Thread Content
1. Introduce external steam to build the pipeline network; put the traps into operation and activate the drain valves. Close the inlet valves of each turbine, open the drains in front of valves MCV-27 and 28, and activate the drains at the lowest points along the MS and LS pipelines. Close the PCV-13 and PCV-131 inlet and outlet valves as well as the bypass valve; close the MCV-1180 valve; open the PCV-25 inlet valve ； Close the FCV-2 inlet and outlet valves as well as the bypass valve ； Close the MCV-19 inlet and outlet valves as well as the bypass valve ； Close the MS isolation valve at E66401, close the MS isolation valve coming from E66401, and close the upstream and downstream valves as well as the bypass valve of FCV-97 ； Open the PCV-15 front valve, close the bypass valve, set PIC-15 to 0.38 Mpa and switch it to automatic mode ； Open the drain valves in each row of the MS pipeline leading from Reactor 4# to Stage 2, open the main valve on MS-60-8″ (the valve coming from Reactor 4#), and close the bypass valve ； Contact to have Unit 4’s high-pressure boiler send MS to start pipe warming, with the warming process lasting no less than 30 minutes ； Turn on the heating pipes for PCV-25, PCV-14, PCV-17, and PCV-15; after confirming that there is no condensation in the drain line, install the steam trap and close the drain valve. It can also remain open throughout winter ； Gradually increase the PIC-25 settings, using PIC-25 in conjunction with boosting. Note: Keep the pressure increase rate at 0.1 Mpa/Min to strictly prevent water hammer. Pressure increase can be carried out only when TI1_40 reaches 320°C. During pressure increase, set PIC-14 to 0.4 MPa and put it in automatic mode; set PIC-17 to 0.35 MPa and put it in automatic mode as well, and set PIC-15 to 0.38 MPa with automatic operation. When PIC-25 reaches 3.82 MPa, set it to 3.82 MPa and activate automatic mode for it. Once the medium-pressure and low-pressure pipelines are operating normally, cooling water is introduced (the cooling water is desalinated water from the 104-J outlet). 2. Drainage of deionized water 2.1 For the 4# high-pressure boiler: close the DW valve connected to this boiler, open the DW bypass valve for it; close the DW inlet valve at 134-C, close the DW inlet valve at 106-C, and close MCV-252 as well as the valves before and after it. 2.2 For the deaerator at 101-U: open the DW inlet valves at 134-C and 106-C in order to establish a liquid level ； Open the inlet and outlet valves of LCV-23, close the drain valve between them; close the bypass valve of LCV-23 and open the inlet and outlet valves of MCV-252, then close MCV-252 ； Close the bypass valve for HCV-04901, close HCV-04901, close the inlet and outlet valves as well as the bypass valve for PCV-229, close PCV-229 ； Start LCV-23; after confirming that the level of 101-U is around 50%, switch LCV-23 to automatic mode. 3. Conditions for raising temperature in the large nitrogen cycle: Sinochem takes samples from N80 for analysis; two consecutive analyses showing 99.9% O2 are considered satisfactory, and once the analysis results are acceptable, N80 can be introduced into the system. 3.1 Pressurization 3.1.1 Close the inlet valve at 110-D on the conversion unit, close the N80 valve at the inlet of 103-C; verify that a proper vacuum has been established in 152-JC, confirm that HS-17 is in the “normal” position; check that on the DCS screen, LAL-103A/B, LA-121, LA-106, PAH-2A, and PAH-2B (jacket liquid levels) are showing appropriate values. Close MCV-26, the rear valve of FCV-2, as well as the front and bypass valves of MCV-19; close SP-3, MCV-101, FCV-2, MCV-19, and HCV-8, and open TCV-10 ； 3.1.2 At the synthesis station, close valve N80 at position 106-D, close MCV-21, PCV-182, and MCV-11; open SP-71. After closing MCV-11, close its downstream valve as well as the bypass valve. Close the process gas inlet valve and bypass valve at 101-E, close the process gas outlet valve at 104-F, close the upstream valves of PCV-182 and MCV-25, and close the downstream drain at 104-F as well as the upstream valve of LCV-8 ； 3.1.3 The guide plates were used to confirm that the two \"8\"-shaped blind plates on the nitrogen circulation line had been reversed in position, and it was verified that the temporary blind plate at outlet 114-C had been installed ； Open the two nitrogen circulation valves on N-602-8″ and N-603-8″; close the large feed line valve 102-J, as well as the bottom drain valve of the eight rows of furnace tubes. Close the outlet vent valves 108-DA/DB, and also the two valves at the outlets of 108-DA/DB and 110-D. Close the outlet valve of 104-DB, as well as the bypass valves SP-4 and SP-5; open SP-5 (this is to initiate nitrogen circulation heating without connecting to the low-pressure transformer). Open the inlet and outlet valves of 108-DA, as well as the second valve at the outlet of 108-DA. Open the two valves within the N80 section supplied from Unit 1. Open the N80 inlet valve of 103-C to pressurize it (or open valves 109-D and 108-DA for hydrogenation). The process has been confirmed; contact Sinochem to retrieve a replacement sample from A12 – the sample meets the requirements (O2)