Multi-water-quality response type water supply oxygen and ammonia composite device

Abstract

The present application relates to the technical field of water treatment, and discloses a multi-water-quality-response type water supply oxygenation and ammoniation composite device, which comprises a first pressure monitoring module installed behind a mixer, a second pressure monitoring module installed at an outlet of a main pipe, a first temperature monitoring module and a second temperature monitoring module respectively installed before and behind the mixer, a third temperature monitoring module installed at the outlet of the main pipe, a first hydrogen conductivity analyzer installed before the mixer, a second hydrogen conductivity analyzer installed on a water vapor sampling rack, a correction module and an evaluation module located in the background. The present application establishes an ammoniation and oxygenation correction process based on monitoring indexes, comprehensively adjusts the ammoniation and oxygenation process of a boiler system, effectively improves the accuracy of ammoniation and oxygenation in a more reasonable manner, avoids the problem that the oxidation layer in the furnace is affected due to excessive dosing, significantly improves the water vapor quality qualification rate, and delays the scale deposition rate of the water-cooled wall pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a multi-water quality response type water oxygenation and ammonia addition composite device. BACKGROUND

[0002] Boiler water dosing is an important means to protect the thermal system, and the national standard GB / T12145-2016 specifies the clear range of oxygenation treatment, water pH value, hydrogen conductivity and dissolved oxygen and other indicators, among which the pH indicator is controlled by the ammonia addition process, and the dissolved oxygen is controlled by the oxygenation process, especially for supercritical and ultra-supercritical boilers, because the temperature and pressure are too high, the temporary over-standard of water quality indicators will also affect the service life of the thermal system; therefore, the control of boiler water dosing is crucial. The pH and dissolved oxygen of the boiler water are not only related to the amount of dosing, but also closely related to the temperature, pressure and impurity content of the water itself, and relying only on online indicators to control the amount of dosing has large hysteresis, no predictability, and it is difficult to control the real-time water quality in time, which can easily cause insufficient or excessive dosing problems; it can also cause serious hidden dangers to the safe and stable operation of the unit.

[0003] The current large-scale thermal power units adopt the oxygenation operation mode of the water treatment system in the operation process, and there are problems such as inaccurate oxygenation and ammonia addition amount, and hysteresis in dosing adjustment during the dosing process. Because the temperature and pressure are too high, the temporary over-standard of water quality indicators will also affect the service life of the thermal system, which will directly affect the service life of the boiler four pipes, and may cause corrosion of the inner wall of the boiler pipe, and further cause serious consequences such as boiler pipe explosion and over-temperature, which will cause serious economic losses. SUMMARY

[0004] The purpose of the present application is to provide a multi-water quality response type water oxygenation and ammonia addition composite device to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A multi-water quality response type water oxygenation and ammonia addition composite device, comprising a first pressure monitoring module installed at 30-50 cm behind the mixer and obtaining a pressure monitoring value P1;

[0007] A second pressure monitoring module is installed at the outlet of the mother pipe and obtains a pressure monitoring value P2; A first temperature monitoring module and a second temperature monitoring module are installed at 30-50 cm before and after the mixer respectively, and obtain temperature monitoring values T1 and T2; A third temperature monitoring module is installed at the outlet of the mother pipe and obtains a temperature monitoring value T3;

[0008] The first hydrogen conductivity analyzer is installed in front of the mixer 50-80 cm to obtain the hydrogen conductivity monitoring value D1, and the second hydrogen conductivity analyzer is installed on the water vapor sampling rack to obtain the hydrogen conductivity monitoring value D2.

[0009] The correction module and the evaluation module are located in the background, and the distributed control system (DCS) is used to directly control the ammonia addition amount and the oxygen addition amount in the feed water.

[0010] As a further scheme of the present application, the correction module is used to correct the ammonia addition amount and the oxygen addition amount in the feed water.

[0011] As a further scheme of the present application, the correction method of the ammonia addition amount in the feed water is as follows: according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T2, and the hydrogen conductivity monitoring values D1 and D2, a correction coefficient K1 is formed, and the designed ammonia addition amount F1 is corrected to obtain the corrected ammonia addition amount F2, and the calculation formula is as follows:

[0012] ,

[0013] ;

[0014] In the above formula (1), Take , Take , Take ;

[0015] The corrected ammonia addition control process is directly controlled by the distributed control system.

[0016] As a further scheme of the present application, the correction method of the oxygen addition amount in the feed water is as follows: according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T3, and the hydrogen conductivity monitoring values D1 and D2, a correction coefficient K2 is formed, and the designed oxygen addition amount F3 is corrected to obtain the corrected oxygen addition amount F4, and the calculation formula is as follows:

[0017] ,

[0018] ;

[0019] In the above formula (3), Take , Take , Take ;

[0020] The corrected oxygen addition control process is directly controlled by the distributed control system.

[0021] For example, when the unit superheated steam pressure is in the range of 15.7-18.3 MPa, , When the unit superheated steam pressure is in the range of 18.3-27.9 MPa, ,

[0022] As a further scheme of the present application: the evaluation module is used for evaluating the scale deposition rate of the boiler, the water treatment amount and the main steam water quality qualification rate.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The present application establishes an ammonia and oxygen addition correction process based on monitoring indicators, comprehensively adjusts the ammonia and oxygen addition process of the boiler system, effectively improves the accuracy of ammonia and oxygen addition, establishes a more accurate dosing process, avoids the problem that the oxidation layer fouling in the furnace is affected due to excessive dosing, significantly improves the water vapor quality qualification rate, thereby improving the water treatment amount, and delaying the scale deposition rate of the water-cooled wall tube. With the improvement of water vapor quality, the continuation of the unit life is greatly ensured, and the continuation development of the thermal power unit life evaluation is promoted. DETAILED DESCRIPTION Embodiment 1

[0025] A multi-water quality response type water oxygenation and ammonia addition composite device, comprising a first pressure monitoring module installed 30 cm after the mixer to obtain a pressure monitoring value P1, and a second pressure monitoring module installed at the outlet of the mother pipe to obtain a pressure monitoring value P2;

[0026] A first temperature monitoring module and a second temperature monitoring module are respectively installed 30 cm before and after the mixer to obtain temperature monitoring values T1 and T2; a third temperature monitoring module is installed at the outlet of the mother pipe to obtain a temperature monitoring value T3.

[0027] A first hydrogen conductivity analyzer is installed 50 cm before the mixer to obtain a hydrogen conductivity monitoring value D1, and a second hydrogen conductivity analyzer is installed on the water vapor sampling rack to obtain a hydrogen conductivity monitoring value D2.

[0028] The correction module forms a correction coefficient K1 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T2, and the hydrogen conductivity monitoring values D1 and D2, and corrects the designed ammonia addition amount F1 to obtain a corrected ammonia addition amount F2, and the calculation formula is as follows: , The corrected ammonia addition control process is directly controlled by the distributed control system;

[0029] The correction module corrects the designed oxygen adding amount F3 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T3, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected oxygen adding amount F4, and the calculation formula is as follows: , The corrected oxygen adding control process is directly controlled by the distributed control system.

[0030] The No. 8 unit of Huaneng Laiwu Power Plant is taken as an implementation object, which is a 1000MW unit, the superheated steam pressure is 26.5MPa, the dosing mode is oxygen and ammonia operation, the pressure, temperature and hydrogen conductivity are monitored respectively, the scale deposition rate, the average polishing water production and the main steam water quality qualification rate before and after the dosing correction in a maintenance period are shown in Table 1, and the scale deposition rate, the polishing water production and the main steam water quality qualification rate of the boiler are evaluated by the evaluation module.

[0031] Table 1

[0032] From the above Table 1, it can be concluded that after the system of the application is used in the No. 8 unit of Huaneng Laiwu Power Plant, the scale deposition rates of the water wall to the fire side and the back fire side are significantly reduced, the polishing water production is significantly increased, and the main steam water quality qualification rate is significantly improved.

[0033] Example 2

[0034] A multi-water quality response type water feeding oxygen and ammonia composite device, comprising a first pressure monitoring module installed at 50cm behind the mixer to obtain a pressure monitoring value P1, and a second pressure monitoring module installed at the outlet of the mother pipe to obtain a pressure monitoring value P2.

[0035] A first temperature monitoring module and a second temperature monitoring module are respectively installed at 50cm before and after the mixer to obtain temperature monitoring values T1 and T2, and a third temperature monitoring module is installed at the outlet of the mother pipe to obtain a temperature monitoring value T3.

[0036] A first hydrogen conductivity analyzer is installed at 80cm before the mixer to obtain a hydrogen conductivity monitoring value D1, and a second hydrogen conductivity analyzer is installed on the water vapor sampling rack to obtain a hydrogen conductivity monitoring value D2.

[0037] The correction module corrects the designed ammonia adding amount F1 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T2, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected ammonia adding amount F2, and the calculation formula is as follows: , The corrected ammonia adding control process is directly controlled by the distributed control system.

[0038] The correction module corrects the designed oxygen adding amount F3 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T3, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected oxygen adding amount F4, and the calculation formula is as follows: , The corrected oxygen adding control process is directly controlled by the distributed control system.

[0039] The No. 8 unit of Huadian Zou County Power Plant is taken as an implementation object, which is a 1000MW unit, the superheated steam pressure is 26.7MPa, the dosing mode is oxygen adding and ammonia adding operation, the pressure, temperature and hydrogen conductivity are monitored respectively, the scale deposition rate, the average polishing water production and the main steam water quality qualification rate before and after the dosing correction in a maintenance period are shown in Table 2, and the scale deposition rate, the polishing water production and the main steam water quality qualification rate of the boiler are evaluated by the evaluation module.

[0040] Table 2

[0041] From the above Table 2, it can be concluded that after the system of the application is used in the No. 8 unit of Huadian Zou County Power Plant, the scale deposition rates of the water wall to the fire side and the backfire side are significantly reduced, the polishing water production is significantly increased, and the main steam water quality qualification rate is significantly improved.

[0042] Example 3

[0043] A multi-water quality response type water feeding oxygen adding and ammonia adding composite device comprises a first pressure monitoring module installed at 30cm behind a mixer to obtain a pressure monitoring value P1, and a second pressure monitoring module installed at an outlet of a mother pipe to obtain a pressure monitoring value P2.

[0044] A first temperature monitoring module and a second temperature monitoring module are respectively installed at 30cm before and after the mixer to obtain temperature monitoring values T1 and T2, and a third temperature monitoring module is installed at the outlet of the mother pipe to obtain a temperature monitoring value T3.

[0045] A first hydrogen conductivity analyzer is installed at 50cm before the mixer to obtain a hydrogen conductivity monitoring value D1, and a second hydrogen conductivity analyzer is installed on a water vapor sampling rack to obtain a hydrogen conductivity monitoring value D2.

[0046] A correction module corrects the designed ammonia adding amount F1 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T2, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected ammonia adding amount F2, and the calculation formula is as follows: , The corrected ammonia adding control process is directly controlled by the distributed control system.

[0047] The correction module corrects the designed oxygen adding amount F3 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T3, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected oxygen adding amount F4, and the calculation formula is as follows: , The corrected oxygen adding control process is directly controlled by the distributed control system.

[0048] The No. 5 unit of Huaneng Jiaxiang Power Plant is taken as the implementation object, which is a 300 MW unit, the superheated steam pressure is 17.8 MPa, the dosing mode is oxygen and ammonia operation, the pressure, temperature and hydrogen conductivity are monitored respectively, the scale deposition rate, the average polishing water production and the main steam water quality qualification rate before and after the dosing correction in a maintenance period are shown in Table 3, and the scale deposition rate, the polishing water production and the main steam water quality qualification rate of the boiler are evaluated by the evaluation module.

[0049] Table 3

[0050] From the above Table 3, it can be concluded that after the system of the application is used in the No. 5 unit of Huaneng Jiaxiang Power Plant, the scale deposition rates of the water wall to the fire side and the backfire side are significantly reduced, the polishing water production is significantly increased, and the main steam water quality qualification rate is significantly improved.

[0051] Example 4

[0052] A multi-water quality response type feed water oxygen and ammonia composite device, comprising a first pressure monitoring module installed 50 cm after the mixer to obtain a pressure monitoring value P1, and a second pressure monitoring module installed at the outlet of the mother pipe to obtain a pressure monitoring value P2.

[0053] A first temperature monitoring module and a second temperature monitoring module are respectively installed 50 cm before and after the mixer to obtain temperature monitoring values T1 and T2, and a third temperature monitoring module is installed at the outlet of the mother pipe to obtain a temperature monitoring value T3.

[0054] A first hydrogen conductivity analyzer is installed 80 cm before the mixer to obtain a hydrogen conductivity monitoring value D1, and a second hydrogen conductivity analyzer is installed on the water vapor sampling rack to obtain a hydrogen conductivity monitoring value D2.

[0055] The correction module corrects the designed ammonia adding amount F1 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T2, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected ammonia adding amount F2, and the calculation formula is as follows: , The corrected ammonia adding control process is directly controlled by the distributed control system.

[0056] The correction module corrects the designed oxygen adding amount F3 according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T3, and the hydrogen conductivity monitoring values D1 and D2 to obtain a corrected oxygen adding amount F4, and the calculation formula is as follows: , The corrected oxygen adding control process is directly controlled by the distributed control system.

[0057] The No. 4 unit of Huaneng Xindian Power Plant is taken as an implementation object, which is a 300 MW unit, the superheated steam pressure is 17.9 MPa, the dosing mode is oxygen and ammonia operation, the pressure, temperature and hydrogen conductivity are monitored, the scale deposition rate, the average polishing water production and the main steam water quality qualification rate in a maintenance period before and after the dosing correction are shown in Table 4, and the scale deposition rate, the polishing water production and the main steam water quality qualification rate of the boiler are evaluated by the evaluation module.

[0058] Table 4

[0059] From the above Table 4, it can be concluded that after the No. 4 unit of Huaneng Xindian Power Plant uses the system of the present application, the scale deposition rates of the water wall to the fire side and the backfire side are significantly reduced, the polishing water production is significantly increased, and the main steam water quality qualification rate is significantly improved.

[0060] It can be further concluded that the present application establishes an ammonia and oxygen adding correction process based on monitoring indexes, comprehensively adjusts the ammonia and oxygen adding process of the boiler system, effectively improves the accuracy of ammonia and oxygen adding, establishes a more accurate dosing process, avoids the problem that the oxidation layer fouling in the furnace is affected due to excessive dosing, significantly improves the water vapor quality qualification rate, thereby improving the polishing water production and delaying the scale deposition rate of the water wall tube. With the improvement of the water vapor quality, the continuation of the unit life is greatly guaranteed, and the continuation development of the thermal power unit life evaluation is promoted. The whole thermal power industry realizes high stability operation, avoids asset loss and loss, has guiding application significance and wide application prospect.

[0061] The above is only the preferred specific implementation mode of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A multi-water quality response type water supply oxygen and ammonia adding composite device, characterized by, The first pressure monitoring module is installed 30-50 cm behind the mixer, and a pressure monitoring value P1 is obtained; The second pressure monitoring module is installed at the outlet of the main pipe, and a pressure monitoring value P2 is obtained; the first temperature monitoring module and the second temperature monitoring module are installed 30-50 cm before and after the mixer respectively, and temperature monitoring values T1 and T2 are obtained; the third temperature monitoring module is installed at the outlet of the main pipe, and a temperature monitoring value T3 is obtained; The first hydrogen conductivity analyzer is installed 50-80 cm before the mixer, and a hydrogen conductivity monitoring value D1 is obtained; the second hydrogen conductivity analyzer is installed on the water vapor sampling rack, and a hydrogen conductivity monitoring value D2 is obtained; The correction module and the evaluation module are located in the background, and a distributed control system is used to directly control the ammonia addition amount and the oxygen addition amount in the feed water; The correction module is used to correct the ammonia addition amount and the oxygen addition amount in the feed water; The calculation method of the ammonia addition amount correction in the feed water is as follows: according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T2, and the hydrogen conductivity monitoring values D1 and D2, a correction coefficient K1 is formed, and the designed ammonia addition amount F1 is corrected to obtain a corrected ammonia addition amount F2, and the calculation formula is as follows: ， ； In the above formula (1), Take , Take , Take ; The corrected ammonia addition control process is directly controlled by the distributed control system; The calculation method of the oxygen addition amount correction in the feed water is as follows: according to the pressure monitoring values P1 and P2, the temperature monitoring values T1 and T3, and the hydrogen conductivity monitoring values D1 and D2, a correction coefficient K2 is formed, and the designed oxygen addition amount F3 is corrected to obtain a corrected oxygen addition amount F4, and the calculation formula is as follows: ， ； In the above formula (3), Take , Take , Take ; The corrected oxygen addition control process is directly controlled by the distributed control system.

2. The multi-water quality response water oxygenation and ammonia infusion device of claim 1, wherein, The evaluation module is used to evaluate the scale deposition rate of the boiler, the treated water quantity, and the main steam water quality qualification rate.

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