# US 11,306,254 B2 · Pot furnace low-temperature calcination process

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,306,254 B2
- Document ID: US11306254B2
- Status: Granted
- Kind: B2
- Application number: 15/510,372
- Filed: 2015-09-10
- Published: 2017-09-14
- Granted: 2022-04-19
- Earliest claimed: 2014-09-10
- Assignees: China Aluminum International Engineering Corporation Limited
- Applicants: China Aluminum International Engineering Corporation Limited
- Inventors: Chaodong Liu; Shanhong Zhou; Haifei Xu; Yi Sun; Yinhe Cui
- Web page: https://patentgrep.com/patent/US11306254B2

## CPC

- C10B 57/005: {After-treatment of coke, e.g. calcination desulfurization}
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- C10L 9/08: by heat treatments, e.g. calcining
- C01P 2006/10: Solid density
- Y02P 20/129: Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
- C10B: DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS (cracking oils C10G; underground gasification of minerals E21B43/295)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A pot furnace low-temperature calcination process may ensure that, by controlling the flame path temperature and discharge speed of the pot furnace, that the range of the temperature at which the petroleum coke is calcined in the pot is from 1150° C. to 1220° C., and that the discharge speed is 10 to 20% higher than the normal discharge speed and reaches 110˜120 kg/h, reducing the amount of desulfurization of the petroleum coke during the calcination so that the true density of the calcined coke is between 2.05 and 2.07 g/cm3.

## Claims

### Claim 1

A pot furnace low-temperature calcination method comprising:
providing a pot;
providing a flame path proximate to the pot such that heat from the flame path heats the pot;
controlling a flame path temperature and discharge rate of the pot furnace such that petroleum coke is calcined in the pot at a temperature range from 1150° C. to 1220° C., the discharge rate of the pot being controlled to be 110˜120 kg/h; and
reducing an amount of desulfurization of the petroleum coke during calcination so that true density of the calcined coke is between 2.05 and 2.07 g/cm3;
wherein the flame path temperature is controlled to be less than 1250° C.

### Claim 2 (depends on 1)

The pot furnace low-temperature calcination method according to claim 1, wherein the flame path comprises a first flame path layer among a plurality of flame path layers, the first flame path layer being a furthest flame path layer from the pot;
wherein the controlling a flame path temperature further comprises introducing combustion-supporting air which is cold air from an exterior environment into the first flame path layer by applying a negative pressure in the flame path, ensuring that temperature in the flame path is below 1250° C.

### Claim 3 (depends on 2)

The pot furnace low-temperature calcination method according to claim 2, wherein the first flame path layer further comprises a valve for controlling and adjusting an amount of cold air into the flame path.

### Claim 4 (depends on 1)

The pot furnace low-temperature calcination method according to claim 1, wherein air within a bottom cooling channel provided between the flame path and the pot is discharged directly, without participating in supporting combustion in a flame path.

### Claim 5 (depends on 2)

The pot furnace low-temperature calcination method according to claim 2, further comprising:
providing a main flue in communication with the flame path;
wherein the applying a negative pressure in the flame path comprises applying a negative pressure in the main flue;
wherein the negative pressure in a main flue is in a range of −250 Pa˜−300 Pa;
wherein the plurality of flame path layers comprises eight flame path layers;
wherein an eighth flame path layer of the eight flame path layers is a flame path layer closest to the pot; and
a negative pressure in an eighth flame path layer is in a range of −120 Pa˜−150 Pa; and
wherein a negative pressure in a first flame path layer is in a range of −30 Pa˜−40 Pa.