158945 U CN2010205158945 U CN 2010205158945U CN 201020515894 U CN201020515894 U CN 201020515894U CN 201764488 U CN201764488 U CN 201764488U
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Abstract
The utility model discloses a low pressure coal saving device with an automatic temperature control system, which comprises a low pressure coal saving device body and an energy-saving circulating system configured therewith, wherein, the energy-saving circulating system comprises a steam turbine back heating system having a main condensed water pipe, and a low temperature water supply pipe, a high temperature water supply pipe and a main backwater pipe which are leaded from the main condensed water pipe, wherein, the low temperature water supply pipe and the high temperature water supply pipe are provided with first electromagnetic regulation valves respectively and are connected to an inlet container of the low pressure coal saving device body after forming the main water supply pipe in parallel, the main backwater pipe is connected to an outlet container of the low pressure coal saving device body; wherein, the main water supply pipe is provided with a first temperature detection device connected to a control device for outputting a first control signal, a control port of the control device is connected with the first electromagnetic regulation valves. The scheme of the utility model is safe and reliable, and can greatly reduce the flue discharging temperature of the boiler.
Description
Technical field
The utility model relates to a kind of low-pressure coal saver that has automatic temperature control system, specifically be the low-pressure coal saver that is applied to power-plant flue gas waste heat recovery, the energy-saving and cost-reducing system of the flue gas desulphurization island degree of depth or other industrial smoke UTILIZATION OF VESIDUAL HEAT IN, belong to field of energy-saving technology.
Background technology
Energy crisis is serious day by day along with industrial expansion, causes energy prices constantly to raise, and power plant has higher requirement to energy-saving and cost-reducing, and making full use of fume afterheat becomes energy-conservation effective way.Low-pressure coal saver has its unique advantage as a kind of flue gas waste heat recovery apparatus, and low-pressure coal saver utilizes main condensate to absorb fume afterheat, not only realizes the used heat utilization, and can reduce flue-gas temperature, and then reduce desulphurization system water consumption greatly, and reducing the blower fan power consumption, energy conservation and consumption reduction effects is obvious.Because this device is installed on boiler back end ductwork, flue-gas temperature is lower, and cold end corrosion and dust stratification become the major obstacle of its popularization, for solving the cold end corrosion problem, should strictly control the low-pressure coal saver cold junction temperature, makes it be higher than flue gas acid dew point.Particularly in the waste-heat recovery device of deeply reducing exhausted smoke temperature, temperature control should be strict more.Wherein said cold junction refers to the smoke outlet of low-pressure coal saver.Existing waste-heat recovery device all fails to address this problem, and has had a strong impact on the safe and reliable operation of low-pressure coal saver.
Summary of the invention
Therefore, the purpose of this utility model is to provide a kind of low-pressure coal saver that has automatic temperature control system, with the wall temperature of realization low-pressure coal saver and the automatic control of exhaust gas temperature, under the prerequisite that guarantees the security of system reliability service, the degree of depth reduces the exhaust gas temperature of boiler.
The technical solution adopted in the utility model is:
The utility model is the low-pressure coal saver that has automatic temperature control system, the energy saving circulating system that comprises low-pressure coal saver body and configuration, described energy saving circulating system comprises the steam turbine heat regenerative system with main condensate pipeline, and the low temperature feed pipe of drawing from described main condensate pipeline, high temperature water-supply pipe and main water return tube road, wherein low temperature feed pipe and high temperature water-supply pipe all are provided with first solenoid valve and in parallel form the inlet header case that inserts described low-pressure coal saver body behind the main feed water pipe road, and the main water return tube road is connected to the outlet collection case of described low-pressure coal saver body; Wherein said main feed water pipe road is provided with first temperature-detecting device that is connected to control device, and exporting first control signal, and the control device control port is connected with above-mentioned first solenoid valve.
The low-pressure coal saver that has automatic temperature control system according to technical solutions of the utility model, temperature controlled backfeed loop is provided, thereby can control low-pressure coal saver cold side metal wall surface temperature or exhaust gas temperature effectively, prevent that this temperature is low excessively, do not take place under the prerequisite of cold end corrosion at the equipment (comprising flue, desulphurization system, blower fan and chimney etc.) that guarantees low-pressure coal saver heat-exchanging tube bundle and back, improve system thermal efficiency, reach energy saving purposes.
Can design separately as for said control device, also can be integrated in the control section of this low-pressure coal saver on the existing control system, select big flexibly.
Draw the two-way feedwater from the main condensate pipeline of steam turbine heat regenerative system and (refer to the feedwater of said high temperature water-supply and low temperature respectively, certainly its differentiation is the differentiations of both temperature height) enter boiler back end ductwork low-pressure coal saver body after converging, main condensate absorbs therein and enters the steam turbine heat regenerative system from said main water return tube road again after the flue gas heat temperature raises, when main feed temperature is lower than setting value, at first control low-pressure coal saver metallic walls surface temperature, make it be higher than flue gas and calculate dew-point temperature by the adjusting of first solenoid valve.
For the ease of the understanding of those skilled in the art to this programme, to make a pad below again and state, the effect of low-pressure coal saver body is to realize the flue gas waste heat recovery utilization, reaches degree of depth purpose of energy saving.Autonomous condensing water conduit is drawn in the feedwater of low-pressure coal saver, and main condensate is heated by boiler exhaust gas therein, realizes the fume afterheat utilization.During boiler unit load variations, can make the feedwater of low-pressure coal saver and the temperature departure design load of flue gas, influence the heat exchange effect even the security of low-pressure coal saver is worked the mischief, when unit load reduces, the feed temperature of low-pressure coal saver reduces, thereby cause wall surface temperature to cross low and be lower than flue gas acid dew point, cold end corrosion takes place; Too high when feed temperature, also can cause evaporation of water vaporization in the low-pressure coal saver, thereby cause the vibration of low-pressure coal saver, so the too high or too low security reliability that all can seriously should influence low-pressure coal saver of feed temperature; When the low-pressure coal saver exit gas temperature is higher than design load, do not utilize the carrying out of desulphurization reaction, the too high meeting of flue-gas temperature that enters desulfurizing tower simultaneously causes that desulphurization system water consumption obviously increases, when the low-pressure coal saver exit gas temperature is crossed when low, then can cause back-end ductwork and each equipment to corrode, therefore, answer the wall surface temperature and the exit gas temperature of strict control low-pressure coal saver, guarantee the high efficient and reliable operation of system.
Above-mentioned low-pressure coal saver also comprise having second solenoid valve and being connected in the bypass in described main feed water pipe road of picking out from the main water return tube road, and this magnetic valve also is connected in described control device.
Above-mentioned low-pressure coal saver, described control device are the DCS of the system at low-pressure coal saver place.
Above-mentioned low-pressure coal saver is provided with second temperature-detecting device on described low-pressure coal saver, to export second control signal.
Above-mentioned low-pressure coal saver, described first temperature-detecting device and second temperature-detecting device are thermal resistance.
Above-mentioned low-pressure coal saver, described second temperature-detecting device is arranged at the terminal flue of economizer body flue.
Above-mentioned low-pressure coal saver, described first solenoid valve is for often opening solenoid valve, second solenoid valve is normally closed solenoid valve, and according to described first control signal, adjust described first solenoid valve in advance, and after this first solenoid valve reaches capacity the adjustment state, adjust second solenoid valve.
Above-mentioned low-pressure coal saver, described main feed water pipe road is provided with feed pump.
Above-mentioned low-pressure coal saver, described feed pump are frequency conversion type pipe pressurizing pump, regulate its rotating speed according to described second control signal.
Description of drawings
Below in conjunction with Figure of description in detail the technical solution of the utility model is described in detail, wherein:
Fig. 1 is a kind of structural representation that has the low-pressure coal saver of automatic temperature control system according to technical solutions of the utility model.
Among the figure: 1, low temperature feed-regulating valve, 2, the high temperature water-supply control valve, 3, thermal resistance, 4, the pipe pressurizing pump, 5, thermal resistance, 6, the low-pressure coal saver body, 7, the recirculation circuit control valve, 8, the steam turbine heat regenerative system.
The specific embodiment
With reference to explanation accompanying drawing 1, it shows a kind of low-pressure coal saver that has automatic temperature control system, the energy saving circulating system that comprises economizer body 6 and configuration, described energy saving circulating system comprises the steam turbine heat regenerative system 8 with main condensate pipeline, and from the described master low temperature feed pipe that feedwater piping draws that condenses, high temperature water-supply pipe and main water return tube road, wherein low temperature feed pipe and high temperature water-supply pipe all are provided with first solenoid valve and in parallel form the inlet header case that inserts described low-pressure coal saver body behind the main feed water pipe road, and the main water return tube road inserts the outlet collection case of described low-pressure coal saver body; Wherein said main feed water pipe road is provided with first temperature-detecting device that is connected to control device, and exporting first control signal, and the control device control port is connected with above-mentioned first solenoid valve.First solenoid valve comprises and shown in Figure 1 be installed on the low temperature feed-regulating valve 1 on the low temperature feed pipe and be installed on high temperature water-supply control valve on the high temperature water-supply pipe, two pipeline circulations of corresponding this have the different water of temperature height, adjusting by first solenoid valve, control the flow of circulation working medium in two pipelines, and then control the temperature of feedwater piping working medium, be used for satisfying reliable closed-loop control according to described first control signal control.
Preferably, in order better to control the temperature of low-pressure coal saver body, this low-pressure coal saver also comprises having second solenoid valve and being connected in the bypass in described main feed water pipe road of picking out from the main water return tube road, and this magnetic valve also is connected in described control device, with reference to recirculation backwater control valve shown in Figure 1, be said second solenoid valve, the place pipeline is said bypass, perhaps further is called the recirculation backwater and regulates.At first, the main feed water pipe road is through the heating of low-pressure coal saver body 6, the laggard water return pipeline of becoming owner of of temperature rising, still can't adjust cold junction temperature when the adjustment arrival limiting condition of said first solenoid valve and be higher than acid dew-point temperature, be that cold junction temperature be higher than acid dew-point temperature with regard to the adjusting of adopting second magnetic valve this moment.
It is nothing but that the high temperature water-supply control valve reaches maximum opening that the limit of first solenoid valve is regulated, and the low temperature feed-regulating valve then is in closed condition.
Further, described control device is the DCS of the system at low-pressure coal saver place, such as Power Plant DCS, is convenient to integrated control.
In order further to improve the objectivity and the accuracy of control, on described low-pressure coal saver, be provided with second temperature-detecting device, to export second control signal.The rotating speed of controlling the pipeline booster pump by second control signal is to realize the adjusting of exit gas temperature.When exit gas temperature departs from setting value, change exit gas temperature by the rotating speed that changes the frequency conversion type booster pump.
Preferably: described first temperature-detecting device and second temperature-detecting device are thermal resistance, and be simple in structure, is convenient to lay.
Described second temperature-detecting device is arranged at the terminal flue of economizer body flue, can obtain more objective temperature parameter, more conforms with control logic from the control purpose.
Control logic can embody according to following manner: described first solenoid valve is for often opening solenoid valve, second solenoid valve is normally closed solenoid valve, and according to described first control signal, adjust described first solenoid valve in advance, and after this first solenoid valve reaches capacity the adjustment state, adjust second solenoid valve.So, in the time can adjusting by first solenoid valve, regulate with regard to not needing second solenoid valve, can further satisfy the needs of degree of depth UTILIZATION OF VESIDUAL HEAT IN, only only when adjusting first solenoid valve and can't adjust normal serviceability temperature, just start the adjustment of second solenoid valve, meet the needs of the normal safe operation of assurance system of the utility model elder generation, carry out the central idea of the matters that waste heat utilizes again again.
Further, described main feed water pipe road is provided with feed pump, to strengthen the dynamics of adjusting.
So preferably, described feed pump is a pipe pressurizing pump 4, is frequency conversion pipeline booster pump, is convenient to adjust.
The implementation of following whole narration this programme:
When the boiler unit load changes, main condensate pipeline water temperature changes, the boiler tail flue gas temperature changes, control low-pressure coal saver water side temperature in the design parameter scope by the aperture of regulating high and low temperature feed-regulating valve and recirculation circuit control valve, regulate the exhanst gas outlet temperature by the rotating speed that changes frequency conversion pipeline booster pump and reach design load, guarantee that the low-pressure coal saver wall surface temperature is higher than the flue gas acid dew point temperature, realize the efficient operation of desulphurization system, and guarantee the safety of each equipment of back-end ductwork.
Wall temperature is controlled embodiment automatically: when low-pressure coal saver normally moves, the high temperature water-supply control valve, the low temperature feed-regulating valve all is in normally open, the recirculation return line automatic regulating valve is in normally off, when unit load reduces, steam turbine side main condensate temperature reduces, the low-pressure coal saver feed temperature reduces, carrying out along with heat exchanging process, heat exchanger metallic walls surface temperature reduces gradually, thermal resistance is measured the inlet water temperature variation in real time and is delivered to the DCS robot control system(RCS), when temperature is lower than design load, system sends instruction and drives big high temperature water-supply control valve, turn down the low temperature feed-regulating valve, inlet water temperature is raise, thereby guarantee the metal wall surface temperature in normal range (NR), avoid it to be lower than flue gas acid dew point and cause cold end corrosion.When unit load is very low, high temperature water-supply control valve standard-sized sheet, low temperature feed-regulating valve full cut-off, when inlet water temperature still is lower than design load, system sends instruction unpack and regulates recirculation backwater electric control valve, utilize low-pressure coal saver outlet high-temperature water be back to the porch with low adding to feed water mix, improve inlet water temperature to design load, when guaranteeing unit than underload, wall surface temperature is higher than flue gas acid dew point.
When unit load increases and metallic walls surface temperature when being higher than design load, system sends instruction, opening big low temperature gives control valve, turns down the high temperature water-supply control valve, avoid because of inlet water temperature too high, cause working-medium water carburation by evaporation in the heat exchanger, cause heat exchanger tube vibration, booster, the security of harm low-pressure coal saver.
Flue-gas temperature is controlled embodiment automatically: when unit load increases, exhaust gas temperature raises, the low-pressure coal saver exit gas temperature raises, thermal resistance is measured exit gas temperature in real time and is delivered to terminal DCS robot control system(RCS), when exit gas temperature is higher than design load, system sends instruction, regulate frequency conversion booster pump rotating speed, increase feedwater flow, make exit gas temperature be reduced to design load, realize the high efficiente callback utilization of fume afterheat, improve the boiler generatine set heat efficiency, reduce desulphurization system water consumption, keep desulphurization system and efficiently move.
Reduce and low-pressure coal saver exit gas temperature when being lower than design load when unit is negative, system sends instruction, turns frequency conversion booster pump rotating speed down, and feedwater flow reduces, and makes flue-gas temperature be increased to design load.Prevent each the equipment generation cold end corrosion of low-pressure coal saver and back-end ductwork.
Change the control of inlet water temperature realization heat exchange element wall temperature by regulating each motorized adjustment valve opening, utilize and change the temperature control of pipe pressurizing revolution speed realization outlet cigarette, can guarantee to make full use of fume afterheat under the situation of safe operation, receive good energy-conservation consumption reduction effect.
Claims (9)
1. low-pressure coal saver that has automatic temperature control system, the energy saving circulating system that comprises low-pressure coal saver body (6) and configuration, it is characterized in that: described energy saving circulating system comprises the steam turbine heat regenerative system (8) with main condensate pipeline, and the low temperature feed pipe of drawing from described main condensate pipeline, high temperature water-supply pipe and main water return tube road, wherein low temperature feed pipe and high temperature water-supply pipe all are provided with first solenoid valve and in parallel form the inlet header case that inserts described low-pressure coal saver body behind the main feed water pipe road, and the main water return tube road is connected to the outlet collection case of described low-pressure coal saver body; Wherein said main feed water pipe road is provided with first temperature-detecting device that is connected to control device, and exporting first control signal, and the control device control port is connected with above-mentioned first solenoid valve.
2. low-pressure coal saver according to claim 1 is characterized in that: also comprise having second solenoid valve and being connected in the bypass in described main feed water pipe road of picking out from the main water return tube road, and this magnetic valve also is connected in described control device.
3. low-pressure coal saver according to claim 1 and 2 is characterized in that: described control device is the DCS of the system at low-pressure coal saver place.
4. low-pressure coal saver according to claim 3 is characterized in that: be provided with second temperature-detecting device on described low-pressure coal saver, to export second control signal.
5. low-pressure coal saver according to claim 4 is characterized in that: described first temperature-detecting device and second temperature-detecting device are thermal resistance.
6. low-pressure coal saver according to claim 5 is characterized in that: described second temperature-detecting device is arranged at the terminal flue of economizer body flue.
7. low-pressure coal saver according to claim 6, it is characterized in that: described first solenoid valve is for often opening solenoid valve, second solenoid valve is normally closed solenoid valve, and according to described first control signal, adjust described first solenoid valve in advance, and after this first solenoid valve reaches capacity the adjustment state, adjust second solenoid valve.
8. low-pressure coal saver according to claim 7 is characterized in that: described main feed water pipe road is provided with feed pump.
9. low-pressure coal saver according to claim 8 is characterized in that: described feed pump is a frequency conversion type pipe pressurizing pump (4), regulates its rotating speed according to described second control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205158945U CN201764488U (en) | 2010-09-03 | 2010-09-03 | Low pressure coal saving device with automatic temperature control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205158945U CN201764488U (en) | 2010-09-03 | 2010-09-03 | Low pressure coal saving device with automatic temperature control system |
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| CN201764488U true CN201764488U (en) | 2011-03-16 |
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| CN2010205158945U Expired - Fee Related CN201764488U (en) | 2010-09-03 | 2010-09-03 | Low pressure coal saving device with automatic temperature control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357252A (en) * | 2018-10-12 | 2019-02-19 | 中国大唐集团科学技术研究院有限公司华中分公司 | The control method of thermal power plant's low-level (stack-gas) economizer inflow temperature |
| CN111853756A (en) * | 2020-08-14 | 2020-10-30 | 西安热工研究院有限公司 | Thermal power plant heat supply network drainage waste heat recovery device and method based on low-temperature economizer technology |
| CN114110638A (en) * | 2021-11-26 | 2022-03-01 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass |
| CN116658925A (en) * | 2023-07-07 | 2023-08-29 | 广州长晟环保有限公司 | Deep denitration process for biomass boiler flue gas |
-
2010
- 2010-09-03 CN CN2010205158945U patent/CN201764488U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357252A (en) * | 2018-10-12 | 2019-02-19 | 中国大唐集团科学技术研究院有限公司华中分公司 | The control method of thermal power plant's low-level (stack-gas) economizer inflow temperature |
| CN109357252B (en) * | 2018-10-12 | 2019-08-23 | 中国大唐集团科学技术研究院有限公司华中分公司 | The control method of thermal power plant's low-level (stack-gas) economizer inflow temperature |
| CN111853756A (en) * | 2020-08-14 | 2020-10-30 | 西安热工研究院有限公司 | Thermal power plant heat supply network drainage waste heat recovery device and method based on low-temperature economizer technology |
| CN114110638A (en) * | 2021-11-26 | 2022-03-01 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of air preheater bypass |
| CN114110638B (en) * | 2021-11-26 | 2024-01-19 | 西安热工研究院有限公司 | Automatic regulating system and method for efficient flue gas waste heat utilization of bypass of air preheater |
| CN116658925A (en) * | 2023-07-07 | 2023-08-29 | 广州长晟环保有限公司 | Deep denitration process for biomass boiler flue gas |
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Granted publication date: 20110316 Termination date: 20130903 |