JP3384592B2 - Molded coke production equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upright continuous production facility for molded coke using circulating gas as a heat medium. 2. Description of the Related Art The continuous-type coke production equipment, so-called FCP equipment itself, is widely known as described in Japanese Patent Application Laid-Open No. 56-47234. FIG. 3 shows a process flow chart in the continuous molding coke manufacturing facility. [0004] In FIG.
Supplies or products are indicated by letters. [0005] In the figure, molded coal A produced in a molded coal production facility 1 is introduced from the top of an upright continuous carbonization furnace 2 and cooled at a low temperature introduced from a tuyere 3 in an intermediate portion of the upright continuous carbonization furnace 2. The coke is sequentially heated and carbonized by the carbonization gas B and the high-temperature carbonization gas C introduced from the tuyere 4 at a position lower than the carbonization gas B, and the obtained coke descends to the cooling zone at the lower part of the upright continuous carbonization furnace 2, and Is cooled by the cold gas D introduced from the tuyere 5 and is cut out as molded coke E by the discharge device 6. The gas generated during the carbonization of the formed coal A is mixed with high-temperature and low-temperature carbonized gas to form a furnace top gas F from the furnace top through a gas cooler or a sensible heat recovery device 7.
After the dust is removed by the dust collector 9 through the gas cooler 8, a part of the dust is sent to the collection facility 10 as the collection gas G. Most of the other dust removal gas is circulated and blown into the upright continuous carbonization furnace 2 as the low-temperature carbonization gas B, the high-temperature carbonization gas C, and the cold gas D as the circulation gas H. [0007] Except for the part of the circulating gas H that is introduced into the bottom of the carbonization furnace 2 as the cold gas D, it is partially heated by the low-temperature carbonization gas heater 11 and then ejected by the ejector 1.
After being mixed with the extraction gas K from the lower part of the furnace through the furnace 2, the mixture is introduced into the carbonization furnace 2 as a low-temperature carbonization gas B, and the others are heated to a high temperature of about 1050 ° C. The gas C is introduced into the dry distillation furnace 2. A part J of the cooling gas D introduced from the lower part of the carbonization furnace rises in the carbonization furnace without being extracted, is mixed with the high-temperature carbonization gas, and becomes the furnace top gas F together with the generated gas. In this conventional method, the high-temperature carbonized gas introduced from the high-temperature tuyere must be cooled once in the gas circulation system and reheated to a high temperature. Requires a vessel. Further, Japanese Patent Application Laid-Open No. Hei 5-17779 discloses that
Disclosed is a method in which air is introduced into the circulating gas without using an expensive indirect heater for high temperature, and a part of the circulating gas, which is a combustible gas, is burned to raise the temperature of the circulating gas to produce a high-temperature carbonized gas. However, in this method, the top gas is diluted,
There is a problem that the calories of the recovered gas decrease. In addition, since the partial combustion is performed, generation of soot cannot be avoided, and there is a problem that the gas flow path is blocked due to the adhesion of soot. The problem to be solved by the present invention is to eliminate the need for expensive high-temperature indirect heaters and to increase the caloric content of the recovered gas in such a molded coke production facility. To provide a molded coke manufacturing facility. [0011] The present invention relates to a molded coke production equipment by dry distillation having a two-stage tuyere having a low-temperature tuyere above and a high-temperature tuyere below. Combustible gas is blown as a heat medium and collected from the furnace top,
And heat air or combustion exhaust gas from the hot tuyere
Blown out , and discharged from an extraction tuyere provided below the high-temperature tuyere, so that the heat medium is
It is a molding coke manufacturing facility for recirculating molding coal characterized by a downward flow . [0012] The generated gas in the area above the low-temperature tuyere is subjected to carbonization of the formed coke as a heat medium of an upward flow in the furnace, and the inert heat medium introduced from the high-temperature tuyere at the lower position is used for the high-temperature impeller. The extraction tuyere located below the mouth
Tuyere extracted by the pressure of a chimney or an ejector
Extracted from This allows the hot tuyeres to introduce
The heated heat medium forms a downward flow in the furnace. That
As a result, the recovery collected from the furnace top between the low and high temperature tuyeres
The formation of a seal zone that prevents a decrease in the calorific value of gas
In addition, the calorific value of the recovered gas collected from the furnace top is prevented from being reduced, and the charcoal is carbonized and cooled using an inert gas below the high-temperature tuyere as a heat medium. Embodiment 1 FIG. 1 shows an example in which air is directly introduced from a high-temperature tuyere 4 of a vertical continuous carbonization furnace 2. In FIG. 1, the same portions, the same materials, and the same gases as those of the conventional vertical continuous carbonization furnace are denoted by the same reference numerals. As shown in the figure, the furnace top gas F from the top of the upright continuous carbonization furnace 2 was removed from the furnace top by a sensible heat recovery device or a gas cooler 7 and a gas cooler 8 and a dust collector 9. Thereafter, a part is sent to the recovery facility 10 as a recovery gas G. Most of the other dust removal gas is introduced as circulating gas H through the low temperature carbonization gas heater 11 as low temperature carbonization gas B from the tuyere 3 into the carbonization furnace 2 to form a circulation system. Low-temperature carbonization gas B introduced into the carbonization furnace 2
Is heated to a predetermined temperature, and is recovered as the top gas F without causing a decrease in the calories of the top gas recovered from the furnace top. Between the inlet tuyere 3 for the low-temperature carbonized gas B in the middle and the inlet tuyere 4 for the combustion air at a lower position, a region in which the heat medium gas does not flow, that is, a gas seal zone 20 is formed. . Combustion air L is introduced from the tuyere 4 at a lower position, generates gas and burns in an upright type carbonization furnace, and after the molded coke is heated to a predetermined temperature, the lower extraction tuyere. The exhaust gas is discharged as a circulating exhaust gas M from 14. The cooling gas D introduced from the lower tuyere 5 cools the molded coke, and after heat exchange with the molded coke, the extracted tuyere 14 as a circulating exhaust gas M together with the combustion gas of the combustion air L.
After heating the boiler 15, most of it is circulated and supplied to the tuyere 5 below. In this process, by adjusting the pressure of the circulating gas B introduced from the tuyere 3 at the intermediate portion and the pressure from the tuyere 4 at a lower position, a region in which the heat medium gas does not flow, that is, a gas seal zone 20 can be recovered and circulated without lowering the calories of the furnace top gas F without destroying the furnace top gas F. Embodiment 2 FIG. 2 shows an example in which flue gas is introduced from the second-stage tuyere 4 of the vertical continuous carbonization furnace 2. As in FIG. 1, the top gas F from the top of the upright continuous carbonization furnace 2 is partially recovered gas G as recovery gas 1.
The remaining circulating gas H recovered in the indirect heat exchanger 17
To form a circulating system which is introduced from the tuyere 3 into the dry distillation furnace 2 as the low-temperature dry distillation gas B. The circulating gas H introduced into the carbonization furnace 2 raises the temperature of the formed coke to a predetermined temperature in the carbonization furnace 2 and reduces the calorie of the furnace gas recovered from the furnace top without lowering the calorie. Collected as top gas F. The tuyere 3 in the middle and the tuyere 4 in the lower position
A region in which the heat medium gas does not flow, that is, a gas seal zone 20 is formed between the two. Further, a combustion furnace 16 for heating high-temperature carbonized gas is provided as a direct heater from the tuyere 4 at the lower position, and a high-temperature carbonized gas is obtained from the flue gas and introduced from the second-stage tuyere 4. As a result, only the calories required for raising the temperature can be supplied by complete combustion, and there is no generation of unburned pyrolytic carbon, thereby enabling operation without adversely affecting the furnace condition. Naturally, there is no need for soot removal operation, and there is no reduction in the calories of the recovered gas. After being discharged from the lower extraction tuyere 14 together with the cold gas introduced from the lower tuyere 5 and heated in the heat exchanger 17,
A part is discharged and the rest is circulated to the lower tuyere 5. In each of the above embodiments, the extraction port 14
The extracted high-temperature inert gas does not contain tar or the like, and can be effectively used such as heat recovery by a boiler or temperature rise of a low-temperature carbonized gas by an indirect heater. According to the present invention, the following effects can be obtained. (1) Since the recovery system and the combustion discharge system are separated, a high concentration of recovered gas can be obtained. (2) Since the high-temperature carbonized gas heating system can perform complete combustion, it does not generate soot that adversely affects the operation. (3) Since an expensive indirect heater for high temperature is not required, equipment costs can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention. FIG. 2 shows a second embodiment of the present invention. FIG. 3 shows a conventional example. [Description of Signs] 1 Molded coal production equipment 2 Upright continuous dry distillation furnace 3 Tuyere in the middle part 4 Tuyere at the lower position 5 Tuyere at the bottom 6 Discharge device 7 Sensible heat recovery device 8 Gas cooler 9 Dust collector 10 Recovery equipment 11 Low temperature carbonization gas heater 12 Ejector 13 High temperature carbonization gas heater 14 Extraction tuyere 15 Boiler 16 Heater 17 Heat exchanger 20 Gas seal zone A Molded coal B Low temperature carbonization gas C High temperature carbonization gas D Cold gas E Carbonization coke F Furnace top gas G Collected gas H Circulating gas K Furnace gas L Combustion air M Extracted gas

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C10B 53/08

Claims (1)

(57) [Claim 1] In a molded coke production facility by dry distillation having a two-stage tuyere having a low-temperature tuyere at the top and a high-temperature tuyere at the bottom, it is more flammable than the low-temperature tuyere. Gas is blown as a heat medium, collected from the furnace top, and combustion air or combustion exhaust gas is blown as a heat medium from a high-temperature tuyere, and discharged from an extraction tuyere provided below the high-temperature tuyere.
And a molding coke manufacturing facility for recirculating molding coal , wherein the heating medium is made to flow downward in the furnace.