Efecto de la distancia a las fuentes en la fluencia neutrónica

a. If the charge stock used for startup was not the normal charge stock, the normal design charge stock (hydrotreated heavy naphtha) should be placed in to the unit as soon as it is acceptable for charging, i.e. meets the following requirements:

Boiling Range As per design Total Sulfur 0.5 wt. ppm Total Nitrogen 0.5 wt. ppm Chlorides 0.5 wt. ppm Fluorides *(0.5 wt. ppm) Lead *(20 wt. ppb) Arsenic *(1 wt. ppb)

Water + Dissolved Oxygen + Combined Oxygen = Low enough to produce less than 5 mole ppm water in the recycle gas with no water injection.

*as low as the analytical method used for analysis is capable of detecting; parenthetical values are current UOP laboratory method limits.

NOTES:

1. Everything possible should be done to minimize the time non-hydrotreated feed is brought into the unit.

2. Until the charge stock meets the above requirements, the recycle gas moisture level is less than 200 ppm and the hydrogen sulfide in the recycle gas is less than 2 mole ppm, 482°C should not be exceeded on the reactor inlets.

b. When the moisture content of the recycle gas is below 200 mole ppm, the hydrogen sulfide content of the recycle gas is below 2 ppm, and the sulfur content of the feed to the Platforming is 0.5 wt. ppm or less (by the Nickel Reduction Method. UOP Method 357 or Microcoulometric Method, UOP No. 727 or Tracor Atlas, ASTM D- 4045), the reactor inlet temperature can be increased to 493°C.

c. As the unit continues to dry out, continue the chloride adjustment operation using the following program:

Recycle Gas Moisture (Mole ppm)

Chloride Addition Rate (Wt. ppm of Feed)

100-200 10

30-100 5

Below 30 Normal rate

NOTE: If the recycle gas moisture analyzer (013-AE-003) is not operating properly or cannot be properly calibrated, the following time schedule can be used as a guide to adjusting reactor temperatures and chloride injection rates:

1. Assume 2 days are required for the recycle gas moisture content to be reduced to 200 mole ppm.

2. Assume an additional 2 days are required for the recycle gas moisture content to be reduced to 30 mole ppm.

d. At 493°C reactor inlet temperatures (013-TIC-001, 013-TIC-003, 013-TIC-005 and 013-TIC-007) the octane response should be checked. If the response for a 2 RONC target increase is less than one clear octane number per 2-3°C increase in reactor inlet temperatures (WAIT), the catalyst chloride balance is low. In this event, consideration should be given to increasing the organic chloride injection rate several ppm for several days, and remaining at reduced severity until the octane response is back to normal. Alternatively, the reactor inlet temperatures can be reduced below 482°C, while still maintaining sufficient hydrogen production to keep the hydrogen users in operation; into the inlet of each reactor inject 0.1 to 0.2 wt-% chloride based on that reactor's pounds of catalyst over a minimum of 4 hours. This operation should be closely supervised. Before increasing severity recheck the unit octane response as discussed above.

e. When the recycle gas moisture content is less than 30 mole ppm, the reactor inlet temperatures may be increased to achieve the desired product octane. At the same time, the chloride injection rate should be reduced to normal. The normal chloride injection rate will be dictated by the Platforming Unit recycle gas moisture content and plant performance.

f. When the recycle gas moisture content decreases below 20 mole ppm, start the pump P-1304 to begin the injection of water (as clean steam condensate) to the feed to maintain the proper moisture content of the recycle gas. Typically 1 wt-ppm water in the feed equals 3 mole ppm moisture in the recycle gas. Assuming there is 0.5 to 1.0 wt-ppm dissolved water in the Naphtha Splitter bottoms product, the normal water injection rate would then be 4 to 4.5 wt-ppm based on the feed. Target moisture levels in the recycle gas are 15 to 25 mole ppm.

g. As the unit is equipped with a CCR section, the reactor catalyst level will slump for thermal and/or mechanical reasons after or during the Platforming unit startup; excess catalyst slump will be indicated by a low catalyst level alarm at the Reduction Zone (top of Reactor No. 1). Fresh catalyst must be transferred to the top of Reactor No. 1, to prevent loss of seal in Reactor No. 1 . Catalyst transfer will have to be accomplished by utilizing the regenerated catalyst transfer equipment (Lock Hopper No. 2 system). Refer to the Catalyst Regeneration Unit Operating Manual for this procedure.

13. COMMISSION THE RECOVERY PLUS SYSTEM

Purging and inerting by means of N2 of the refrigerant compression can be performed in

parallel of the purging of the net gas section.

The complete procedure and acceptance criteria of the RECOVERY PLUS purging are presented in the Vendor Operating Manual (8474L-013-A5016-4110-001-001 chapter IV §D) Introduce refrigerant in the system at the oil cooler X-1301-E-04 tubes side inlet and pressure the refrigerant circuit.

When normal operation conditions is reached, the RECOVERY PLUS system is lined up so as to treat gaseous effluent from the reactor. The main steps of the commissioning and start-up sequence are the following

a. Circulate Net Gas and Lean Oil, Establish liquid level in the Absorber X-1301-V01. b. Lube Oil Circulation

c. Refrigeration Section Start up d. Compressor X-1301-C01 Start UP

A detailed procedure of the commissioning and start up sequence is presented in the Vendor Operating Manual (8474L-013-A5016-4110-001-001 chapter IV §D)

14. SPECIFIC STARTUP PROCEDURES

14.1 HEATERS H-1301/1302/1303/1304 IGNITION PROCEDURE (NATURAL DRAFT HEATERS) TO BE COMPLETED AND REVIEWED ACCORDING TO VENDOR OP. MANUAL WHEN AVAILABLE

Introduction

Sequencing is required to ensure that operating events occur in proper order. The following sequence description is applicable to heaters H-1301/1302/1303/1304. The sequencing will permit a safe heater ignition by a series of interlocks that will be followed by appropriate action taken by the field operators. The sequence will permit the pilot gas to be admitted to the furnace after completion of a natural draft air purge, and will permit fuel to be admitted to the burners only when there is sufficient ignition energy to ignite the fuel as it enters the furnace. However, the sequence is based on starting the heaters from the field. Certain functions in this sequence will be accomplished by interlocks, others by the local operators. All corrective actions must be taken by the local operators.

The sequence described herebelow is applicable to first light-up of the heaters and all subsequent starts from cold state.

Preparation for starting shall include a thorough inspection as to ensure the readiness of the furnace for start-up. For this, follow the manufacturer’s instructions which are detailed in his technical book.

All safety shutoff valves shall be closed, solenoids deenergized. All manual valves on burners shall be closed.

Glossary of terms used:

♦ to reset a solenoid on a valve: to put the valve in its normal operating position (different from safety position).

Starting Sequence

The starting sequence shall be performed in the following order:

Natural draft heaters will be purged by natural draft with stack damper and air registers fully open. Purge completion shall be verify by a portable explosive-meter.

a. Open damper (valve 013-HV-620) and burner registers to purge position.

b. Perform heater purge by pressing “Start Purge” button on local panel 013-HS-604. The interlock will check (by means of limit switches) that:

1. all safety shut-off valves on fuel and pilot lines to heater are closed (bleed valve on