【正文】 Site Selection In site selection for power plants, the following condition shall be studied: grid configuration, power and heat load, fuel supply, water source, traffic, transport of fuel and large equipment, environmental protection requirements, disposal of fly ash and slag, outgoing line corridor, geology, seismology, topography, hydrology, meteorology, land requisition and relocation, construction, and influence of surrounding industrial and mining enterprise on the power plants, so that preliminary schemes can be drawn up and justification and evaluation can be made through overall technical and economic parison and economic efficiency analysis. In the site selection for planning, ments shall be made on the construction scale and pletion time, with proposal on the number and capacity of units to be installed. In the site selection for engineering, ments shall be made on the construction scale and pletion time, with proposal on the number and capacity of units to be installed. In selecting power plant sites, full consideration shall be given to the outgoing conditions for connection with the grid when the power plants reach the planned capacity. Arrangement of Main Building The main buildings should be arranged in the order of boiler house, coal bunker bay, deaerator bay (or bined coal bunker and deaerator bay) and turbine, and their size should not exceed those of the reference design for main buildings for units of the same category. When it is deemed reasonable after technical and economic justification and according to the actual project conditions, other new forms of arrangement that can control project cost and 7 favorable to operation, maintenance and construction can also be adopted. The parable building volume of main building shall not exceed data of reference design of main buildings for units of the same category. In nonseverely cold regions, boilers should be in open or semiopen arrangement. In areas with severe cold or strong sandstorm, tower type boilers should be tightly enclosed with outer wall boards, and nontower type boilers shall either be tightly enclose with outer wall boards or be arranged indoor according to the equipment features and actual condition of the project. In regions with proper climate conditions, boilers with good sealing can be arranged without top partment and rain shield. Boiler Equipment and Systems The type selection of boiler equipment and technical requirements shall be as specified in “Technical Specification for Coal Fired Power Plant Boiler” SD2681988. The type of the boiler equipment must be suited to the quality characteristics of the coal used and the allowable variation of the coal quality in the current specifications. The physical and chemical tests and analyses of the coal and its ash shall be performed to obtain the normal and abnormal characteristic data of the coal quality. The pressure drop from the superheater outlet of the large capacity boiler to the turbine inlet shall be 5% of the rated inlet steam pressure of the turbine. For the unit with subcritical and below parameters, the rated steam temperature at the superheater outlet shall be 3℃ higher than the rated inlet steam temperature of the turbine. At rated conditions, the pressure drops of the cold reheat steam piping, reheater and hot reheat steam piping shall be %~%. 5%, %~% respectively, of the HP turbine exhaust steam pressure at the operation conditions. The rated steam temperature at the reheater outlet shall be 2℃ higher than the rated inlet steam temperature of the IP turbine. The design of the pulverizing system for boiler bustion and equipment shall be in accordance with the design of the boiler proper and its safety protection monitoring system and shall conform with the specifications is “Antiexplosive Directories of Pulverized Coal Boiler Combustion Chamber of Fossil fuel power plant” DL345. 8 外文文獻(xiàn)譯文 2 在電力系統(tǒng)保護中自適應(yīng)繼電保護的進步 摘要 在美國 配電系統(tǒng)被認(rèn)為是存在的最復(fù)雜的機器之一。對燃煤及其灰分應(yīng)進行物理、化學(xué)試驗與分析，取得煤質(zhì)的常規(guī)特性數(shù)據(jù)和非常規(guī) 特性數(shù) 據(jù)。對嚴(yán)寒或風(fēng)沙大的地區(qū)，當(dāng)采用塔式鍋爐時，宜采用緊身罩封閉；對非塔式鍋爐應(yīng)根據(jù)設(shè)備特點及工程具體情況采用緊身罩或屋內(nèi)式布置。 選擇電廠廠址時，應(yīng)充分考慮發(fā)電廠達(dá)到規(guī)劃容量時接入系統(tǒng)的出線條件。在條件合適時，應(yīng)優(yōu)先選用標(biāo)準(zhǔn)系列產(chǎn)品和節(jié)能產(chǎn)品。同容量機、爐宜采用同一型式或改進型式，其配套設(shè)備的型式也宜一致 。本規(guī)程適用于新建或擴建電廠的設(shè)計，改建工程的設(shè)計可參照使用。 本規(guī)程委托中國電力建設(shè)咨詢公司負(fù)責(zé)解釋。 推廣應(yīng)用燃?xì)?蒸汽聯(lián)合循環(huán)發(fā)電技術(shù)，煙氣脫硫技術(shù)和潔凈煤發(fā)電技術(shù)是 21 世紀(jì)電力的發(fā)展方向，但與常規(guī)燃煤發(fā)電技術(shù)相比，國內(nèi)實踐經(jīng)驗較少，尚欠成熟。 DL500