The method of removing the valve on the steam side of the high-pressure heater to participate in the unit's primary frequency regulation and loading
A high-pressure heater and loading technology, applied in steam engine installations, machines/engines, lighting and heating equipment, etc., can solve the problems of lack of power supply load, increase of unit load, and large loss of valve throttling, so as to achieve economical operation. Effect
Active Publication Date: 2019-04-26
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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Problems solved by technology
However, since the control door is fully open, that is, it loses the ability to continue to open the control door to increase the load of the unit quickly. How to meet the performance requirements of the power grid dispatching for the unit's primary frequency regulation is a big problem.
Especially in the context of the current UHV power grid and large-scale DC transmission, once the power supply load at the receiving end is lost due to transmission line failure, the frequency of the grid drops rapidly, and the local unit needs to quickly increase the load to achieve the primary frequency regulation function. Therefore, these throttling There is a large contradiction between the economical operation mode of the steam distribution unit and the primary frequency regulation capability
[0004] In order to meet the performance requirements of primary frequency regulation, many domestic units of this type have to close the high-voltage valve and adopt the mode of throttle operation, which sacrifices a large economy, especially under low load, the throttling loss of the valve is even greater
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[0029] For a certain 1000MW ultra-supercritical steam turbine unit, usually adopts the economic mode of high-pressure valve full-open sliding pressure operation, and according to its heat balance diagram, the extracted steam energy storage of the high-pressure heater can be calculated, as shown in Table 1 below.
[0030] Table 1 Theoretical calculation amount of 1000MW unit high pressure heater shedding load increase
[0031]
[0032] It can be seen from Table 1 that under the rated load of the unit, cutting off all the high-pressure heaters can theoretically increase the output of the unit by 131.5MW. The 1000MW adopts a double-column arrangement of high-pressure heaters, and only one column of high-pressure heaters can be removed, so that the output can be increased by half under the rated load theoretically, that is, an increase of 75.7MW.
[0033] The specific steps to participate in a frequency modulation load by cutting off the steam side valve of the high pressure he...
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The invention relates to a method for cutting out a high-pressure heater steam side valve for participating in unit primary frequency modulation and load adding. According to the method, a high-pressure control valve full opening economical operation manner is maintained, when the frequency of a power grid is reduced to the set threshold value, accumulated energy of exhaust of a high-pressure heater is released by cutting out the high-pressure heater steam side valve, and the primary frequency modulation and fast load adding function is achieved. Compared with the prior art, according to the method for cutting out the high-pressure heater steam side valve for participating in unit primary frequency modulation and load adding, economical running can be achieved, the requirement for primary frequency modulation can be met as well, great significance is achieved for numerous throttling steam distribution units, and energy conservation and emission reduction of thermal power generation units can be further promoted.
Description
technical field [0001] The invention relates to the field of automatic control of a thermal power generating set, and is mainly applicable to a steam turbine set with all-round throttling and distribution of steam, and in particular relates to a method for removing a steam side valve of a high-pressure heater from participating in the unit's primary frequency regulation and loading. Background technique [0002] Since electric energy is difficult to store on a large scale, the power grid needs to maintain a balance between power consumption and power generation at all times, and the frequency of the power grid is an important indicator to reflect this situation. When the power consumption load is greater than the power generation load, the grid frequency will drop; conversely, when the power generation load is greater than the power consumption load, the grid frequency will increase. Primary frequency regulation means that the unit directly receives the deviation signal of t...
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IPC IPC(8): F22D5/26F01K7/34F01K7/38
CPCF01K7/345F01K7/38F22D5/26
Inventor 沈丛奇祝建飞茅冬春马建华沈建峰程际云汪朝阳
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG