A purification device for fuel gas containing harmful impurities

Abstract

The utility model discloses a purification device for fuel gas containing harmful impurities, comprising: a support seat, a reactor shell, an inlet pipe, a gas distributor, a filter support net, an inert protection porcelain ball layer, a primary desulfurization catalytic bed, a secondary desulfurization catalytic bed, a dechlorination catalytic bed, an outlet gas collecting chamber, a gas outlet pipe, and a discharge port. Through the above manner, the utility model is a purification device for fuel gas containing harmful impurities. By simultaneously loading the desulfurization and dechlorination catalytic beds in one device, the desulfurization and dechlorination reactions can be completed in one device, with high integration, small investment, small footprint, and simple operation.

Description

Technical Field

[0001] The utility model relates to the field of industrial furnaces, in particular to a purification device for fuel gas containing harmful impurities. Background Art

[0002] Industrial furnaces and gas boilers used in industries such as petrochemicals, chemicals, chemical fibers, glass ceramics and building materials generally use self-produced fuel gas or purchased natural gas, or a mixture of the two, that has undergone centralized desulfurization as fuel gas. In some industrial furnaces, the non-condensable gas produced by the device itself is mixed with the fuel gas from the pipeline network as the fuel gas for the industrial furnace of the device.

[0003] Although the self-produced fuel gas has been desulfurized, it still contains trace amounts of H2S, organic sulfur, ammonia and other impurities; purchased natural gas generally contains trace amounts of H2S and organic sulfur; the self-produced non-condensable gas in some devices contains trace amounts of harmful substances such as HCL, ammonia and ammonium salts.

[0004] The harmful substances such as H2S, organic sulfur, HCL, ammonia, etc. contained in the fuel gas will undergo chemical reactions. The NH4Cl and (NH4)2S generated by the reactions will form salts and precipitate at low temperatures or dead corners, causing blockage and corrosion of the flame arrester and metal hose on the industrial furnace burner pipeline, affecting operation and safety.

[0005] At the same time, H2S, organic sulfur, etc. contained in the fuel gas will generate SOx after the combustion reaction, which will cause corrosion to the equipment and components in the low-temperature parts of the industrial furnace, and in severe cases will cause the failure of the equipment and components.

[0006] The existing desulfurization and dechlorination equipment are all arranged separately, that is, the primary desulfurization equipment, secondary desulfurization equipment and dechlorination equipment are arranged separately. Sometimes, in order to achieve the purpose of long-term operation, spare equipment must be set up to switch operations when replacing failed catalysts, which leads to large investment, large floor space, complex system and difficult operation. Utility Model Content

[0007] In order to solve the above technical problems, a technical solution adopted by the utility model is:

[0008] Provided is a purification device for fuel gas containing harmful impurities, comprising: a support seat, a reactor shell, an inlet pipe, a gas distributor, a filter support net, an inert protection porcelain ball layer, a primary desulfurization catalytic bed, a secondary desulfurization catalytic bed, a dechlorination catalytic bed, an outlet gas collection chamber, a gas outlet pipe, and a discharge port.

[0009] The reactor shell is arranged on the support seat, the upper part of the reactor shell is connected with an inlet pipe and a loading inlet, the reactor shell is provided with the gas distributor connected with the inlet pipe, the bottom of the reactor shell is provided with the outlet gas collecting chamber, the gas outlet pipe is communicated with the outlet gas collecting chamber, and the discharge port is communicated with and arranged at the lower part of the reactor shell.

[0010] The primary desulfurization catalytic bed, the secondary desulfurization catalytic bed and the dechlorination catalytic bed are arranged in the reactor shell, the secondary desulfurization catalytic bed is located downstream of the primary desulfurization catalytic bed, and the dechlorination catalytic bed is arranged upstream of the primary desulfurization catalytic bed, downstream of the secondary desulfurization catalytic bed or between the primary desulfurization catalytic bed and the secondary desulfurization catalytic bed. The filter support mesh is laid above and below each catalytic bed, and the inert protection porcelain ball layer is arranged on the uppermost filter support mesh, between two adjacent filter support meshes and in the outlet gas collecting chamber.

[0011] In a preferred embodiment of the present invention, the loading inlet and the inlet pipe are integrated into a structure, wherein the loading inlet includes a manhole flange and a manhole flange cover, and the manhole flange cover is arranged on the inlet pipe through the manhole flange.

[0012] In a preferred embodiment of the present invention, the loading inlet and the inlet pipe are split structures, wherein the loading inlet includes a manhole door independently arranged on the upper part of the reactor shell.

[0013] In a preferred embodiment of the utility model, a sampling port is provided on the gas outlet pipe.

[0014] In a preferred embodiment of the present invention, a pressure gauge is connected to the gas outlet pipe.

[0015] In a preferred embodiment of the present invention, a thermocouple or a thermometer is provided in each catalytic bed.

[0016] In a preferred embodiment of the present invention, the diameter of the ceramic balls in the inert ceramic ball layer is 5-50 mm.

[0017] In a preferred embodiment of the present invention, the filter support mesh is made of 316 stainless steel wire mesh.

[0018] The utility model has the beneficial effects of simultaneously loading desulfurization and dechlorination catalytic beds in one device, thereby achieving desulfurization and dechlorination reactions in one device, with high integration, low investment, small footprint and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0020] Figure 1 This is a schematic diagram of the structure of a purifying device for fuel gas containing harmful impurities according to the utility model from a side view;

[0021] Figure 2 The utility model is a schematic structural diagram of another side view of a purification device for fuel gas containing harmful impurities. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-2 , the utility model embodiment includes:

[0024] A purification device for fuel gas containing harmful impurities is used for desulfurization and dechlorination of fuel gas. Its structure includes a support base 1, a reactor shell 2, an inlet pipe 3, a gas distributor 4, a filter support net 5, an inert protection porcelain ball layer 6, a primary desulfurization catalytic bed 7, a secondary desulfurization catalytic bed 8, a dechlorination catalytic bed 9, an outlet gas collecting chamber 10, a gas outlet pipe 11, and a discharge port 12.

[0025] The reactor shell is arranged on the support seat, and the inlet pipe is connected with the inlet at the top end of the reactor shell to input the fuel gas to be treated into the reactor shell, and the end of the inlet pipe extending into the reactor shell is connected to the gas distributor to make the gas entering the reactor shell evenly distributed. The upper part of the reactor shell is provided with a loading inlet for operators to enter and exit and load catalysts and porcelain balls.

[0026] Further preferably, the loading inlet includes a manhole, a manhole flange 13 and a manhole flange cover 14, and the manhole flange cover is arranged on the manhole through the manhole flange. When the amount of fuel gas to be processed is relatively small or the equipment is not large in size, the manhole on the equipment for loading catalyst and for operators to enter and exit during inspection is integrated with the fuel gas inlet pipe, that is, the inlet pipe and the manhole are combined into one structure.

[0027] Further preferably, the loading inlet includes a manhole door 15 independently arranged on the upper part of the reactor shell. When the amount of fuel gas to be processed is relatively large or the equipment size is relatively large, the manhole provided on the equipment for loading catalyst and for operators to enter and exit during inspection is separately arranged from the fuel gas inlet pipe.

[0028] The outlet gas collecting chamber is arranged at the bottom of the reactor shell, the gas outlet pipe is arranged at the bottom end of the reactor shell and is communicated with the outlet gas collecting chamber, and the discharge port is arranged at the lower part of the reactor shell for unloading the deactivated catalyst.

[0029] Further preferably, a sampling port 16 is provided on the gas outlet pipe to sample and analyze the gas, thereby monitoring the sulfur and chlorine contents in the outlet gas.

[0030] Further preferably, the gas outlet pipe is connected with a pressure gauge 17 for monitoring the gas outlet pressure. When the pressure reaches a set value, the catalyst needs to be replaced.

[0031] The primary desulfurization catalytic bed, the secondary desulfurization catalytic bed and the dechlorination catalytic bed are loaded in the reactor shell, the secondary desulfurization catalytic bed is located downstream of the primary desulfurization catalytic bed, and the dechlorination catalytic bed is arranged upstream of the primary desulfurization catalytic bed, downstream of the secondary desulfurization catalytic bed or between the primary desulfurization catalytic bed and the secondary desulfurization catalytic bed.

[0032] The primary desulfurization catalyst is used to remove organic sulfur and part of H2S in the gas; the secondary desulfurization catalyst is used to remove the remaining S; the dechlorination catalyst is used to remove HCL, chloride ions, etc. in the gas.

[0033] Further preferably, according to the gas flow direction, the dechlorination catalyst bed is loaded upstream, the primary desulfurization catalyst bed is loaded in the middle, and the secondary desulfurization catalyst bed is loaded downstream. Alternatively, the primary desulfurization catalyst bed is loaded upstream, the dechlorination catalyst bed is loaded in the middle, and the secondary desulfurization catalyst bed is loaded downstream. Alternatively, the primary desulfurization catalyst bed is loaded upstream, the secondary desulfurization catalyst bed is loaded in the middle, and the dechlorination catalyst bed is loaded downstream.

[0034] The loading amount of each catalyst layer can be calculated and determined based on the content of harmful substances and other impurities detected by the flow meter of the fuel gas to be processed in the bed layer, so that the service life of each catalyst bed layer can be kept consistent and each catalyst bed layer can be loaded and unloaded at the same time.

[0035] Further preferably, a thermocouple or thermometer 18 is provided in each catalytic bed layer to monitor the temperature of each gas section.

[0036] The filter support net is laid above and below each section of the catalytic bed, that is, there are two filter support nets between two adjacent catalytic beds, and a gap is set between the two adjacent filter support nets to facilitate the loading of the inert protection porcelain ball layer. The filter support net can not only play the role of gas distribution, filtering small particles of catalyst entrained in the gas or filtering impurities entering the bed, but also prevent the bed from falling and support the bed.

[0037] The inert protection ceramic ball layer is arranged on the filter support net located below the body distributor (i.e., the first uppermost surface), between two adjacent filter support nets, and in the outlet gas collection chamber. The inert protection ceramic ball layer can be used to support and cover the catalyst bed in the reactor. The upper and lower filling of the ceramic balls prevents the liquid and gas from directly rushing / blowing to the catalyst, so as to buffer the impact of the liquid and gas entering the reactor on the catalyst, protect the catalyst, and improve the distribution of the liquid and gas in the reactor, so that the gas or liquid is distributed more evenly, further promote the liquid and gas to react chemically with the catalyst more fully, and improve the quality and effect of purification.

[0038] Further preferably, the diameter of the ceramic balls in the inert ceramic ball layer is 5-50 mm.

[0039] Further preferably, the filter support mesh is made of 316 stainless steel wire mesh or wire mesh of other applicable materials.

[0040] Working principle:

[0041] The fuel gas that needs to be purified enters the reactor shell from the outside of the device through the inlet pipe through the gas distributor, passes through the inert protection porcelain ball layer loaded on the upper part layer by layer, enters each catalyst bed layer, and reacts with the catalyst. Finally, the purified gas is collected by the gas collecting chamber and discharged from the device through the gas outlet pipe. The fuel gas that needs to be purified can enter from the upper part of the device shell or from the lower part of the device shell.

[0042] In actual use, when the temperature of the fuel gas entering the reactor is between room temperature and 190°C, the sulfur content is ≤200PPMV, and the chlorine content is ≤50PPMV, after desulfurization treatment through the primary desulfurization catalytic bed and the secondary desulfurization catalytic bed, the sulfur content of the desulfurized gas is reduced to 0.1PPMV~5PPMV, and after dechlorination through the dechlorination catalytic bed, the chlorine content of the gas is reduced to 0.1PPMV~1.0PPMV.

[0043] The utility model has the beneficial effect of a purification device for fuel gas containing harmful impurities: by simultaneously loading desulfurization and dechlorination catalytic beds in one device, desulfurization and dechlorination reactions can be completed in one device, with high integration, small investment, small footprint and simple operation.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A purification device for fuel gas containing harmful impurities, characterized in that: include: Support seat, reactor shell, inlet pipe, gas distributor, filter support net, inert protection porcelain ball layer, primary desulfurization catalytic bed, secondary desulfurization catalytic bed, dechlorination catalytic bed, outlet gas collection chamber, gas outlet pipe, discharge port, The reactor shell is arranged on the support seat, the upper part of the reactor shell is connected with an inlet pipe and a loading inlet, the reactor shell is provided with the gas distributor connected with the inlet pipe, the bottom of the reactor shell is provided with the outlet gas collecting chamber, the gas outlet pipe is communicated with the outlet gas collecting chamber, and the discharge port is communicated with and arranged at the lower part of the reactor shell. The primary desulfurization catalytic bed, the secondary desulfurization catalytic bed and the dechlorination catalytic bed are arranged in the reactor shell, the secondary desulfurization catalytic bed is located downstream of the primary desulfurization catalytic bed, and the dechlorination catalytic bed is arranged upstream of the primary desulfurization catalytic bed, downstream of the secondary desulfurization catalytic bed or between the primary desulfurization catalytic bed and the secondary desulfurization catalytic bed. The filter support mesh is laid above and below each catalytic bed, and the inert protection porcelain ball layer is arranged on the uppermost filter support mesh, between two adjacent filter support meshes and in the outlet gas collecting chamber.

2. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: The loading inlet and the inlet pipe are integrated into a structure, wherein the loading inlet comprises a manhole flange and a manhole flange cover, and the manhole flange cover is arranged on the inlet pipe through the manhole flange.

3. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: The loading inlet and the inlet pipe are of separate structures, wherein the loading inlet comprises a manhole door independently arranged on the upper part of the reactor shell.

4. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: The gas outlet pipe is provided with a sampling port.

5. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: The gas outlet pipe is connected with a pressure gauge.

6. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: A thermocouple or thermometer is provided in each catalytic bed.

7. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: The diameter of the porcelain balls in the inert protection porcelain ball layer is 5-50 mm.

8. A purification device for fuel gas containing harmful impurities according to claim 1, characterized in that: The filter support mesh is made of 316 stainless steel wire mesh.

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