RU2798319C1 - Dust removal device for dry coke quenching and method for increasing steam output of dry coke quenching boiler - Google Patents

Abstract

FIELD: dry quenching of coke.

SUBSTANCE: dust removing device for dry coke quenching contains a dust remover, a coke powder hopper, a combustion chamber and an ash release valve. The coke powder outlet is located at the bottom of the dust extractor, and the coke powder outlet is connected to the coke powder inlet on the top of the coke powder bin. The coke powder outlet at the bottom of the coke powder hopper is connected to the coke powder inlet at the top of the combustion chamber. The oxidizing air inlet and combustion chamber nozzle are located on one side of the combustion chamber, and the hot flue gas outlet is located on the other side of the combustion chamber. The hot flue gas outlet is connected to the dust extractor via a hot flue gas pipe. An ash discharge valve is provided in the ash discharge port at the bottom of the combustion chamber. A method for increasing the steam output of a dry coke quenching boiler is also disclosed.

EFFECT: ensuring complete combustion of the coke powder and extracting additional heat for the circulating gas of the dry coke quenching boiler.

7 cl, 1 dwg

Description

[0001] The present application claims the priority of Chinese Patent Application No. 201911059317.1 entitled "DUST REMOVAL EQUIPMENT FOR DRY COKE EXTINGUISHING AND METHOD FOR INCREASING STEAM OUTPUT OF DRY COKE EXTINGUISHING BOILER", registered by the China National Intellectual Property Office on November 1, 2019 which is incorporated here by reference in in all its fullness.

FIELD OF TECHNOLOGY

[0002] The present application relates to the field of dry quenching of coke and, in particular, to a dust removing device for dry quenching of coke and a method for increasing the steam output of a dry quenching of coke boiler.

BACKGROUND OF THE INVENTION

[0003] During the dry coke quenching process, red coke is supplied from the top of the dry coke quenching boiler, and low temperature inert gas is blown into the red coke bed in the cooling zone of the dry quenching boiler by a circulation fan to absorb the heat content of the red coke, and the cooled coke is removed from the bottom boiler for dry coke quenching. The high temperature inert gas from the annular flue of the dry coke quenching boiler flows through the dry coke quenching boiler for heat exchange. The coke dry quenching boiler generates steam, and the cooled inert gas is again blown into the dry quenching boiler by means of a circulating fan, and the inert gas circulates in a closed system. Under normal circumstances, the high-temperature circulating gas enters the coke dry quenching boiler for heat exchange after passing through the primary dust extractor to separate the coarse coke powder particles. A low temperature circulating gas with a temperature dropped to approximately 160° C. exits the dry coke quenching boiler. After passing through the secondary deduster to separate fine particles of coke powder, the low-temperature circulating gas cooled to about 130°C is blown into the feed water preheater by the circulating fan and enters the dry coke quenching boiler for circulation.

[0004] The primary dust remover is configured to remove large particles of coke powder in the circulating gas and reduce erosion and abrasion of the boiler tubes caused by the circulating gas. At present, the coke powder collected by the primary dust remover is mainly used for sintering, coke powder coking and activated carbon coking based on settled ash, etc. However, due to the low quality of the separated coke powder, high energy consumption or technical limitations, the economic benefits achieved by this method are limited and it is prone to cause environmental pollution.

SUMMARY OF THE INVENTION

[0005] A dust removing device for dry coke quenching and a method for improving the steam output of a dry coke quenching boiler are provided according to the present invention. The combustion chamber located below the dust extractor is arranged to completely burn the coke powder deposited from the dust extractor, and a large amount of hot flue gas generated from the combustion chamber will be introduced into the circulating gas to allow the dry coke quenching boiler to produce more steam, obtaining, thus, greater economic benefit.

[0006] In order to achieve the above objects, the following technical solutions are adopted by the present invention.

[0007] A dust extractor for dry coke quenching, which includes a dust extractor, a coke powder hopper, a combustion chamber, and an ash discharge valve, which are connected in series from top to bottom. The circulating gas inlet is located on one side of the upper part of the dust extractor, and the circulating gas outlet is located on the other side of the upper part of the dust extractor. The circulating gas inlet is connected to the circulating gas outlet of the dry coke quenching boiler, and the circulating gas outlet is connected to the circulating gas inlet of the dry coke quenching boiler. The coke powder outlet is located on the bottom of the dust extractor and connects with the coke powder inlet on the top of the coke powder bin. The coke powder outlet at the bottom of the coke powder bin is connected to the coke powder inlet at the top of the combustion chamber, the oxidizing air inlet and combustion chamber nozzle are located on one side of the combustion chamber, and the hot flue gas outlet is located on the other side of the combustion chamber. The hot flue gas outlet is connected to the dust extractor through the hot flue gas pipe, and an ash discharge valve is provided at the ash discharge port on the bottom of the combustion chamber.

[0009] The coke powder outlet of the dust extractor is connected to the coke powder inlet of the coke powder hopper via the first flange.

[0010] The coke powder outlet of the coke powder bin is connected to the coke powder inlet of the combustion chamber via a second flange.

[0011] The ash outlet port of the combustion chamber is connected to the ash outlet valve via a third flange.

[0012] The heat insulating layer is located on the outside of the hot flue gas pipe.

[0013] A method for increasing the steam output of a dry coke quenching boiler, in which circulating gas flows from the dry quenching side to the dry coke quenching side through the dust extractor. In the dust extractor, most of the coke powder in the circulating gas settles due to gravity. The precipitated coke powder falls into the coke powder hopper below; The coke powder collected by the coke powder hopper enters the combustion chamber and is completely burned in the combustion chamber, and the hot flue gas obtained by combustion is introduced into the dust extractor through the coke dust hopper or introduced into the dust extractor through the hot flue gas pipe outside the combustion chamber. The hot flue gas provides a lot of heat to the circulating gas to allow the subsequent dry coke boiler to produce more steam. The ash discharge valve under the combustion chamber is arranged to regulate the ash discharge rate, and a sealing effect is obtained from the ash to prevent air from entering.

[0014] Compared with the conventional art, the advantageous effects of the present invention are as follows.

1) The coke powder deposited and discharged from the dust extractor can be completely burned, and a large amount of hot flue gas generated by combustion can be introduced into the circulating gas, so that the coke dry quenching boiler can produce more steam. The process path is short and the heat recovery efficiency is high, providing great economic benefits;

2) The loading of subsequently processed coke powder is reduced, and the leakage of coke powder is reduced, which is economical and environmentally friendly.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of a dust removing device for dry coke quenching provided by the present invention.

[0016] Numerical designations in figure 1:

dust extractor 1, coke powder hopper 2, combustion chamber 3, ash discharge valve 4.

DETAILED DESCRIPTION OF EMBODIMENTS

[0017] Embodiments will be described in detail below in conjunction with the drawings.

[0018] As shown in Figure 1, the dust removing apparatus for dry coke quenching provided according to the present invention includes a dust extractor 1, a coke powder hopper 2, a combustion chamber 3, and an ash discharge valve 4, which are connected in series from top to bottom. The circulating gas inlet is located on one side of the top of the dust extractor 1, and the circulating gas outlet is located on the other side of the top of the dust extractor 1. The circulating gas inlet is connected to the circulating gas outlet of the dry coke quenching boiler, and the circulating gas outlet is connected to the circulating gas inlet of the dry quenching boiler coke. The coke powder outlet is located on the bottom of the dust extractor 1 and is connected to the coke powder inlet on the top of the coke powder hopper 2. The coke powder outlet at the bottom of the coke powder hopper 2 is connected to the coke powder inlet at the top of the combustion chamber 3, the oxidizing air inlet and the combustion chamber nozzle are located on one side of the combustion chamber 3, and the hot flue gas outlet is located on the other side of the combustion chamber 3. The hot flue gas outlet is connected to the dust extractor 1 via a hot flue gas pipe, and an ash discharge valve 4 is provided at the ash discharge port on the bottom of the combustion chamber 3.

[0019] The dust extractor 1 is a gravity settling type dust extractor.

[0020] The coke powder outlet of the dust extractor 1 is connected to the coke powder inlet of the coke powder bin 2 by a first flange.

[0021] The coke powder outlet of the coke powder bin 2 is connected to the coke powder inlet of the combustion chamber 3 by a second flange.

[0022] The ash outlet port of the combustion chamber 3 is connected to the ash outlet valve 4 by a third flange.

[0023] The thermal insulating layer is located on the outside of the hot flue gas pipe.

[0024] According to the present invention, there is provided a method for increasing the steam output of a dry coke quenching boiler in which circulating gas flows from the dry quenching side to the dry coke quenching side through the dust extractor 1. In the dust extractor 1, most of the coke powder in the circulating gas settles due to gravity. The precipitated coke powder falls into the coke powder hopper 2 below. The coke powder collected in the coke powder hopper 2 enters the combustion chamber 3, oxidizing air is injected into the combustion chamber 3, and the hot coke powder is completely burned after the nozzle of the combustion chamber 3. The hot flue gas obtained in the combustion chamber is introduced into the dust extractor 1 through the coke dust hopper 2 or is introduced into the dust extractor 1 through the hot flue gas pipe outside the combustion chamber 3. The pressure balance is optimized by introducing hot flue gas through the hot flue gas pipe. The hot flue gas provides a lot of heat to the circulating gas, allowing the subsequent dry-coke boiler to produce more steam. The ash discharge valve 4 below the combustion chamber 3 is arranged to regulate the ash discharge rate, and a sealing effect is generated from the ash to prevent air from entering.

[0025] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Equivalent substitutions or modifications according to these technical solutions and the invented concept of the present invention made by any person skilled in the art within the technical scope disclosed by the present invention are covered by the protection scope of the present invention.

Claims (7)

1. A dust removing device for dry coke quenching, comprising a dust remover, a coke powder hopper, a combustion chamber and an ash discharge valve connected in series from top to bottom, with the circulating gas inlet located on one side of the upper part of the dust extractor, and the circulating gas outlet located on the other side of the upper part dust extractor; the circulating gas inlet is connected to the circulating gas outlet of the dry coke quenching boiler, and the circulating gas outlet is connected to the circulating gas inlet of the dry coke quenching boiler; the coke powder outlet is located at the bottom of the dust extractor, and the coke powder outlet is connected to the coke powder inlet at the top of the coke powder hopper; the coke powder outlet at the bottom of the coke powder bin is connected to the coke powder inlet at the top of the combustion chamber, the oxidizing air inlet and the combustion chamber nozzle are located on one side of the combustion chamber, and the hot flue gas outlet is located on the other side of the combustion chamber and the hot combustion chamber outlet gas is connected to the dust extractor through a pipe of hot flue gas; an ash discharge valve is provided at the ash discharge port at the bottom of the combustion chamber. 2. The dust removing apparatus for dry coke quenching according to claim 1, wherein the dust extractor is a gravity settling type dust extractor. 3. The dust removing device for dry coke quenching according to claim 1, wherein the coke powder outlet of the dust remover is connected to the coke powder inlet of the coke powder hopper through a first flange. 4. The dust removing device for dry coke quenching according to claim 1, wherein the coke powder outlet of the coke powder bin is connected to the coke powder inlet of the combustion chamber via a second flange. 5. The dust removing device for dry coke quenching according to claim 1, wherein the ash discharge port of the combustion chamber is connected to the ash discharge valve via a third flange. 6. Dust removing device for dry coke quenching according to claim 1, in which the thermally insulating layer is located on the outside of the hot flue gas pipe. 7. A method for increasing the steam output of a dry coke quenching boiler, based on a dust removal device for dry coke quenching according to any one of paragraphs. 1-6, in which the circulating gas flows from the dry quenching side to the dry coke quenching side through the dust extractor; most of the coke powder in the circulating gas settles in the dust extractor due to gravity; the precipitated coke powder falls into the coke powder hopper below the dust extractor; the coke powder collected by the coke powder hopper enters the combustion chamber and is completely combusted in the combustion chamber, and the hot flue gas obtained by combustion is introduced into the dust extractor through the coke dust bin or introduced into the dust extractor through the hot flue gas pipe outside the combustion chamber; the hot flue gas provides heat to the circulating gas to allow the subsequent dry-coke boiler to produce additional steam; the ash discharge valve below the combustion chamber is configured to control the ash discharge rate, and the ash creates a sealing effect to prevent air from entering.

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