Comparison of the economic performance of the three kinds of pressure regulating modes of the pipe network
The economic comparison is taken as an example of the gas supply project in the courtyard of the new sunshine zone in Jimo, Qingdao. The above 3 pressure regulating gas supply schemes are designed respectively, and the economy of different gas supply schemes is analyzed.
A total of 6 multi-storey residential buildings, 344 households, 1 gas binocular stoves for each household, and the main equipment and investment cost of the 3 schemes are as follows:
1) using the building regulation mode, the residential area needs 6 standard flow of 25Nm3, / h medium and low pressure suspension type gas regulator, and 344 specifications G1.6 type membrane gas meter is needed inside the household. The diameter range of the courtyard gas pipe network is between DN32 and 150mm, and the other pipe accessories are added, and the comprehensive cost of this district is 16l380 yuan.
2) using the regional pressure regulation mode, the district needs l standard flow of 150Nm / h in medium and low pressure gas regulator cabinet, and 344 pieces of G1.6 type membrane gas meter is needed inside the household. The pipe diameter range of courtyard gas pipeline is between DN32 and 150mm, and the other pipeline accessories are added, and the comprehensive cost of this district is l96840 yuan.
3) using the medium pressure household pressure regulating mode, the district needs 1 standard medium and medium pressure gas surge tanks with standard flow of 150Nm / h, with 344 pieces of G1.6 type film gas meter and 344 sets (indoor and low pressure regulator, household alarm and cutting valve). The range of courtyard gas pipe network pipe is between DN32 and 100mm, and then added to the range of DN32 to 100mm. Other pipes and accessories, the total cost of the district is 2710l0 yuan.
The detailed investment data of different voltage regulation methods are shown in Table 2.
From the comparison between investment cost and operation management cost, the total cost of life cycle is obtained, as shown in Table 3. From table 3, it can be seen that although the technology advantage is obvious, the increase of the cost of voltage regulation equipment can not be balanced by reducing the comprehensive cost of the pipe network. The cost of the household average is much higher than that of the two modes of building regulation and regional pressure regulation. The operation management cost is also the highest in the 3 ways. The way of adjusting the pressure and supplying gas is much more economical than the way of adjusting the air supply by household. Although the regional pressure regulating gas supply mode is lower than the latter operation management cost, but the investment cost is much higher. From the comparison result of the total cost of the life period of Table 3, the building regulation pressure supply mode is a relatively mature, economical and widely used gas supply mode at present.
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