阅读说明：本技术 一种烟气余热利用系统 (Flue gas waste heat utilization system ) 是由 管亿 孙建涛 田忠权 王伟星 王新 于 2019-12-06 设计创作，主要内容包括：本发明提供了一种烟气余热利用系统,该系统可以同时让两种不同余热烟气分别加热两种参数的过热蒸汽,能够满足多元化的生产需求。其包括烟气通道和汽包,高温烟气自烟气进口进入烟气通道,依次冲刷过热器、蒸发器、省煤器后从烟气出口排出；省煤器的出水口与汽包通过管道连接,汽包通过下降管、上升管与蒸发器连接形成循环回路,汽包通过上部蒸汽管道与过热器连接。其还包括烟气混合室,烟气混合室的输出端连接蒸发器,位于烟气混合室的输入端的烟气通道分隔为第一烟气通道、第二烟气通道,第一烟气通道、第二烟气通道内分别设置有第一过热器、第二过热器；汽包通过上部蒸汽管道分别与第一过热器、第二过热器连接。(The invention provides a flue gas waste heat utilization system, which can simultaneously enable two kinds of different waste heat flue gas to respectively heat superheated steam with two parameters, and can meet diversified production requirements. The high-temperature flue gas enters the flue gas channel from a flue gas inlet, sequentially scours a superheater, an evaporator and an economizer and then is discharged from a flue gas outlet; the water outlet of the economizer is connected with a steam pocket through a pipeline, the steam pocket is connected with the evaporator through a down pipe and an up pipe to form a circulation loop, and the steam pocket is connected with the superheater through an upper steam pipeline. The device also comprises a flue gas mixing chamber, wherein the output end of the flue gas mixing chamber is connected with an evaporator, a flue gas channel positioned at the input end of the flue gas mixing chamber is divided into a first flue gas channel and a second flue gas channel, and a first superheater and a second superheater are respectively arranged in the first flue gas channel and the second flue gas channel; the steam pocket is respectively connected with the first superheater and the second superheater through an upper steam pipeline.)

1. A flue gas waste heat utilization system comprises a flue gas channel and a steam pocket, wherein a superheater, an evaporator and an economizer are sequentially arranged in the flue gas channel along the flow direction of flue gas, high-temperature flue gas enters the flue gas channel from a flue gas inlet, and is sequentially flushed away from the superheater, the evaporator and the economizer and then discharged from a flue gas outlet; the water outlet of the economizer is connected with the steam pocket through a pipeline, the steam pocket is connected with the evaporator through a downcomer and an ascending pipe to form a circulation loop, and the steam pocket is connected with the superheater through an upper steam pipeline; the method is characterized in that: the flue gas mixing device also comprises a flue gas mixing chamber, wherein the output end of the flue gas mixing chamber is connected with the evaporator, the flue gas channel positioned at the input end of the flue gas mixing chamber is divided into a first flue gas channel and a second flue gas channel, and a first superheater and a second superheater are respectively arranged in the first flue gas channel and the second flue gas channel; the steam drum is respectively connected with the first superheater and the second superheater through the upper steam pipeline.

2. The flue gas waste heat utilization system of claim 1, characterized in that: the first flue gas channel and the second flue gas channel are water-cooled walls.

3. The flue gas waste heat utilization system of claim 1, characterized in that: the evaporator is a high-temperature evaporator and a low-temperature evaporator in sequence along the flowing direction of the flue gas.

4. The flue gas waste heat utilization system of claim 1, characterized in that: the coal economizer is a high-temperature coal economizer and a low-temperature coal economizer in sequence along the flowing direction of the flue gas.

Technical Field

The invention relates to the technical field of waste heat utilization systems, in particular to a flue gas waste heat utilization system.

Background

Large petrochemical and chemical enterprises usually have a plurality of parallel and concurrent product production lines, and parameters such as temperature, pressure and the like of superheated steam required in the production of each target product are different; meanwhile, parameters such as the amount of flue gas discharged by the energy tail gas of each product production line, the temperature and the like are also different. However, the existing flue gas waste heat utilization system can only treat flue gas for one product production line and provide superheated steam with one parameter.

Disclosure of Invention

The invention provides a flue gas waste heat utilization system, aiming at the defects that the existing flue gas waste heat utilization system can only process flue gas generated by a product production line and provide superheated steam with one parameter.

The invention provides the following technical scheme:

a flue gas waste heat utilization system comprises a flue gas channel and a steam pocket, wherein a superheater, an evaporator and an economizer are sequentially arranged in the flue gas channel along the flow direction of flue gas, high-temperature flue gas enters the flue gas channel from a flue gas inlet, and is sequentially flushed away from the superheater, the evaporator and the economizer and then discharged from a flue gas outlet; the water outlet of the economizer is connected with the steam pocket through a pipeline, the steam pocket is connected with the evaporator through a downcomer and an ascending pipe to form a circulation loop, and the steam pocket is connected with the superheater through an upper steam pipeline; the method is characterized in that: the flue gas mixing device also comprises a flue gas mixing chamber, wherein the output end of the flue gas mixing chamber is connected with the evaporator, the flue gas channel positioned at the input end of the flue gas mixing chamber is divided into a first flue gas channel and a second flue gas channel, and a first superheater and a second superheater are respectively arranged in the first flue gas channel and the second flue gas channel; the steam drum is respectively connected with the first superheater and the second superheater through the upper steam pipeline.

It is further characterized in that:

the first flue gas channel and the second flue gas channel are water-cooled walls;

the evaporator is a high-temperature evaporator and a low-temperature evaporator in sequence along the flowing direction of the flue gas;

the coal economizer comprises a high-temperature coal economizer and a low-temperature coal economizer in sequence along the flowing direction of flue gas;

compared with the prior art, the invention has the following beneficial effects:

the flue gas channel of the input section is divided into two parts, and the first superheater and the second superheater are respectively arranged in the first flue gas channel and the second flue gas channel, so that two different kinds of waste heat flue gas can be treated at the same time, the two different kinds of waste heat flue gas can be used for respectively heating superheated steam with two parameters at the same time, and diversified production requirements can be met;

the first flue gas channel and the second flue gas channel are water-cooled walls, so that high-temperature flue gas is further cooled, and diversified production requirements are further met.

Drawings

FIG. 1 is an overall schematic view of the present invention;

in the figure: 1, a flue gas channel; 11 a first flue gas channel; 12 a second flue gas channel; 2, a flue gas inlet; 3, a superheater; 31 a first superheater; 32 a second superheater; 4 a flue gas mixing chamber; 5, an evaporator; 51 high temperature evaporator; a 52 low temperature evaporator; 6, a coal economizer; 61 high-temperature coal economizer; 62 low-temperature coal economizer; 7, a flue gas outlet; 8, a steam drum; 81 a down pipe; 82 a riser pipe; 83 upper steam line.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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.

Referring to fig. 1, a flue gas waste heat utilization system comprises a flue gas channel 1 and a steam drum 8, wherein a superheater 3, an evaporator 5 and an economizer 6 are sequentially arranged in the flue gas channel 1 along the flow direction of flue gas, high-temperature flue gas enters the flue gas channel 1 from a flue gas inlet 2, sequentially washes the superheater 3, the evaporator 5 and the economizer 6 and then is discharged from a flue gas outlet 7; the water outlet of the economizer 6 is connected with the steam drum 8 through a pipeline, the steam drum 8 is connected with the evaporator 5 through a downcomer 81 and an upcomer 82 to form a circulation loop, and the steam drum 8 is connected with the superheater 3 through an upper steam pipeline 83. The flue gas mixing device further comprises a flue gas mixing chamber 4, the output end of the flue gas mixing chamber 4 is connected with an evaporator 5, a flue gas channel 1 positioned at the input end of the flue gas mixing chamber 4 is divided into a first flue gas channel 11 and a second flue gas channel 12, and a first superheater 31 and a second superheater 32 are respectively arranged in the first flue gas channel 11 and the second flue gas channel 12; the steam drum 8 is connected to the first superheater 31 and the second superheater 32 via an upper steam line 83, respectively. According to the invention, the flue gas channel 1 of the input section is divided into two parts, the first superheater 31 and the second superheater 32 are respectively arranged in the first flue gas channel 11 and the second flue gas channel 12, two different kinds of waste heat flue gas can be simultaneously treated, two different kinds of waste heat flue gas can be simultaneously and respectively heated to overheat steam with two parameters, and diversified production requirements can be met.

The first flue gas channel and the second flue gas channel 12 are water-cooled walls, so that high-temperature flue gas is further cooled, and diversified production requirements are further met. The evaporator 5 is a high-temperature evaporator 51 and a low-temperature evaporator 52 in sequence along the flow direction of flue gas, and the economizer 6 is a high-temperature economizer 61 and a low-temperature economizer 62 in sequence along the flow direction of flue gas.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.