Combustion method and system for a ceramic roller hearth kiln for hydrogen-ammonia fusion

Abstract

The application provides a combustion method and system for a ceramic roller kiln for hydrogen ammonia fusion, and relates to the technical field of combustion. The method comprises the following steps: S1: a liquid ammonia storage device stores liquid ammonia and prevents leakage; S2: a conversion pressure reduction device is converted into ammonia gas; S3: a liquid ammonia hydrogen production device decomposes liquid ammonia into H2 and N2; S4: a gas mixing device adds first mixed gas to the ammonia gas to obtain second mixed gas; S5: the second mixed gas is introduced into the ceramic roller kiln for combustion; and S6: a tail gas treatment device adopts a first tail gas treatment method and / or a second tail gas treatment method to treat NO x X and the like in the ceramic roller kiln. The application uses mixed gas as fuel in the combustion firing process of the ceramic roller kiln, can decompose liquid ammonia to obtain hydrogen, makes the whole combustion firing process stable and controllable, adopts multiple tail gas treatment methods to treat the generated NO x X and the like, so as to reduce the emission amount of harmful substances in the tail gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combustion, in particular to a combustion method and system for a ceramic roller kiln for hydrogen-ammonia fusion. BACKGROUND

[0002] The heating furnace kiln is a device made of refractory materials to sinter products, which is essential in the production of ceramics, cement, steel, non-ferrous metals and other materials, and is a key equipment for large-scale raw material product fuel combustion and high-temperature heating or sintering. At present, the fuel for the building ceramic industry is mainly natural gas, and a small part of the area still uses water gas. The sustainable development of building ceramics is facing severe challenges. Hydrogen energy is a kind of secondary energy with abundant sources, green and low carbon, and wide application, which can accelerate the low-carbonization of the fields of industry, building and transportation.

[0003] Hydrogen and ammonia can also be used as new generation fuels for furnace kilns in the building ceramic sintering process. However, hydrogen has very high activity and burns violently, and there are many application barriers in transportation, storage, safety and cost. Ammonia has low activity, high ignition temperature, and extremely unstable combustion, which is easy to extinguish, and the existing burner nozzle is not suitable for ammonia as fuel, and a separate burner device needs to be developed. SUMMARY

[0004] The purpose of the present application is to provide a combustion method and system for a ceramic roller kiln for hydrogen-ammonia fusion, which can decompose liquid ammonia to produce hydrogen, and use mixed gas containing hydrogen and ammonia as fuel in the combustion and sintering process of the ceramic roller kiln. Without improving the burner equipment, the whole combustion and sintering process can be stable and controllable, and various tail gas treatment methods can be used to treat the generated NOx tail gas, thereby reducing the emission of harmful substances in the tail gas and meeting the requirements of environmental protection and low emission. x

[0005] The first aspect of the present application provides a combustion method for a ceramic roller kiln for hydrogen-ammonia fusion, comprising the following steps:

[0006] S1: The liquid ammonia storage device stores liquid ammonia and prevents liquid ammonia leakage, and the liquid ammonia is respectively delivered to the conversion pressure reducing device and the liquid ammonia hydrogen production device;

[0007] S2: The conversion pressure reducing device detects the first pressure value of the liquid ammonia in the first step, so that the liquid ammonia is converted into ammonia gas after pressure reduction, and the ammonia gas is transmitted to the liquid ammonia hydrogen production device;

[0008] ​S3: the liquid ammonia hydrogen production device decomposes the liquid ammonia treated in the second step into H2 and N2 under the action of the first catalyst, wherein the temperature range is 800-850 DEG C, the component content of H2:N2 is 3:1, a first mixed gas is obtained, the first mixed gas comprises H2 and N2, and the first mixed gas is transported to the gas mixing device;

[0009] S4: the gas mixing device adds the first mixed gas in the third step to the ammonia gas to obtain a second mixed gas, a second pressure value of the second mixed gas is regulated, and then the second mixed gas is transported into the ceramic roller kiln;

[0010] S5: the ceramic roller kiln is provided with a burner, the burner is connected to the mixed gas for sufficient combustion, air is supplied to maintain the firing process, tail gas is generated in the firing process, the tail gas comprises NO x ;

[0011] S6: the tail gas treatment device adopts a first tail gas treatment mode and / or a second tail gas treatment mode to treat NO x in the ceramic roller kiln.

[0012] In a possible embodiment of the present application, the first tail gas treatment mode in S6 is that when the temperature range of flue gas in the ceramic roller kiln is 850-1100 DEG C, the tail gas treatment device adds ammonia gas into the ceramic roller kiln to convert part of NO x into N2.

[0013] In a possible embodiment of the present application, the second tail gas treatment mode in S6 is that when the temperature range of flue gas in the ceramic roller kiln is 300-500 DEG C, the tail gas treatment device adds ammonia gas to treat NO x under the action of a second catalyst through a denitration device.

[0014] In a possible embodiment of the present application, S7 is further included, a gas monitoring device monitors the gas content component of the tail gas and the flue gas in the ceramic roller kiln, and the amount of ammonia gas added in S6 is regulated.

[0015] In a possible embodiment of the present application, S8 is further included, a data integration device collects and analyzes data, the data includes temperature, pressure, gas component and gas content component, and the data forms a visual chart result for feedback.

[0016] In a possible embodiment of the present application, the second pressure value of the second mixed gas in S4 ranges from 0.1 to 0.2 MPa.

[0017] The second aspect of the present application provides a system for a combustion method of a hydrogen-ammonia hybrid ceramic roller kiln, comprising the combustion method of the hydrogen-ammonia hybrid ceramic roller kiln in any one of the above embodiments, the system for the combustion method of the hydrogen-ammonia hybrid ceramic roller kiln further comprising a liquid ammonia storage device, a conversion pressure reduction device, a liquid ammonia hydrogen production device, a gas mixing device, and a tail gas treatment device.

[0018] In a possible embodiment of the present application, the liquid ammonia storage device comprises a liquid ammonia storage tank and an ammonia gas leakage alarm, the ammonia gas leakage alarm being connected to the liquid ammonia storage tank and monitoring the liquid ammonia leakage state of the liquid ammonia storage tank.

[0019] In a possible embodiment of the present application, the conversion pressure reduction device comprises a liquid ammonia pressure regulating tank and an ammonia gas pressure detection gauge, the liquid ammonia pressure regulating tank being connected to the ammonia gas pressure detection gauge through a U-shaped tube assembly.

[0020] In a possible embodiment of the present application, the liquid ammonia hydrogen production device comprises a heat exchanger, a decomposition furnace, a cooler, and a gas controller, the heat exchanger being connected to the decomposition furnace for decomposing liquid ammonia, the heat exchanger being cooled and mixed through the cooler, and the gas controller regulating gas through a gas storage tank.

[0021] In a possible embodiment of the present application, the gas mixing device comprises a burner for combustion and a gas pipeline, the gas pipeline being connected to the burner.

[0022] In a possible embodiment of the present application, the tail gas treatment device comprises a first nozzle and / or a denitration device installed in the ceramic roller kiln.

[0023] In a possible embodiment of the present application, the ceramic roller kiln is provided with a flue gas pipeline, and the denitration device is installed in the flue gas pipeline.

[0024] In a possible embodiment of the present application, the denitration device comprises a honeycomb ceramic provided with a second catalyst and a second nozzle, the second nozzle being arranged in the honeycomb ceramic, and the second catalyst being a vanadium-based catalyst.

[0025] In a possible embodiment of the present application, a gas monitoring device is further included, the gas monitoring device comprising a sensor and a gas detector, the sensor being connected to the gas detector and being used to detect the content of a gas component, an alarm being issued when the content of the gas component exceeds a preset value, the content of the gas component including hydrogen, ammonia, and NOx. x .

[0026] In a possible embodiment of the present application, a data integration device is further included, which collects and analyzes data and forms visual chart feedback results, the data including temperature, pressure and gas component content.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] (1) The present application can decompose liquid ammonia to produce hydrogen gas. Since pure hydrogen gas or pure ammonia gas as fuel is difficult to control and unstable, etc., mixed gas composed of hydrogen gas and ammonia gas is used as fuel in the combustion firing process of the ceramic roller kiln, without improving the burner equipment, the entire combustion firing process can be stable and controllable, thereby reducing the fuel use conditions and applying it to the fuel combustion of the ceramic roller kiln.

[0029] (2) The present application adopts various tail gas treatment methods to treat the generated NO x x tail gas in the combustion firing process of the ceramic roller kiln, thereby reducing the emission of harmful substances in the tail gas and meeting the requirements of environmental protection and low emission. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 Flowchart of the combustion method for the hydrogen-ammonia fusion ceramic roller kiln provided in some embodiments of the present application Figure One ;

[0032] Figure 2 Flowchart of the combustion method for the hydrogen-ammonia fusion ceramic roller kiln provided in some embodiments of the present application Figure Two ;

[0033] Figure 3 Flowchart of the combustion method for the hydrogen-ammonia fusion ceramic roller kiln provided in some embodiments of the present application Figure Three . DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0036] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] Some embodiments of the present application will be described in detail with reference to the drawings. The following examples and features in the examples can be combined with each other in the case of no conflict.

[0041] Example 1

[0042] The embodiments of the present application provide a combustion method for a ceramic roller kiln for hydrogen ammonia fusion, which can also be applied to a ceramic tunnel kiln, a cement continuous kiln and a metal continuous heating furnace kiln, as shown in Figure 1 and Figure 2 The combustion method comprises the following steps:

[0043] S1: The liquid ammonia storage device stores liquid ammonia and prevents liquid ammonia leakage, and delivers the liquid ammonia to the conversion pressure reducing device and the liquid ammonia hydrogen production device, respectively.

[0044] Specifically, the liquid ammonia is stored by a storage tank, which is provided with an ammonia gas leakage alarm device, an air extraction device and a spraying device. The ammonia gas leakage alarm device gives an alarm to remind the staff to handle in time when ammonia gas leaks, and the air extraction device and the spraying device deal with the leaked ammonia gas to reduce the harm, so as to avoid personnel casualties caused by liquid ammonia leakage. After using the liquid ammonia, the liquid ammonia is delivered to the conversion pressure reducing device and the liquid ammonia hydrogen production device, respectively, through a T-shaped pipeline.

[0045] S2: The conversion pressure reducing device detects the first pressure value of the liquid ammonia in the first step and converts the liquid ammonia into ammonia gas after reducing the pressure, and then transmits the ammonia gas to the gas mixing device.

[0046] Specifically, the conversion pressure reducing device comprises a liquid ammonia pressure regulating tank and an ammonia gas pressure detection table. The liquid ammonia pressure regulating tank regulates the first pressure value within a preset pressure value range, and converts the liquid ammonia into ammonia gas after reducing the pressure. The ammonia gas pressure detection table is provided with a plurality of groups of U-shaped pipe assemblies and a plurality of groups of ammonia gas stop valves which are connected to each other, for controlling the inflow and outflow of liquid ammonia and ammonia gas in the conversion pressure reducing device, and transmitting the ammonia gas to the gas mixing device. Preferably, the first pressure value ranges from 0 to 2.5 MPa, and further preferably, the first pressure value ranges from 0 to 1.0 MPa, i.e. the pressure value of the ammonia gas transmitted to the gas mixing device is 0-1.0 MPa.

[0047] S3: The liquid ammonia hydrogen production device decomposes the liquid ammonia into H2 and N2 under the action of a first catalyst, wherein the temperature ranges from 800 to 850℃, the component content of H2:N2 is 3:1, a first mixed gas is obtained and delivered to the gas mixing device.

[0048] Specifically, the liquid ammonia in the liquid ammonia hydrogen production device first enters the decomposition furnace through the heat exchanger, and is decomposed into H2 and N2 under the action of the first catalyst in the decomposition furnace. The product after the decomposition is returned to the heat exchanger to mix with the ammonia gas and is cooled by the cooler to obtain the first mixed gas. Preferably, the temperature during the decomposition is in the range of 800-850℃, at which temperature part of the liquid ammonia is converted into ammonia gas due to the gasification. It should be noted that the content of the gas components of H2:N2 in the first mixed gas is 3:1, and the first mixed gas comprises H2 and N2.

[0049] S4: The gas mixing device adds the first mixed gas in the third step to the ammonia gas to obtain the second mixed gas, regulates the second pressure value of the second mixed gas, and then sends the second mixed gas into the ceramic roller kiln through the conveying pipeline.

[0050] Specifically, the gas mixing device adds the first mixed gas to the ammonia gas to obtain the second mixed gas as fuel, at this time the pressure value of the first mixed gas is in the range of 0-0.5MPa, the second pressure value of the second mixed gas is regulated, and then the second mixed gas is sent into the ceramic roller kiln through the conveying pipeline. The second mixed gas is introduced into the kiln body of the ceramic roller kiln under the action of the burner for sufficient combustion, and air is supplied to maintain the firing process. Correspondingly, the gas conveying pipeline is provided with a low pressure limit position alarm device to monitor the pressure value in the pipeline to prevent insufficient pressure in the pipeline, thereby affecting the combustion state of the burner in the ceramic roller kiln.

[0051] The second mixed gas comprises H2, N2 and ammonia gas, in other words, the second mixed gas as fuel does not need to separate and treat the ammonia gas therein, nor does it need to install a dryer with molecular sieve as the adsorbent to dry the mixed gas. The process in the combustion process is optimized. The ammonia gas and the first mixed gas enter the gas storage cabinet in a set proportion through the gas flow control unit to be uniformly mixed to obtain the second mixed gas. The gas storage cabinet is connected with a gas controller and a pressure controller. The gas controller is used to control the gas flow, and the pressure controller regulates the pressure of the mixed gas to be the second pressure value. Correspondingly, the second pressure value is a range pressure value, and the second mixed gas can be used as fuel for combustion.

[0052] Preferably, the second pressure value of the second mixed gas is in the range of 0.1-0.2MPa.

[0053] S5: The ceramic roller kiln is provided with a burner, the burner introduces the second mixed gas for combustion, and air is supplied to maintain the firing process. Tail gas is generated during the firing process, and the tail gas comprises NOx. x , wherein NOx refers to nitrogen oxides. x

[0054] ​Among them, the ceramic roller kiln uses a mixture of hydrogen, ammonia and other gases as fuel during the combustion and firing process, and can decompose liquid ammonia to produce hydrogen. The entire combustion and firing process can be stable and controllable without modifying the burner equipment.

[0055] It should be noted that the burner can be a commercially available conventional natural gas burner.

[0056] S6: The exhaust gas treatment device uses a first exhaust gas treatment method and / or a second exhaust gas treatment method to treat NO in the ceramic roller kiln. x .

[0057] Specifically, refer to Figure 3 As shown, the exhaust gas treatment device uses the first exhaust gas treatment method to treat NO in the exhaust gas from the ceramic roller kiln. x Alternatively, a secondary exhaust gas treatment method can be used to treat the NO in the exhaust gas from the ceramic roller kiln. x Treatment can be carried out, or both the first and second tail gas treatment methods can be used simultaneously to treat the NO in the tail gas from the ceramic roller kiln. x Process it.

[0058] The first exhaust gas treatment method employs selective non-catalytic reduction (SNCR) technology. A first nozzle is installed above the kiln roof inside the ceramic roller kiln. When the temperature of the flue gas inside the ceramic roller kiln is in the range of 850-1100℃, the first nozzle is used to deliver ammonia. The exhaust gas treatment device introduces a preset amount of ammonia into the ceramic roller kiln through the first nozzle. At this time, the ammonia easily removes NO from the flue gas in the furnace through the reducing atmosphere formed by the incomplete combustion of ammonia and the oxygen-deficient combustion environment. x The reduction reaction will reduce some of the NO. x It is converted into N2, thereby partially treating the NO in the exhaust gas. x The effect of gases.

[0059] It should be noted that selective non-catalytic reduction (SNCR) technology, without the use of a catalyst, involves uniformly injecting an amino-based reducing agent such as ammonia or urea into a suitable location within the furnace (or circulating fluidized bed separator) of the flue gas. The reducing agent decomposes rapidly in the furnace, reacting with NO in the flue gas. x The technology that produces N2 and H2O through reaction without reacting significantly with ammonia in flue gas.

[0060] The second exhaust gas treatment method employs selective catalytic reduction (SCR) technology. Accordingly, a denitrification device is installed in the flue gas duct of the ceramic roller kiln. This device is equipped with honeycomb ceramic, which is filled with a second catalyst. The honeycomb ceramic also has a second nozzle for introducing ammonia. When the temperature of the flue gas inside the ceramic roller kiln is between 300-500℃, ammonia is introduced through the denitrification device under the action of the second catalyst to treat the NO in the exhaust gas.x ammonia as a reducing agent to reduce NOx in the combustion flue gas x to perform a reduction reaction, preferably, the second catalyst is a vanadium-based catalyst.

[0061] It should be noted that the selective catalytic reduction technology (SCR) refers to the use of a reducing agent (such as NH3, liquid ammonia, urea) to "selectively" react with NOx in the flue gas under the action of a catalyst to generate N2 and H2O. x

[0062] It should be noted that the chemical symbols expressed in this application are standard chemical element symbols, N2 is nitrogen, H2O is water, H2 is hydrogen, ammonia and liquid ammonia are different chemical states of NH3, ammonia is the gaseous state of NH3, liquid ammonia is the liquid state of NH3, and NOx is nitrogen oxide. x

[0063] In summary, the combustion method for the hydrogen-ammonia hybrid ceramic roller kiln can decompose liquid ammonia to produce hydrogen. Due to the problems of pure hydrogen or pure ammonia as fuel, such as difficult control and instability, hydrogen storage and transportation are difficult, while ammonia storage and transportation are relatively convenient, the storage and transportation cost is low, and the safety is better. Therefore, the method of using ammonia to produce hydrogen is used in the combustion process of the ceramic roller kiln, and a mixed gas composed of hydrogen, ammonia and other gases is used as fuel. Without improving the burner equipment, the entire combustion process can be stable and controllable, thereby reducing the fuel use conditions and applying it to the fuel combustion of the ceramic roller kiln.

[0064] In the combustion process of the ceramic roller kiln, a variety of tail gas treatment methods are used to treat the generated NOx tail gas, thereby reducing the emission of harmful substances in the tail gas and meeting the requirements of environmental protection and low emission.

[0065] Example 2

[0066] The embodiments of the present application provide another combustion method for a hydrogen-ammonia hybrid ceramic roller kiln, which can also be applied to ceramic tunnel kilns, cement continuous kilns and metal continuous heating furnace kilns. Referring to FIGS. 1 and 2, the combustion method comprises the following steps: Figure 1 and Figure 2

[0067] S1: The liquid ammonia storage device stores liquid ammonia and prevents liquid ammonia leakage, and delivers the liquid ammonia to the conversion pressure reduction device and the liquid ammonia hydrogen production device, respectively.

[0068] ​​​Specifically, the liquid ammonia is stored through the storage tank, and the ammonia gas leakage alarm device, the air extraction device and the spraying device are arranged, the ammonia gas leakage alarm device sends an alarm to remind the staff to handle in time when the ammonia gas leaks, at this time, the air extraction device and the spraying device deal with the leaked ammonia gas to reduce the harm, thereby avoiding the leakage of the liquid ammonia to cause casualties, and the liquid ammonia is respectively delivered to the conversion pressure reducing device and the liquid ammonia hydrogen production device.

[0069] S2: The conversion pressure reducing device detects the first pressure value of the liquid ammonia in the first step and converts the liquid ammonia into ammonia gas after reducing the pressure of the liquid ammonia, and transmits the ammonia gas to the gas mixing device.

[0070] Specifically, the conversion pressure reducing device comprises a liquid ammonia pressure regulating tank and an ammonia gas pressure detection table, the liquid ammonia pressure regulating tank regulates the pressure value of the liquid ammonia, and the liquid ammonia is converted into ammonia gas when the pressure value is controlled in the preset pressure value range and set as the first pressure value, the liquid ammonia is converted into ammonia gas after being reduced in pressure by the liquid ammonia pressure regulating tank, the liquid ammonia pressure regulating tank is connected with a plurality of U-shaped pipe assemblies in communication with each other, the ammonia gas pressure detection table is connected with a plurality of ammonia gas stop valves, and the ammonia gas pressure detection table is used to control the entry and exit of the ammonia gas in the conversion pressure reducing device, and the ammonia gas is transmitted to the gas mixing device.

[0071] S3: The liquid ammonia hydrogen production device decomposes the liquid ammonia into H2 and N2 under the action of the first catalyst, wherein the temperature range is 800-850℃, the component content of H2:N2 is 3:1, a first mixed gas is obtained and delivered to the gas mixing device.

[0072] Specifically, the liquid ammonia in the liquid ammonia hydrogen production device first enters the decomposition furnace through the heat exchanger and is decomposed into H2 and N2 under the action of the first catalyst in the decomposition furnace, the first catalyst is a nickel-based catalyst, the temperature range during the decomposition is 800-850℃, when the temperature during the decomposition is greater than 850℃, the reaction activity of the nickel-based catalyst will be affected, and the decomposition efficiency will be reduced, when the temperature during the decomposition is less than 800℃, the decomposition efficiency is relatively low, and the generation of H2 and N2 by the decomposition is affected. Part of the liquid ammonia under the temperature range of 800-850℃ is converted into ammonia gas due to the gasification, and the decomposition into H2 and N2 needs to be cooled due to the high temperature at this time, the product after the decomposition returns to the heat exchanger, is mixed with the ammonia gas and is cooled by the cooler, a first mixed gas is obtained, it should be noted that the gas component content of H2:N2 in the first mixed gas is 3:1, that is, the content component of H2 in the product of the liquid ammonia decomposition is 75%, the content component of N2 in the product of the liquid ammonia decomposition is 25%, the temperature range during the decomposition is 800-850℃, and the first mixed gas comprises H2 and N2.

[0073] S4: The gas mixing device adds the first mixed gas in the third step to the ammonia gas to obtain a second mixed gas, regulates a second pressure value of the second mixed gas, and then delivers the second mixed gas to the ceramic roller kiln through the delivery pipeline.

[0074] Specifically, the gas mixing device adds the first mixed gas to the ammonia gas to obtain the second mixed gas as the fuel, regulates the second pressure value of the second mixed gas, prevents the occurrence of insufficient pressure, thereby keeping the state of the second mixed gas stable and sustainable, then delivers the second mixed gas to the ceramic roller kiln through the delivery pipeline, and the second mixed gas is fully burned in the kiln body of the ceramic roller kiln under the action of the burner and with air distribution to maintain the firing process. Correspondingly, the gas delivery pipeline is provided with a low pressure limit position alarm device to monitor the pressure value in the pipeline to prevent insufficient pressure in the pipeline, thereby affecting the burning state of the burner in the ceramic roller kiln.

[0075] The second mixed gas includes H2, N2 and ammonia, in other words, the second mixed gas as the fuel does not need to separate and process the ammonia therein, nor does it need to install a dryer with molecular sieve as the adsorbent to dry the mixed gas. The process in the burning process is optimized, the second mixed gas is delivered to the gas storage tank, the gas storage tank is connected with a gas controller and a pressure controller, the gas controller is used to control the gas flow, and the pressure controller regulates the pressure of the mixed gas to be the second pressure value. Correspondingly, the second pressure value is a range pressure value, and the second mixed gas can be burned as fuel. Preferably, the second pressure value of the second mixed gas ranges from 0.1 to 0.2 MPa, and the range of the regulated second pressure value is to keep the state of the second mixed gas stable, which is beneficial to the mixing of the second mixed gas.

[0076] S5: The ceramic roller kiln is provided with a burner, the burner is supplied with the second mixed gas for burning, and tail gas is generated during the firing process. The tail gas includes NOx x , wherein NOx x refers to nitrogen oxides.

[0077] The second mixed gas mixed by hydrogen and ammonia is used as fuel during the firing process of the ceramic roller kiln, and the hydrogen is prepared by decomposing liquid ammonia. Without improving the burner equipment, the entire burning and firing process can be stable and controllable. Correspondingly, the burner fully burns the second mixed gas using a natural gas burner available on the market, and air is distributed to maintain the firing process, and tail gas is generated during the firing process.

[0078] S6: The tail gas treatment device adopts a first tail gas treatment method and a second tail gas treatment method to treat NOx x in the ceramic roller kiln.

[0079] Specifically, as shown in Figure 3 , the tail gas treatment device simultaneously adopts the first tail gas treatment method and the second tail gas treatment method to treat NOx x in the tail gas in the ceramic roller kiln.

[0080] The first tail gas treatment mode adopts selective non-catalytic reduction technology (SNCR), a first nozzle is installed above the kiln top in the ceramic roller kiln, when the temperature of the flue gas in the ceramic roller kiln ranges from 850-1100℃, the tail gas treatment device introduces a preset amount of ammonia into the ceramic roller kiln, at this time, part of the NO x is converted into N2, achieving the effect of partially treating NO x gas in the tail gas.

[0081] The second tail gas treatment mode adopts selective catalytic reduction technology (SCR), correspondingly, a denitration device is installed in the flue gas pipeline of the ceramic roller kiln, preferably, the denitration device is provided with a honeycomb ceramic, the honeycomb ceramic is filled with a second catalyst, and the honeycomb ceramic is also provided with a second nozzle, at this time, the second nozzle is used to add ammonia, when the temperature of the flue gas in the ceramic roller kiln ranges from 300-500℃, the denitration device adds ammonia to treat NO x in the tail gas under the action of the second catalyst, thereby reducing the NO x emission in the flue gas in the flue gas pipeline to less than 60ppm, preferably, the second catalyst is a vanadium-based catalyst.

[0082] The combustion method of the ceramic roller kiln for hydrogen-ammonia fusion further includes S7, a gas monitoring device monitors the gas content components of the tail gas and flue gas in the ceramic roller kiln, and adjusts the amount of ammonia added in S6.

[0083] Specifically, the gas monitoring device includes a sensor assembly and a gas detector, the sensor assembly is connected with the gas detector and is used for detecting the gas component content, and an alarm is sent when the gas component content exceeds a preset value, the gas component content includes hydrogen, ammonia and NO x , correspondingly, the sensor assembly and the gas detector are used for monitoring the gas component content in the process of treating the tail gas by the tail gas treatment device, so as to adjust the amount of ammonia added in the first tail gas treatment mode and / or the second tail gas treatment mode.

[0084] Preferably, the sensor assembly includes a trace ammonia leakage sensor and a high-temperature trace ammonia escape sensor, which are used for monitoring the gas component content in the tail gas and flue gas, further, the trace ammonia leakage sensor can realize real-time quantitative detection of ammonia concentration in sub-ppm and ppm levels with a response time accuracy of 1s, and further, the high-temperature trace ammonia escape sensor can realize real-time quantitative detection of ammonia concentration in sub-ppm and ppm levels with a time resolution of 1s.

[0085] Preferably, the gas detector can quantitatively detect the NO x concentration in a wide dynamic range, detect the ammonia and NO x content, and the detection accuracy of the gas detector for the NO x concentration in a wide dynamic range is in the ppb-ppm range.

[0086] Preferably, the gas monitoring device further comprises a hydrogen monitoring device, which monitors hydrogen, and uses optical fiber sensing to identify a response to hydrogen leakage and issue an alarm when the hydrogen content exceeds a preset threshold, thereby avoiding hydrogen leakage, enabling real-time online monitoring of hydrogen content, reminding staff to handle and maintain, and ensuring the safety of equipment and personnel.

[0087] The combustion method for the ceramic roller kiln for hydrogen-ammonia fusion further comprises S8, a data integration device collects and analyzes data, including temperature, pressure, gas composition and gas content components, and further including kiln body internal temperature data, gas content component data, pressure value and flue gas temperature, to realize data analysis and further control related equipment, and feedback the data in the form of visual chart results.

[0088] In summary, the combustion method for the ceramic roller kiln for hydrogen-ammonia fusion can decompose liquid ammonia to produce hydrogen, and use mixed gas composed of hydrogen, ammonia and the like as fuel during the combustion firing process of the ceramic roller kiln, which can make the entire combustion firing process stable and controllable, thereby reducing the fuel use conditions and enabling application in the fuel combustion of the ceramic roller kiln.

[0089] In the combustion firing process of the ceramic roller kiln, a plurality of tail gas treatment methods are used to treat the generated NO x and other tail gas, thereby reducing the emission of harmful substances in the tail gas and meeting the requirements of environmental protection and low emission, and the gas monitoring device and data integration device provided in the combustion firing process of the ceramic roller kiln can monitor the content of ammonia, hydrogen, NO x and other gas components, and issue an alarm when the preset value is exceeded to prevent gas leakage and harm personnel safety.

[0090] Example 3

[0091] On the basis of the embodiment 1 or the embodiment 2 of the present application, a system for the combustion method of the ceramic roller kiln for hydrogen-ammonia fusion is further provided, comprising a liquid ammonia storage device, a conversion pressure reduction device, a liquid ammonia hydrogen production device, a gas mixing device and a tail gas treatment device.

[0092] Specifically, the liquid ammonia storage device comprises a liquid ammonia storage tank, an ammonia gas leakage alarm, the ammonia gas leakage alarm is connected to the liquid ammonia storage tank and monitors the liquid ammonia leakage state of the liquid ammonia storage tank, and the liquid ammonia storage tank is connected to the outside through a T-shaped pipeline and supplies liquid ammonia to the outside. In other words, liquid ammonia is one of dangerous chemicals, and an emergency treatment method needs to be set up for treatment. When the ammonia gas leakage alarm issues an alarm, an air extraction device and a tap water spraying device are set up to treat the liquid ammonia at the leakage position of the liquid ammonia storage tank. Correspondingly, since the leaked liquid ammonia is prone to gasification and conversion into ammonia gas, the air extraction device is used for air extraction and ventilation, which is conducive to maintaining the circulation of air and discharging the ammonia gas accumulated at the leakage position, thereby reducing the harm of liquid ammonia leakage.

[0093] Specifically, the conversion and pressure reduction device comprises a liquid ammonia pressure regulating tank and an ammonia gas pressure detection gauge. The liquid ammonia pressure regulating tank regulates the first pressure value and controls it within a preset pressure value range. The liquid ammonia pressure regulating tank reduces the pressure value of the liquid ammonia and controls it within a preset pressure value range. Meanwhile, a plurality of groups of U-shaped pipe assemblies and a plurality of groups of ammonia gas shut-off valves are provided. Thus, the liquid ammonia pressure regulating tank is connected to a plurality of groups of U-shaped pipe assemblies, and is used to convert liquid ammonia into ammonia gas. The ammonia gas pressure detection gauge is connected to the ammonia gas shut-off valve and is used to control the entry and exit of ammonia gas in the conversion and pressure reduction device.

[0094] Specifically, the liquid ammonia hydrogen production device comprises a heat exchanger, a decomposition furnace, a cooler and a gas controller. The heat exchanger is connected to the decomposition furnace for decomposing liquid ammonia. The heat exchanger cools and mixes gas components through the cooler. The gas controller regulates the first mixed gas through a gas storage tank.

[0095] Specifically, the gas mixing device comprises a burner for sufficient combustion and a gas pipeline. The gas pipeline delivers the treated gas to the burner. Correspondingly, the delivered gas comprises the first mixed gas obtained by the liquid ammonia hydrogen production device and the ammonia gas obtained by the conversion and pressure reduction device, and the two gases are mixed to obtain the second mixed gas.

[0096] Specifically, the tail gas treatment device comprises a first nozzle and / or a denitration device installed in the ceramic roller kiln.

[0097] Preferably, the ceramic roller kiln is provided with a flue gas pipeline, and the denitration device is installed in the flue gas pipeline. Further, the denitration device comprises a honeycomb ceramic provided with a second catalyst and a second nozzle. The second nozzle is arranged on the honeycomb ceramic. Further, the second catalyst is a vanadium-based catalyst, i.e. the vanadium-based catalyst is filled in the honeycomb ceramic. Correspondingly, the second nozzle is installed on the honeycomb ceramic, and the second nozzle is used to deliver ammonia gas. Under the action of the vanadium-based catalyst, the ammonia gas reacts with NOx in the flue gas pipeline to achieve the effect of treating NOx in the tail gas. x x

[0098] ​​Specifically, the gas monitoring device is further included, the gas monitoring device includes a sensor assembly and a gas detector, the sensor assembly is connected with the gas detector and is used for detecting the gas component content, preferably, the sensor assembly includes a trace ammonia leakage sensor and a high-temperature trace ammonia escape sensor, which are used for monitoring the gas component content in the tail gas and the flue gas, further, the trace ammonia leakage sensor can realize real-time quantitative detection of sub-ppm and ppm level ammonia concentration with a response time accuracy of 1s, and further, the high-temperature trace ammonia escape sensor can realize real-time quantitative detection of sub-ppm and ppm level ammonia concentration with a time resolution of 1s, and an alarm is issued when the gas component content exceeds the preset value, and the gas component content includes hydrogen, ammonia and NO x .

[0099] Specifically, the data integration device is further included, the data integration device collects and analyzes data and forms a visual chart feedback result, the data includes temperature, pressure and gas component content, preferably, the data includes temperature field data, gas component data and pressure data in the ceramic roller kiln, and flue gas temperature and component data, and functions such as real-time regulation and feedback are performed according to the data results.

[0100] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0101] In all the examples shown and described herein, any specific value should be interpreted as merely exemplary and not as a limitation, therefore, other examples of the example embodiments can have different values.

[0102] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application.

Claims

1. A combustion method for a ceramic roller hearth kiln for hydrogen ammonia fusion, characterized by, The application relates to a hydrogen-ammonia fusion ceramic roller kiln and a combustion method thereof. The liquid ammonia storage device stores liquid ammonia and prevents liquid ammonia leakage, and the liquid ammonia is respectively delivered to a conversion pressure reduction device and a liquid ammonia hydrogen production device; The conversion pressure reduction device detects a first pressure value of the liquid ammonia, so that the liquid ammonia is converted into ammonia gas after being reduced in pressure, and the ammonia gas is transmitted to a gas mixing device, and the first pressure value is 0-2.5 MPa; The liquid ammonia hydrogen production device decomposes liquid ammonia into H2 and N2 under the action of a first catalyst, wherein the temperature ranges from 800 to 850 DEG C, the component content of H2:N2 is 3:1, a first mixed gas is obtained and delivered to the gas mixing device; The first mixed gas is mixed into the ammonia gas in the gas mixing device to obtain a second mixed gas, the second mixed gas comprises H2, N2 and ammonia gas, a second pressure value of the second mixed gas is regulated, and then the second mixed gas is delivered to a ceramic roller kiln, the second pressure value ranges from 0.1 MPa to 0.2 MPa, the ammonia gas and the first mixed gas enter a gas storage cabinet in a set proportion through a gas flow control unit and are uniformly mixed to obtain the second mixed gas; The ceramic roller kiln is connected with the second mixed gas for combustion, and tail gas is generated during the firing process, wherein the tail gas comprises NO x ; The tail gas treatment device adopts the first tail gas treatment mode and / or the second tail gas treatment mode to treat the NO in the ceramic roller kiln x .

2. The combustion method for a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 1, characterized by, The first tail gas treatment mode is that when the temperature of the flue gas in the ceramic roller kiln is in the range of 850-1100℃, the tail gas treatment device adds the ammonia gas to the ceramic roller kiln to convert NO x into N2; the second tail gas treatment mode is that when the temperature of the flue gas in the ceramic roller kiln is in the range of 300-500℃, the ammonia gas is added to treat NO x under the action of a second catalyst by a denitration device.

3. The combustion method for a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 1, characterized by, The application further comprises monitoring the gas content component of tail gas in the ceramic roller kiln and regulating the amount of ammonia gas added.

4. The firing method for a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 1, characterized in that, The application further comprises collecting and analyzing data to form a visual chart and feed back the results, wherein the data comprises temperature, pressure, gas component and gas content component.

5. A system for a combustion method of a ceramic roller hearth kiln for hydrogen ammonia fusion, characterized by, The application further comprises a combustion method for the hydrogen-ammonia fusion ceramic roller kiln according to any one of claims 1-4, and the combustion method further comprises: The liquid ammonia storage device comprises a liquid ammonia storage tank and an ammonia gas leakage alarm, the ammonia gas leakage alarm is connected to the liquid ammonia storage tank and monitors the liquid ammonia storage tank; The conversion pressure reduction device comprises a liquid ammonia pressure regulating tank and an ammonia gas pressure detection table, the liquid ammonia pressure regulating tank is connected to the ammonia gas pressure detection table through a U-shaped pipe assembly; The liquid ammonia hydrogen production device comprises a heat exchanger, a decomposition furnace, a cooler and a gas controller, the heat exchanger is connected to the decomposition furnace for decomposing liquid ammonia, the heat exchanger is connected to the cooler, and the gas controller is connected to a gas storage cabinet for regulating gas; The gas mixing device comprises a burner and a gas conveying pipeline, the gas conveying pipeline is connected to the burner; The tail gas treatment device comprises a first nozzle and / or a denitration device installed in the ceramic roller kiln.

6. The system for the combustion process of a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 5, characterized in that, The ceramic roller kiln is provided with a flue gas pipeline, and the denitration device is installed in the flue gas pipeline.

7. The system for the combustion process of a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 5, characterized by the fact that, The denitration device comprises a honeycomb ceramic provided with a second catalyst and a second nozzle, and the second nozzle is arranged on the honeycomb ceramic.

8. The system for the combustion process of a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 5, characterized by the fact that, Also included is a gas monitoring device, the gas monitoring device including a sensor and a gas detector, the sensor being connected to the gas detector, the gas component content including hydrogen, ammonia and NO exceeding a preset value sending an alarm x .

9. The system for the combustion process of a ceramic roller hearth kiln for hydrogen ammonia fusion according to claim 5, characterized by the fact that, The application further comprises a data integration device which collects and analyzes data and forms a visual chart.

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