CN1134971A

CN1134971A - Utilization system for dry gas from catalytic cracking unit

Info

Publication number: CN1134971A
Application number: CN 96102435
Authority: CN
Inventors: 游同想; 李华旺; 游江波
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-01
Filing date: 1996-03-01
Publication date: 1996-11-06
Anticipated expiration: 2016-03-01
Also published as: CN1045458C

Abstract

A pipe is guided out before the pressure controlling valve PV1 which is connected to the dry gas pipe of the catalytic reaction equipment and on the additional pipe is connected to the pressure controlling valve PV2 which is used to reduce the stable pressure. The gas passes through gas-liq. separation tank R2 and enters into the atmospheric pressure furnace. Another pipe is guided out from the pipe after the pressure controlling valve PV1 and is connected successively to the gas-liq. separation tank R3, main flow F3, pressure controlling valve PV3 and boiler gas burner. Utilization of the dry gas can be enhanced by the system and the fuel oil can be saved.

Description

The dry gas of catalytic cracking utilizes system

The present invention relates to a kind of refining catalytic cracked dry gas and utilize system, the dry gas that is particularly useful for medium and small refinery catalytic cracking utilizes system.

At present, because the dry gas pressure surge that catalytic cracking unit produces is too big, can not supply with the atmospheric unit fuel process furnace of refinery and make fuel, the fuel that most of medium and small refinerys are introduced into torch assembly falls, and causes huge waste, also some medium and small refinery is set up gas holder and is stored dry gas, be utilized after making its pressure-stabilisation, still, the gas holder cost is too high again, as: Jinan Refinery is set up one 2 ten thousand stere gas holder, spends 3,600,000 yuan; In the last few years, the dry gas that Luoyang Petrochemical engineering corporation of China PetroChemical Corporation produces 70,000 tons of/year heavy oil fluid catalytic cracking equipment utilizes system as shown in Figure 1, it is the dry gas output tube connection one voltage-controlled valve PV1 (PV303 control valve) from catalytic unit 1 (tower 304), on this valve, also connect pressure gauge PT1 and setter PRC1, and (pressure is between 0.4-0.6MPa) draws two pipelines on the pipeline before the above-mentioned voltage-controlled valve PV1, wherein pipeline returns the raw materials furnace and heating 6 of catalytic unit 1 through snubber (end shows among the figure), and another pipeline (in fact this pipeline does not have effect) connects waste heat boiler 2; And above-mentioned voltage-controlled valve PV1 (PV303) also draws two pipelines afterwards, and wherein a pipeline connection torch assembly 3 burns in vain, and another pipeline also advances torch assembly 3 then and burns with manually the high pressure dry gas being inserted low pressure pipeline 505.

In view of this, also draw a pipeline before the purpose of this invention is to provide a kind of voltage-controlled valve PV1 of the dry gas output channel at catalytic unit, this pipeline is communicated with voltage-controlled valve PV2 successively, knockout drum, until atmospheric pressure kiln, after above-mentioned voltage-controlled valve PV1, draw a pipeline again, be communicated with knockout drum R3 on this pipeline successively, under meter F3, voltage-controlled valve PV3, until the boiler gas burner, be communicated with voltage-controlled valve PV4 on the pipeline entering of torch assembly again.

The object of the present invention is achieved like this: a kind of dry gas of catalytic cracking utilizes system, on the dry gas output channel of catalytic unit, connect a voltage-controlled valve PV1, on the pipeline before this valve PV1, draw two pipelines, wherein pipeline is communicated with the fuel process furnace of catalytic unit, and another pipeline is communicated with waste heat boiler; And also draw two pipelines on the pipeline after the above-mentioned voltage-controlled valve PV1, wherein a pipeline is communicated with torch assembly, another pipeline is through low pressure pipeline, it is characterized in that: on the pipeline before the above-mentioned voltage-controlled valve PV1, also draw a pipeline, connect the voltage-controlled valve PV2 that reduces voltage stabilizing on this pipeline, and after knockout drum R2 enters atmospheric pressure kiln; Draw a pipeline on the pipeline after above-mentioned voltage-controlled valve PV1, this pipeline is communicated with knockout drum R3, under meter F3, voltage-controlled valve PV3 and boiler gas burner again successively; High pressure gas at above-mentioned torch assembly divides entering of flow container R4 to connect voltage-controlled valve PV4 on the pipeline in addition.

Because adopt such scheme: the dry gas utilization ratio improves greatly, save fuel oil, split the utilization of dry gas by producing 70000 tons of catalysis per year, but every day 10.5 tons of fuel saving oil.

The present invention is further described below in conjunction with drawings and Examples.

The dry gas of Fig. 1 prior art catalytic cracking utilizes system chart.

Fig. 2 exemplary embodiments block diagram of the present invention.

Increase before Fig. 3 exemplary embodiments voltage-controlled valve of the present invention PV1 and draw a pipeline synoptic diagram.

Increase after Fig. 4 exemplary embodiments voltage-controlled valve of the present invention PV1 and draw a pipeline synoptic diagram.

Fig. 5 exemplary embodiments torch assembly of the present invention enter the pipeline synoptic diagram.

Among the figure: 1 catalytic unit, 2 waste heat boilers, 3 torch assemblies, 4 atmospheric pressure kilns, 5 steam boilers, 505 low pressure dry gas pipelines, 6 fcc raw material process furnace, voltage-controlled valve PV1, pressure gauge PT1, setter PRC1, under meter F2, voltage-controlled valve PV2, pressure gauge PT2, setter PRC2, knockout drum R2, valve V2, knockout drum R3, under meter F3, voltage-controlled valve PV3, pressure gauge PT3, setter PRC3, valve V3, high pressure gas divides fluid cylinder R4, voltage-controlled valve PV4, differential pressure transmitter PT4, setter PIC4.

At first voltage-controlled valve PV1 (PV303) (genus prior art) the dry gas pressure before at the dry gas output channel of catalytic unit 1 is 0.4-0.6MPa, through under meter F2 (once showing FT001, secondary table FT α 001), the reduction voltage-stabilizing system of forming through voltage-controlled valve PV2 (PV001) pressure gauge PT2 (PT001) and setter PRC2 (PRC001) again, make dry gas reach 0.3MPa, then, enter in it from gas-liquid separation cylinder R2 (R107) sidewall, enter the low-voltage tube of atmospheric pressure kiln 4 again from its top; Tensimeter and liquidometer on the above-mentioned R2 (R107), jar internal pressure and the liquid level that can measure respectively, when liquid reach a certain height, just can open the valve V2 on the raffinate pipeline, utilize a jar interior 0.3MPa dry gas pressure, raffinate is back in the catalytic unit 1, also can utilizes the steam heating coil of outside at the bottom of the knockout drum R2, with raffinate vaporization in the jar and burn.

Again, at above-mentioned voltage-controlled valve PV1 (PV303) dry gas afterwards, be introduced into knockout drum R3 (R301), dry gas comes out from tank deck, (once show FT001 through under meter F3, secondary table FIQ001) again through voltage-controlled valve PV3 (PV001), the voltage-stabilizing system that pressure gauge PT3 (PT001) and setter PRC3 (PRC001) constitute, enter the gas burner of steam boiler 5 at last, and at the bottom of the raffinate of knockout drum R3 sinks to jar, when liquid level reach a certain height, the burner valve air outlet of steam boiler 5 is turned down, make a jar internal pressure rise to 0.2-0.4MPa, then, open the valve V3 on the raffinate pipeline, so, raffinate is urged in the device 1 (R201) pressure, also can utilize external steam heating coil at the bottom of the knockout drum R3, raffinate is heated vaporization combustion fall.

Again, at above-mentioned voltage-controlled valve PV1 (PV303) dry gas afterwards, high pressure gas through the torch pipe connection divides fluid cylinder R4 (genus prior art), the dry gas that comes out from this tank deck enters differential pressure transmitter PT4 (PT001) and setter PTC4 (PIC001) voltage-controlled valve PV4 (PV001), until torch assembly 3; When dry gas pressure during less than set-point 0.4MPa, to close through differential pressure transmitter PT4, setter PIC4, voltage-controlled valve PV4, dry gas just can all be utilized; When dry gas pressure during greater than set-point 0.4MPa, differential pressure transmitter PT4, setter PIC4 export a signal, and voltage-controlled valve PV4 is opened, and dry gas enters torch assembly 3, guarantees safety.

Claims

1, a kind of dry gas of catalytic cracking utilizes system, on the dry gas output channel of catalytic unit, connect a voltage-controlled valve PV1, draw two pipelines on the pipeline before this valve PV1, wherein pipeline is communicated with the fuel process furnace of catalytic unit, and another pipeline is communicated with waste heat boiler; And also draw two pipelines on the pipeline after the above-mentioned voltage-controlled valve PV1, wherein a pipeline is communicated with torch assembly, another pipeline is through low pressure pipeline, it is characterized in that: on the pipeline before the above-mentioned voltage-controlled valve PV1, also draw a pipeline, connect the voltage-controlled valve PV2 that reduces voltage stabilizing on this pipeline, and after knockout drum R2 enters atmospheric pressure kiln; Draw a pipeline on the pipeline after above-mentioned voltage-controlled valve PV1, this pipeline is communicated with knockout drum R3, under meter F3, voltage-controlled valve PV3 and boiler gas burner again successively; High pressure gas at above-mentioned torch assembly divides entering of flow container R4 to connect voltage-controlled valve PV4 on the pipeline in addition.