Carbonization furnace waste discharge circulating combustion system and waste discharge circulating combustion method thereof

Abstract

The invention relates to the technical field of high-temperature carbonization furnaces, in particular to a carbonization furnace waste discharge circulating combustion system and a waste discharge circulating combustion method.The carbonization furnace waste discharge circulating combustion system comprises a carbonization furnace, a tail gas collector and a tail gas circulating pipeline system, the carbonization furnace comprises a reaction inner container and a combustion furnace, and a combustion chamber in the combustion furnace and the reaction inner container are independent chambers; a plurality of gas supply connectors are arranged in the middle of the combustion furnace and used for providing natural gas for the combustion chamber for combustion and heat supply, the tail gas circulating pipeline system comprises a tail gas discharging pipeline, a filter and a backflow pipeline, and a plurality of tail gas connectors are arranged on the surface of the combustion furnace. A plurality of first shunting pipelines are arranged in the middle of the backflow pipeline and are connected with the tail gas connector, so that combustible parts in natural gas and tail gas are mixed and supplied to the combustion chamber for combustion, the waste discharge energy utilization rate of the carbonization furnace is increased, meanwhile, the waste discharge component heterogeneity of the carbonization furnace is reduced, the waste discharge component of the carbonization furnace is further optimized, and the energy consumption of the carbonization furnace is reduced. And the discharge of the carbonization furnace is cleaner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature carbonization furnace, in particular to a carbonization furnace exhaust recycling combustion system and an exhaust recycling combustion method thereof. BACKGROUND

[0002] The carbonization furnace is a key equipment in the production process of carbon fiber, which is mainly used for carbonization treatment of pre-oxidized yarn. Its heating mode supports electric heating or gas heating, and the temperature coverage range is wide (such as 0-500℃, RT-1050℃, RT-1800℃, etc.). The carbonization furnace usually includes a shell, a heating system, a conveying device and a temperature control module.

[0003] In the production process of graphite products, the existing treatment method for high-component volatile flue gas in the high-temperature carbonization furnace is to use an external incinerator for secondary combustion and then discharge it into the atmosphere. Since there are combustible components inside, it will not only affect air quality, but also increase the cost of gas for the incinerator. Therefore, in view of the current situation, it is urgent to develop a carbonization furnace exhaust recycling combustion system and an exhaust recycling combustion method thereof to meet the needs of actual use. SUMMARY

[0004] The present application aims to provide a carbonization furnace exhaust recycling combustion system and an exhaust recycling combustion method thereof to solve the above-mentioned defects.

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0006] A carbonization furnace exhaust recycling combustion system, comprising a carbonization furnace, a tail gas collector and a tail gas recycling pipeline system, the carbonization furnace comprising a reaction inner container and a combustion furnace, the combustion furnace being wrapped on the surface of the reaction inner container, and the combustion chamber inside the combustion furnace and the reaction inner container being independent chambers, a plurality of gas supply interfaces being provided in the middle of the combustion furnace, the gas supply interfaces being used to provide natural gas for the combustion chamber to burn and provide heat, the tail gas collector being provided at the end of the combustion furnace and being in conductive structure with the reaction inner container, the tail gas recycling pipeline system comprising a tail gas delivery pipeline, a filter and a return pipeline, one end of the tail gas delivery pipeline being connected and conducted with the tail gas collector, the other end of the tail gas delivery pipeline being connected and conducted with the return pipeline through the filter, a plurality of tail gas interfaces being provided on the surface of the combustion furnace, and a plurality of first shunt pipelines being provided in the middle of the return pipeline and connected with the tail gas interfaces.

[0007] As a further scheme in the above description, the carbonization furnace comprises a preheating section and a pre-carbonization section, the preheating section and the pre-carbonization section are composed of reaction inner cans and combustion furnaces, the reaction inner cans of the preheating section and the pre-carbonization section are connected in a head-to-tail manner, the tail gas collectors are arranged at a section away from the connection of the reaction inner cans of the preheating section and the pre-carbonization section, the tail gas interfaces are arranged in the pre-carbonization section, and the backflow pipeline is connected to the tail gas interfaces of the pre-carbonization section through the first branch pipelines.

[0008] As a further scheme in the above description, two tail gas delivery pipelines are arranged, the tail gas delivery pipelines are connected to the tail gas collectors of the preheating section and the pre-carbonization section respectively, and the other ends of the tail gas delivery pipelines are connected to the backflow pipeline through the current collectors.

[0009] As a further scheme in the above description, the current collector is internally provided with control valves and variable frequency blowers, the control valves are used for controlling the closing of the tail gas delivery pipelines of the preheating section and the pre-carbonization section respectively, and the variable frequency blowers are used for controlling the delivery of the tail gas delivery pipelines of the preheating section and the pre-carbonization section respectively.

[0010] As a further scheme in the above description, the preheating air pipeline is further arranged, the combustion furnace of the pre-carbonization section is internally provided with air interfaces, the preheating air pipeline is internally provided with second branch pipelines at one end close to the pre-carbonization section, the second branch pipelines are connected to the air interfaces, and the preheating air pipeline is connected to the combustion chamber of the pre-carbonization section through the second branch pipelines.

[0011] As a further scheme in the above description, the tail gas collector is further provided with a pressure gauge and a concentration meter.

[0012] A waste discharge and recycling combustion method based on the waste discharge and recycling combustion system of the carbonization furnace, comprising the following steps:

[0013] Step one, equipment initialization, external gas supply pipelines are used to supply gas to the combustion chambers of the carbonization furnace and burn the reaction inner cans, and the materials in the reaction inner cans are heated to obtain combustible tail gas;

[0014] Step two, tail gas quantitative collection, a pressure gauge and a concentration meter arranged in the tail gas collector are used to collect the pressure and concentration parameters of the combustible tail gas, the pressure and concentration parameters of the combustible tail gas are compared with the set threshold value, and the closing of the control valve is driven and controlled;

[0015] Step three, tail gas backflow supply, when the pressure and concentration parameters of the combustible tail gas are greater than the set threshold value, the combustible tail gas flows through the filter and the current collector to the tail gas interfaces of the combustion furnace through the backflow pipeline, and the combustible tail gas is mixed with natural gas in the combustion chamber for combustion.

[0016] In the above description, as a further scheme, in step three, the preheated air can be injected into the air interface of the combustion furnace through the preheated air pipeline and the second shunt pipeline respectively, and the combustible tail gas and the preheated air are mixed and combusted in the combustion chamber.

[0017] In the above description, as a further scheme, when the proportion of the combustible tail gas is greater than that of the natural gas in step three, the flow and pressure of the combustible tail gas in the return pipeline are controlled by the control valve and the variable frequency fan of the flow combiner.

[0018] Compared with the prior art, the beneficial effects of the present application are: through the conductive structure of the tail gas collector and the reaction liner, the combustible tail gas is collected and conducted to the tail gas circulation pipeline system according to the pressure and concentration value of the combustible tail gas and other parameter conditions, the combustible part of the tail gas is provided to the combustion chamber of the combustion furnace through the filter and the return pipeline, the natural gas and the combustible part of the tail gas are mixed and supplied to the combustion chamber for combustion, the utilization rate of the exhaust energy of the carbonization furnace is improved, the exhaust composition of the carbonization furnace is reduced, the exhaust composition of the carbonization furnace is further optimized, and the exhaust of the carbonization furnace is cleaner. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 The structure diagram of the exhaust circulation combustion system of the carbonization furnace described in the present embodiment is shown in the figure.

[0020] Fig. 2 The principle diagram of the exhaust circulation combustion system of the carbonization furnace described in the present embodiment is shown in the figure.

[0021] In the figure: 1 - carbonization furnace, 11 - preheating section, 111 - tail gas interface, 112 - air interface, 12 - pre-carbonization section, 3 - tail gas collector, 31 - pressure gauge, 32 - concentration meter, 5 - tail gas circulation pipeline system, 51 - tail gas delivery pipeline, 52 - filter, 53 - flow combiner, 531 - control valve, 532 - variable frequency fan, 54 - return pipeline, 541 - first shunt pipeline, 6 - preheated air pipeline, 61 - second shunt pipeline, 7 - gas supply interface, 8 - reaction liner, 9 - combustion furnace, 91 - combustion chamber. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0023] In the present embodiment, please refer to Figs. 1-2A carbonization furnace 1 exhaust gas circulating combustion system, comprising a carbonization furnace 1, an exhaust gas collector 3 and an exhaust gas circulating pipeline system 5, the carbonization furnace 1 comprises a reaction inner container 8 and a combustion furnace 9, the combustion furnace 9 is arranged on the surface of the reaction inner container 8, and the combustion chamber 91 in the combustion furnace 9 is a chamber independent of the reaction inner container 8, a plurality of gas supply interfaces 7 are arranged in the middle of the combustion furnace 9, the gas supply interfaces 7 are used to provide natural gas for the combustion chamber 91 to burn and provide heat, the exhaust gas collector 3 is arranged at the end of the combustion furnace 9, and the exhaust gas collector 3 is in a conductive structure with the reaction inner container 8, the exhaust gas circulating pipeline system 5 comprises an exhaust gas delivery pipeline 51, a filter 52 and a return pipeline 54, one end of the exhaust gas delivery pipeline 51 is connected in conduction with the exhaust gas collector 3, the other end of the exhaust gas delivery pipeline 51 is connected in conduction with the return pipeline 54 through the filter 52, a plurality of exhaust gas interfaces 111 are arranged on the surface of the combustion furnace 9, and a plurality of first shunt pipelines 541 are arranged in the middle of the return pipeline 54 and connected with the exhaust gas interfaces 111.

[0024] The exhaust gas collector 3 is in a conductive structure with the reaction inner container 8, the combustible exhaust gas is collected, and the exhaust gas is conducted to the exhaust gas circulating pipeline system 5 according to the pressure and concentration value and other parameter conditions of the combustible exhaust gas, the combustible part in the exhaust gas is provided to the combustion chamber 91 of the combustion furnace 9 through the return pipeline 54 through the filter 52 and the return pipeline 54, the natural gas is mixed with the combustible part in the exhaust gas and supplied to the combustion chamber 91 for combustion, the exhaust energy utilization rate of the carbonization furnace 1 is improved, the exhaust component complexity of the carbonization furnace 1 is reduced, the exhaust component of the carbonization furnace 1 is further optimized, and the exhaust of the carbonization furnace 1 is cleaner.

[0025] In a further scheme, the carbonization furnace 1 comprises a preheating section 11 and a pre-carbonization section 12, the preheating section 11 and the pre-carbonization section 12 are composed of the reaction inner container 8 and the combustion furnace 9, the reaction inner containers 8 of the preheating section 11 and the pre-carbonization section 12 are connected in series, the exhaust gas collectors 3 are arranged at a section away from the connection of the reaction inner containers 8 of the preheating section 11 and the pre-carbonization section 12, the plurality of exhaust gas interfaces 111 are arranged in the pre-carbonization section 12, and the return pipeline 54 is connected in conduction with the exhaust gas interfaces 111 of the pre-carbonization section 12 through the plurality of first shunt pipelines 541.

[0026] Specifically, the exhaust gas delivery pipeline 51 is provided with two exhaust gas delivery pipelines 51, the two exhaust gas delivery pipelines 51 are connected with the exhaust gas collectors 3 of the preheating section 11 and the pre-carbonization section 12 respectively, and the other ends of the two exhaust gas delivery pipelines 51 are connected in conduction with the return pipeline 54 through the current combiner 53.

[0027] The tail gas of the preheating section 11 and the pre-carbonization section 12 is sent to the pre-carbonization section 12 through two tail gas exhaust and delivery pipelines 51. Since the required reaction temperature in the preheating section 11 is lower than that in the pre-carbonization section 12, the required fuel supply in the pre-carbonization section 12 is more than that in the preheating section 11 in actual working conditions. Therefore, the tail gas of the preheating section 11 and the pre-carbonization section 12 is sent to the pre-carbonization section 12 through two tail gas exhaust and delivery pipelines 51, which can further reasonably optimize the distribution of combustible tail gas. In addition, the generation rate of combustible tail gas in the preheating section 11 and the pre-carbonization section 12 is relatively slow. Therefore, the tail gas of the preheating section 11 and the pre-carbonization section 12 is sent to the pre-carbonization section 12 through two tail gas exhaust and delivery pipelines 51, which can improve the collection and delivery efficiency of combustible tail gas.

[0028] In the above description, as a further scheme, the inside of the flow collector 53 is further provided with a plurality of control valves 531 and variable frequency fans 532. The control valves 531 are respectively used to control the closing of the tail gas exhaust and delivery pipelines 51 of the preheating section 11 and the pre-carbonization section 12. The variable frequency fans 532 are respectively used to control the delivery of the tail gas exhaust and delivery pipelines 51 of the preheating section 11 and the pre-carbonization section 12. The tail gas collector 3 is further provided with a pressure gauge 31 and a concentration meter 32.

[0029] In a further scheme, the exhaust gas circulating combustion system of the carbonization furnace 1 further comprises a preheating air pipeline 6. The combustion furnace 9 of the pre-carbonization section 12 is provided with a plurality of air interfaces 112 in the middle. The preheating air pipeline 6 is provided with a plurality of second branch pipelines 61 near one end of the pre-carbonization section 12. The plurality of second branch pipelines 61 are connected to the plurality of air interfaces 112. The preheating air pipeline 6 is connected to the combustion chamber 91 of the pre-carbonization section 12 through the second branch pipelines 61.

[0030] The preheating air pipeline 6 can provide heated air to the combustion furnace 9 of the pre-carbonization section 12. In the mixed reaction of air, natural gas and combustible tail gas, the mixed ignition environment temperature of air, natural gas and combustible tail gas in a certain higher threshold can improve the efficiency of mixed combustion and the success rate of mixed ignition.

[0031] Specifically, based on the above-mentioned exhaust gas circulating combustion system of the carbonization furnace 1, an exhaust gas circulating combustion method comprises the following steps:

[0032] Step one, device initialization, the fuel gas is supplied to the combustion chamber 91 of the carbonization furnace 1 through the external fuel gas supply pipeline and is burned to heat the reaction inner container 8. The material in the reaction inner container 8 is heated and reacted to obtain combustible tail gas;

[0033] Step two, tail gas quantitative collection, through the pressure table 31 and the concentration meter 32 arranged in the tail gas collector 3, the pressure and concentration parameter information of the combustible tail gas are collected, and the pressure and concentration parameter of the combustible tail gas are compared with the set threshold value, so as to drive the control valve 531 to be closed;

[0034] Step three, tail gas reflux supply, when the pressure and concentration parameter of the combustible tail gas are greater than the set threshold value, the tail gas delivery pipe delivers the combustible tail gas flow through the filter 52 and the flow collector 53 to the tail gas interface 111 of the combustion furnace 9 through the reflux pipeline 54, and the combustible tail gas is mixed and combusted with the natural gas in the combustion chamber 91.

[0035] In a further scheme, in step three, the preheated air pipeline 6 can inject preheated air into the air interface 112 of the combustion furnace 9 through the second shunt pipeline 61, and the combustible tail gas, the natural gas and the preheated air are mixed and combusted in the combustion chamber 91, and when the proportion of the combustible tail gas is greater than that of the natural gas in step three, the flow collector 53 controls the flow and pressure of the combustible tail gas in the reflux pipeline 54 through the control valve 531 and the variable frequency fan 532.

[0036] The gas measuring elements such as the pressure table 31 and the concentration meter 32 can timely feed back the supply pressure, concentration and flow size and other parameters of the combustible tail gas, so that the mixing ratio among the combustible tail gas, the natural gas and the air is timely controlled and adjusted through the carbonization furnace 1 exhaust gas circulating combustion system, and the carbonization furnace 1 is in a reasonable mixed combustion mode.

[0037] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or replacements can be made without departing from the concept of the present application, and all of them should be regarded as the protection scope of the present application.

Claims

1. A waste gas recycling combustion system for a carbonization furnace, characterized in that, include: A carbonization furnace, comprising a reaction liner and a combustion furnace, wherein the combustion furnace is disposed on the surface of the reaction liner and the combustion chamber inside the combustion furnace is an independent chamber from the reaction liner, and the middle part of the combustion furnace is provided with several gas supply interfaces for supplying natural gas to the combustion chamber for combustion and heating. A tail gas collector is provided at the end of the combustion furnace, and the tail gas collector is connected to the reaction liner. The exhaust gas recirculation pipeline system includes an exhaust gas delivery pipeline, a filter, and a return pipeline. One end of the exhaust gas delivery pipeline is connected to the exhaust gas collector, and the other end of the exhaust gas delivery pipeline is connected to the return pipeline through the filter. The surface of the combustion furnace is provided with several exhaust gas interfaces, and the middle of the return pipeline is provided with several first diversion pipelines connected to the exhaust gas interfaces.

2. The carbonization furnace waste gas recycling combustion system according to claim 1, characterized in that: The carbonization furnace includes a preheating section and a precarbonization section, which are composed of a reaction liner and a combustion furnace. The reaction liners of the preheating section and the precarbonization section are connected end to end. The exhaust gas collectors are all located in the section of the preheating section and the precarbonization section away from the connection point of the reaction liner. Several exhaust gas ports are opened in the precarbonization section. The return pipe is connected to the exhaust gas ports of the precarbonization section through several first diversion pipes.

3. The carbonization furnace waste gas recycling combustion system according to claim 2, characterized in that: Two exhaust gas pipelines are provided. The two exhaust gas pipelines are connected to the exhaust gas collectors of the preheating section and the precarbonization section, respectively. The other end of each of the two exhaust gas pipelines is connected to the return pipeline through a manifold.

4. The carbonization furnace waste gas recycling combustion system according to claim 3, characterized in that: The manifold is also equipped with several control valves and a variable frequency fan. The control valves are used to control the closing of the exhaust gas pipelines of the preheating section and the precarbonization section, respectively, and the variable frequency fan is used to control the delivery of the exhaust gas pipelines of the preheating section and the precarbonization section.

5. The carbonization furnace waste gas recycling combustion system according to claim 2, characterized in that: It also includes a preheating air duct. The combustion furnace of the pre-carbonization section has several air interfaces in the middle. The preheating air duct has several second diversion pipes at one end near the pre-carbonization section. The several second diversion pipes are connected to the several air interfaces. The preheating air duct is connected to the combustion chamber of the pre-carbonization section through the second diversion pipes.

6. A carbonization furnace waste gas recycling combustion system according to any one of claims 1-5, characterized in that: The exhaust gas collector is also equipped with a pressure gauge and a concentration meter.

7. A waste recycling combustion method, characterized in that: A carbonization furnace waste gas recycling combustion system according to any one of claims 1-6 includes the following steps: Step 1: Equipment initialization. Gas is supplied to the combustion chamber of the carbonization furnace through the external gas supply pipeline and burned to heat the reaction tank. The material in the reaction tank is heated and reacted to produce combustible exhaust gas. Step 2: Quantitative collection of exhaust gas. The pressure and concentration parameters of combustible exhaust gas are collected by the pressure gauge and concentration meter installed in the exhaust gas collector. The pressure and concentration parameters of combustible exhaust gas are compared with the set threshold to drive the control valve to close. Step 3, exhaust gas recirculation supply: When the pressure and concentration parameters of the combustible exhaust gas are greater than the set threshold, the exhaust gas discharge pipe will send the combustible exhaust gas through the filter and manifold to the exhaust gas interface of the combustion furnace through the recirculation pipe. The combustible exhaust gas and natural gas will be mixed and burned in the combustion chamber.

8. The waste recycling combustion method according to claim 7, characterized in that: In step three, preheated air can be injected into the air interface of the combustion furnace through the preheated air pipe and the second diversion pipe. The combustible exhaust gas and natural gas are mixed and burned with the preheated air in the combustion chamber.

9. The waste recycling combustion method according to claim 7, characterized in that: In step three, when the proportion of combustible exhaust gas is greater than the natural gas mixing ratio, the manifold controls the flow rate and pressure of combustible exhaust gas in the return pipeline through the control valve and the variable frequency fan.

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