CN213669820U - Coal pulverizer outlet temperature control system based on CO monitoring - Google Patents
Coal pulverizer outlet temperature control system based on CO monitoring Download PDFInfo
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- CN213669820U CN213669820U CN202022288300.8U CN202022288300U CN213669820U CN 213669820 U CN213669820 U CN 213669820U CN 202022288300 U CN202022288300 U CN 202022288300U CN 213669820 U CN213669820 U CN 213669820U
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Abstract
The utility model discloses a coal pulverizer export temperature control system based on CO monitoring, including signal processor and controller. The signal processor receives a CO concentration signal measured by the CO measuring device, a coal mill outlet temperature set value is obtained according to CO concentration and coal quality operation, the controller controls a coal mill hot air adjusting door and a coal mill cold air adjusting door opening, the proportion of hot primary air volume and cold primary air volume is changed, the coal mill outlet temperature is adjusted, the coal mill outlet temperature measured by the coal mill outlet temperature measuring device serves as a feedback signal, closed-loop control of the coal mill outlet temperature is achieved, and the purpose of optimizing and adjusting the coal mill outlet temperature is achieved. This system realizes the accurate control to coal pulverizer outlet temperature through introducing CO concentration signal, under the prerequisite of guaranteeing powder process system safety, improves coal pulverizer outlet temperature, reduces powder process system cold wind volume of mixing, reduces the exhaust gas temperature, improves boiler efficiency, is favorable to safe, the economic operation of unit.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to the technical field of coal fired power plant powder process system is energy-conserving, a coal pulverizer export temperature control system based on CO monitoring is related to.
[ background of the invention ]
The outlet temperature of the coal mill is a main parameter reflecting the drying output of the coal mill, and the outlet temperature of the coal mill is an important safety index for preventing spontaneous combustion of coal powder and explosion of gas-powder mixtures and is also an important index for the economical efficiency of a powder preparation system. The outlet temperature of the coal mill is improved, the hot air quantity in primary air is increased, the smoke-air heat exchange quantity of the air preheater is increased, the heat loss of exhaust smoke is reduced, the initial temperature of pulverized coal airflow is improved, the ignition heat required by pulverized coal ignition is reduced, ignition is easier, the flame center height is reduced, the retention time of the pulverized coal in a hearth is prolonged, the carbon content of fly ash of a boiler is reduced, and the economical efficiency of the boiler is improved. However, too high temperature of the coal dust airflow easily causes spontaneous combustion of the coal dust, so that the coal mill is forced to stop running. Therefore, the selection of the proper coal mill outlet air temperature is of great importance, and the improvement of the coal mill outlet temperature on the basis of safety has important energy-saving significance.
At present, the coal-fired power plant controls the outlet temperature of the coal mill according to the requirements of DL/T5145-2012 'design and calculation technical regulation of coal pulverizing systems of thermal power plants', the outlet temperature of the coal mill is controlled according to ash-free base volatile components in coal-fired drying, most power plants are conservative in controlling the outlet temperature of the coal mill, so that the mixing amount of cold air of the coal pulverizing systems is increased, the cold air amount of air pre-heaters is reduced, the exhaust gas temperature is increased, and the boiler efficiency is reduced.
During the temperature rise process of the pulverized coal, firstly, water is separated out, and then, volatile matters are separated out. The volatile components of coal mainly contain CO2、CO、H2、CH4And the content of CO in the volatile combustible gas is maximum. The onset of precipitation temperatures of the various components are slightly different, with CO2First evolution, CO later evolution, H2、CH4The equal precipitation temperature is higher. When CO is separated out from the powder preparation system, the reaction activity of the characteristic coal dust particles is increased, and the explosion tendency is enhanced, so that the explosion risk of the powder preparation system can be judged in advance by monitoring the abnormal change of the CO separation concentration.
In order to ensure the safe operation of a coal pulverizing system, further improve the outlet temperature of a coal pulverizer, reduce the amount of cold air doped into the coal pulverizing system, improve the boiler efficiency and reduce the coal consumption of a unit, a safe and economical coal pulverizer outlet temperature control system and method are urgently needed at present.
[ Utility model ] content
An object of the utility model is to solve the problem among the above-mentioned prior art, provide a coal pulverizer export temperature control system based on CO monitoring, realize the accurate control to coal pulverizer export temperature through introducing CO concentration signal, under the prerequisite of guaranteeing powder process system safety, improve coal pulverizer export temperature, reduce powder process system cold wind volume of mixing, reduce the temperature of discharging fume, improve boiler efficiency, be favorable to safety, the economic operation of unit.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a coal mill outlet temperature control system based on CO monitoring, comprising:
the outlet of the coal mill is connected with a primary air powder pipeline, and the inlet of the coal mill is connected with a primary air pipe;
the tail end of the primary air powder pipeline is connected with a combustor, and a measuring unit is arranged on the primary air powder pipeline and used for detecting the concentration of CO in the primary air powder pipeline and the temperature of an outlet of the coal mill;
and the control unit is used for receiving the CO concentration data and the coal mill outlet temperature data, sending a control signal to control the opening of a hot air adjusting door of the coal mill and the opening of a cold air adjusting door of the coal mill, and further adjusting the temperature of an outlet of the coal mill.
The utility model discloses further improvement lies in:
the primary air pipe comprises a hot primary air pipe and a cold primary air pipe, a hot air adjusting door is arranged on the hot primary air pipe, and a cold air adjusting door is arranged on the cold primary air pipe; and the control ends of the hot air adjusting door and the cold air adjusting door are connected with the control unit.
The measuring unit comprises a CO measuring device and a temperature measuring device, the CO measuring device and the temperature measuring device are both arranged on the primary air powder pipeline, and the temperature measuring device is arranged close to the combustor.
And an anti-blocking device is arranged on a connecting pipeline between the CO measuring device and the primary air powder pipeline.
The control unit comprises a signal processor and a controller, the CO measuring device is connected with the signal processor, the signal processor is connected with the controller, and the temperature measuring device is connected with the controller; the controller sends out control instructions according to the CO concentration data and the temperature data to adjust the opening degree of the hot air adjusting door of the coal mill and the opening degree of the cold air adjusting door of the coal mill.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a deflagration risk that powder process system was judged to monitoring CO concentration can be directly perceived, reliably judge powder process system operation security, provides the guidance for the operation personnel. The utility model discloses calculate according to CO concentration, coal quality and reacing coal pulverizer outlet temperature setting value, safer, accurate than the simple coal pulverizer outlet temperature of control according to the dry ashless base volatile of coal-fired, under the prerequisite of guaranteeing powder process system safety, improve coal pulverizer outlet temperature, reduce powder process system cold wind volume of mixing, reduce smoke exhaust temperature, improve unit operation security, economic nature. The utility model discloses have the automatic control function, according to the coal pulverizer export temperature setting value control coal pulverizer cold air door and the hot blast door opening of coal pulverizer that the calculation reachs to with coal pulverizer export temperature signal as the feedback, realize the closed-loop control of system.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is the utility model discloses coal fired power plant adopts based on coal pulverizer export temperature control system of CO monitoring.
In the figure: the system comprises a coal mill 1, a hot primary air pipe 2, a cold primary air pipe 3, a coal mill hot air adjusting door 4, a coal mill cold air adjusting door 5, a primary air powder pipeline 6, a CO measuring device 7, a coal mill outlet temperature measuring device 8, a signal processor 9, a controller 10 and a burner 11.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model discloses coal pulverizer export temperature control system based on CO monitoring, including coal pulverizer 1, wind pipe 2 is once spent to heat, cold tuber pipe 3 once, the hot-blast regulating gate 4 of coal pulverizer, coal pulverizer cold wind regulating gate 5, wind powder pipeline 6 once, CO measuring device 7, coal pulverizer export temperature measuring device 8, signal processor 9, controller 10, combustor 11.
The signal processor 9 receives a CO concentration signal S1 measured by the CO measuring device 7, a coal mill outlet temperature set value D1 is obtained according to CO concentration and coal quality operation, the controller 10 controls the opening degrees of a coal mill hot air adjusting door 4 and a coal mill cold air adjusting door 5, the proportion of hot primary air volume and cold primary air volume is changed, the coal mill outlet temperature is adjusted, the coal mill outlet temperature S2 measured by the coal mill outlet temperature measuring device 8 is used as a feedback signal, and closed-loop control of the coal mill outlet temperature is achieved.
The CO measuring device 7 is used for measuring the CO concentration in the primary air-powder duct 6 and inputting a signal S1 to the signal processor 9. The CO measuring device 7 is arranged on the straight pipe section of the primary air powder pipeline 6 at the outlet of the coal mill 1 or at the inlet of the combustor 11. An anti-blocking device is arranged in front of the CO measuring device 7, and the CO measuring device 7 is prevented from being blocked through primary air powder filtration and back blowing.
The signal processor 9 is used for receiving the CO concentration signal S1 and calculating to obtain a coal mill outlet temperature set value D1 according to the CO concentration and the coal quality.
The controller 10 controls the opening of the coal mill hot air adjusting door and the coal mill cold air adjusting door according to the coal mill outlet temperature set value D1 and the actually measured coal mill outlet temperature S2, changes the ratio of the hot primary air volume and the cold primary air volume, and adjusts the coal mill outlet temperature.
The CO concentration control value is 80 ppm-120 ppm, when the CO concentration is less than 80ppm, the set value D1 of the outlet temperature of the coal mill is automatically increased, and when the CO concentration is more than 120ppm, the set value D1 of the outlet temperature of the coal mill is automatically reduced.
In this embodiment, judge the detonation risk of coal pulverizing system through detecting CO concentration, calculate according to CO concentration, coal quality and obtain coal pulverizer outlet temperature setting value, realize the accurate control to coal pulverizer outlet temperature, under the prerequisite of guaranteeing coal pulverizing system safety, improve coal pulverizer outlet temperature, reduce coal pulverizing system cold wind volume of mixing, reduce the temperature of discharging fume, improve unit operation security, economic nature.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A coal pulverizer outlet temperature control system based on CO monitoring, comprising:
the coal mill (1), the outlet of the coal mill (1) is connected with a primary air powder pipeline (6), and the inlet is connected with a primary air pipe;
the tail end of the primary air powder pipeline (6) is connected with a combustor (11), and a measuring unit is arranged on the primary air powder pipeline (6) and used for detecting the concentration of CO in the primary air powder pipeline (6) and the temperature of an outlet of the coal mill (1);
and the control unit is used for receiving the CO concentration data and the outlet temperature data of the coal mill (1), sending a control signal to control a hot air adjusting door of the coal mill and the opening of a cold air adjusting door of the coal mill, and further adjusting the outlet temperature of the coal mill (1).
2. The CO monitoring-based coal mill outlet temperature control system according to claim 1, wherein the primary air duct comprises a hot primary air duct (2) and a cold primary air duct (3), a hot air adjusting door (4) is arranged on the hot primary air duct (2), and a cold air adjusting door (5) is arranged on the cold primary air duct (3); and the control ends of the hot air adjusting door (4) and the cold air adjusting door (5) are connected with the control unit.
3. The coal mill outlet temperature control system based on CO monitoring according to claim 1, characterized in that the measuring unit comprises a CO measuring device (7) and a temperature measuring device (8), the CO measuring device (7) and the temperature measuring device (8) are both arranged on the primary air dust duct (6), and the temperature measuring device (8) is arranged close to the burner (11).
4. The system for controlling the outlet temperature of the coal mill based on CO monitoring as claimed in claim 3, wherein an anti-blocking device is arranged on a connecting pipeline between the CO measuring device (7) and the primary air powder pipeline (6).
5. The CO monitoring based coal mill outlet temperature control system according to claim 4, characterized in that the control unit comprises a signal processor (9) and a controller (10), the CO measuring device (7) is connected with the signal processor (9), the signal processor (9) is connected with the controller (10), and the temperature measuring device (8) is connected with the controller (10); the controller (10) sends out control instructions according to the CO concentration data and the temperature data to adjust the opening degree of the hot air adjusting door of the coal mill and the opening degree of the cold air adjusting door of the coal mill.
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| CN202022288300.8U CN213669820U (en) | 2020-10-14 | 2020-10-14 | Coal pulverizer outlet temperature control system based on CO monitoring |
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| CN202022288300.8U CN213669820U (en) | 2020-10-14 | 2020-10-14 | Coal pulverizer outlet temperature control system based on CO monitoring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108261A (en) * | 2020-10-14 | 2020-12-22 | 西安热工研究院有限公司 | Coal mill outlet temperature control system and method based on CO monitoring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108261A (en) * | 2020-10-14 | 2020-12-22 | 西安热工研究院有限公司 | Coal mill outlet temperature control system and method based on CO monitoring |
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