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The pressure cryogenic gas processing plants and freeze the frozen block block


. 3MPa) precipitation of liquid water will not, will not some of the gas composition and gas hydrate formation and cause the device to frozen block, the pressure cryogenic gas processing plant on the feed gas in the CO, content is very strict requirements. Four such as natural gas treatment plant gas plant gas treatment plant design feed gas C (), content (molar fraction) ~ 0.034031% 0.012515%, but in fact the content of C02 feed gas is far far higher than the design value, and extensive use of CO2 in the Zhongyuan oil field gas drive oil recovery technology, resulting in feed gas C (), content increasing, the content is generally around 1.5%, instantaneous high-value up to 3 %. Figure 1 shows that, in the tower off the methane pressure and temperature conditions, the feed gas in the CO, content of more than 1.8% will be frozen block. Four gas plant equipment under the operator's practical experience,[link widoczny dla zalogowanych], the feed gas in the CO: content exceeds 1.8%, if the methane is less than one Overhead operating temperature 97 ~ C (when the content exceeds 2.4%,[link widoczny dla zalogowanych], less than a 95 ��) appears frozen block. Can be seen blocking the actual freezing temperature conditions and the data in Figure 1 curve is very close. Can also be seen by comparison to the current operating conditions of the tower off of methane (1.3MPa, a 99 ��), the content of CO2 in feed gas is very close to freezing conditions, blocking the formation of areas, \conditions of the formation area. Therefore, some CO, contents under pressure deep in the cold gas processing plant is difficult to avoid CO, frozen block. 2 additional freeze frost plug block measures 2.1 additional pre-alarm blocking pre-freeze alarm device alarm to the operator to provide, under the operating rules by the operator to take appropriate measures to prevent the occurrence of frozen block. Were blocked because of frozen methane produced in the tower off the top of the throttle exports, and the two phenomena are not the same when the frozen block, how warning must be considered separately. Blocking off of methane frozen at the top of the tower top pressure changes when the automatic alarm device by monitoring, and when the top of abnormal pressure changes occur to the operator prompted the warning signs of cold block information, which block to prevent the phenomenon of cold continue to develop a continuous deterioration and protect the smooth operation of the device is very important. For the throttle,[link widoczny dla zalogowanych], the frozen block is a gradual process of development, there are signs of frozen block,[link widoczny dla zalogowanych], throttle temperature difference before and after the change, mainly as follows: the valve before the temperature drops, the valve temperature to rise. According to the practical experience of the operator, after the throttle hard to thaw frozen block, early warning message to the operator is crucial. Therefore, timely monitoring by alarm, to prevent serious throttle or completely block freezing cold block. This measure has the advantage of preserving the existing gas treatment process,[link widoczny dla zalogowanych], the device changes - ~ E / J,, is relatively less investment, according to police information the operator can make on a timely adjustment of operating parameters, to avoid blocking or freezing thawing process parameter fluctuations in the damage caused to the equipment. 2.2 A new device with the Zhongyuan oil field injection decarbonization C02 for enhanced oil recovery measures widely used in the C02 content of the feed gas will be more and more, a lot of pressure cryogenic gas processing plant will have removed C02. Decarburization currently widely used chemical absorption process is mainly divided into two types of physical absorption and _3J. Two methods have relatively mature technology, and develop faster. Southern Research Institute of the Group such as domestic newly developed \consumption reduced by 30% or more, can guarantee the achievement of decarbonization, based on the device to minimize the investment, operating costs of gas consumption and operation. 2.3 The establishment of the pipeline pressure thawing cryogenic gas processing plant in the freezing temperature of blocking usually occurs in the lowest, through a pipeline will be thawed raw gas at high temperature (25oC) lead to the blocking position of low-temperature freezing (a IO0 ~ C), Practice shows that the defrosting measures are effective. Thawed using the feed gas as gas, both to avoid the mixing of other components in the system, but also eliminates the need for indirect heating device shut down after the thawing of the tedious steps.
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