CN202016980U - Dry-wet combined coke quenching device - Google Patents

Abstract

A dry-wet combined coke quenching device relates to a coke quenching device used in the coking process, and solves the problems of large occupied area, complex structure and serious burning loss of coke in the conventional dry coke quenching device and the problems of unrecyclable heat, wasted water resources, poor quality of coke and environmental pollution in the conventional wet coke quenching device. The dry-wet combined coke quenching device comprises a combined coke quenching furnace, a liquid-phase carrier heat recovery system, an inert gas heat recovery system and a steam recovery system, wherein the combined coke quenching furnace comprises a feeding system, an indirect dry coke quenching section, a steam coke quenching section, a water spraying device and a material discharge system. Most of high-temperature sensible heat is transferred to the liquid-phase medium in the liquid-phase carrier heat recovery system for reutilization through an indirect heat exchange method, and a small part of sensible heat is directly exchanged with inert gas for recovery to generate steam, so that the medium-temperature coke after reduction in temperature generates steam by water spraying, and the process of coke quenching is finished. The dry-wet coke quenching device can not only recycle heat, but also reduce coke burning loss, dust and pollutant emission and save investment.

Description

Dry and wet combined coke quenching device

technical field

The utility model belongs to coke quenching process equipment in the coking process, in particular to a coke quenching device combined with indirect dry coke quenching and steam coke quenching.

Background technique

At present, there are two coke quenching methods for coke ovens at home and abroad: dry coke quenching and wet coke quenching. Dry coke quenching is a coke quenching method that cools red coke with low-temperature inert gas. During the CDQ process, red coke is loaded from the top of the CDQ furnace, and the low-temperature inert gas is blown into the CDQ furnace by a circulating fan to absorb the heat of the red coke. The bottom is discharged, and the heated high-temperature inert gas passes through the boiler for heat exchange to generate steam. The cooled inert gas is blown back into the CDQ oven by the blower for recycling. Dry quenching is superior to wet quenching in terms of energy saving and coke quality improvement, but it occupies a large area, complex equipment structure, difficult manufacturing, high maintenance costs, large investment, and serious coke burning loss. For independent coking enterprises, the absorbed heat is not easy to balance. Therefore, CDQ is difficult to popularize in independent coking enterprises. Wet coke quenching is to spray red coke with water (including low-moisture coke quenching, stable coke quenching, etc.), reduce the red coke to below 100°C, and the steam generated is directly discharged into the atmosphere. It is characterized by simple process, low investment, and easy operation and maintenance. The disadvantages are: ① The sensible heat of red coke, which accounts for about 30-35% of the total heat consumption of coking, is not effectively used; Coke quality; ④The steam generated by coke quenching contains pollution, corrosive media and dust, and the discharge into the atmosphere is not only environmental pollution, but also a waste of heat energy.

Contents of the invention

The purpose of this utility model is to improve the existing coke quenching technology and provide a dry-wet combined coke quenching device to solve the problem that the existing dry coke quenching has a large area, complex structure, and serious coke burning loss; the wet coke quenching cannot Problems of heat recovery, waste of water resources, poor coke quality, and environmental pollution.

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A combined dry-wet quenching device, characterized in that: the coke quenching device is composed of a combined coke quenching oven, a liquid phase carrier heat energy recovery system, an inert gas heat energy recovery system, and a steam recovery system; material system, indirect coke quenching section, steam coke quenching section, water spray device, and discharge system; the feeding system is set on the upper part of the indirect coke coke The coke quenching section is connected, the water spray device is installed on the upper part of the steam coke quenching section, and the lower part of the steam coke quenching section is connected to the discharge system; the liquid carrier heat recovery system is connected to the indirect coke quenching section Indirect heat transfer, the inlet of the inert gas heat energy recovery system is connected below the indirect CDQ section, the outlet of the inert gas heat energy recovery system is connected above the indirect CDQ section, and the steam recovery system The inlet is the outlet of the water spraying device, and the outlet of the steam recovery system is at the lower part of the steam quenching section.

The unit coke quenching device of the indirect coke quenching section is provided with a central cooling sleeve outside and inside the wall, which becomes an integral part of the heat energy recovery system of the liquid phase carrier.

The inner wall of the indirect CDQ coke section is provided with fins.

Compared with the prior art, the utility model has the following advantages and beneficial effects.

1. The indirect CDQ section mainly uses indirect heat transfer to absorb the sensible heat in red coke, and some uses inert gas to directly transfer heat to absorb the sensible heat in red coke. The steam coke quenching section uses water spray to directly extinguish coke to reduce coke burning loss and reasonably recover heat energy , reduce coke quenching water consumption, and reduce pollutant emissions.

2. When the liquid phase carrier of the indirect CDQ coke section is water, it is similar to a fire tube boiler; when the liquid phase carrier is other media, the heating temperature of the liquid phase carrier is lower than the boiling point, so that the CDQ section is the same as the conventional waste heat boiler Combining the two into one simplifies the structure of the coke dry quenching device and saves the investment cost of the equipment.

3. During the coke quenching process in the steam quenching section, all the steam generated is recovered, which reduces the water consumption of coke quenching and greatly reduces environmental pollution.

4. When the steam quenching section is sprayed with water, because the coke temperature is medium temperature, it hardly produces CO2, CO, H2, CH4 and other harmful gases, which is safe to operate and has little impact on the environment.

Description of drawings

Fig. 1 is a schematic diagram of dry-wet combined coke quenching process;

Fig. 2 is a structural schematic diagram of a dry-wet combined coke quenching device;

Fig. 3 is a cross-sectional view along line A-A of Fig. 2 .

The utility model will be further described below in conjunction with the accompanying drawings through preferred embodiments.

Detailed ways

As shown in Figures 1, 2, and 3, a dry-wet combined coke quenching device is composed of a combined coke quenching oven 1, a liquid phase carrier heat energy recovery system 2, an inert gas heat energy recovery system 3, and a steam recovery system 4. The combined coke quenching oven 1 is composed of a feed system 1.1, an indirect CDQ section 1.2, a steam coke quenching section 1.3, a water spray device 1.4, and a discharge system 1.5. The feed system 1.1 is arranged on the upper part of the indirect CDQ section 1.2, the lower part of the indirect CDQ section 1.2 communicates with the steam coke quenching section 1.3, and the water spray device 1.4 is installed in the steam coke quenching section 1.3, the lower part of the steam coke quenching section 1.3 communicates with the discharge system 1.5; the liquid phase carrier heat energy recovery system 2 indirectly conducts heat with the indirect CDQ section 1.2; the inert gas heat energy recovery system 3 The inlet is connected below the indirect CDQ section 1.2, and the outlet of the inert gas heat energy recovery system 3 is connected above the indirect CDQ section 1.2; the inert gas is used as a carrier to directly transfer heat and recover heat energy to produce steam.

The inlet of the steam recovery system 4 is the outlet of the water spraying device 1.4, and the outlet of the steam recovery system 4 is at the lower part of the steam coke quenching section 1.3.

The unit coke quenching device 1.2.1 of the indirect CDQ section 1.2 is provided with a central cooling jacket 1.2.2 outside and inside the wall, which becomes a component of the liquid phase carrier heat energy recovery system (2).

The inner wall of the indirect CDQ section 1.2 is provided with fins 1.2.3.

The working process of the present utility model is as follows:

The red coke enters the indirect CDQ section 1.2 through the feeding system 1.1, and heats the liquid carrier in the liquid carrier heat recovery system 2 through red coke radiation heat conduction and heat transfer to recover heat energy. In order to ensure the slight positive pressure in the coke quenching oven, an appropriate amount of inert gas is added from the inert gas injection system 3 below the indirect CDQ section 1.2 to prevent air from entering and improve the heat transfer effect. When the temperature of high-temperature coke drops to medium temperature, steam enters In the coke quenching section 1.3, the water spraying device 1.4 is used to quantitatively control the spray water to generate steam and cool the coke. The temperature of the coke is cooled to below 100°C, and the coke is discharged through the discharge system 1.5. The steam is recovered through the steam recovery system 4.

Claims (3)

1. A dry-wet combined coke quenching device, characterized in that: the coke quenching device consists of a combined coke quenching oven (1), a liquid phase carrier heat energy recovery system (2), an inert gas heat energy recovery system (3), a steam recovery The system (4) constitutes; the combined coke quenching oven (1) is composed of a feed system (1.1), an indirect CDQ section (1.2), a steam coke quenching section (1.3), a water spray device (1.4), and a discharge system ( 1.5) composition, the feed system (1.1) is arranged on the upper part of the indirect CDQ section (1.2), and the lower part of the indirect CDQ section (1.2) communicates with the steam coke quenching section (1.3), the The water spray device (1.4) is installed on the upper part of the steam coke quenching section (1.3), and the lower part of the steam coke quenching section (1.3) communicates with the discharge system (1.5); the liquid phase carrier heat recovery system ( 2) Indirect heat transfer with the indirect CDQ section (1.2); the inlet of the inert gas heat recovery system (3) is connected below the indirect CDQ section (1.2), and the inert gas heat recovery system ( 3) the outlet is connected above the indirect CDQ section (1.2); the inlet of the steam recovery system (4) is the outlet of the water spray device (1.4), and the steam recovery system (4) The outlet is at the bottom of the steam quenching section (1.3). 2. The dry-wet combined coke quenching device according to claim 1, characterized in that: a central cooling jacket (1.2 .2), becoming an integral part of the liquid phase carrier heat energy recovery system (2). 3. The dry-wet combined coke quenching device according to claim 1, characterized in that: the inner wall of the indirect dry quenching coke section (1.2) is provided with fins (1.2.3).

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