High-efficiency chamber bottom fireway structure of heat recovery coke oven

Abstract

The utility model discloses a high combustion efficiency chamber bottom fire channel structure of heat recovery coke oven, including carbonization chamber main wall, be located between two carbonization chamber main wall of adjacent carbonization chamber and set in the down fire channel and ascending fire channel of carbonization chamber main wall, down fire channel and ascending fire channel are alternately arranged in carbonization chamber main wall between each other interval, carbonization chamber bottom mounting has carbonization chamber bottom plate, and the lower space of carbonization chamber bottom plate is divided into chamber bottom fire channel cavity and chamber bottom air supply cavity through chamber bottom fire channel partition, chamber bottom fire channel partition is installed with furnace bottom air distributor, and chamber bottom air supply cavity is connected with chamber bottom fire channel cavity through furnace bottom air distributor. The upper space of carbonization chamber passes in proper order down fire channel entrance, down fire channel, down fire channel export and is connected with chamber bottom fire channel cavity, and this chamber bottom fire channel cavity is linked with ascending fire channel. Chamber bottom fire channel partition is installed with a plurality of furnace bottom air distributors. The utility model has the advantages of low chamber bottom fire channel resistance, uniform and efficient combustion.

Description

Technical Field

[0001] This utility model relates to a clean heat recovery coke oven, and more particularly to a bottom fire channel structure that can uniformly supply air to the bottom fire channel and has high combustion efficiency. Background Technology

[0002] Clean heat recovery coke ovens are production facilities that achieve coke-power cogeneration by recovering and transporting hot gas under negative pressure to waste heat boilers during coking production. During the coking process, the raw coal gas containing harmful and toxic gases is completely burned off at high temperatures, which not only greatly reduces the environmental pollution hazards of the coking process, but also makes full and comprehensive use of waste heat resources.

[0003] In a heat recovery coke oven, the combustible gas undergoes two combustion processes within the oven body: one at the top of the carbonization chamber and the other in the horizontal flues at the bottom of the vertical flues and the carbonization chamber. The heat generated from the combustion of these combustible raw gases provides the heat required for coal cake coking. Currently, most heat recovery coke ovens employ an S-shaped, multi-turn, series-connected horizontal flue structure at the bottom of the carbonization chamber. This series-connected structure significantly increases airflow length and resistance, causing a drop in waste gas temperature and resulting in uneven temperature distribution in the lower flues and at the oven bottom. Furthermore, the series-connected horizontal flues can only have secondary air inlets in certain sections, making it impossible to regulate the amount of secondary air in each section of the lower horizontal flue. This easily leads to uneven and incomplete combustion, resulting in poor temperature control in the lower flues of the heat recovery coke oven, uneven temperature at the bottom of the carbonization chamber, and ultimately uneven heating of the coal cake, leading to prolonged coking time and reduced thermal efficiency. On the other hand, multiple flue channels can easily lead to intense localized combustion and generate high-temperature zones. Under high-temperature conditions, nitrogen in the combustion air will react with oxidation to generate thermal nitrogen oxides, which are the main source of air pollution. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem solved by the present invention is to provide a high-efficiency combustion chamber bottom flue structure for a heat recovery coke oven with low resistance and uniform and efficient combustion.

[0005] To solve the above-mentioned technical problems, the present invention provides a high-efficiency combustion chamber bottom flue structure for a heat recovery coke oven, comprising a carbonization chamber main wall, a carbonization chamber located between two adjacent carbonization chamber main walls, and a descending flue and an ascending flue disposed within the carbonization chamber main wall, wherein the descending flue and the ascending flue are alternately disposed within the carbonization chamber main wall; a carbonization chamber bottom plate is installed at the bottom of the carbonization chamber, and the lower space of the carbonization chamber bottom plate is divided into a bottom flue cavity and a bottom air supply cavity by a bottom flue partition; a furnace bottom air distributor is installed on the bottom flue partition, and the bottom air supply cavity is connected to the bottom flue cavity through the furnace bottom air distributor.

[0006] Preferably, a plurality of descending fire channels and ascending fire channels are vertically arranged inside the main wall of the carbonization chamber, and the descending fire channels and ascending fire channels are arranged adjacent to each other at intervals.

[0007] Preferably, the upper space of the carbonization chamber passes sequentially through the descending fire channel inlet, the descending fire channel, and the descending fire channel outlet to the bottom fire channel cavity, which is connected to the ascending fire channel.

[0008] Preferably, a floor support column supports the floor between the fire channel partition and the carbonization chamber floor.

[0009] Preferably, the bottom flue baffle is supported on a flue baffle support column, and a number of bottom air distributors are installed on the bottom flue baffle.

[0010] Preferably, the furnace bottom air distributor body is provided with a downward-facing air distribution blind hole, and at least two air distribution holes are provided on the side wall of the furnace bottom air distributor, which are inclinedly connected to the air distribution blind hole.

[0011] Preferably, the angle α between the centerlines of the air distribution hole and the air distribution blind hole is 40°–50°.

[0012] Preferably, an air supply cavity rib wall is built along the width of the air supply cavity at the bottom of the chamber, which divides the air supply cavity at the bottom of the chamber into two chambers, each of which is connected to an air supply port.

[0013] In the above structure, since the descending fire channel and the ascending fire channel are arranged alternately and at intervals, that is, the descending fire channel and the ascending fire channel are arranged adjacent to each other in the main wall of the carbonization chamber, this helps to reduce the problem of uneven heating temperature between the descending fire channel and the ascending fire channel, so that the main wall of the carbonization chamber forms a more uniform heating effect on the carbonization chamber. Furthermore, because the bottom plate of the carbonization chamber and the bottom flue partition separate the bottom flue cavity and the bottom air supply cavity at the bottom of the carbonization chamber, and the bottom air supply cavity is connected to the bottom flue cavity through the bottom air distributor, this structure eliminates the traditional multi-turn multi-connection flue structure, directly forming an open combustion space, completely eliminating the traditional tortuous flue, greatly shortening the length of the bottom flue of the carbonization chamber, effectively reducing the resistance of the flue system, forming an efficient and uniform combustion space in the bottom flue cavity, and after the unburned raw coal gas input from the descending flue is fully mixed and burned with the air input from the bottom air distributor in the bottom flue cavity, it is directly output from the ascending flue. This not only helps to make the temperature field at the bottom of the furnace uniform and reduce the temperature difference at the bottom of the chamber, but also avoids the occurrence of local intense combustion, effectively avoiding the generation of nitrogen oxides in the flue gas and reducing the pollution of coke oven emissions to the environment. Furthermore, since the bottom air supply chamber supplies air to the bottom fire channel chamber through the bottom air distributor, on the one hand, the bottom air supply chamber can preheat and uniformly supply the external air, and the air supply volume and air flow rate can be easily controlled through the air supply port control valve; on the other hand, the air supply through the bottom air distributor can ensure the full mixing and combustion of air and combustible gas, thereby improving the coking quality and coking speed. Attached Figure Description

[0014] The structure of the bottom flue of the high-efficiency combustion chamber of the heat recovery coke oven of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of a specific embodiment of the bottom flue structure of the high-efficiency combustion chamber of the heat recovery coke oven of this utility model;

[0016] Figure 2 yes Figure 1 Schematic diagram of the structure along section A-A;

[0017] Figure 3 yes Figure 1 Schematic diagram of the structure of section B-B;

[0018] Figure 4 yes Figure 1 A schematic diagram of the cross-sectional structure of the air distributor at the bottom of the furnace.

[0019] In the diagram, 1—main wall of the carbonization chamber, 2—ascending flue, 3—carbonization chamber, 4—air distributor at the top of the furnace, 5—furnace top, 6—inlet of the descending flue, 7—descending flue, 8—outlet of the descending flue, 9—bottom plate of the carbonization chamber, 10—baffle plate of the bottom flue, 11—support column of the bottom plate, 12—support column of the flue baffle, 14—air distributor at the bottom of the furnace, 15—bottom flue cavity, 16—rib wall of the air supply cavity, 17—air supply port, 18—control valve of the air supply port, 19—blind hole for air distribution, 20—air distribution hole. Detailed Implementation

[0020] like Figure 1 Figure 2 and Figure 3 The high-efficiency combustion chamber bottom flue structure of the heat recovery coke oven shown includes two vertically parallel carbonization chamber main walls 1. A carbonization chamber 3 is located between the two carbonization chamber main walls 1. An arched furnace roof 5 is provided at the top of the two adjacent carbonization chamber main walls 1. A furnace roof air distributor 4 for supplying air to the carbonization chamber 3 is installed on the furnace roof 5. The furnace roof air distributor 4 adopts a common air distributor structure in heat recovery coke ovens. A descending flue 7 and an ascending flue 2 are alternately arranged on each carbonization chamber main wall 1, that is, one of two adjacent flues is a descending flue 7 and the other is an ascending flue 2; the descending flue 7 and the ascending flue 2 are located adjacently within the carbonization chamber main wall 1.

[0021] A carbonization chamber floor plate 9 is installed at the bottom of the carbonization chamber 3. The lower space of the carbonization chamber floor plate 9 is divided into a bottom flue chamber cavity 15 and a bottom air supply cavity 14 by a bottom flue partition 10. The bottom flue partition 10 is supported on the coke oven base by flue partition supports 12 made of refractory bricks. The carbonization chamber floor plate 9 is supported on the bottom flue partition 10 by bottom partition supports 11, which are also made of refractory bricks. The bottom flue chamber cavity 15 is the space between the carbonization chamber floor plate 9 and the bottom flue partition 10; the bottom air supply cavity 14 is the space between the bottom flue partition 10 and the coke oven base. The carbonization chamber floor plate 9 and the bottom flue partition 10 are formed and calcined from high-alumina refractory material.

[0022] The upper space of the carbonization chamber 3 is connected to the descending flue 7 through the descending flue inlet 6. The descending flue 7 is connected to one side of the bottom flue cavity 15 through the descending flue outlet 8. The other side of the bottom flue cavity 15 is connected to several corresponding ascending flues 2. The ascending flues 2 transport high-temperature flue gas to the waste heat power generation boiler for power generation through high-temperature flue gas riser pipe and conveying pipe.

[0023] An air supply cavity rib wall 16 is constructed along the width of the air supply cavity 14 at the bottom of the chamber. This rib wall 16 divides the air supply cavity 14 into two chambers. An air supply port 17 is provided on the end wall (machine side end wall or coke side end wall) of each chamber. An air supply port regulating valve 18 is installed on the end wall corresponding to the air supply port 17. This air supply port regulating valve 18 is a common furnace door structure for coke ovens. Dividing the air supply cavity 14 into two chambers facilitates the adjustment and uniformity of the air supply volume and air supply velocity.

[0024] like Figure 4 As shown, the furnace bottom air distributor 13 has a cylindrical structure with an insertion step on its outer cylindrical surface to allow it to be inserted into the corresponding insertion hole in the flue partition 10 at the bottom of the furnace chamber. The furnace bottom air distributor 13 has a downward-facing blind air distribution hole 19, with its opening facing the air supply chamber 14 at the bottom of the furnace chamber. Four air distribution holes 20 are connected to the upper end of the blind air distribution hole 19. These holes 20 are evenly arranged circumferentially and are inclined downwards to connect with the blind air distribution hole 19. The angle α between the center line of the air distribution hole 20 and the center line of the blind air distribution hole 19 is 45°, preferably controlled between 40° and 50°. All four air distribution holes 20 arranged circumferentially on the cylindrical wall of the air distributor 13 are connected to the blind air distribution hole 19.

[0025] The above are some preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make improvements and substitutions to the technical solutions described in the foregoing embodiments. Such substitutions and improvements that violate the spirit and principles of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A high-efficiency combustion chamber bottom flue structure for a heat recovery coke oven, comprising a carbonization chamber main wall (1), a carbonization chamber (3) located between two adjacent carbonization chamber main walls (1), and a descending flue (7) and an ascending flue (2) disposed within the carbonization chamber main wall (1), characterized in that: The descending fire channel (7) and the ascending fire channel (2) are alternately arranged in the main wall (1) of the carbonization chamber; a carbonization chamber bottom plate (9) is installed at the bottom of the carbonization chamber (3), and the lower space of the carbonization chamber bottom plate (9) is divided into a bottom fire channel cavity (15) and a bottom air supply cavity (14) by a bottom fire channel partition (10); a furnace bottom air distributor (13) is installed on the bottom fire channel partition (10), and the bottom air supply cavity (14) is connected to the bottom fire channel cavity (15) through the furnace bottom air distributor (13).

2. The high-efficiency combustion chamber bottom flue structure of the heat recovery coke oven according to claim 1, characterized in that: The main wall (1) of the carbonization chamber is vertically provided with several descending fire channels (7) and ascending fire channels (2), which are arranged adjacent to each other at intervals.

3. The high-efficiency combustion chamber bottom flue structure of the heat recovery coke oven according to claim 1, characterized in that: The upper space of the carbonization chamber (3) passes through the descending fire channel inlet (6), descending fire channel (7), and descending fire channel outlet (8) in sequence to the bottom fire channel cavity (15), which is connected to the ascending fire channel (2).

4. The high-efficiency combustion chamber bottom flue structure of a heat recovery coke oven according to claim 1, 2, or 3, characterized in that: A floor support column (11) supports the floor between the fire channel partition (10) at the bottom of the chamber and the floor plate (9) of the carbonization chamber.

5. The high-efficiency combustion chamber bottom flue structure of a heat recovery coke oven according to claim 1, 2, or 3, characterized in that: The bottom flue plate (10) is supported on the flue plate support column (12), and several bottom air distributors (13) are installed on the bottom flue plate (10).

6. The high-efficiency combustion chamber bottom flue structure of the heat recovery coke oven according to claim 5, characterized in that: The furnace bottom air distributor (13) has a downward-facing air distribution blind hole (19) on its main body. At least two air distribution holes (20) are provided on the side wall of the furnace bottom air distributor (13), and the air distribution holes (20) are inclinedly connected to the air distribution blind hole (19).

7. The high-efficiency combustion chamber bottom flue structure of the heat recovery coke oven according to claim 6, characterized in that: The angle α between the center lines of the air distribution hole (20) and the air distribution blind hole (19) is 40°–50°.

8. The high-efficiency combustion chamber bottom flue structure of the heat recovery coke oven according to claim 1, characterized in that: The air supply cavity (14) at the bottom of the chamber is constructed with an air supply cavity rib wall (16) along the width direction. The air supply cavity rib wall (16) divides the air supply cavity (14) at the bottom of the chamber into two chambers, each of which is connected to an air supply port (17).

Images