Dry quenching circulating gas supply and waste heat utilization system

Abstract

The utility model provides a dry quenching circulating gas supply and waste heat utilization system which comprises a circulating gas supply mechanism and a waste heat utilization mechanism, the circulating gas supply mechanism comprises a circulating gas outlet pipe, a circulating gas inlet pipe and a circulating gas pipeline, the circulating gas outlet pipe is connected with a primary dust remover, and the circulating gas inlet pipe is provided with a secondary dust remover and a circulating fan; the waste heat utilization mechanism comprises a dry quenching boiler, a heat pipe heat exchanger and a deaerator, the dry quenching boiler is connected between the circulating gas outlet pipe and the circulating gas pipeline, the heat pipe heat exchanger is connected with a circulating fan, a water inlet of the heat pipe heat exchanger is connected with a desalting cold water pipe, and a water outlet of the heat pipe heat exchanger is connected with the deaerator through a desalting hot water pipe; and the deaerator is connected with a water inlet of the dry quenching boiler through a boiler water supply pipe. According to the device, the circulating gas is purified, combusted, cooled, subjected to heat exchange and the like through the annular circulating gas channel and the dry quenching boiler, it is guaranteed that a system for circularly supplying gas to the dry quenching boiler operates safely and stably, meanwhile, waste heat in the circulating gas is recycled, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry coke quenching, and in particular to a dry coke quenching circulating gas supply and waste heat utilization system. Background Art

[0002] At present, there are two coke quenching processes in the coking industry. One is a quenching method using water as the quenching medium, and the other is a method of using inert gas as a circulating gas to exchange heat with the hot red coke in a dry quenching furnace to quench the red coke.

[0003] When dry quenching chemical coke, the high reactivity of chemical coke can lead to an increase in the combustible components in the dry quenching circulating gas. When the conventional natural air introduction method is used to burn the combustible components, it is difficult to control the combustible components within a safe range, and the dry quenching process gas contains a large amount of waste heat, and direct discharge will result in a large amount of resource waste.

[0004] Therefore, it is necessary to utilize the combustible components and waste heat in the CDQ circulating gas to achieve control of the combustible components and effective utilization of resources. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a CDQ circulating gas supply and waste heat utilization system, which utilizes an annular circulating gas duct and a CDQ boiler to purify, burn, cool and exchange the circulating gas, thereby ensuring the safe and stable operation of the system for circulating gas supply to the CDQ furnace, and at the same time, utilizing the waste heat in the circulating gas as a resource to save energy.

[0006] The utility model provides a coke dry quenching circulating air supply and waste heat utilization system, including a circulating air supply mechanism and a waste heat utilization mechanism, wherein:

[0007] The circulating air supply mechanism comprises a circulating air outlet pipe connected to the upper side wall of the dry quenching furnace and a circulating air inlet pipe connected to the lower side wall of the dry quenching furnace, the circulating air outlet pipe is connected to a primary dust collector, the circulating air inlet pipe is provided with a secondary dust collector and a circulating fan, and the air inlet of the secondary dust collector is connected to the circulating air pipeline;

[0008] The waste heat utilization mechanism includes a dry quenching boiler, a heat pipe heat exchanger and a deaerator. The dry quenching boiler is connected to the outlet end of the circulating gas outlet pipe, the outlet end of the dry quenching boiler is communicated with the circulating gas pipeline, the heat pipe heat exchanger is connected to the outlet end of the circulating fan, the water inlet of the heat pipe heat exchanger is connected to the desalinated cold water pipe, and its water outlet is connected to the deaerator through the desalinated hot water pipe, and the deaerator is connected to the water inlet of the dry quenching boiler through the boiler feed water pipe.

[0009] Preferably, the steam outlet of the dry coke quenching boiler is connected to the steam inlet of the deaerator through a steam pipe.

[0010] Preferably, the primary dust collector and the secondary dust collector are both connected to the coke storage tank.

[0011] Preferably, the circulating air supply mechanism is connected to the air supply pipe on the upper side wall of the dry quenching furnace.

[0012] Preferably, the heat pipe heat exchanger is connected to an air intake bypass pipe and a pressure regulating exhaust pipe, and the air intake bypass pipe is connected to the upper part of the CDQ furnace.

[0013] Preferably, it further comprises a dust removal mechanism, wherein the dust removal mechanism comprises a dust collecting hood, and the dry quenching furnace and a loading device arranged at the top of the dry quenching furnace and a discharging device arranged at the bottom thereof are respectively connected to the dust collecting hood through dust collecting pipes.

[0014] Preferably, the discharging device is connected to a desulfurization pipeline.

[0015] Working principle of the utility model: The dry quenching gas circulation supply and waste heat utilization system of the utility model, after the high-temperature circulating gas (900-980°C) is discharged from the circulating gas outlet, after the dust is removed by the primary dust collector, it enters the dry quenching boiler where the combustible gas is fully burned, and the desalted water is heated to prepare steam by using the waste heat and the heat energy generated by the combustion. After the circulating gas is burned, it is discharged from the dry quenching boiler (160-170°C), and after the secondary dust removal, it is assisted by the circulating fan, and after the heat exchange and temperature reduction by the heat pipe heat exchanger (below 130°C), it is sent to the dry quenching furnace through the circulating gas inlet pipe. At the same time, the heat pipe heat exchanger uses the medium heat of the circulating gas to heat the cold desalted water, and the hot desalted water enters the deaerator, and is heated and deoxygenated by steam and sent to the dry quenching boiler to prepare steam, and the steam can be sent to the deaerator as a heat source.

[0016] Beneficial effects of the utility model: The CDQ circulating gas supply and waste heat utilization system of the utility model circulates the circulating gas in a ring-shaped circulating pipeline composed of a circulating gas outlet pipe, a circulating gas inlet pipe and a circulating gas pipeline. During the circulation process, the combustible gas is burned and removed in the CDQ boiler. The circulating gas is dusted and purified before and after combustion, and finally sent to the CDQ furnace after heat exchange and cooling treatment, ensuring the safe and stable operation of the system for circulating gas supply to the CDQ furnace. At the same time, the CDQ boiler, heat pipe heat exchanger and deaerator are used to burn and cool the circulating gas, while the combustible gas and waste heat in the circulating gas are utilized as resources, reducing energy waste and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the dry coke quenching circulating gas supply and waste heat utilization system of the utility model.

[0018] In the figure: a circulating air supply mechanism 1, a circulating air outlet pipe 11, a circulating air inlet pipe 12, a primary dust collector 13, a secondary dust collector 14, a circulating fan 15, a circulating air pipeline 16, a coke storage tank 17, and an air supply pipe 18; a waste heat utilization mechanism 2, a dry coke quenching boiler 21, a heat pipe heat exchanger 22, a deaerator 23, a desalinated cold water pipe 24, a desalinated hot water pipe 25, a boiler feed water pipe 26, a steam pipe 27, an air intake bypass pipe 28, and a pressure regulating exhaust pipe 29; a dust removal mechanism 3, a dust collecting hood 31, a dust collecting pipeline 32, a desulfurization pipeline 33, a dry quenching furnace 4, a charging device 5, and a discharging device 6. DETAILED DESCRIPTION

[0019] In order to make the technical solution of the present utility model easier to understand, the technical solution of the present utility model is now clearly and completely described in the form of specific embodiments in combination with the accompanying drawings.

[0020] Embodiment 1:

[0021] like Figure 1 As shown, the CDQ circulating gas supply and waste heat utilization system of this embodiment includes a circulating gas supply mechanism 1 and a waste heat utilization mechanism 2, wherein:

[0022] The circulating air supply mechanism 1 comprises a circulating air outlet pipe 11 connected to the upper side wall of the dry quenching furnace and a circulating air inlet pipe 12 connected to the lower side wall of the dry quenching furnace, the circulating air outlet pipe 11 is connected to a primary dust collector 13, the circulating air inlet pipe 12 is provided with a secondary dust collector 14 and a circulating fan 15, and the air inlet of the secondary dust collector 14 is connected to a circulating air pipeline 16;

[0023] The waste heat utilization mechanism 2 includes a dry quenching boiler 21, a heat pipe heat exchanger 22 and a deaerator 23. The dry quenching boiler 21 is connected to the gas outlet end of the circulating gas outlet pipe 11, the gas outlet end of the dry quenching boiler 21 is communicated with the circulating gas pipeline 16, the heat pipe heat exchanger 22 is connected to the gas outlet end of the circulating fan 15, the water inlet of the heat pipe heat exchanger 22 is connected to the desalinated cold water pipe 24, and its water outlet is connected to the deaerator 23 through the desalinated hot water pipe 25, and the deaerator 23 is connected to the water inlet of the dry quenching boiler 21 through the boiler feed water pipe 26.

[0024] Embodiment 2:

[0025] like Figure 1 As shown, the CDQ circulating air supply and waste heat utilization system of this embodiment includes a circulating air supply mechanism 1, a waste heat utilization mechanism 2 and a dust removal mechanism 3, wherein:

[0026] The circulating air supply mechanism 1 comprises a circulating air outlet pipe 11 connected to the upper side wall of the dry quenching furnace and a circulating air inlet pipe 12 connected to the lower side wall of the dry quenching furnace, the circulating air outlet pipe 11 is connected to a primary dust collector 13, the circulating air inlet pipe 12 is provided with a secondary dust collector 14 and a circulating fan 15, the air inlet of the secondary dust collector 14 is connected to a circulating air pipeline 16; the primary dust collector 13 and the secondary dust collector 14 are both connected to a powder coke storage tank 17; the circulating air supply mechanism 1 is connected to an air replenishing pipe 18 on the upper side wall of the dry quenching furnace;

[0027] The waste heat utilization mechanism 2 includes a dry coke quenching boiler 21, a heat pipe heat exchanger 22 and a deaerator 23. The dry coke quenching boiler 21 is connected to the outlet end of the circulating gas outlet pipe 11, and the outlet end of the dry coke quenching boiler 21 is connected to the circulating gas pipeline 16. The heat pipe heat exchanger 22 is connected to the outlet end of the circulating fan 15. The water inlet of the heat pipe heat exchanger 22 is connected to the desalinated cold water pipe 24, and its outlet is connected to the deaerator 23 through the desalinated hot water pipe 25. The deaerator 23 is connected to the water inlet of the dry coke quenching boiler 21 through the boiler feed water pipe 26. The steam outlet of the dry coke quenching boiler 21 is connected to the steam inlet of the deaerator 23 through the steam pipeline 27; the heat pipe heat exchanger 22 is connected to the air intake bypass pipe 28 and the pressure regulating exhaust pipe 29, and the air intake bypass pipe 28 is connected to the upper part of the dry quenching furnace;

[0028] The dust removal mechanism 3 includes a dust collecting hood 31, and the dry quenching furnace and the loading device arranged on the top of the dry quenching furnace and the discharging device arranged on the bottom thereof are respectively connected to the dust collecting hood 31 through dust collecting pipes 32; the discharging device is connected to a desulfurization pipe 33.

[0029] It should be noted that the embodiments described herein are only partial embodiments of the present invention, rather than all implementations of the present invention, and the embodiments are only exemplary, and their role is only to provide a more intuitive and clear way to understand the content of the present invention, rather than to limit the technical solutions described in the present invention. Without departing from the concept of the present invention, all other implementation methods that ordinary technicians in the field can think of without creative work, and other simple replacements and various changes to the technical solutions of the present invention, all belong to the protection scope of the present invention.

Claims

1. A coke dry quenching circulating gas supply and waste heat utilization system, characterized in that: It comprises a circulating air supply mechanism (1) and a waste heat utilization mechanism (2), wherein: The circulating air supply mechanism (1) comprises a circulating air outlet pipe (11) connected to the upper side wall of the dry quenching furnace and a circulating air inlet pipe (12) connected to the lower side wall of the dry quenching furnace, the circulating air outlet pipe (11) is connected to a primary dust collector (13), the circulating air inlet pipe (12) is provided with a secondary dust collector (14) and a circulating fan (15), and the air inlet of the secondary dust collector (14) is connected to a circulating air pipeline (16); The waste heat utilization mechanism (2) comprises a dry quenching boiler (21), a heat pipe heat exchanger (22) and a deaerator (23); the dry quenching boiler (21) is connected to the gas outlet end of the circulating gas outlet pipe (11); the gas outlet end of the dry quenching boiler (21) is in communication with the circulating gas pipeline (16); the heat pipe heat exchanger (22) is connected to the gas outlet end of the circulating fan (15); the water inlet of the heat pipe heat exchanger (22) is connected to a desalinated cold water pipe (24); the water outlet of the heat pipe heat exchanger (22) is connected to the deaerator (23) via a desalinated hot water pipe (25); and the deaerator (23) is connected to the water inlet of the dry quenching boiler (21) via a boiler feed water pipe (26).

2. The CDQ circulating gas supply and waste heat utilization system according to claim 1, characterized in that: The steam outlet of the dry coke quenching boiler (21) is connected to the steam inlet of the deaerator (23) through a steam pipe (27).

3. The CDQ circulating gas supply and waste heat utilization system according to claim 1, characterized in that: The primary dust collector (13) and the secondary dust collector (14) are both connected to the coke powder storage tank (17).

4. The CDQ circulating gas supply and waste heat utilization system according to claim 1, characterized in that: The circulating air supply mechanism (1) is connected to an air supply pipe (18) on the upper side wall of the dry quenching furnace.

5. The CDQ circulating gas supply and waste heat utilization system according to claim 1, characterized in that: The heat pipe heat exchanger (22) is connected to an air intake bypass pipe (28) and a pressure regulating exhaust pipe (29), and the air intake bypass pipe (28) is connected to the upper part of the dry quenching furnace.

6. The CDQ circulating gas supply and waste heat utilization system according to claim 1, characterized in that: It also comprises a dust removal mechanism (3), wherein the dust removal mechanism (3) comprises a dust collecting hood (31), and the dry quenching furnace, a loading device arranged at the top of the dry quenching furnace, and a discharging device arranged at the bottom thereof are respectively connected to the dust collecting hood (31) via dust collecting pipes (32).

7. The CDQ circulating gas supply and waste heat utilization system according to claim 6, characterized in that: The discharging device is connected to a desulfurization pipeline (33).

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