Gas blowback device for blast furnace gas system

Abstract

The utility model provides a coal gas blowback device for a blast furnace coal gas system, which comprises a high-pressure injection gas bag which is respectively connected with a high-pressure clean coal gas pipeline and an injection pipeline. When the device is applied to ash removal of a special box body for blast furnace pressure-equalizing gas recovery, nitrogen is changed into high-pressure blast furnace gas, so that the number of equipment is reduced, the operating cost is reduced, and heat value fluctuation of recovered gas caused by nitrogen is reduced; when the device is applied to ash removal of the coal gas ash conveying bin of the blast furnace coal gas dust remover, the number of devices can be reduced, the operation cost can be reduced, all the blast furnace coal gas is recycled, and CO inclusion and dissipation caused by original nitrogen back flushing are also reduced.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace pressure equalization gas recovery and blast furnace gas ash conveying, and in particular to a gas backflushing device for blast furnace gas systems. Background Technology

[0002] In the operation of the blast furnace pressure equalization gas recovery system, nitrogen is usually used to clean the ash from the special box for blast furnace pressure equalization gas recovery. The use of nitrogen increases the amount of nitrogen in the gas recovery system and makes the calorific value fluctuate; the use of nitrogen also increases the cost.

[0003] Similarly, in the blast furnace gas system, when the gas dust collector uses blast furnace gas to transport ash to the centralized ash silo, nitrogen is also used to clean the centralized ash silo, which also presents the same problem.

[0004] Therefore, there is an urgent need for a gas backflushing device for blast furnace gas systems that can solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a gas backflushing device for a blast furnace gas system to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a gas backflushing device for a blast furnace gas system, including a high-pressure injection gas manifold, which is connected to a high-pressure clean gas pipeline and an injection pipeline.

[0008] Preferably, the high-pressure clean gas pipeline is equipped with a first manual high-pressure stainless steel ball valve and connected to an external high-pressure clean gas source.

[0009] Preferably, the injection pipeline is equipped with a pneumatic high-pressure stainless steel ball valve and a second manual high-pressure stainless steel ball valve, and is externally connected to a special box for blast furnace pressure equalization gas recovery or a gas ash conveying silo for blast furnace gas dust collector.

[0010] Preferably, it also includes a sewage discharge pipeline, which is connected to the high-pressure jetting air manifold and externally connected to a low-pressure pipeline network.

[0011] The present invention achieves the following beneficial technical effects compared to the prior art:

[0012] This utility model provides a gas backflushing device for a blast furnace gas system, including a high-pressure injection gas manifold, which is connected to a high-pressure clean gas pipeline and an injection pipeline. When applied to the ash removal of the blast furnace pressure equalization gas recovery special box, nitrogen is replaced with high-pressure blast furnace gas, reducing the number of equipment, lowering operating costs, and reducing the calorific value fluctuation of the recovered gas caused by nitrogen. When applied to the ash removal of the blast furnace gas dust collector's gas conveying silo, the number of equipment can be reduced, operating costs can be lowered, and all blast furnace gas can be recovered, which also reduces the CO entrainment and emission caused by the original nitrogen backflushing. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This utility model provides a schematic diagram of a gas backflushing device for a blast furnace gas system. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] The purpose of this invention is to provide a gas backflushing device for blast furnace gas systems to solve the problems existing in the prior art.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1:

[0019] This embodiment provides a gas backflushing device for a blast furnace gas system, such as... Figure 1 As shown, it includes a high-pressure injection gas manifold 1, which is connected to a high-pressure clean coal gas pipeline 2 and an injection pipeline 3.

[0020] As one implementation method, a first manual high-pressure stainless steel ball valve 4 is provided on the high-pressure clean gas pipeline 2, and an external high-pressure clean gas source is connected to provide a blow-off gas source.

[0021] As one implementation method, the injection pipeline 3 is equipped with a pneumatic high-pressure stainless steel ball valve 5 and a second manual high-pressure stainless steel ball valve 6, and is externally connected to a special box for blast furnace pressure equalization gas recovery.

[0022] In the operation of blast furnace pressure equalization gas recovery systems, nitrogen is typically used for cleaning the dedicated blast furnace pressure equalization gas recovery chamber. The use of nitrogen increases the amount of nitrogen in the gas recovery system and is prone to fluctuations in calorific value; the use of nitrogen also increases costs. This embodiment uses blast furnace gas as the cleaning gas source, and the cleaning process is changed from nitrogen to blast furnace gas. This reduces the impact of nitrogen on calorific value fluctuations during gas recovery, and the operating environment of the chamber is adjusted to be completely suitable for the use of blast furnace gas, which can be used directly, reducing operating costs and the number of equipment.

[0023] As one implementation, it also includes a sewage discharge pipe 7, which is connected to the high-pressure jetting air manifold 1 and externally connected to a low-pressure pipeline network for sewage discharge.

[0024] Example 2:

[0025] In this embodiment, the gas backflushing device for the blast furnace gas system is the same as in Embodiment 1. The difference is that the high-pressure clean gas pipeline 2 is connected to the gas ash conveying silo of the blast furnace gas dust collector. In this embodiment, the cleaning of the centralized ash silo is changed from nitrogen to blast furnace gas. The cleaning parameters of the centralized ash silo must be adapted to the parameters of the blast furnace gas. In this way, the high-pressure blast furnace gas can be used directly without parameter adjustment, reducing the number of equipment and lowering the operating cost. Moreover, all the blast furnace gas is recovered, which also reduces the CO entrainment and emission caused by the original nitrogen backflushing.

[0026] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gas backflushing device for a blast furnace gas system, characterized in that: It includes a high-pressure injection gas manifold, which is connected to a high-pressure clean coal gas pipeline and an injection pipeline, respectively; The high-pressure clean coal gas pipeline is equipped with a first manual high-pressure stainless steel ball valve, which is connected to an external high-pressure clean coal gas source. The injection pipeline is equipped with a pneumatic high-pressure stainless steel ball valve and a second manual high-pressure stainless steel ball valve, and is externally connected to a special box for blast furnace pressure equalization gas recovery or a gas ash conveying silo for blast furnace gas dust collector. It also includes a sewage pipe, which is connected to the high-pressure jetting air manifold and externally connected to a low-pressure pipeline network.

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