Tar self-cleaning type coke oven gas burner

Abstract

The utility model discloses a tar self-cleaning type coke oven gas burner. The burner comprises a shell and an inner container, the inner container is arranged in the shell, and an interlayer cavity is formed between the inner container and the shell. Wherein an inner space defined by the inner container is a coke oven gas channel. An inner space defined by the interlayer cavity is a combustion-supporting air channel. And a porous medium layer is arranged in the coke oven gas channel. The combustor further comprises a decoking oxygen pipeline. And the decoking oxygen pipeline extends into the shell from the outside and penetrates through the combustion-supporting air channel to be connected with the porous medium layer. By adopting the coke oven gas burner disclosed by the utility model, off-line or on-line tar cleaning can be carried out without stopping gas, so that the problems of reduced process quality, energy waste, dangerous operation and the like in the prior art are avoided, and the continuous and stable supply of high-quality coke oven gas is ensured; and normal operation of the coke oven gas burner and the industrial furnace is maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to the cleaning and removal of tar in coke oven gas, in particular to a tar self-cleaning type coke oven gas burner, belongs to the coke oven gas purification treatment technical field. BACKGROUND

[0002] Coke oven gas is an important by-product gas of steel plants, with large volume and high calorific value, and is second only to natural gas in China's gas fuel. However, coke oven gas contains a large amount of tar and naphthalene. In the long-term operation process, these tar and naphthalene will accumulate and block the pipeline and the burner, causing the coke oven gas supply pipeline in the burner to be interrupted, resulting in unstable combustion and frequent failure to ignite. In addition, the coal tar entering the combustion system will also cause the gas nozzle to be blocked and coked, resulting in the entire combustion device being unable to produce normally, increasing the maintenance amount of the operating personnel, wasting energy and increasing labor intensity.

[0003] In the prior art, the cleaning of the burner generally adopts an offline scheme or an online scheme. The offline scheme refers to cleaning the burner after the burner is removed from the combustion chamber due to unstable combustion or flameout caused by blockage. The online scheme refers to cleaning the burner while it is installed on the industrial furnace. However, whether it is the offline scheme or the online scheme, in order to ensure safety, the coke oven gas in the burner and its pipeline needs to be purged and cleaned. Before the pipeline and the burner are split, a purge gas is introduced from the main pipe, and at this time, the gas supply to the corresponding burner is stopped. This will cause several problems:

[0004] (1) Stopping the gas supply will cause fluctuations in the production conditions, affect the temperature field and pressure field in the furnace, and result in a decrease in production quality or even a process shutdown: for example, after a burner of an oxidized pellet belt-type indurating machine is stopped, the flue gas temperature near the burner decreases rapidly, resulting in a decrease in the quality of pellet induration in the corresponding area; for a rotary kiln for indurating oxidized pellets, which has only one burner, stopping the gas supply to the burner means that the equipment is shut down;

[0005] (2) After the new or cleaned burner is reinstalled into the combustion chamber and the industrial kiln, a purge and ignition program needs to be performed for safety purposes, which requires nitrogen and gas, resulting in waste of materials and energy;

[0006] (3) The online cleaning method uses high-temperature gas for purging, and the tar cleaning effect is limited;

[0007] (4) The offline cleaning process wastes labor, and there may be a local positive pressure in the furnace when the burner is removed, causing high-temperature gas to be sprayed out of the burner mounting hole, which is dangerous to operate;

[0008] (5) The burner disassembled using the offline method is cooled down quickly, and the tar hardens rapidly at room temperature and adheres firmly to the inner wall of the coking coal gas passage of the burner, making it very difficult to clean and failing to achieve the expected results.

[0009] (6) Shortened burner life: When the burner is working, the ambient temperature reaches 1200℃ or even higher, and the temperature of the burner components will also exceed 600℃ or higher. After being removed and exposed to room temperature air, the material cools down rapidly from high temperature to room temperature, and the burner steel has cracked or peeled off, affecting the life of the equipment. Utility Model Content

[0010] To address the problems existing in the prior art, this utility model modifies the existing coke oven gas burner, proposing a tar self-cleaning coke oven gas burner and its usage method. In this utility model, a porous media layer is added to the coke oven gas channel of the burner, and a tar-removing oxygen pipe is connected to the porous media layer. The coke oven gas passes through the porous media layer to remove tar, and then ignites with combustion air. The tar captured by the porous media reacts with the oxygen input through the tar-removing oxygen pipe, thereby achieving the technical effect of tar removal. Using the coke oven gas burner described in this utility model, tar removal from coke oven gas no longer requires offline or online cleaning by stopping the gas supply, avoiding the problems of reduced process quality, energy waste, and operational hazards caused by this in the prior art. This ensures a continuous and stable supply of high-quality coke oven gas and maintains the normal operation of the coke oven gas burner and industrial furnaces.

[0011] Moreover, after effectively removing a large amount of tar from the coke oven gas, this invention oxidizes and releases heat from the tar, thus making full use of the chemical heat of the combustible substances in the coke oven gas. The chemical heat of the tar, which was originally unusable, is released and enters the combustion chamber along with the coke oven gas, effectively increasing the calorific value of the coke oven gas and turning waste into treasure.

[0012] According to the first embodiment of this utility model, a tar self-cleaning coke oven gas burner is provided.

[0013] A tar-self-cleaning coke oven gas burner includes a shell and an inner liner. The inner liner is disposed within the shell, and a sandwiched chamber exists between the inner liner and the shell. The internal space enclosed by the inner liner serves as a coke oven gas passage. The internal space enclosed by the sandwiched chamber serves as a combustion air passage. A porous media layer is disposed within the coke oven gas passage. The burner also includes a coke-removing oxygen pipe. The coke-removing oxygen pipe extends from the outside into the shell and passes through the combustion air passage, connecting to the porous media layer.

[0014] In this invention, m decoking oxygen pipes are connected to the porous media layer. The value of m ranges from 1 to 10, preferably from 2 to 6.

[0015] Preferably, the m said decoking oxygen gas pipes are evenly distributed around the outer periphery of the porous medium layer.

[0016] In the utility model, the decoking oxygen gas pipe is perpendicular to the axis direction of the inner container. Preferably, the inner container is coaxially arranged with the shell.

[0017] In the utility model, according to the direction of the coke oven gas, the upstream end and the downstream end of the coke oven gas passage are respectively provided with a coke oven gas inlet and a coke oven gas outlet. The upstream end and the downstream end of the combustion air passage are respectively provided with a combustion air inlet and a combustion air outlet. The shell is a constant-diameter cylindrical structure. The inner container comprises a gas inlet section, a decoking section and a gas outlet section arranged in sequence. The diameters of the gas inlet section, the decoking section and the gas outlet section are the same or different. The porous medium layer is arranged in the decoking section, and the diameter of the porous medium layer is equal to the diameter of the decoking section.

[0018] Preferably, the diameter of the decoking section is smaller than the diameters of the gas inlet section and the gas outlet section.

[0019] In the utility model, the first pressure monitoring point is located upstream of the porous medium layer, and the second pressure monitoring point is located downstream of the porous medium layer.

[0020] In the utility model, the pore diameter of the porous medium in the porous medium layer is 0.001-5mm, preferably 0.05-2mm.

[0021] According to the second embodiment of the utility model, a method for using the tar self-cleaning coke oven gas burner is provided.

[0022] The method for using the tar self-cleaning coke oven gas burner in the first embodiment comprises the following steps:

[0023] 1) coke oven gas and combustion air are respectively conveyed to the coke oven gas passage and the combustion air passage. At the same time, oxygen is conveyed to the decoking oxygen gas pipe.

[0024] 2) in the coke oven gas passage, the coke oven gas first passes through the porous medium layer, and the porous medium captures the tar in the coke oven gas. Then, the coke oven gas from which the tar is removed is discharged from the coke oven gas passage, and ignites and burns with the combustion air discharged from the combustion air passage.

[0025] 3) oxygen enters the porous medium layer through the decoking oxygen gas pipe, and the oxygen entering the porous medium area reacts with the tar captured by the porous medium, and the reaction heat is discharged together with the coke oven gas from which the tar is removed.

[0026] In this invention, in step 2), the flow velocity of coke oven gas in the porous medium layer is greater than the flame propagation velocity of coke oven gas, preferably greater than the flame propagation velocity of hydrogen.

[0027] In this invention, in step 2), the porous medium is a foamed metal material and / or a powder metallurgy material. Preferably, the pore size of the porous medium is 0.001-5 mm, more preferably 0.05-2 mm.

[0028] In this invention, the volumetric flow rate q1 of coke oven gas in the coke oven gas passage is detected. The cross-section of the porous media layer is assumed to be circular with a diameter d0. The apparent velocity v of the coke oven gas within the porous media layer is then calculated based on this. sup Specifically:

[0029]

[0030] Let the flow velocity of coke oven gas in the porous medium layer be v. fuel The apparent velocity v of coke oven gas in the porous medium layer sup The flow velocity v of coke oven gas in the porous media layer fuel Satisfy the following formula:

[0031] v sup =ε·v fuel ……(2).

[0032] In the formula: ε is the porosity of the porous medium.

[0033] Furthermore, since the flow velocity of coke oven gas in the porous medium layer is greater than the flame propagation velocity of hydrogen, we have:

[0034] v fuel >S L ……(3).

[0035] In the formula: S L This represents the flame propagation speed of hydrogen gas.

[0036] Combining formulas (1)-(3), calculate the cross-sectional diameter d0 of the porous medium layer. That is:

[0037]

[0038] In this invention, the tar content m in coke oven gas is determined. tar The tar oxidation reaction rate w, combined with the coke oven gas volume flow rate q1 in the coke oven gas channel and the cross-sectional diameter d0 of the porous media layer, is used to calculate the length L of the porous media layer along the axial direction of the coke oven gas channel. Specifically:

[0039] L>q1·m tar / (1 / 4×π·d02 ) / w……(5).

[0040] In the utility model, in the step 3), the tar content m of coke oven gas is determined tar , the volume flow rate q1 of coke oven gas in the coke oven gas passage, the coke removing oxygen flow rate q2 needed to be input into the porous medium layer is calculated.Specifically:

[0041] q2=k·j·q1·m tar / ρ1……(6).

[0042] In the formula: k is the oxygen excess coefficient, the value range of k is 1.02-1.1.j is the average molecular weight of oxygen consumed by complete oxidation of tar molecules, the value range of j is 15-30.ρ1 is the oxygen density.

[0043] As preferred, the step 3) further includes the substep of adjusting the coke removing oxygen flow rate into the porous medium layer, specifically including:

[0044] ① input the initial coke removing oxygen flow rate q2 into the porous medium layer.

[0045] ② set the threshold value of the pressure difference between the upstream end and the downstream end of the porous medium layer in the coke oven gas passage, recorded as Δp.

[0046]

[0047] In the formula: μ is the dynamic viscosity of coke oven gas, the value range of μ is 5.4-5.8Pa·s.v sup is the superficial velocity of coke oven gas in the porous medium layer.ε is the porosity of the porous medium.ρ is the density of coke oven gas.Dp is the equivalent diameter of the porous medium.L is the length of the porous medium layer.

[0048] ③ the first pressure monitoring point monitors the pressure p1 of the upstream end of the porous medium layer in real time, and the second pressure monitoring point monitors the pressure p2 of the downstream end of the porous medium layer in real time.

[0049] ④ when Z1×Δp

[0050] When p1-p2>Z2×Δp, it is judged that the coke removing oxygen flow rate input into the porous medium layer is insufficient at this time, and the coke removing oxygen flow rate into the porous medium layer is adjusted to increase.

[0051] When p1-p2≤Z1×Δp, it is judged that the coke removing oxygen flow rate input into the porous medium layer is excessive at this time, and the coke removing oxygen flow rate into the porous medium layer is adjusted to decrease.

[0052] Wherein, Z1 and Z2 are adjustment coefficients, the value range of Z1 is 1-1.05, and the value range of Z2 is 1.08-1.15.

[0053] In view of the problems of process yield reduction, energy waste, operation danger and the like caused by the need of stopping gas during the cleaning process of the existing coke oven gas burner, the utility model transforms the existing coke oven gas burner and provides a coke oven gas burner with tar self-cleaning function. The main structure of the coke oven gas burner still comprises a coke oven gas passage and a combustion air passage, wherein the core component of the tar self-cleaning function is a porous medium layer added in the coke oven gas passage, and a de-tar oxygen pipeline is connected to the porous medium layer. The coke oven gas removes tar through the porous medium layer, and then is ignited and burned with the combustion air. The tar captured by the porous medium layer reacts with the oxygen input through the de-tar oxygen pipeline, thereby achieving the technical effect of tar cleaning. The coke oven gas burner can effectively remove a large amount of tar in the coke oven gas, prevent the coke oven gas burner from being blocked by tar, and clean the tar without stopping the gas for offline or online cleaning, thereby avoiding the problems of process yield reduction, energy waste, operation danger and the like in the prior art, ensuring the continuous and stable supply of high-quality coke oven gas, and maintaining the normal operation of the coke oven gas burner and the industrial furnace.

[0054] In addition, after effectively removing a large amount of tar in the coke oven gas, the utility model oxidizes and releases heat from the tar, thereby fully utilizing the chemical heat of the combustible substances in the coke oven gas, converting the originally unusable tar chemical energy into heat energy, increasing the calorific value of the coke oven gas, and turning waste into treasure. The application uses pure oxygen to oxidize the removed tar in the coke oven gas. The oxidizing property of pure oxygen is particularly strong. Generally speaking, the higher the oxidation degree, the easier the oxidation reaction occurs, and the faster the oxidation reaction rate. The tar will rapidly oxidize under the condition of 200-300 DEG C. Under the initial normal temperature pure oxygen condition, the tar begins to oxidize and release heat. The oxidation reaction continues to release heat, and the heat storage and heat transfer of the porous medium are used to maintain the required temperature for the subsequent reaction of the tar and oxygen.

[0055] In the utility model, one or more de-tar oxygen pipelines are connected to the porous medium layer. When the number of de-tar oxygen pipelines is multiple, the multiple de-tar oxygen pipelines are preferably evenly distributed along the outer periphery of the porous medium layer. Such arrangement can inject de-tar oxygen into the porous medium from multiple directions of the burner, thereby improving the uniformity of oxygen distribution in the porous medium layer and further improving the cleaning effect of tar.

[0056] The utility model discloses a traditional coke oven gas combustor is reformed, the main body structure of coke oven gas combustor still is coke oven gas passage and combustion air passage, wherein, the coaxial arrangement of coke oven gas passage and combustion air passage (namely the coaxial arrangement of inner bag and shell). According to the trend of coke oven gas, the upstream end and downstream end of coke oven gas passage are equipped with coke oven gas inlet and coke oven gas outlet respectively, and the upstream end and downstream end of combustion air passage are equipped with combustion air inlet and combustion air outlet respectively. Coke oven gas outlet and combustion air outlet are according to the original combustor design, and the outlet size, swirl angle etc. do not change.

[0057] In the utility model, the shell can be set as equal-diameter cylindrical structure, and the inner bag arranged inside the shell comprises air inlet section, coke removing section and air outlet section arranged in sequence, wherein the diameters of the air inlet section, coke removing section and air outlet section are same or different. The added porous medium layer in the utility model is arranged in the coke removing section. In order to avoid the situation that part of coke oven gas does not remove tar without passing through the porous medium layer when passing through the coke oven gas passage, the diameter (i.e. cross-sectional diameter) of the porous medium layer is equal to the diameter of the coke removing section. When the diameters of the air inlet section, coke removing section and air outlet section of the inner bag are same, the inner bag is also equal-diameter cylindrical structure. In order to avoid waste of material and energy, and considering the pressure in the coke oven gas passage, the diameter of the coke removing section is preferably set to be smaller than the diameters of the air inlet section and air outlet section. As shown in the figure, the core components for tar self-cleaning are the porous medium layer and coke removing oxygen pipeline. The cross-sectional diameter of the porous medium layer is d0, the combustion air passage is same as the traditional combustor, and the size is d2 (i.e. the cross-sectional size of the shell), the combustion air is sent into the combustion chamber (i.e. combustion air outlet) at a certain speed and angle; the size of the coke oven gas is d1 (i.e. the size of the air inlet section) before entering the coke removing section, and is changed (increased or decreased) to d0 after entering the coke removing section, and the cleaned coke oven gas is sent into the combustion chamber after changing the size to d3 (i.e. the size of the air outlet section) after passing through the coke removing section. Figure 3

[0058] As preferred, the utility model also sets first pressure monitoring point and second pressure monitoring point in the coke oven gas passage, which are located at the upstream and downstream of the porous medium layer respectively, for real-time monitoring of the upstream pressure and downstream pressure of the porous medium layer, so as to ensure the cleaning effect of tar, to ensure the continuous and stable supply of high-quality coke oven gas, to maintain the normal operation of the combustor and industrial furnace, and to improve the system safety.

[0059] ​The coke oven gas burner of the utility model in operation, coke oven gas and combustion air according to the parameter of industrial furnace kiln design and production is input coke oven gas burner, after the burner forms flame combustion in the combustion chamber. At the same time, the coke oxygen is injected into the porous medium layer from the multiple directions of the burner through the coke oxygen pipeline. The original combustion air channel still passes through the same flow of combustion air for gas combustion. A section of porous medium layer is added in the original coke oven gas channel, and the coke oven gas flows to the coke oven gas outlet after passing through the porous medium, and then burns with the combustion air. In this process, the tar in the coke oven gas will be captured by the porous medium, and then the oxidation reaction will occur with the coke oxygen in the porous medium area, so that the technical effect of tar cleaning is achieved.

[0060] Based on the above-mentioned tar self-cleaning coke oven gas burner, the utility model further puts forward the use method of the coke oven gas burner, which also includes the input parameters of the coke oxygen, the design parameters of the porous medium layer structure and the like. The use method of the coke oven gas burner, specifically includes the following steps:

[0061] 1) coke oven gas and combustion air are respectively conveyed to the coke oven gas channel and the combustion air channel. At the same time, oxygen is conveyed to the coke oxygen pipeline.

[0062] 2) in the coke oven gas channel, coke oven gas first passes through the porous medium layer, and the tar in the coke oven gas is captured by the porous medium; then, the coke oven gas without tar is discharged from the coke oven gas channel, and burns with the combustion air discharged from the combustion air channel.

[0063] 3) oxygen enters the porous medium layer through the coke oxygen pipeline, and the oxygen entering the porous medium area reacts with the tar captured by the porous medium, and the reaction heat is discharged with the coke oven gas without tar.

[0064] In the above steps, in order to ensure that the oxygen reacts with the tar instead of the coke oven gas, the gas flow velocity of the coke oven gas, that is, the flow velocity v fuel S of the coke oven gas in the porous medium layer needs to be maintained

[0065] The flame propagation velocity S L of H2 is ∞ = f (p, T, T H2 ) in the utility model. In the utility model, S LThe value range is about 0.25-0.4 m / s. As mentioned above, the flow velocity of the coke oven gas in the porous medium layer should satisfy v fuel <S L .

[0066] The industrial furnace requires that the coke oven gas volume flow of a single burner, i.e. the coke oven gas volume flow in the coke oven gas passage, is q1, and the superficial velocity v sup of the coke oven gas in the porous medium layer is:

[0067] v sup =q1 / A.

[0068] A is the area of the cross section of the porous medium layer. Assuming that the cross section is circular and the diameter is d0, then

[0069] A=0.25π·d0 2 .

[0070] The superficial velocity v sup of the coke oven gas in the porous medium layer and the flow velocity v fuel of the coke oven gas in the porous medium layer satisfy the following formula:

[0071] v sup =ε·v fuel .

[0072] ε is the porosity of the porous medium, and in the utility model, the value range of ε is 0.85-0.95.

[0073] Therefore, the diameter of the cross section of the porous medium layer through which the coke oven gas flows should satisfy:

[0074]

[0075] In the utility model, the pore diameter d po of the porous medium has a value range of 0.001-5 mm, and the porous medium is preferably a foamed metal material and a powder metallurgy material, and the pore diameter range thereof is preferably 0.05-2 mm, so that most of the tar in the coke oven gas can be attached to the surface of the pores of the porous medium and captured by the porous medium, and at the same time, the system will not be increased with a large flow resistance. The captured tar is oxidized under the action of the de-tarring oxygen to generate CO2 and H2O, or is incompletely oxidized to generate small-molecule alkanes, alkenes or alkynes.

[0076] To ensure that the tar is completely oxidized, the length L of the porous medium layer in the axis direction of the coke oven gas passage should satisfy:

[0077] L>q1·m tar / (1 / 4×π·d0 2 ) / w.

[0078] q1 is the volume flow of coke oven gas in the coke oven gas channel, m tar The tar content in the coke oven gas is generally in the range of 0.02-0.05 g / m 3 The tar oxidation reaction rate w is related to the tar component, the oxygen component concentration A O2 , the porosity of the porous medium ε, the thermal conductivity of the porous medium k1, and the specific heat capacity of the porous medium c p The tar component is measured by the average carbon content M C , the average hydrogen content M H , and the average oxygen content M O .

[0079] The tar oxidation reaction rate needs to be determined according to experiments, and the correlation with other factors is as follows:

[0080] w = f (M C , M H , M O , the gas component concentration A O2 , ε, k1, and c p ).

[0081] Generally, the larger M C , M H , A O2 , k1, and c p , or the smaller M O and ε, the larger the tar oxidation reaction rate w. For example, the tar oxidation reaction rate w = 0.5 g / (m 3 ·s).

[0082] To ensure complete removal of the tar, the flow rate q2 of the tar-removing oxygen input into the porous medium should satisfy:

[0083] q2 = k·j·q1·m tar / ρ1.

[0084] ρ1 is the oxygen density, ρ1 = 1.429 kg / m 3 at standard state; k is the oxygen excess coefficient, and its value range is 1.02-1.1; j is the average molecular weight of the oxygen consumed for complete oxidation of the tar molecules, i.e. the complete oxidation reaction of the tar attached to the porous medium can be realized, and the proportion of the combustible components (usually H2 accounts for 50-60% of the volume, CH4 accounts for 20-30% of the volume, and CO accounts for 5-10% of the volume) of the coke oven gas itself is not affected:

[0085] Tar + j O2→ a CO2 + b H2O;

[0086] j = M C + 1 / 2M H - 1 / 2M Oj is generally 15-30.

[0087] The tar oxidation process is an exothermic reaction, and the heat release per unit mass of tar combustion is f tar Therefore, the coke oven gas burner can increase heat into the coke oven gas.

[0088] Q = f tar · q1 · m tar .

[0089] Further preferably, after calculating the coke-removing oxygen flow input into the porous medium, the utility model can also adjust the coke-removing oxygen flow entering the porous medium layer in real time as needed, specifically:

[0090] ① Input the initial coke-removing oxygen flow q2 into the porous medium layer.

[0091] ② Set the threshold value of the pressure difference between the upstream end and the downstream end of the porous medium layer in the coke oven gas channel, denoted as Δp.

[0092] Under normal working conditions, there is no tar blockage in the porous medium layer, i.e. the overall area of the porous medium layer is through, at which time there is a pressure difference between the upstream and downstream of the porous medium layer. When tar blockage occurs in the porous medium layer, the detected pressure difference between the upstream and downstream of the porous medium layer will be greater than that under normal working conditions. The threshold value of the above-mentioned pressure difference is the pressure difference between the upstream and downstream of the porous medium layer under normal working conditions.

[0093] Wherein, the pressure difference threshold Δp is calculated by Ergun formula:

[0094]

[0095] In the formula: μ is the dynamic viscosity of coke oven gas, the value range of μ is 5.4-5.8 Pa·s; v sup is the superficial velocity of coke oven gas in the porous medium layer; ε is the porosity of the porous medium; ρ is the density of coke oven gas, the value range of ρ is 0.4-0.8 kg / m 3 ; Dp is the equivalent diameter of the porous medium, here Dp = d po , i.e. the same value as the pore diameter of the porous medium mentioned above; L is the length of the porous medium layer.

[0096] ④ When Z1×Δp

[0097] When p1-p2>Z2*Delta p, it indicates that tar is accumulated in the porous medium layer at this time, which causes the pressure difference between the upstream and downstream of the porous medium layer to increase, that is, it is judged that the oxygen flow input into the porous medium layer is insufficient, and tar should not be allowed to continue to accumulate, so the operation of increasing the oxygen supplement amount is performed to adjust the oxygen flow into the porous medium layer.

[0098] When p1-p2<=Z1*Delta p, it indicates that tar is less accumulated or not accumulated in the porous medium layer at this time, and in view of saving oxygen and preventing a large amount of reaction between oxygen and combustible components in the coke oven gas, it is judged that the oxygen flow input into the porous medium layer is excessive at this time, so the operation of reducing the oxygen supplement amount is performed to adjust the oxygen flow into the porous medium layer.

[0099] Through adjustment, the pressure difference between the upstream and downstream of the porous medium layer is finally controlled in Z1*Delta p

[0100] In the present application, the shell of the coke oven gas burner can be provided as an equal-diameter cylindrical structure, wherein the diameter of the shell is 0.01-10m, preferably 0.05-8m, preferably 0.1-5m, more preferably 0.15-3m, and further preferably 0.2-2m.

[0101] Compared with the prior art, the present application has the following beneficial technical effects:

[0102] 1. The coke oven gas burner of the present application does not need to stop gas for offline or online cleaning of tar in coke oven gas, avoiding the problems of process yield reduction, energy waste, operation danger and the like in the prior art, thereby ensuring the continuous and stable supply of high-quality coke oven gas and maintaining the normal operation of the coke oven gas burner and the industrial furnace.

[0103] 2. After effectively removing a large amount of tar in the coke oven gas, the present application oxidizes and releases heat from the tar, thereby fully utilizing the chemical heat of the combustible substances in the coke oven gas, releasing the chemical heat of the tar which cannot be utilized originally and entering the combustion chamber along with the coke oven gas, effectively increasing the calorific value of the coke oven gas, and turning waste into treasure.

[0104] 3. The high-purity decoking oxygen used in the present application can ensure complete cleaning of tar, thereby ensuring the combustion effect of the coke oven gas and prolonging the service life of the burner.

[0105] 4、 the utility model discloses the input parameter of de-coking oxygen, the design parameter of porous medium layer structure etc. have carried out the concrete definition, still realizes the real-time on-demand adjustment of input de-coking oxygen flow based on the detection of pressure to ensure that in the porous medium layer, oxygen is oxidized with the tar and not with the coke oven gas oxidized, can also guarantee that the tar is oxidized completely, increase the coke oven gas heating value, prevent the tar from blocking the combustor, maintain the stable operation of system high quality and safety.

[0106] 4、 the utility model discloses the transformation on the basis of traditional combustor, simple structure has no movable part, and equipment operation stability is good. BRIEF DESCRIPTION OF DRAWINGS

[0107] Figure 1 It is the structure schematic diagram of a tar self-cleaning type coke oven gas combustor of the utility model;

[0108] Figure 2 It is Figure 1 the section view of A-A position in middle;

[0109] Figure 3 It is the size mark schematic diagram of coke oven gas combustor in the utility model.

[0110] REFERENCE SIGNS:

[0111] 1: shell;2: inner container;3: coke oven gas passage;4: combustion air passage;5: porous medium layer;6: de-coking oxygen pipeline;701: first pressure monitoring point;702: second pressure monitoring point. DETAILED DESCRIPTION

[0112] The technical scheme of the utility model is illustrated below, and the scope of protection requested by the utility model includes but is not limited to the following embodiments.

[0113] According to the first embodiment of the utility model, a tar self-cleaning type coke oven gas combustor is provided.

[0114] A tar self-cleaning type coke oven gas combustor, which comprises a shell 1 and an inner container 2. The inner container 2 is arranged in the shell 1, and a sandwich cavity is formed between the inner container 2 and the shell 1. The internal space surrounded by the inner container 2 is a coke oven gas passage 3. The internal space surrounded by the sandwich cavity is a combustion air passage 4. A porous medium layer 5 is arranged in the coke oven gas passage 3. The combustor further comprises a de-coking oxygen pipeline 6. The de-coking oxygen pipeline 6 extends into the shell 1 from the outside and is connected with the porous medium layer 5 through the combustion air passage 4.

[0115] In the utility model, the porous medium layer 5 is connected with m de-coking oxygen pipelines 6. The value range of m is 1-10, and preferably 2-6.

[0116] Preferably, the m de-coking oxygen pipes 6 are evenly distributed around the outer periphery of the porous medium layer 5.

[0117] In the utility model, the de-coking oxygen pipe 6 is arranged perpendicularly to the axis direction of the inner container 2. Preferably, the inner container 2 is coaxially arranged with the shell 1.

[0118] In the utility model, according to the flow direction of the coke oven gas, the upstream end and the downstream end of the coke oven gas passage 3 are respectively provided with a coke oven gas inlet and a coke oven gas outlet. The upstream end and the downstream end of the combustion air passage 4 are respectively provided with a combustion air inlet and a combustion air outlet. The shell 1 is a constant-diameter cylindrical structure. The inner container 2 comprises a gas inlet section, a de-coking section and a gas outlet section arranged in sequence. The diameters of the gas inlet section, the de-coking section and the gas outlet section are the same or different. The porous medium layer 5 is arranged in the de-coking section, and the diameter of the porous medium layer 5 is equal to the diameter of the de-coking section.

[0119] Preferably, the diameter of the de-coking section is smaller than the diameters of the gas inlet section and the gas outlet section.

[0120] In the utility model, the first pressure monitoring point 701 is located upstream of the porous medium layer 5. The second pressure monitoring point 702 is located downstream of the porous medium layer 5.

[0121] In the utility model, the pore diameter of the porous medium in the porous medium layer 5 is 0.001-5mm, preferably 0.05-2mm.

[0122] Example 1

[0123] As shown in Figure 1 Figure 1, a tar self-cleaning coke oven gas burner comprises a shell 1 and an inner container 2. The inner container 2 is arranged in the shell 1, and a sandwich cavity is formed between the inner container 2 and the shell 1. The internal space surrounded by the inner container 2 is a coke oven gas passage 3. The internal space surrounded by the sandwich cavity is a combustion air passage 4. A porous medium layer 5 is arranged in the coke oven gas passage 3. The burner further comprises a de-coking oxygen pipe 6. The de-coking oxygen pipe 6 extends into the shell 1 from the outside and is connected with the porous medium layer 5 through the combustion air passage 4.

[0124] Example 2

[0125] As shown in Figure 2 Figure 2, the example 1 is repeated, except that 4 de-coking oxygen pipes 6 are connected to the porous medium layer 5.

[0126] Example 3

[0127] Example 1 is repeated, except that 2 coke-removing oxygen pipes 6 are connected to the porous medium layer 5.

[0128] Example 4

[0129] Example 1 is repeated, except that 6 coke-removing oxygen pipes 6 are connected to the porous medium layer 5.

[0130] Example 5

[0131] Example 2 is repeated, except that the 4 coke-removing oxygen pipes 6 are evenly distributed around the outer periphery of the porous medium layer 5.

[0132] Example 6

[0133] Example 5 is repeated, except that the coke-removing oxygen pipes 6 are arranged perpendicular to the axis direction of the inner container 2.

[0134] Example 7

[0135] Example 6 is repeated, except that the inner container 2 is arranged coaxially with the shell 1.

[0136] Example 8

[0137] Example 7 is repeated, except that, according to the flow direction of the coke oven gas, a coke oven gas inlet and a coke oven gas outlet are respectively arranged at the upstream end and the downstream end of the coke oven gas passage 3. A combustion air inlet and a combustion air outlet are respectively arranged at the upstream end and the downstream end of the combustion air passage 4. The shell 1 is a constant-diameter cylindrical structure. The inner container 2 comprises a gas inlet section, a coke-removing section and a gas outlet section arranged in sequence. The diameters of the gas inlet section, the coke-removing section and the gas outlet section are the same, i.e. the inner container 2 is also a constant-diameter cylindrical structure. The porous medium layer 5 is arranged in the coke-removing section, and the diameter of the porous medium layer 5 is equal to the diameter of the coke-removing section.

[0138] Example 9

[0139] Example 7 is repeated, except that, according to the flow direction of the coke oven gas, a coke oven gas inlet and a coke oven gas outlet are respectively arranged at the upstream end and the downstream end of the coke oven gas passage 3. A combustion air inlet and a combustion air outlet are respectively arranged at the upstream end and the downstream end of the combustion air passage 4. The shell 1 is a constant-diameter cylindrical structure. The inner container 2 comprises a gas inlet section, a coke-removing section and a gas outlet section arranged in sequence. The diameters of the gas inlet section, the coke-removing section and the gas outlet section are not the same. The porous medium layer 5 is arranged in the coke-removing section, and the diameter of the porous medium layer 5 is equal to the diameter of the coke-removing section.

[0140] Example 10

[0141] Example 9 is repeated, except that the diameter of the coke-removing section is smaller than the diameters of the gas inlet section and the gas outlet section.

[0142] Example 11

[0143] Example 10 is repeated except that a first pressure monitoring point 701 and a second pressure monitoring point 702 are further provided in the coke oven gas passage 3. The first pressure monitoring point 701 is located upstream of the porous medium layer 5. The second pressure monitoring point 702 is located downstream of the porous medium layer 5.

[0144] Example 12

[0145] Example 11 is repeated except that the pore size of the porous medium in the porous medium layer 5 is 1.5 mm.

[0146] Example 13

[0147] Example 11 is repeated except that the pore size of the porous medium in the porous medium layer 5 is 2 mm.

[0148] Example 14

[0149] Example 11 is repeated except that the pore size of the porous medium in the porous medium layer 5 is 0.05 mm.

[0150] Example 15

[0151] Example 11 is repeated except that the pore size of the porous medium in the porous medium layer 5 is 0.1 mm.

[0152] A method of using the tar self-cleaning coke oven gas burner described in this embodiment, the method comprising the following steps:

[0153] 1) The coke oven gas and combustion air are respectively delivered to the coke oven gas passage 3 and the combustion air passage 4. At the same time, oxygen is delivered to the decoking oxygen pipeline 6.

[0154] 2) In the coke oven gas passage 3, the coke oven gas first passes through the porous medium layer 5, and the tar in the coke oven gas is captured by the porous medium. Then, the coke oven gas from which the tar is removed is discharged from the coke oven gas passage 3 and burns with the combustion air discharged from the combustion air passage 4.

[0155] 3) The oxygen enters the porous medium layer 5 through the decoking oxygen pipeline 6, and the oxygen entering the porous medium area reacts with the tar captured by the porous medium to generate heat, which is discharged together with the coke oven gas from which the tar is removed.

Claims

1. A tar self-cleaning coke oven gas burner, characterized by: The burner comprises a shell (1) and an inner container (2); the inner container (2) is arranged in the shell (1), and a sandwich cavity is formed between the inner container (2) and the shell (1); wherein the internal space surrounded by the inner container (2) is a coke oven gas channel (3); the internal space surrounded by the sandwich cavity is a combustion air channel (4); a porous medium layer (5) is arranged in the coke oven gas channel (3); the burner further comprises a decoking oxygen pipeline (6); the decoking oxygen pipeline (6) extends into the shell (1) from the outside and is connected with the porous medium layer (5) by penetrating through the combustion air channel (4).

2. The coke oven gas burner according to claim 1, characterized in that: The porous medium layer (5) is connected with m decoking oxygen pipelines (6); the value range of m is 1-10.

3. The coke oven gas burner according to claim 2, characterized in that: The value range of m is 2-6.

4. The coke oven gas burner of claim 2, characterized by: The m decoking oxygen pipelines (6) are uniformly distributed around the outer periphery of the porous medium layer (5).

5. The coke oven gas burner according to any one of claims 1-3, characterized in that: The decoking oxygen pipeline (6) is arranged perpendicularly to the axis direction of the inner container (2).

6. The coke oven gas burner of claim 5, characterized in that: The inner container (2) and the shell (1) are coaxially arranged.

7. The coke oven gas burner according to any one of claims 1-4, 6, characterized in that: According to the direction of the coke oven gas, the upstream end and the downstream end of the coke oven gas channel (3) are respectively provided with a coke oven gas inlet and a coke oven gas outlet; the upstream end and the downstream end of the combustion air channel (4) are respectively provided with a combustion air inlet and a combustion air outlet; wherein the shell (1) is a constant-diameter cylindrical structure; the inner container (2) comprises a gas inlet section, a decoking section and a gas outlet section arranged in sequence; the diameters of the gas inlet section, the decoking section and the gas outlet section are the same or different; the porous medium layer (5) is arranged in the decoking section, and the diameter of the porous medium layer (5) is equal to the diameter of the decoking section.

8. The coke oven gas burner of claim 5, characterized by: According to the direction of the coke oven gas, the upstream end and the downstream end of the coke oven gas channel (3) are respectively provided with a coke oven gas inlet and a coke oven gas outlet; the upstream end and the downstream end of the combustion air channel (4) are respectively provided with a combustion air inlet and a combustion air outlet; wherein the shell (1) is a constant-diameter cylindrical structure; the inner container (2) comprises a gas inlet section, a decoking section and a gas outlet section arranged in sequence; the diameters of the gas inlet section, the decoking section and the gas outlet section are the same or different; the porous medium layer (5) is arranged in the decoking section, and the diameter of the porous medium layer (5) is equal to the diameter of the decoking section.

9. The coke oven gas burner of claim 7, characterized by: The diameter of the decoking section is smaller than the diameters of the gas inlet section and the gas outlet section.

10. The coke oven gas burner of claim 8, characterized by: The diameter of the decoking section is smaller than the diameters of the gas inlet section and the gas outlet section.

11. The coke oven gas burner according to any one of claims 1-4, 6, 8-10, characterized in that: The coke oven gas channel (3) is further provided with a first pressure monitoring point (701) and a second pressure monitoring point (702); wherein the first pressure monitoring point (701) is located upstream of the porous medium layer (5); the second pressure monitoring point (702) is located downstream of the porous medium layer (5).

12. The coke oven gas burner according to any one of claims 1-4, 6, 8-10, characterized in that: The pore diameter of the porous medium in the porous medium layer (5) is 0.001-5mm.

13. The coke oven gas burner of claim 12, characterized by: The pore diameter of the porous medium in the porous medium layer (5) is 0.05-2mm.

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