CN102000473A

CN102000473A - Roast tail gas treatment method in production of catalytic cracking catalyst

Info

Publication number: CN102000473A
Application number: CN 201010560250
Authority: CN
Inventors: 廖明球
Original assignee: YUEYANG YITIAN CHEMICAL CO Ltd
Current assignee: YUEYANG YITIAN CHEMICAL CO Ltd
Priority date: 2010-11-26
Filing date: 2010-11-26
Publication date: 2011-04-06

Abstract

The invention mainly relates to a roast tail gas treatment method in the production of the catalytic cracking catalyst. The method comprises the following steps: the roast tail gas is used as a part of the heat source of a drying tower to be introduced in the tower; after the heat exchange, the roast tail gas enters a cyclone separator with the dry tail gas; and the separated gas phase enters a tail gas treatment system for treatment. In the method of the invention, the roast tail gas with a lot of heat which is generated in the roasting process of the catalytic cracking catalyst is directly introduced in the existing catalyst spray drying system for heat recovery, thus the heat recovery rate is high; and the roast tail gas and the dry tail gas of the catalyst spray drying system are treated together, thus the process is simplified and the aims of energy-saving, consumption-reducing, less sewage discharge and investment-saving are achieved.

Description

The processing method of roasting tail gas during catalytic cracking catalyst is produced

Technical field

The invention belongs to catalytic cracking catalyst fabricating technology field, relate generally to the treatment process of the roasting tail gas in the catalytic cracking catalyst production process.

Background technology

Roasting technique flow process during the conventional catalyst Cracking catalyst is produced is specifically seen Fig. 2.Roasting furnace gas burning generation flue gas enters heat exchanger and cold air carries out arranging atmosphere after the exchange heat, and the hot-air after the heating is sent into roaster as combustion air through pressure fan, carries out heat recovery and reaches purpose of energy saving.The waste gas that produces after the catalytic cracking catalyst roasting, through cyclone separator gas, the solid separation, gas phase enters saturator, to its chilling, temperature is reduced to below 80 ℃ by about 550 ℃, washs through scrubbing tower again with cooling water, during liquid phase enters and settling tank, gas phase is entered in the atmosphere by air-introduced machine.The subject matter that this technological process exists is: (1) is though flue gas reclaims heat through heat exchanger, but efficient is low, and the flue gas that carries a large amount of heats directly discharges, and the waste gas that produces after the catalytic cracking catalyst roasting, heat does not carry out reuse, causes the total amount of heat rate of recovery low; (2) waste gas of catalyst roasting generation is in processing procedure, and chilling needs a large amount of cooling waters, causes waste discharge height, energy consumption height; (3) in order to overcome HCl corrosion problems in the waste gas, the saturator chilling has partly adopted Hastelloy Hastelloy C-276 material, it all has good corrosion resisting property to low temperature and middle thermohaline acid, and air-introduced machine require to use the resistance to spot corrosion, acid etching, stress corrosion strong especially, chloride is had the titanium alloy material manufacturing of good resistance to corrosion, cost an arm and a leg, the cost of investment height.

Summary of the invention

The present invention seeks to propose a kind of heat recovery rate height, waste discharge is few, energy consumption is low and invests the processing method of the low catalytic cracking catalyst roasting tail gas in producing.

Content of the present invention is achieved through the following technical solutions: the processing method of roasting tail gas during a kind of catalytic cracking catalyst is produced, it is characterized in that: the part of roasting tail gas as the drying tower thermal source fed in the tower, the roasting tail gas and the dried tail gas that carry out after the heat exchange together enter cyclone separator, and the gas phase of telling enters exhaust treatment system and handles.

The waste gas that described roasting tail gas generates when being meant the catalytic cracking catalyst roasting after cyclone separator separates gas phase and the mixture of flue gas.

Described dried tail gas is meant the gas that catalytic cracking catalyst produces in spray-drying process.

The drying tower that adopts among the present invention, cyclone separator and exhaust treatment system are existing device and systems in the spray-drying cell mesh that has now in the conventional catalyst Cracking catalyst fabricating technology field.

Because contain HCl in the waste gas that the catalytic cracking catalyst roasting process produces, its corrosivity has caused the problem of heat recovery difficulty.The present invention directly will contain the roasting tail gas of HCl and introduce in the catalyst spray-drying system that has now in the catalytic cracking catalyst fabricating technology field, because Cracking catalyst spray-drying unit is the negative pressure system, negative pressure reaches 60mmH relatively ₂More than the O, and the metal surface that contacts with medium in the system adheres to one deck catalyst, contain HCl tail gas difficulty be diffused into the metal surface, the HCl of metal surface divides and forces down, then HCl is less to the corrosivity of equipment, thereby the recovery of heat is not had considerable influence.

Major advantage of the present invention is: produces the existing catalyst spray-drying system of the direct introducing of the roasting tail gas that carries a large amount of heats in the catalytic cracking catalyst roasting process and carries out heat recovery, thereby heat recovery rate height; And roasting tail gas and catalyst spray-drying tail gas are handled together, thereby flow process simplified, and have reached the purpose that energy-conservation, consumption reduction, sewage discharge are few, reduce investment outlay.

Description of drawings

Fig. 1 is a technological process block-diagram of the present invention;

Fig. 2 is the roasting technique flow diagram during the conventional catalyst Cracking catalyst is produced.

The specific embodiment

The invention will be further described with the specific embodiment with reference to the accompanying drawings below:

By the technological process in shown in Figure 1, combustion gas fully mixes with the air that pressure fan is sent into, and produces flue gas more than 600 ℃ in the roaster internal combustion.Simultaneously, catalyst rises to 550 ℃ by 130 ℃ and produces large quantity of exhaust gas in roaster, through cyclone separator gas, after solid the separation, gas phase and flue gas are directly introduced in the Cracking catalyst spray-drying unit negative pressure system drying tower, part as drying source, carry out heat recovery, and mix, after cyclone separator is told gas phase, together send into exhaust treatment system and handle with catalytic cracking catalyst spray-drying tail gas.So both ensured the heat high-recovery, catalytic cracking catalyst roasting unit negative pressure is guaranteed.

With the midget plant that produces 600 ℃ of 12 tons of catalyst, sintering temperature an every day is example, adopts the present invention and catalytic cracking catalyst spray-drying unit.Combustion heat value 7570Kcal/ Nm ³Refinery gas, consumption is by original 120Nm ³/ h reduces to 35Nm ³/ h, sewage discharge reduces 2.4t/h, and reduce investment outlay more than 1,000,000 in catalyst roasting unit.This external equipment operation, maintenance cost reduced more than 50,000/year.

Claims

1. the processing method of roasting tail gas during a catalytic cracking catalyst is produced, it is characterized in that: the part of roasting tail gas as the drying tower thermal source fed in the tower, the roasting tail gas and the dried tail gas that carry out after the heat exchange together enter cyclone separator, and the gas phase of telling enters exhaust treatment system and handles.

2. processing method according to claim 1 is characterized in that: the waste gas that described roasting tail gas generates when being meant the catalytic cracking catalyst roasting after cyclone separator separates gas phase and the mixture of flue gas.

3. processing method according to claim 1 is characterized in that: described dried tail gas is meant the gas that produces in the catalytic cracking catalyst dry run.