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Based on a typical 600 MW coal-fired cogeneration unit, novel systems with integrated steam jet and external steam cooler are proposed. In novel system I, the waste heat from exhaust steam is recovered through a steam jet, in which reheat steam is chosen as the working fluid. In novel system II, an external steam cooler is used to reduce the superheat of the mixed steam and the heat load of the boiler. Based on EBSILON professional modeling, the system is analyzed considering the peak shaving performance and thermodynamic performance under the maximum heating condition (extracted steam for heating: 800 t/h) and variable conditions. Moreover, the effects of mixed steam pressure and heat exchanger end difference on the system performance are also investigated. The results show that, under the maximum heating condition, compared with those of the reference system, the heating capacities of the novel system I and II increase by 21.59 and 14.47 percentage points, and the power generation efficiencies are increase by 2.48 and 2.78 percentage points, respectively. With the heating load of 300 MW, the power load regulation ratios of the novel system I and II improve by 6.00 and 3.91 percentage points compared with the reference system, and the lower limits of generation reduce by 84.75 MW and 74.32 MW. The gross efficiency of the novel system I and II improve by 3.02 and 2.65 percentage points, respectively, when the mixing steam pressure is increased from 50 kPa to 85 kPa. With the upper temperature difference increasing from 1 ℃ to 9 ℃, the gross efficiencies of the novel system I and II decrease by 1.67 and 1.51 percentage points, respectively. The result can provide technical references for expanding heating capacity and deep peaking of coal-fired cogeneration systems.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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