CN209879328U - Ultra-low emission desulfurization energy-saving operation system based on sulfur overall process monitoring - Google Patents
Ultra-low emission desulfurization energy-saving operation system based on sulfur overall process monitoring Download PDFInfo
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- CN209879328U CN209879328U CN201921016812.XU CN201921016812U CN209879328U CN 209879328 U CN209879328 U CN 209879328U CN 201921016812 U CN201921016812 U CN 201921016812U CN 209879328 U CN209879328 U CN 209879328U
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Abstract
The utility model discloses an energy-conserving operating system of ultralow emission desulfurization based on overall process monitoring of sulphur, adjust and controlling means including coal quality on-line monitoring device, sulfur dioxide feedback device and circulating pump coupling, among the desulfurization system of energy-conserving operating system mainly used coal fired power plant of desulfurization. Firstly, the element content of coal as fired is directly detected by a coal element rapid detection device of a coal quality monitoring device, the amount of sulfur dioxide entering a system is predicted by setting programs and formula calculation in the system, and then the start and stop of a circulating pump are adjusted in advance by judgment and control software of a circulating pump coupling adjustment and control system. And finally, reading the online monitoring value of the desulfurization outlet, and performing feedback check through a sulfur dioxide feedback system to realize the energy-saving operation of the desulfurization system.
Description
Technical Field
The utility model relates to a desulfurization energy-conserving operation under the ultralow emission condition of overall process monitoring based on sulphur belongs to the flue gas and administers technical field.
Background
The desulfurization system is the system with the highest energy consumption in the environment-friendly system behind the coal-fired power plant furnace, and accounts for 1% -1.5% of the plant power. Wherein, the circulating pump is a main power consumption household and accounts for more than half of the whole desulfurization power consumption proportion. In 2015, the three committees require that the coal-fired power plant comprehensively realizes ultralow emission, most of the desulfurization devices adopt large liquid-gas ratio to wash sulfur dioxide, efficiency is improved by adding a circulating pump or an expansion circulating pump in transformation, and energy consumption of the desulfurization devices is remarkably increased in ultralow emission.
In the ultra-low transformation design, the circulating pump is configured at full load and coal quality. In actual operation, the full-load working condition is few, and the coal quality also changes, so that the circulating pump has a large margin in operation, and an energy-saving space exists. The reasonable operation combination of the circulating pump can effectively realize desulfurization and energy saving.
In the ultra-low emission operation of the coal-fired power plant, the energy-saving means of desulfurization is realized by manually turning off the circulating pump. During the operation process, the start and stop of the circulating pump are adjusted according to the sulfur dioxide value measured by the CEMS at the desulfurization inlet and the operation experience, and the sulfur dioxide value measured by the CEMS at the outlet is controlled to be 35mg/Nm3Within. However, because the change of coal quality and the amount of sulfur dioxide entering the system cannot be predicted, a large margin is always reserved, and the energy-saving optimal operation cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the problem that exists among the prior art, provide an ultralow emission desulfurization energy-saving operation system based on overall process monitoring of sulphur, through the sulphur dioxide volume of foreknowing entering system in advance, carry out the selection of circulating pump combination operation mode.
In order to achieve the above object, the utility model provides a technical scheme does: a sulfur-based ultra-low emission desulfurization energy-saving operation system for overall process monitoring is used in a desulfurization system of a coal-fired power plant, and comprises a boiler, a coal feeder arranged in front of the boiler, a desulfurization tower arranged behind the boiler and a plurality of circulating pumps arranged on the desulfurization tower; the desulfurization energy-saving operation system comprises a coal quality detection device and a circulating pump coupling adjustment and control device, wherein the coal quality detection device is arranged on the coal feeder, the circulating pump coupling adjustment and control device comprises a calculation module and a circulating pump control module which are connected with each other, the circulating pump control module is connected with the circulating pump, and the coal quality detection device is connected with the calculation module and used for detecting coal information of coal as fired and transmitting the coal information to the calculation module; the calculation module is used for calculating the operation parameters such as the flue gas volume and the sulfur dioxide volume entering the desulfurization system, and transmitting the operation parameters to the circulating pump control module, the circulating pump control module is internally prestored with various operation parameters and the circulating pump operation combination mode corresponding to the operation parameters, and the circulating pump control module compares the received operation parameters with the prestored operation parameters to obtain the optimal operation combination mode of the circulating pump, and controls the start and stop of the circulating pump.
The technical scheme is further designed as follows: the device for coupling adjustment and control of the circulating pump further comprises a protection module, the protection module is connected with a circulating pump control module and is provided with the safe operation number of the circulating pump, and when the circulating pump opening number in the optimal operation combined mode of the circulating pump is less than the safe operation number, the protection module can control the circulating pump opening number to be the safe operation number through the circulating pump control module.
The calculation module is also used for calculating the outlet sulfur dioxide value of the desulfurization system according to the optimal operation combination mode of the circulating pump, comparing the calculated outlet sulfur dioxide value of the desulfurization system with the set value, transmitting the comparison result to the circulating pump control module, and the circulating pump control module adjusts the operation combination mode of the circulating pump according to the comparison result; and repeating the operation until the deviation is minimum, wherein the operation combination mode of the circulating pump at the moment is the optimal operation combination mode of the circulating pump.
The energy-saving desulfurization operation system further comprises a sulfur dioxide feedback device, wherein the sulfur dioxide feedback device comprises a desulfurization system outlet CEMS, the desulfurization system outlet CEMS is used for monitoring a desulfurization system outlet sulfur dioxide value and transmitting the value to a calculation module, the calculation module compares the monitored desulfurization system outlet sulfur dioxide value with a set value and transmits the comparison result to a circulating pump control module, and the circulating pump control module adjusts the operation combination mode of the circulating pump according to the comparison result; and repeating the operation until the outlet sulfur dioxide value is equal to or less than the set value, wherein the circulating pump operation combination mode at the moment is the optimal circulating pump operation combination mode.
The coal quality detection device comprises a coal quality detector and a moisture meter, wherein the coal quality detector and the moisture meter are respectively used for detecting the sulfur and the moisture of the coal as fired.
The coal quality detection device also comprises a parameter acquisition module, wherein the parameter acquisition module is used for acquiring the coal-fired quantity of the coal as fired in the desulfurization system and the operating parameters of the desulfurization system, and transmitting the coal-fired quantity and the operating parameters to the calculation module.
The parameters of the desulfurization system comprise PH value, slurry density, limestone input amount and the like.
The utility model has the advantages that:
the utility model discloses a sulfur content, moisture and the coal-fired volume of the income stove coal that detects out calculate and get into sulfur dioxide volume in the desulfurization system flue gas to this selects the running mode of circulating pump in advance, and the sulfur dioxide volume that rethread desulfurization system goes into, exports the monitoring feeds back, adjusts the running mode of circulating pump.
The utility model discloses in get into sulfur dioxide volume in the desulfurization system flue gas through the calculation, make the initial selection of circulating pump operational mode can be close the optimal operational mode of circulating pump, the feedback of the sulfur dioxide volume of rethread monitoring can make the operational mode of circulating pump adjust to the optimal operational mode with minimum time to it is energy-conserving that reasonable operation combination that utilizes the circulating pump carries out the desulfurization.
The automatic adjustment of the desulfurization circulating pump is realized by the circulating pump coupling adjusting and controlling device, the operation energy of operators is greatly reduced, and the system fault caused by the misoperation of the operators is prevented.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-low emission desulfurization energy-saving operation system based on overall process monitoring of sulfur in an embodiment of the present invention;
FIG. 2 is a block diagram of the sulfur-based full process monitoring ultra-low emission desulfation economizer operating system of FIG. 1.
In the figure, 1-coal quality detection device; 2-belt coal feeder; 3-a coal mill; 4-a boiler; 5-a desulfurizing tower; 6-circulating pump; 7-Exit CEMS.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1, the ultra-low emission desulfurization energy-saving operation system based on sulfur overall process monitoring of the present invention is used in a desulfurization system of a coal-fired power plant, and the desulfurization system includes a boiler 4, a coal belt feeder 2 and a coal pulverizer 3 which are arranged in front of the boiler, a desulfurization tower 5 which is arranged behind the boiler 4, and a plurality of circulating pumps 6 which are arranged on the desulfurization tower 5; with reference to fig. 2, the desulfurization energy-saving operation system of the present invention includes a coal quality detection device, a circulation pump coupling adjustment and control device, and a sulfur dioxide feedback device, where the coal quality detection device includes a coal quality detector, a moisture meter, and a parameter acquisition module, the circulation pump coupling adjustment and control device includes a calculation module, a circulation pump control module, and a protection module, and the sulfur dioxide feedback device includes a desulfurization system outlet CEMS; the detector, the moisture meter, the parameter acquisition module and the desulfurization system outlet CEMS are respectively connected with the calculation module, and the calculation module and the protection module are respectively connected with the circulating pump control module.
The coal quality detection device 1 is arranged on the belt coal feeder 2, wherein the coal quality detector and the moisture meter can directly measure the element value and the moisture value of the coal as fired respectively, and the parameter acquisition module can be connected with the terminal operation systems of the belt coal feeder and the desulfurization system and is used for acquiring the coal burning quantity of the coal as fired, the operation parameters of the desulfurization system and the like and transmitting all measured values to the calculation module of the circulating pump coupling regulation and control device.
The calculation module receives the sulfur element value, the moisture value and the coal burning quantity and then calculates the sulfur dioxide quantity C entering the real-time system according to the following formulaSO2And averaged in minutes and displayed in the terminal system of the desulfurization system.
CSO2=2×B×S，
CSO2The amount of sulfur dioxide entering the system is kg;
b is the amount of coal consumed, in kg, measured by a belt feeder;
s is the sulfur content in the fuel, and the unit is percent, and is measured by a coal quality detector.
The calculation module obtains the flue gas volume V entering the real-time desulfurization system according to the following formula, averages the flue gas volume V according to minutes, and displays the average value in a terminal operation system of the desulfurization system.
V=0.01(1.867C+0.7S+0.8N+11.2H+1.24H20)+0.79（0.2413Q/1000+0.5）
V is theoretical wet smoke amount and has the unit of kg/m3
C、S、N、H、H20 is respectively carbon, sulfur, nitrogen, hydrogen and water in the coal, and is measured by a coal quality detection device;
q is the lower calorific value of coal, the unit is kJ/kg, and the Q is measured by a coal quality detection device.
And the calculation module compares the calculated amount of the sulfur dioxide and the calculated amount of the flue gas entering the system with the amount of the sulfur dioxide and the calculated amount of the flue gas in the original flue gas actually measured at the inlet CEMS of the desulfurization system, judges the variation trend and feeds the variation trend back to a control module in the circulating pump coupling regulation and control device.
A circulating pump control module in the circulating pump coupling adjustment and control device presets a large number of operation parameters (sulfur dioxide, smoke gas and the like) and corresponding circulating pump combined operation modes. The control module retrieves the optimal operation combination mode of the circulating pump recommended in the database under the operation condition according to the amount of the sulfur dioxide and the flue gas entering the system calculated by the calculation module and other desulfurization operation parameters (such as the parameters of the pH value, the slurry density, the limestone input amount and the like of the system) acquired by the parameter acquisition module, namely selects the circulation pump combination operation mode corresponding to the parameter value closest to the amount of the sulfur dioxide and the flue gas acquired by the calculation module, and controls the start and stop of the circulating pump as the optimal circulation pump combination operation mode.
A calculation module in the circulating pump coupling regulation and control device calculates the sulfur dioxide value at the outlet of the system according to the optimal operation combination mode of the circulating pump selected by the circulating pump control module and compares the sulfur dioxide value with a set value (generally set at 35mg/Nm under the condition of ultralow emission)3And then) transmitting the comparison result to the control module, adjusting the operation mode of the circulating pump by the control module according to the comparison result, and repeating the calculation, comparison and adjustment operations until the sulfur dioxide value at the outlet of the system is less than a set value, and performing the preset adjustment of the circulating pump by taking the operation mode as the operation mode. The adjustment can be automatically realized, and can also prompt an operator to realize manual operation.
And a system operation protection value is set in a protection module in the circulating pump coupling regulation and control device so as to ensure the safe operation of the whole desulfurization system. For example, under normal conditions, the system is set to ensure the safety of the system, and the minimum two circulating pumps are ensured to operate. Under the condition, no matter how low the numerical value of sulfur dioxide entering the system is calculated by the calculation module, the operation of the two circulating pumps is at least ensured, namely when the starting number of the circulating pumps in the optimal operation combined mode of the circulating pumps selected by the control module is less than two, the protection module can control the starting number of the circulating pumps to be two through the circulating pump control module.
The protection module also can protect the running safety of a single circulating pump and prevent the frequent start and stop of a certain single circulating pump. If a circulating pump needs to be started and stopped frequently under a certain condition, the scheme is not displayed as an optimal recommended scheme.
And the sulfur dioxide feedback device carries out post-feedback judgment according to the actually measured sulfur dioxide content at the outlet CEMS of the outlet desulfurization system. The sulfur dioxide outlet is controlled in a reasonable area (less than the set value). If the control value is too low, the configuration margin of the circulating pump is larger, and if the outlet sulfur dioxide value is continuously higher than the set value in a certain period, the operation configuration of the circulating pump is insufficient. The method comprises the following steps that a sulfur dioxide value at an outlet of a desulfurization system is monitored by a CEMS (continuous emission monitoring system) at the outlet of the desulfurization system and is transmitted to a calculation module, the calculation module compares the monitored sulfur dioxide value at the outlet of the desulfurization system with a set value and transmits a comparison result to a circulating pump control module, and the circulating pump control module adjusts a circulating pump operation combination mode according to the comparison result; and repeating the comparison and adjustment operations until the outlet sulfur dioxide value is smaller than a set value, wherein the circulating pump operation combination mode at the moment is the optimal circulating pump operation combination mode.
The utility model discloses utilize above-mentioned back feedback and the calculated value that the front end was prejudged, the circulating pump open and form the relevant trend of coupling between the configuration three and judge.
Examples
The coal as fired is prepared according to the heat value and the sulfur content in a coal yard of a certain power plant, enters a raw coal bunker through a belt coal feeder 2, is recorded into a system after data is detected by a coal quality detection device 1, and the sulfur dioxide amount entering the system is calculated to be 1200mg/Nm through a calculation module in a circulating pump coupling regulation and control device3The smoke amount is 125 multiplied by 104m3H is used as the reference value. The data is directly recorded into the circulating pump coupling adjusting and controlling device.
The parameter acquisition module acquires that the operating pH value of the desulfurization system is 5.4, the slurry density in the desulfurization tower 5 is 1.021 g/ml, and the limestone slurry density is 1.195 g/ml. The circulating pumps 6 are configured into 5 in total, and the outlet sulfur dioxide value control index is 30mg/Nm3. The current circulating pump operation mode is No. 1 No. 2 No. 3 circulating pump operation.
And the parameters are brought into a control module in the circulating pump coupling regulation and control system, and the control module recommends the optimal operation schemes of the No. 1 circulating pump and the No. 4 circulating pump to operate through big data comparison. And calculating the outlet sulfur dioxide concentration to be 29mg/Nm3. At this time, the system prompts: the circulation pump No. 2 and the circulation pump No. 3 are shut down within 1 minute, and the circulation pump No. 4 is started at the same time.
The system operates as described above, with circulation pumps # 1 and # 4 running. The concentration of sulfur dioxide at the outlet is 28-30 mg/Nm detected by CMES 7 at the outlet of the desulfurization system3And if the current running mode is smaller than the set value, the sulfur dioxide feedback device judges that the running mode of the circulating pump is the optimal energy-saving mode at the moment, records that the circulating pump enters a big data system, and becomes one of the alternatives for future running adjustment.
The technical scheme of the utility model is not limited to above-mentioned each embodiment, and the technical scheme that all adopt to equate substitution mode to obtain all falls the utility model discloses the within range that claims.
Claims (7)
1. The utility model provides an energy-conserving operating system of ultralow emission desulfurization based on overall process monitoring of sulphur for among coal fired power plant's the desulfurization system, the desulfurization system includes the boiler, set up the feeder before the boiler, set up desulfurizing tower behind the boiler and set up a plurality of circulating pumps on the desulfurizing tower, its characterized in that: the desulfurization energy-saving operation system comprises a coal quality detection device and a circulating pump coupling adjustment and control device, wherein the coal quality detection device is arranged on the coal feeder, the circulating pump coupling adjustment and control device comprises a calculation module and a circulating pump control module which are connected with each other, the circulating pump control module is connected with the circulating pump, and the coal quality detection device is connected with the calculation module and used for detecting coal information of coal as fired and transmitting the coal information to the calculation module; the calculation module is used for calculating the operation parameters such as the flue gas volume and the sulfur dioxide volume entering the desulfurization system, and transmitting the operation parameters to the circulating pump control module, the circulating pump control module is internally prestored with various operation parameters and the circulating pump operation combination mode corresponding to the operation parameters, and the circulating pump control module compares the received operation parameters with the prestored operation parameters to obtain the optimal operation combination mode of the circulating pump, and controls the start and stop of the circulating pump.
2. The sulfur-based full process monitoring ultra-low emission desulfation energy-saving operating system of claim 1, wherein: the device for coupling adjustment and control of the circulating pump further comprises a protection module, the protection module is connected with a circulating pump control module and is provided with the safe operation number of the circulating pump, and when the circulating pump opening number in the optimal operation combined mode of the circulating pump is less than the safe operation number, the protection module can control the circulating pump opening number to be the safe operation number through the circulating pump control module.
3. The sulfur-based full process monitoring ultra-low emission desulfation energy-saving operating system of claim 1, wherein: the calculation module is also used for calculating the outlet sulfur dioxide value of the desulfurization system according to the optimal operation combination mode of the circulating pump, comparing the calculated outlet sulfur dioxide value of the desulfurization system with the set value, transmitting the comparison result to the circulating pump control module, and the circulating pump control module adjusts the operation combination mode of the circulating pump according to the comparison result; and repeating the operation until the outlet sulfur dioxide value is equal to or less than the set value, wherein the circulating pump operation combination mode at the moment is the optimal circulating pump operation combination mode.
4. The sulfur-based full process monitoring ultra-low emission desulfation energy-saving operating system of claim 3, wherein: the energy-saving desulfurization operation system further comprises a sulfur dioxide feedback device, wherein the sulfur dioxide feedback device comprises a desulfurization system outlet CEMS, the desulfurization system outlet CEMS is used for monitoring a desulfurization system outlet sulfur dioxide value and transmitting the value to a calculation module, the desulfurization system outlet sulfur dioxide value monitored by the calculation module is compared with a set value and a comparison result is transmitted to a circulating pump control module, and the circulating pump control module adjusts a circulating pump operation combination mode according to the comparison result; and repeating the operation until the deviation is minimum, wherein the operation combination mode of the circulating pump at the moment is the optimal operation combination mode of the circulating pump.
5. The sulfur-based full process monitoring ultra-low emission desulfation energy-saving operating system of claim 1, wherein: the coal quality detection device comprises a coal element detector and a moisture meter, wherein the coal element detector and the moisture meter are respectively used for detecting the sulfur and the moisture of the coal as fired.
6. The sulfur-based full process monitoring ultra-low emission desulfation energy-saving operating system of claim 1, wherein: the coal quality detection device also comprises a parameter acquisition module, wherein the parameter acquisition module is used for acquiring the coal-fired quantity of the coal as fired in the desulfurization system and the operating parameters of the desulfurization system, and transmitting the coal-fired quantity and the operating parameters to the calculation module.
7. The sulfur-based full process monitoring ultra-low emission desulfation energy-saving operating system of claim 6, wherein: the parameters of the desulfurization system comprise PH value, slurry density, limestone input amount and the like.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262430A (en) * | 2019-07-02 | 2019-09-20 | 国电环境保护研究院有限公司 | A kind of minimum discharge desulphurization energy-saving operating system of the overall process monitoring based on sulphur |
| CN113062874A (en) * | 2021-02-25 | 2021-07-02 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Automatic control system for slurry amount of wet desulphurization slurry circulating pump |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262430A (en) * | 2019-07-02 | 2019-09-20 | 国电环境保护研究院有限公司 | A kind of minimum discharge desulphurization energy-saving operating system of the overall process monitoring based on sulphur |
| CN113062874A (en) * | 2021-02-25 | 2021-07-02 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Automatic control system for slurry amount of wet desulphurization slurry circulating pump |
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