Pot furnace low-temperature calcination process

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/cm.sup.3.

Claims

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/cm.sup.3; wherein the flame path temperature is controlled to be less than 1250° C.

2. 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.

3. 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.

4. 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.

5. 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.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1 is a cross-sectional view of the flame path portion of the present invention.

(2) In the FIGURE:

(3) 1 flame path,

(4) 2 pot,

(5) 3 volatile channel,

(6) 4 the first flame path layer flashboard,

(7) 5 the first flame path layer,

(8) 6 the eighth flame path layer,

(9) 7 furnace bottom cooling channel,

(10) 8 main flue.

EMBODIMENTS

(11) The present invention will be described below in detail with reference to the embodiments, which, however, do not limit the protection scope of the present invention.

(12) As shown in FIG. 1, the calcination material petroleum coke comes from top to bottom to undergo the whole calcination process in the pot 2. The high temperature flue gas flows in the flame path 1 to realize indirect heating of the petroleum coke.

(13) By controlling the flame path temperature and discharge speed of the pot furnace, it is ensured 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. The flame path includes eight layers.

(14) The combustion-supporting air is the cold air in the environment which is sucked directly into the flame path through the first flame path layer via the negative pressure in the flame path to support the combustion, ensuring that the temperature in the flame path is below 1250° C.

(15) The air inlet of the first flame path layer is provided with a flame path flashboard for controlling the amount of cold air into the flame path.

(16) Air within the pot furnace bottom cooling channel 7 is discharged directly out of the vent at the top of the furnace, without participating in supporting the combustion in the flame path.

(17) The negative pressure in the main flue 8 reaches −250 Pa˜−300 Pa, the negative pressure in the eighth flame path layer 6 reaches −120 Pa˜−150 Pa, and the negative pressure in the first flame path layer 5 reaches −30 Pa˜−40 Pa. A sufficiently large negative pressure ensures that sufficient cold air enters the flame path and reduces the temperature in the flame path. Meanwhile, a great negative pressure can improve the uniformity of temperatures in all flame path layers.

(18) The amount of volatiles, which precipitates from the petroleum coke per unit time and enters the flame path for combustion, increases 10% to 20%. The amount of volatiles combusted in the flame path and the flue gas flow in the flame path are increased while reducing the residence time of the petroleum coke in the furnace.

(19) The volatiles of the petroleum coke enter the first flame path layer 5 via the volatile channel 3. The combustion-supporting air enters the first flame path layer 5 via the first flame path layer flashboard 4 as a result of the negative pressure in the flame path. Meanwhile, the amount of air that enters the first flame path layer 5 is controlled by adjusting the first flame path layer flashboard 4, to ensure that the temperature in the flame path is below 1250° C.