阅读说明：本技术 一种焦炭塔放空气回收利用方法 (Recycling method of coke tower vent gas ) 是由 马宏基 张振伟 刘东良 王志保 于 2020-05-12 设计创作，主要内容包括：本发明属于焦化技术领域,公开了一种焦炭塔放空气回收利用方法,包括以下步骤：步骤一、焦炭塔反应完毕将放空气通入放空塔,放空塔将放空气进行气、液分离；步骤二、分离出的液体进入油液回收罐,分离出的气体进入水洗塔；步骤三、进入水洗塔的气体经水洗塔水洗后除去硫化氢及部分杂质；步骤四、水洗后的气体通入分馏塔中,除去气体中夹带的水滴后通入气体压缩机。本方案的焦炭塔放空气回收利用方法实现了对放空气进行回收再利用,焦炭塔放空气具有热值高、流量多等特点,且压力稳定,容易并入燃料气管网,放空气回收后,能够为燃料气管网提供足够的燃料气量,减少燃料气管网的对液化气的用量,起到节能降耗、提质增效的目的。(The invention belongs to the technical field of coking, and discloses a method for recycling vent gas of a coke tower, which comprises the following steps: step one, after the reaction of the coke tower is finished, introducing the vent gas into a vent tower, and carrying out gas-liquid separation on the vent gas by the vent tower; step two, the separated liquid enters an oil liquid recovery tank, and the separated gas enters a water washing tower; step three, washing the gas entering the water washing tower by the water washing tower to remove hydrogen sulfide and partial impurities; and step four, introducing the gas after washing into a fractionating tower, removing water drops carried in the gas, and introducing into a gas compressor. The recycling method for the coke tower vent gas realizes recycling of the vent gas, the coke tower vent gas has the characteristics of high heat value, high flow and the like, the pressure is stable, the coke tower vent gas is easy to merge into a fuel gas pipe network, and after the vent gas is recycled, enough fuel gas can be provided for the fuel gas pipe network, so that the consumption of the fuel gas pipe network on liquefied gas is reduced, and the purposes of saving energy, reducing consumption, improving quality and increasing efficiency are achieved.)

1. A coke drum vent gas recycling method is characterized by comprising the following steps: the method comprises the following steps:

step one, after the reaction of the coke tower is finished, introducing the vent gas into a vent tower, and carrying out gas-liquid separation on the vent gas by the vent tower;

step two, the separated liquid enters an oil liquid recovery tank, and the separated gas enters a water washing tower;

step three, washing the gas entering the water washing tower by the water washing tower to remove hydrogen sulfide and partial impurities;

step four, introducing the gas after washing into a fractionating tower, removing water drops carried in the gas, and introducing into a gas compressor;

and step five, after the pressure is increased by a gas compressor, the gas enters a fuel gas pipe network to provide fuel gas for production equipment.

2. The coke drum vent gas recycle method of claim 1, wherein: the first step is specifically as follows: and after the reaction of the coke tower is finished, introducing the vent gas into the vent tower, wherein the vent gas firstly passes through double-layer washing of heavy distillate oil at the bottom of the vent tower and then continues to ascend, the heavy oil at the bottom of the vent tower carries and traps coke powder particles, the heavy oil passes through a filter and then is vented to cool a sump oil pump at the bottom of the vent tower, one part of the heavy oil enters the middle part of the vent tower and is in reverse contact with oil gas, and then after the heavy oil and the sump oil are washed with two layers of light distillate oil at the top of the vent tower, the heavy oil and the sump oil are firstly cooled by an air cooler and then enter a separation tank for gas and liquid separation.

3. The coke drum vent gas recycle method of claim 1, wherein: the temperature of the top of the emptying tower is 100-150 ℃, and the temperature of the bottom of the emptying tower is 130-200 ℃.

4. The coke drum vent gas recycle method of claim 1, wherein: the vent gas flow into the vent tower was 46500kg/h, the pressure was 0.10MPa (G), the density was 1.09kg/cum, the average molecular weight was 29.8, and the viscosity was 0.023 cP.

5. The coke drum vent gas recycle method of claim 1, wherein: the pressure of the fractionating tower is not higher than 0.09MPa, and the temperature is not higher than 112-114 ℃.

Technical Field

The invention relates to the technical field of coking, in particular to a recycling method of coke tower vent gas.

Background

The delayed coking is a main inferior heavy oil processing means of an oil refinery, as a process of continuous production and discontinuous operation, generally at least two coke drums are provided, when one coke drum is in on-line coking, the other coke drum carries out the related operation of decoking, the two coke drums alternately carry out the coking and decoking operations, and the coke drum for decoking needs to be subjected to the steps of small steam blowing, large steam blowing, small water supply, large water supply, coke foaming, water discharging, top opening coke drilling, bottom opening coke discharging, hydraulic coke cutting, steam driving, steam pressure testing, steam discharging and dehydration, oil gas preheating and the like.

In the coke cooling process, high-temperature coke heats coke cooling water, a large amount of steam is generated and discharged into the atmosphere (commonly called as vent gas), and the gas contains acidic components such as H2S, so that the environment pollution is caused after the gas is directly discharged after combustion, and the atmosphere is damaged.

Disclosure of Invention

Technical problem to be solved

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a recycling method of coke tower vent gas, which solves the problems that the gas contains acidic components such as H2S and the like, and the environment is polluted and the atmosphere is damaged after the gas is directly discharged after combustion.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme:

a coke drum vent gas recycling method is characterized by comprising the following steps: the method comprises the following steps:

step one, after the reaction of the coke tower is finished, introducing the vent gas into a vent tower, and carrying out gas-liquid separation on the vent gas by the vent tower;

step two, the separated liquid enters an oil liquid recovery tank, and the separated gas enters a water washing tower;

step three, washing the gas entering the water washing tower by the water washing tower to remove hydrogen sulfide and partial impurities;

step four, introducing the gas after washing into a fractionating tower, removing water drops carried in the gas, and introducing into a gas compressor;

and step five, after the pressure is increased by a gas compressor, the gas enters a fuel gas pipe network to provide fuel gas for production equipment.

Preferably, the first step is specifically: and after the reaction of the coke tower is finished, introducing the vent gas into the vent tower, wherein the vent gas firstly passes through double-layer washing of heavy distillate oil at the bottom of the vent tower and then continues to ascend, the heavy oil at the bottom of the vent tower carries and traps coke powder particles, the heavy oil passes through a filter and then is vented to cool a sump oil pump at the bottom of the vent tower, one part of the heavy oil enters the middle part of the vent tower and is in reverse contact with oil gas, and then after the heavy oil and the sump oil are washed with two layers of light distillate oil at the top of the vent tower, the heavy oil and the sump oil are firstly cooled by an air cooler and then enter a separation tank for gas and liquid separation.

Preferably, the temperature of the top of the emptying tower is 100-150 ℃, and the temperature of the bottom of the emptying tower is 130-200 ℃.

Preferably, the vent gas flow into the vent tower is 46500kg/h, the pressure is 0.10MPa (G), the density is 1.09kg/cum, the average molecular weight is 29.8, and the viscosity is 0.023 cP.

Preferably, the pressure of the fractionating tower is not higher than 0.09MPa, and the temperature is not higher than 112-114 ℃.

(III) advantageous effects

Compared with the prior art, the invention provides a method for recycling the coke tower vent gas, which has the following beneficial effects:

(1) the recycling method for the coke tower vent gas realizes recycling of the vent gas, the coke tower vent gas has the characteristics of high heat value, high flow and the like, the pressure is stable, the coke tower vent gas is easy to merge into a fuel gas pipe network, and after the vent gas is recycled, enough fuel gas can be provided for the fuel gas pipe network, so that the consumption of the fuel gas pipe network on liquefied gas is reduced, and the purposes of saving energy, reducing consumption, improving quality and increasing efficiency are achieved.

(2) The method for recycling the coke tower vent gas solves the problem of environmental pollution, achieves the purposes of energy conservation and consumption reduction, ensures that no waste is discharged, achieves the national standard, and has the advantages of simple operation, small investment and large return.

(3) Meanwhile, the gas compressor is arranged, so that the gas density is increased, the conveying speed is increased, and the combustion efficiency is ensured.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

a coke drum vent gas recycling method is characterized by comprising the following steps: the method comprises the following steps:

step one, after the reaction of the coke tower is finished, introducing the vent gas into a vent tower, and carrying out gas-liquid separation on the vent gas by the vent tower;

step two, the separated liquid enters an oil liquid recovery tank, and the separated gas enters a water washing tower;

step three, washing the gas entering the water washing tower by the water washing tower to remove hydrogen sulfide and partial impurities;

step four, introducing the gas after washing into a fractionating tower, removing water drops carried in the gas, and introducing into a gas compressor;

and step five, after the pressure is increased by a gas compressor, the gas enters a fuel gas pipe network to provide fuel gas for production equipment.

Further, the first step specifically comprises: and after the reaction of the coke tower is finished, introducing the vent gas into the vent tower, wherein the vent gas firstly passes through double-layer washing of heavy distillate oil at the bottom of the vent tower and then continues to ascend, the heavy oil at the bottom of the vent tower carries and traps coke powder particles, the heavy oil passes through a filter and then is vented to cool a sump oil pump at the bottom of the vent tower, one part of the heavy oil enters the middle part of the vent tower and is in reverse contact with oil gas, and then after the heavy oil and the sump oil are washed with two layers of light distillate oil at the top of the vent tower, the heavy oil and the sump oil are firstly cooled by an air cooler and then enter a separation tank for gas and liquid separation.

Further, the temperature of the top of the vent tower is 100 ℃, and the temperature of the bottom of the vent tower is 130 ℃.

Further, the flow rate of vent gas to the vent tower was 46500kg/h, the pressure was 0.10MPa (G), the density was 1.09kg/cum, the average molecular weight was 29.8, and the viscosity was 0.023 cP.

Further, the pressure of the fractionating tower is not higher than 0.09MPa, and the temperature is not higher than 112 ℃.

Example two:

a coke drum vent gas recycling method is characterized by comprising the following steps: the method comprises the following steps:

step one, after the reaction of the coke tower is finished, introducing the vent gas into a vent tower, and carrying out gas-liquid separation on the vent gas by the vent tower;

step two, the separated liquid enters an oil liquid recovery tank, and the separated gas enters a water washing tower;

step three, washing the gas entering the water washing tower by the water washing tower to remove hydrogen sulfide and partial impurities;

step four, introducing the gas after washing into a fractionating tower, removing water drops carried in the gas, and introducing into a gas compressor;

and step five, after the pressure is increased by a gas compressor, the gas enters a fuel gas pipe network to provide fuel gas for production equipment.

Further, the first step specifically comprises: and after the reaction of the coke tower is finished, introducing the vent gas into the vent tower, wherein the vent gas firstly passes through double-layer washing of heavy distillate oil at the bottom of the vent tower and then continues to ascend, the heavy oil at the bottom of the vent tower carries and traps coke powder particles, the heavy oil passes through a filter and then is vented to cool a sump oil pump at the bottom of the vent tower, one part of the heavy oil enters the middle part of the vent tower and is in reverse contact with oil gas, and then after the heavy oil and the sump oil are washed with two layers of light distillate oil at the top of the vent tower, the heavy oil and the sump oil are firstly cooled by an air cooler and then enter a separation tank for gas and liquid separation.

Further, the temperature of the top of the vent tower was 125 ℃ and the temperature of the bottom of the vent tower was 165 ℃.

Further, the flow rate of vent gas to the vent tower was 46500kg/h, the pressure was 0.10MPa (G), the density was 1.09kg/cum, the average molecular weight was 29.8, and the viscosity was 0.023 cP.

Further, the pressure of the fractionating tower is not higher than 0.09MPa, and the temperature is not higher than 113 ℃.

Example three:

a coke drum vent gas recycling method is characterized by comprising the following steps: the method comprises the following steps:

step one, after the reaction of the coke tower is finished, introducing the vent gas into a vent tower, and carrying out gas-liquid separation on the vent gas by the vent tower;

step two, the separated liquid enters an oil liquid recovery tank, and the separated gas enters a water washing tower;

step three, washing the gas entering the water washing tower by the water washing tower to remove hydrogen sulfide and partial impurities;

step four, introducing the gas after washing into a fractionating tower, removing water drops carried in the gas, and introducing into a gas compressor;

and step five, after the pressure is increased by a gas compressor, the gas enters a fuel gas pipe network to provide fuel gas for production equipment.

Further, the first step specifically comprises: and after the reaction of the coke tower is finished, introducing the vent gas into the vent tower, wherein the vent gas firstly passes through double-layer washing of heavy distillate oil at the bottom of the vent tower and then continues to ascend, the heavy oil at the bottom of the vent tower carries and traps coke powder particles, the heavy oil passes through a filter and then is vented to cool a sump oil pump at the bottom of the vent tower, one part of the heavy oil enters the middle part of the vent tower and is in reverse contact with oil gas, and then after the heavy oil and the sump oil are washed with two layers of light distillate oil at the top of the vent tower, the heavy oil and the sump oil are firstly cooled by an air cooler and then enter a separation tank for gas and liquid separation.

Further, the temperature of the top of the vent tower is 150 ℃, and the temperature of the bottom of the vent tower is 200 ℃.

Further, the flow rate of vent gas to the vent tower was 46500kg/h, the pressure was 0.10MPa (G), the density was 1.09kg/cum, the average molecular weight was 29.8, and the viscosity was 0.023 cP.

Further, the pressure of the fractionating tower is not higher than 0.09MPa, and the temperature is not higher than 114 ℃.

In summary, the following steps: the recycling method for the coke tower vent gas realizes recycling of the vent gas, the coke tower vent gas has the characteristics of high heat value, high flow and the like, the pressure is stable, the coke tower vent gas is easy to merge into a fuel gas pipe network, after the vent gas is recycled, enough fuel gas can be provided for the fuel gas pipe network, the consumption of the fuel gas pipe network to liquefied gas is reduced, the purposes of energy conservation, consumption reduction, quality improvement and efficiency improvement are achieved, meanwhile, the problem of environmental pollution is solved, the purposes of energy conservation, consumption reduction and waste emission are achieved, the national standard is guaranteed to be not discharged, the operation is simple, the investment is small, and the return is large.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.