A delayed coking processing method of oil sand pitch

A technology of delayed coking and processing method, which is applied in the field of delayed coking processing of oil sand asphalt, which can solve problems such as easy abrasion, increased equipment maintenance and repair costs, and heating temperature limitations, so as to reduce maintenance and maintenance costs, slow down the tendency of coking, and improve abrasion Effect

Active Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The final impact on the economic benefits of delayed coking unit
[0010] The existing delayed coking process for blending asphalt oil has the following problems: (1) Asphalt and residual oil are heated together, and the heating temperature is limited by the coking temperature of the residual oil, and asphalt is easy to coke in the heating furnace tube, which affects the heat transfer and heating of the furnace tube (2) Asphalt contains a large number of fine sand particles, which can promote the coking of residual oil
At the same time, fine sand particles with high hardness are easy to wear the key equipment such as heating furnace feed pump, heat exchanger, heating furnace tube, etc., increasing the cost of equipment maintenance and repair

Method used

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  • A delayed coking processing method of oil sand pitch
  • A delayed coking processing method of oil sand pitch
  • A delayed coking processing method of oil sand pitch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, bituminous oil b is obtained from the mined oil sands after washing with water as the raw material, and is sent to a separately established bitumen raw material tank 4, and the bitumen oil is sent to a separately established bitumen oil heating furnace through the bitumen feed pump 5 at the bottom of the tank 3 Carry out the first coking reaction and heat it to 495-505°C to form g of high-temperature asphalt oil.

[0034] The residual oil a enters the residual oil raw material buffer tank 1, and enters the residual oil heating furnace 2 through the residual oil feed pump 8 for the second coking reaction, and is heated to 490°C to become the high-temperature residual oil h.

[0035] High-temperature bitumen oil g and high-temperature residue oil h are mixed to form a mixed feedstock oil. The blending ratio of bitumen oil is 1%, and it enters the coke tower 6 through the four-way valve 9 for the third coking reaction. The reaction temperature is 490°...

Embodiment 2

[0037] Such as figure 1 As shown, bituminous oil b is obtained from the mined oil sands after washing with water and sent to a separately established bitumen raw material tank 4, and the bitumen oil b is sent to a separately established bitumen oil heating through the bitumen feed pump 5 at the bottom of the tank Furnace 3 undergoes the first coking reaction and is heated to 500°C to form g of high-temperature asphalt oil.

[0038] The residual oil a enters the residual oil raw material buffer tank 1, and enters the residual oil heating furnace 2 through the residual oil feed pump 8 for the second coking reaction, and is heated to 500° C. to become the high-temperature residual oil h.

[0039] The high-temperature asphalt oil g and the high-temperature residue oil h are mixed to form the mixed raw material oil i. The blending ratio of the high-temperature asphalt oil g is 10%, and enters the coke tower 10 through the four-way valve 9 for the third coking reaction. The reaction temp...

Embodiment 3

[0041] Such as figure 1 As shown, bituminous oil b is obtained from the mined oil sands after washing with water and sent to a separately established bitumen raw material tank 4, and the bitumen oil b is sent to a separately established bitumen oil heating through the bitumen feed pump 5 at the bottom of the tank Furnace 3 performs the first coking reaction and is heated to 505°C to form g of high-temperature asphalt oil.

[0042] The residual oil enters the residual oil raw material buffer tank 1, and enters the residual oil heating furnace 2 through the residual oil feed pump 8 for the second coking reaction, and is heated to 505°C to become the high-temperature residual oil h.

[0043] The high-temperature asphalt oil g and the high-temperature residue oil h are mixed to form the mixed raw material oil i. The blending ratio of the high-temperature asphalt oil g is 20%, and enters the coke tower 6 through the four-way valve 9 for the third coking reaction. The reaction temperatur...

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Abstract

The invention discloses a delayed coking processing method of oil sand bitumen. The delayed coking processing method comprises the following steps: performing the primary coking reaction by adopting asphalt oil as a raw material, heating the asphalt oil to 495 to 550 DEG C, at the same time, performing the secondary coking reaction on a coked raw material except for the asphalt oil in a residue oil heating furnace, mixing products of the primary coking reaction and the secondary coking reaction, performing the tertiary coking reaction, generating light-weight products and coke, after a cokingreactor is fully filled with the coke, enabling the raw material of the tertiary coking reaction to enter another coking reactor, hydraulically decoking the coke remaining in the original coking reactor, and circularly utilizing the coke. By adopting the method, the corrosion of fine-sand-containing particles in the raw material for the delayed coking apparatus can be reduced, and the maintenancecost of the device can be decreased. Meanwhile, the asphalt heating temperature can be independently controlled, the coking trend of a heating furnace tube can be slowed down, and the yield of liquidproducts can be increased.

Description

Technical field [0001] The invention relates to a petroleum coking process, in particular to a delayed coking processing method of oil sand pitch. Background technique [0002] Delayed coking is a residual oil conversion technology widely used in refineries. It is the main means of lightening residual oil in the United States, China, Venezuela, India, Canada and other countries. There are more than 170 sets of residual oil delayed coking units in operation worldwide, with a total processing capacity Above 400 million tons, my country's delayed coking processing capacity in 2012 has reached 113 million tons. [0003] Oil sand is a mixture of asphalt, water, sand and clay, which contains about 20% (mass fraction, the same below) of asphalt, and some heavy metals and sulfur. It has a relatively high viscosity and cannot flow at room temperature. The surface of each sand grain is covered by a thin layer of water, which separates the sand grains from the outermost asphalt layer. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G51/02C10G55/00
CPCC10G51/02C10G55/00C10G2400/02C10G2400/04
Inventor 张东明娄立娟张艳梅刘银东于志敏卢竟蔓许倩王丽涛张璐瑶侯经纬毕秦岭崔晨曦鄂宇恒
Owner PETROCHINA CO LTD
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