Study, judgment and disposal method for steam with water of saturated steam generator set

Abstract

The invention relates to the technical field of saturated steam power generation application, in particular to a method for studying, judging and disposing steam with water of a saturated steam generator set, which comprises the following steps of: firstly, judging the occurrence of steam with water, and executing a co-disposal step when judging that the steam with water occurs; the co-processing step specifically comprises the steps of reducing the door opening degree, opening a steam pipeline to drain water, opening a steam-water separator and a steam turbine body drain valve, increasing the circulating water amount and maintaining the pressure of a pressure equalizing box. According to the method, a multi-dimensional steam water-carrying judgment system is established, the steam flow, the steam exhaust chamber temperature, the system vacuum pressure, the load change, the condensed water conductivity and monitoring of multiple parameters in a pressure equalizing pressure box are included, the steam water-carrying phenomenon can be found timely and accurately, and through cooperation of multiple co-processing control means, the steam water-carrying phenomenon can be timely and accurately found out. The impact of water carried by the surplus steam on a steam pipe network is effectively reduced, and the operation safety of the generator set is improved.

Description

Technical Field

[0001] The invention relates to the technical field of saturated steam power generation application, and in particular to a method for analyzing and treating water in steam of a saturated steam generator set. Background Art

[0002] At present, the gas source of saturated steam generator sets mainly comes from the saturated steam in the pipeline network and the saturated steam produced in the converter steelmaking process. Affected by the front-end production rhythm, the saturated steam has high humidity, and the production process is discontinuous and unstable. Steam often contains water, which has an adverse effect on the safe and stable operation of the generator sets.

[0003] Therefore, how to identify and deal with the phenomenon of steam carrying water in advance and avoid the steam generator set tripping is an issue that needs to be solved urgently. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention overcomes the shortcomings of the prior art and provides a method for analyzing and treating steam water carryover in a saturated steam generator set. By establishing a multi-dimensional steam water carryover judgment system, including monitoring of steam flow, exhaust chamber temperature, system vacuum pressure, load changes, condensate conductivity and multiple parameters in the equalizing pressure box, the steam water carryover phenomenon can be detected in a timely and accurate manner, effectively reducing the impact of excess steam water carryover on the steam pipeline network, improving the operating safety of the generator set, and significantly reducing the risk of equipment damage caused by steam water carryover.

[0005] The present invention proposes a method for analyzing and treating water in steam of a saturated steam generator set. First, the occurrence of water in steam is determined. When it is determined that water in steam occurs, a coordinated treatment step is performed. The coordinated treatment step specifically includes: Reduce door opening; Open the steam pipe to drain; Open the steam-water separator and the steam turbine body drain valve; Increase the amount of circulating water; and Maintain the pressure in the equalizing tank.

[0006] The technical solution further defined in the present invention is: Further, the determination of the occurrence of steam with water specifically includes at least one of the following monitoring parameters: Real-time steam flow abnormality (normal steam flow ≈ unit load * 7, abnormality occurs when the steam flow is obviously disproportionate to the load, steam flow range is 25-35t / h); Exhaust chamber temperature rise ≥5℃; System vacuum rise pressure ≥ 0.02KPa; The load drops by more than 0.5MW; The increase in condensed water conductivity is ≥20us / cm; and The pressure in the pressure equalizing tank drops by more than 20KPa.

[0007] Furthermore, the reducing the door opening degree specifically refers to reducing the high-pressure regulating door of the steam turbine by 50%.

[0008] Furthermore, the collaborative disposal step also includes starting a backup water jet pump.

[0009] Furthermore, the maintaining of the pressure in the pressure equalizing tank specifically controls the pressure in the pressure equalizing tank to be within a range of 50-80 KPa.

[0010] The beneficial effects of the present invention are: (1) The present invention establishes a multi-dimensional steam water-carrying judgment system, including monitoring of steam flow, exhaust chamber temperature, system vacuum pressure, load change, condensate conductivity and multiple parameters in the pressure equalization tank, so as to timely and accurately detect the steam water-carrying phenomenon; (2) The present invention effectively reduces the impact of excess steam carrying water on the steam pipeline network through the coordination of multiple coordinated disposal control means, improves the operating safety of the generator set, significantly reduces the risk of equipment damage caused by steam carrying water, greatly reduces the risk of generator set tripping accidents, and ensures the safe and stable operation of the unit. It is very suitable for the operation and management of generator sets in complex working conditions such as steel enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a flow chart of a method for analyzing and treating water in steam of a saturated steam generator set in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0012] The method for judging and handling water in steam of a saturated steam generator set disclosed in the embodiment of the present invention is intended to solve the problem that water in steam is difficult to judge and handle in advance, which may easily lead to unit tripping.

[0013] In a specific embodiment of the present invention, the criteria for determining whether steam carries water are: a. abnormal steam flow rate (load*7≈normal flow rate); b. rise in exhaust chamber temperature (short-term rise in temperature difference ≥5°C); c. rise in system vacuum (short-term rise in 0.02KPa); d. abnormal drop in load (during normal operation, other parameters remain unchanged, and the load suddenly drops by more than 0.5MW); e. rise in condensate conductivity (linear rise ≥20us / cm); f. sudden drop in pressure in the pressure equalizing tank (drop in excess of 20KPa). It can be understood that the normal steam flow standard value described in the present invention is ≈ unit load * 7. It is abnormal when the steam flow is obviously disproportionate to the load. The standard value range of steam flow is 25-35t / h, the standard value temperature of the exhaust chamber is generally 40-44°C, the standard value pressure of the system vacuum is generally -0.095 to -0.090Kpa, the standard value of the system load is generally 4-5MW, the standard value of the condensate conductivity is generally 2-3us / cm, and the standard value of the pressure equalizing tank pressure is generally 50-80Kpa.

[0014] On the other hand, the coordinated treatment method of steam water in saturated steam generator units under the condition of steam carrying water is: a. Reduce the opening of the regulating valve (can be reduced to the minimum safe operating opening) (turbine high regulating valve - about 50%); b. Appropriately open the steam pipe drain (opening is automatic, the maximum can be fully opened); c. Open the steam-water separator and turbine body drain valve opening (opening is automatic, the maximum can be fully opened); d. In case of resumption of steelmaking, the DN350 valve and DN150 valve on the steelmaking side can be opened in advance; e. Increase the circulating water volume; f. Start the standby water injection pump; g. Maintain the pressure of the equalizing tank (50-80KPa); h. The execution time of the front-end resumption operation must last for 100 minutes. If the unit parameters continue to be unstable, the time will be further extended.

[0015] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for analyzing and treating water in steam of a saturated steam generator set, characterized in that: First, the occurrence of steam with water is determined. When it is determined that steam with water occurs, a coordinated treatment step is performed, wherein the coordinated treatment step specifically includes: Reduce door opening; Open the steam pipe to drain; Open the steam-water separator and the steam turbine body drain valve; Increase the amount of circulating water; and Maintain pressure in the equalizing tank.

2. The method for analyzing and treating water in steam of a saturated steam generator set according to claim 1, characterized in that: The determination of the occurrence of steam with water specifically includes at least one of the following monitoring parameters: Real-time steam flow is abnormal; Exhaust chamber temperature rise ≥5℃; System vacuum rise pressure ≥ 0.02KPa; The load drops by more than 0.5MW; The increase in condensed water conductivity is ≥20us / cm; and The pressure in the pressure equalizing tank drops by more than 20KPa.

3. The method for analyzing and treating water in steam of a saturated steam generator set according to claim 1, characterized in that: The reducing door opening degree specifically refers to reducing the high-pressure regulating door of the steam turbine by 50%.

4. The method for analyzing and treating water in steam of a saturated steam generator set according to claim 1, characterized in that: The collaborative disposal step also includes starting a backup water jet pump.

5. The method for analyzing and treating water in steam of a saturated steam generator set according to claim 1, characterized in that: The maintaining of the pressure in the pressure equalizing tank specifically controls the pressure in the pressure equalizing tank to be 50-80 KPa.

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