Ammonia gas sampling device and method

Abstract

The invention provides an ammonia gas sampling device and method. The device comprises pretreatment equipment, sampling equipment and a controller, when the controller detects that parts in the pretreatment equipment and the sampling equipment reach corresponding preset temperatures, the sampling equipment is controlled to start a vacuum pump, so that flue gas flows through the pretreatment equipment, and sampling information is recorded; the pretreatment equipment is used for removing water vapor and particulate matters in the flue gas passing through the pretreatment equipment, so that the flue gas treated by the pretreatment equipment flows through the sampling equipment; an absorption liquid in a honeycomb glass corrosion device in the sampling equipment captures ammonia gas in the flue gas so as to meet the requirement of carrying out nitrogen stable isotope analysis on the ammonia gas in the flue gas. Ammonia nitrogen isotope source spectrums of different emission sources can be established subsequently, ammonia in the atmosphere can be traced precisely, and support is provided for atmosphere haze treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of air pollution prevention and control, and particularly to a sampling device and method for ammonia gas. Background Art

[0002] In order to remove nitrogen oxides NOx in industrial flue gas, selective catalytic denitrification technology (SCR) and non-selective catalytic denitrification technology (SNCR) are often used to denitrify the flue gas; when using the above technologies, urea or ammonia water is usually sprayed into the flue to generate NH3, and then NH3 and NOx undergo an oxidation-reduction reaction at high temperature to generate nitrogen gas for denitrification. In order to ensure the denitrification efficiency, an excessive amount of urea or ammonia water is often added, resulting in a large amount of NH3, that is, industrial ammonia escapes into the atmosphere with the tail gas. The escaped NH3 will react with gaseous sulfuric acid and nitric acid in the atmosphere to form ammonium sulfate and ammonium nitrate particles, causing the formation of haze.

[0003] The application of nitrogen stable isotope (δ 15 N) analysis technology combined with the isotope mixing model is an effective means to trace the source of atmospheric NH3, but the accuracy of its analysis is closely related to the selection of the δ 15 N eigenvalue of the emission source spectrum. Accurately measuring the δ 15 N eigenvalue of the escaped NH3 in the high-temperature and high-humidity flue gas of industrial emissions can provide scientific and technological support for the precise tracing of the source of air pollution. Summary of the Invention

[0004] In view of this, the embodiments of the present invention provide a sampling device and method for ammonia gas to solve the problem that the nitrogen isotope eigenvalue of NH3 in the high-temperature and high-humidity flue gas of existing industrial emissions cannot be accurately measured.

[0005] To achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0006] The embodiments of the present invention disclose a sampling device for ammonia gas, the device includes: a pretreatment device, a sampling device and a controller;

[0007] The pretreatment device is arranged on the flue, the pretreatment device is connected to the sampling device through a pipeline, and the inside of the sampling device is set as a honeycomb glass dissolver;

[0008] The controller is wirelessly connected to the pretreatment device and the sampling device respectively;

[0009] When the controller detects that the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, it controls the sampling device to turn on the vacuum pump, so that the flue gas flows through the pretreatment device, and records the sampling information;

[0010] The pretreatment device is used to remove water vapor and particulate matter in its own flue gas, so that the flue gas after being treated by the pretreatment device flows through the sampling device;

[0011] In the sampling device, the absorbent liquid in the honeycomb glass dissolver traps ammonia in the flue gas for nitrogen isotope analysis.

[0012] Optionally, the sampling device includes the honeycomb glass dissolver, an electronic flowmeter, and a vacuum pump that are sequentially arranged on a first pipeline. The inner wall of the honeycomb glass dissolver is uniformly coated with an absorbent liquid with a preset ratio;

[0013] The inlet end of the honeycomb glass dissolver is connected to the outlet of the pretreatment device through a first pipeline;

[0014] The outlet end of the honeycomb glass dissolver is connected to the electronic flowmeter, and the electronic flowmeter is connected to the vacuum pump;

[0015] The controller controls the sampling device to turn on the vacuum pump, so that the flue gas flows through the pretreatment device and records sampling information;

[0016] When the flue gas flows through the honeycomb glass dissolver, the absorbent liquid in the honeycomb glass dissolver reacts with ammonia in the flue gas to trap ammonia in the flue gas;

[0017] The flue gas after ammonia trapping passes through the electronic flowmeter and the vacuum pump and is discharged.

[0018] Optionally, the sampling device further includes a sleeve, and the honeycomb glass dissolver is vertically installed in the sleeve.

[0019] Optionally, the sampling device further includes a heat tracing sampling tube; the heat tracing sampling tube is arranged on the first pipeline in front of the honeycomb glass dissolver and is connected to the outlet of the pretreatment device;

[0020] The heat tracing sampling tube is used to heat the flue gas to prevent the remaining water vapor in the flue gas from condensing.

[0021] Optionally, it further includes:

[0022] After the controller determines that the current time reaches the preset sampling duration, it controls the sampling device to close the vacuum pump, determines that the current flue gas sampling is over, and stops the flue gas from entering the pretreatment device.

[0023] Optionally, it further includes: a solution storage device and a collection container;

[0024] The solution storage device and the collection container are respectively connected to the honeycomb glass dissolver;

[0025] After determining the end of the current flue gas sampling, the controller controls the solution storage to uniformly inject a preset solution into the honeycomb glass dissolver, so that the reactants are dissolved in the preset solution to obtain a processed preset solution.

[0026] The controller controls the collection container to extract the processed preset solution from the honeycomb glass dissolver.

[0027] Optionally, the pretreatment device includes a pitot tube, a filter membrane clamp, an inlet pipe, and a processing device.

[0028] The pitot tube is connected to the inlet pipe, and a filter membrane clamp is arranged between the pitot tube and the inlet pipe.

[0029] The inlet pipe is connected to the processing device, and the outlet of the processing device is connected to the inlet end of the sampling device.

[0030] Among them, the pretreatment device is used to remove the water vapor and particulate matter in the flue gas passing through itself, specifically:

[0031] The flue gas in the flue passes through the pitot tube and enters the filter membrane clamp.

[0032] The filter membrane in the filter membrane clamp removes the particulate matter in the flowing flue gas, so that the flue gas from which the particulate matter is removed flows through the processing device through the inlet pipe.

[0033] The processing device is used to heat the flue gas; and process the heated flue gas to remove water vapor.

[0034] Optionally, the processing device includes a heat tracing sleeve, a spiral condensing tube, and a cold chamber.

[0035] The heat tracing sleeve is arranged behind the pitot tube.

[0036] The cold chamber is arranged behind the heat tracing sleeve, and the spiral condensing tube is installed in the cold chamber.

[0037] The heat tracing sleeve heats the inlet pipe so that the flue gas passing through the inlet pipe is heated; the heated flue gas enters the spiral condensing tube for condensation to remove water vapor.

[0038] Optionally, the pretreatment device further includes a temperature control module and a refrigeration module.

[0039] The temperature control module is arranged at the end of the pretreatment device, and the refrigeration module is arranged at the cold chamber.

[0040] Among them, the controller detects that the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, specifically:

[0041] When the controller determines that the device has no air leakage, it controls the heating jacket to be heated to the corresponding preset temperature based on the preset temperature corresponding to the heating jacket preset in the temperature control module;

[0042] Based on the preset temperature of the heating sampling tube in the sampling device preset in the temperature control module, control the heating sampling tube to be heated to the corresponding preset temperature;

[0043] Based on the preset temperature corresponding to the cold cavity preset in the refrigeration module, control the cold cavity to be refrigerated to the corresponding preset temperature.

[0044] A second aspect of an embodiment of the present invention shows a method for sampling ammonia gas, which is applied to the ammonia gas sampling device shown in the first aspect of an embodiment of the present invention. The device includes: a pretreatment device, a sampling device, and a controller;

[0045] When the controller detects that the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, it controls the sampling device to turn on the vacuum pump so that the flue gas flows through the pretreatment device and records the sampling information;

[0046] The pretreatment device is used to remove the water vapor and particulate matter in the flue gas passing through itself, so that the flue gas after being treated by the pretreatment device flows through the sampling device;

[0047] The absorbent liquid in the honeycomb glass dissolver in the sampling device captures ammonia gas in the flue gas for nitrogen isotope analysis.

[0048] Based on the ammonia gas sampling device and method provided in the above embodiment of the present invention, the device includes: a pretreatment device, a sampling device, and a controller; the pretreatment device is arranged on the flue, the pretreatment device is connected to the sampling device through a pipeline, and the sampling device is set as a honeycomb glass dissolver; the controller is wirelessly connected to the pretreatment device and the sampling device respectively; when the controller detects that the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, it controls the sampling device to turn on the vacuum pump so that the flue gas flows through the pretreatment device and records the sampling information; the pretreatment device is used to remove the water vapor and particulate matter in the flue gas passing through itself, so that the flue gas after being treated by the pretreatment device flows through the sampling device; the absorbent liquid in the honeycomb glass dissolver in the sampling device captures ammonia gas in the flue gas, so as to accurately measure the nitrogen isotope characteristic value of NH3 in the high-temperature and high-humidity flue gas emitted by industry for subsequent nitrogen isotope analysis. Description of the Drawings

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0050] Figure 1 It is a schematic structural diagram of a sampling device for ammonia gas shown in an embodiment of the present invention;

[0051] Figure 2 It is a schematic structural diagram of a pretreatment device shown in an embodiment of the present invention;

[0052] Figure 3 It is a schematic structural diagram of a sampling device shown in an embodiment of the present invention;

[0053] Figure 4 It is a schematic structural diagram of another sampling device shown in an embodiment of the present invention;

[0054] Figure 5 It is a schematic flowchart of a sampling method for ammonia gas shown in an embodiment of the present invention. Detailed implementation manners

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0056] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and drawings of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0057] It should be noted that in the present invention, the descriptions involving "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] In this application, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0059] See Figure 1 , which is a schematic structural diagram of a sampling device for ammonia gas shown in an embodiment of the present invention. The device includes a pretreatment device 10, a sampling device 20, and a controller (not shown in the figure);

[0060] The pretreatment device 10 is disposed on the flue 30. The pretreatment device 10 is connected to the sampling device 20 through a pipeline. A honeycomb glass dissolver 21 is provided inside the sampling device 20;

[0061] The controller is wirelessly connected to the pretreatment device 10 and the sampling device 20 respectively;

[0062] When the controller detects that the components in the pretreatment device 10 and the sampling device 20 reach their corresponding preset temperatures, it controls the sampling device 20 to turn on the vacuum pump so that the flue gas flows through the pretreatment device 10 and records the sampling information;

[0063] Optionally, the honeycomb glass dissolver 21 needs to be constantly at a first temperature, which is set in advance based on multiple experiments and is generally a low temperature.

[0064] Optionally, before detecting the temperature, it is necessary to verify whether there is air leakage in each component of the device. Specifically, the inlet of the pitot tube in the pretreatment device 10 is closed, and the vacuum pump is controlled simultaneously. After a certain period of time, if it is determined that the reading of the electronic flowmeter in the sampling device 20 gradually becomes zero, it indicates that the device has no air leakage, and then the temperature detection is carried out.

[0065] It should be noted that a certain period of time is also set by technicians in advance according to experience or multiple experiments.

[0066] Specifically, when the controller determines that the device has no air leakage, it heats the corresponding parts based on the preset temperatures of each part set in the temperature control module of the preset processing device 10, and real-time detects the temperatures of each component in the pretreatment device and the sampling device; when the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, the honeycomb glass dissolver at the first temperature is installed in the device.

[0067] Next, control the sampling device 20 to turn on the vacuum pump so that the flue gas flows through the pretreatment device, and record the sampling information;

[0068] It should be noted that the sampling information includes the sampling start time and sampling flow rate of the flue gas;

[0069] The pretreatment device 10 is used to remove the water vapor and particulate matter in the flue gas passing through itself, so that the flue gas after being treated by the pretreatment device 10 flows through the sampling device 20;

[0070] The absorbent liquid in the honeycomb glass dissolver in the sampling device 20 traps ammonia in the flue gas.

[0071] In the embodiment of the present invention, it is used to collect ammonia (NH3) in high-temperature and high-humidity flue gas for nitrogen isotope analysis; it is necessary to first quickly condense the incoming flue gas through a pretreatment device to quickly remove most of the water vapor, and then the sampling device uses a honeycomb glass dissolver coated with an absorbent liquid to efficiently and quickly absorb ammonia in the flue gas; thus preventing the influence of high temperature and high humidity of industrial flue gas on the accuracy of sampling results.

[0072] Based on the ammonia sampling device shown in the above embodiment of the present invention, the embodiment of the present invention also shows a schematic diagram of the specific architecture of the pretreatment device, as Figure 2 shown, the pretreatment device specifically includes: a pitot tube 11, a filter membrane holder 12, an inlet pipe 13 and a processing device 14;

[0073] The pitot tube 11 is connected to the inlet pipe 13, and a filter membrane holder 12 is arranged between the pitot tube 11 and the inlet pipe 13;

[0074] The inlet pipe 13 is connected to the processing device 14, and the outlet of the processing device 14 is connected to the inlet end of the sampling device 20;

[0075] The pitot tube 11 is Figure 2 a bent tube at the very front end;

[0076] It should be noted that the Pitot tube 11 is made of stainless steel and is used to uniformly collect flue gas in the vertical direction of the flue.

[0077] Among them, the pretreatment device 10 is used to remove water vapor and particulate matter in the flue gas passing through itself, specifically for:

[0078] The flue gas in the flue enters the filter membrane holder 12 through the Pitot tube 11.

[0079] The filter membrane 121 in the filter membrane holder 12 removes particulate matter in the flowing flue gas, so that the flue gas from which particulate matter has been removed flows through the inlet pipe 13 and passes through the treatment device 14.

[0080] The treatment device 14 is used to heat the flue gas; and the heated flue gas is processed to remove water vapor.

[0081] It should be noted that the filter membrane 121 in the filter membrane holder 12 is a quartz fiber filter membrane.

[0082] A quartz fiber filter membrane is installed in the filter membrane holder 12 to remove particulate matter in the flue gas. The inside of the filter membrane holder 12 is coated with Teflon, which is heat-resistant and has low adsorption, facilitating subsequent chemical component analysis of the particulate matter collected by the quartz fiber filter membrane.

[0083] Furthermore, it should be noted that the treatment device 14 includes a heating jacket 141, a spiral condenser 142, and a cold chamber 143.

[0084] The heating jacket 141 is arranged behind the Pitot tube 11, and the heating jacket 141 is inserted into the flue.

[0085] The cold chamber 143 is arranged behind the heating jacket 141, that is, at the end of the inlet pipe 13, and the spiral condenser 142 is installed in the cold chamber 143.

[0086] Among them, the number of spiral condensers 142 is 2.

[0087] It should be noted that the heating jacket 141 is used to heat the collected flue gas to prevent water vapor from condensing. Its outer shell is made of stainless steel, and its interior is a heating wire and heat-insulating material.

[0088] The heating jacket 141 heats the inlet pipe so that the flue gas passing through the inlet pipe is heated; the heated flue gas enters the spiral condenser for condensation to remove water vapor.

[0089] Specifically, the heating jacket 141 heats the inlet pipe to heat the flue gas passing through the inlet pipe 13, and then enters the cold chamber 143 and the spiral condenser 142 for condensation to remove water vapor.

[0090] Specifically, since the heat tracing sleeve 141 is at the corresponding preset temperature and can heat the intake pipe 13, at this time, the flue gas passes through the intake pipe 13 and then enters the cold cavity 143 and the spiral condenser 142;

[0091] Since the cold cavity 143 is at the corresponding preset temperature, it can rapidly cool the high-temperature flue gas, causing the water vapor in the flue gas to rapidly condense. Two spiral condensers 142 are installed in the cold cavity 143 to achieve secondary condensation of water vapor. That is to say, the hot steam passing through the cold cavity 143 and the spiral condenser 142 is condensed to remove most of the water vapor in the flue gas.

[0092] It should be noted that since the number of the spiral condensers 142 is 2, two condensations are required.

[0093] Specifically, the flue gas in the flue passes through the pitot tube 11 and enters the filter membrane holder 12, and the particulate matter in the flue gas is removed by the filter membrane in the filter membrane holder 12; the flue gas from which the particulate matter has been removed passes through the intake pipe 13 and enters the cold cavity 143 and the spiral condenser 142, so that the cold cavity 143 and the spiral condenser 142 condense the water vapor in the flue gas to remove the water vapor in the flue gas.

[0094] It should be noted that the heat tracing sleeve 141 is used to heat the intake pipe 13 to prevent the condensation of water vapor in the flue gas.

[0095] Among them, the maximum heating temperature of the heat tracing sleeve 141 can be set to 180 °C. Its outer shell is made of stainless steel, and the inside is filled with heat-insulating material and heating wire. The intake pipe is made of Teflon, which is heat-resistant and has low adsorption.

[0096] It should be noted that the outer shell of the cold cavity 143 is made of plastic, and the inside is filled with heat-insulating material. It is spirally fixed to the refrigeration module 16 for easy removal. Two spiral condensers 142 are installed in the cold cavity 143 to achieve secondary condensation of water vapor.

[0097] The spiral condenser 142 is made of high borosilicate glass. The intake ports at both ends are connected to the intake pipe 13 with spiral joints for easy removal, cleaning and replacement. The bottom of the spiral condenser 142 is open. When the condensed water in the spiral condenser 142 accumulates to a certain volume, the accumulated condensed water can be discharged from the bottom opening for convenient sampling and analysis of the condensed water.

[0098] Optionally, based on the above Figure 2 shown pretreatment device, the pretreatment device 10 further includes a temperature control module 15 and a refrigeration module 16;

[0099] The temperature control module 15 is arranged at the tail end of the pretreatment device 10, and the refrigeration module 16 is arranged at the cold cavity 143;

[0100] Among them, the controller detects that the components in the pretreatment device and the sampling device have reached their corresponding preset temperatures, specifically used for:

[0101] When the controller determines that the device has no air leakage, it controls the heating jacket 141 to be heated to the corresponding preset temperature based on the preset temperature corresponding to the heating jacket 141 preset in the temperature control module 15;

[0102] Based on the preset temperature of the heat tracing sampling tube in the sampling device 20 preset in the temperature control module 15, it controls the heat tracing sampling tube to be heated to the corresponding preset temperature;

[0103] Based on the preset temperature of the cold cavity preset in the refrigeration module 16, it controls the cold cavity to be refrigerated to the corresponding preset temperature.

[0104] In specific implementation, the user can input the corresponding preset temperatures of each component through the controller, and the controller writes them into the corresponding components based on the corresponding preset temperatures input by the user. For example, the preset temperature that becomes larger is written into the temperature control module 15 for heating; the preset temperature that becomes smaller is written into the refrigeration module 16 for refrigeration.

[0105] Then, it controls the temperature control module 15 and the refrigeration module 16 to start, so that the temperature control module 15 heats the heating jacket 141 to the corresponding preset temperature and heats the heat tracing sampling tube to the corresponding preset temperature;

[0106] The refrigeration module 16 refrigerates the cold cavity 143 to the corresponding preset temperature.

[0107] It should be noted that the preset temperature of the heating jacket 141 written in the temperature control module 15 is the heating temperature of 180 °C, and the preset temperature of the heat tracing sampling tube is the heating temperature of 60 °C; the preset temperature of the cold cavity 143 written in the refrigeration module 16 is the refrigeration temperature of 4 °C.

[0108] Optionally, the preheating time for the controller to control the temperature control module 15 and the refrigeration module 16 can be 10 minutes.

[0109] Optionally, the refrigeration module 16 is used to refrigerate the cold cavity 143, and the working temperature is set to 4 °C, which can quickly cool down the high-temperature flue gas and cause the water vapor in the flue gas to quickly condense. It uses electronic refrigeration, with a small volume and a fast refrigeration speed.

[0110] Optionally, continue to refer to Figure 2 The pretreatment device 10 further includes a handle 17 for fixing the temperature control module 15.

[0111] In an embodiment of the present invention, after the controller determines that the components in the pretreatment device and the sampling device reach the corresponding preset temperature, i.e., the operating temperature, the honeycomb glass dissolver is installed; then the vacuum pump is turned on, so that the flue gas generated by the factory enters the filter membrane holder through the pitot tube, and the particulate matter in the flue gas is removed by the filter membrane in the filter membrane holder, and then enters the cold chamber and the spiral condenser through the inlet pipe. Most of the water vapor in the flue gas is removed through two condensations. The cold chamber can be removed to facilitate the discharge of the collected condensed water from the bottom opening of the spiral condenser; thus, the water vapor in the flue gas is effectively removed, avoiding the influence of high humidity on the collection effect of NH3 in the flue gas.

[0112] Based on the ammonia sampling device shown in the above embodiment of the present invention, the embodiment of the present invention also shows a schematic diagram of the specific architecture of the sampling device, as Figure 3 shown, the honeycomb glass dissolver 21, the electronic flowmeter 22 and the vacuum pump 23 are sequentially arranged on the first pipeline. The inner wall of the honeycomb glass dissolver 21 is uniformly coated with an absorption liquid with a preset ratio;

[0113] The inlet end of the honeycomb glass dissolver 21 is connected to the outlet of the pretreatment device 10 through the first pipeline;

[0114] The outlet end of the honeycomb glass dissolver 21 is connected to the electronic flowmeter 22, and the electronic flowmeter 22 is connected to the vacuum pump 23;

[0115] Among them, the electronic flowmeter 22 is used to control the sampling flow rate of the flue gas. The sampling flow rate is set to 10 L / min, and the sampling time is 30 min.

[0116] Optionally, continue to refer to Figure 2 , the sampling device 20 further includes a sleeve 24, and the honeycomb glass dissolver 21 is vertically installed in the sleeve 24.

[0117] Specifically, the inlet pipe 13 and the sleeve 24 are connected by a heat tracing sampling pipe 15, and the sleeve 24, the electronic flowmeter 22 and the vacuum pump 23 are connected by a Teflon sampling pipe.

[0118] It should be noted that the sleeve 24 is used to install the honeycomb glass dissolver 21, which is vertically installed, and the air flow enters from the lower port and flows out from the upper port. It is made of aluminum alloy, and the upper and lower end covers are fixed by buckles, which is convenient for installing the dissolver.

[0119] The honeycomb glass dissolver 21 is made of cylindrical borosilicate glass and is provided with dense honeycomb-shaped holes, which can achieve efficient absorption of NH3 in the flue gas.

[0120] Optionally, after all the devices are connected, a airtightness test is carried out.

[0121] The controller controls the sampling device 20 to turn on the vacuum pump 23 so that the flue gas flows through the pretreatment device and records the sampling information;

[0122] When the flue gas flows through the honeycomb glass dissolver 21, the absorbent liquid in the honeycomb glass dissolver 21 reacts with ammonia in the flue gas to capture ammonia in the flue gas;

[0123] The flue gas after ammonia capture is discharged through the electronic flowmeter 22 and the vacuum pump 23.

[0124] Specifically, the sleeve 24 is vertically installed, and the flue gas treated by the pretreatment device 10 enters through the lower end cover of the sleeve 24 and passes through the honeycomb glass dissolver 21. NH3 in the flue gas reacts with the absorbent liquid coated on the inner wall of the honeycomb glass dissolver 21 through diffusion, that is, the flue gas diffusing through the honeycomb glass dissolver 21 reacts with the absorbent liquid on the inner wall of the honeycomb glass dissolver 21 to obtain a reaction product; the flue gas flows out from the upper end cover of the sleeve 24 and is discharged through the electronic flowmeter 22 and the vacuum pump 23.

[0125] It should be noted that the residual particulate matter and water vapor in the air mass diffuse slowly and do not react with the absorbent liquid on the inner wall, and are discharged with the air mass. Therefore, it is possible to avoid the influence of the residual particulate matter and water vapor containing NH4 + on the nitrogen isotope characteristics of NH3.

[0126] Among them, the reaction product is ammonium (NH4 + ), and the reaction product obtained by the reaction adheres to the inner wall of the honeycomb glass dissolver 21.

[0127] It should be noted that the absorbent liquid is 2% citric acid and 1% glycerol.

[0128] Optionally, referring to the sampling device shown above, the sampling device 20 further includes a heat tracing sampling pipe 25; the heat tracing sampling pipe 25 is arranged on the first pipeline in front of the honeycomb glass dissolver 21 and is connected to the air outlet of the pretreatment device 10;

[0129] The heat tracing sampling pipe 25 is used to heat the flue gas to prevent the remaining water vapor in the flue gas from condensing.

[0130] Specifically, the heat tracing sampling pipe 15 is used to keep the flue gas flowing out of the pretreatment device 10 warm and heated, the working temperature is set at 60 °C, the internal gas pipeline is a Teflon pipe, and the outside is wrapped with a heating wire and heat insulation material.

[0131] Based on the sampling device shown above, a specific structure diagram of another sampling device is also shown. The sampling device 20 further includes an absorbent liquid storage 26 connected to the honeycomb glass dissolver 21, as Figure 4 shown.

[0132] When the controller detects that the devices in the pretreatment device and the sampling device reach their corresponding preset temperatures, it controls the absorbent solution storage 26 to inject the absorbent solution with a preset ratio into the honeycomb glass dissolver 21, so that the absorbent solution is evenly coated on the inner wall of the honeycomb glass dissolver 21.

[0133] It should be noted that the absorbent solution storage 26 is used to store the absorbent solution with a preset ratio.

[0134] Specifically, before the sampling starts, the controller controls the absorbent solution storage 26 to inject a certain dose of absorbent solution into the honeycomb glass dissolver 21; the absorbent solution is evenly coated on the inner wall of the honeycomb glass dissolver 21, and the inner wall of the dissolver is purged with high-purity nitrogen.

[0135] It should be noted that the injection dose of the absorbent solution is set by the technician in advance according to experiments, and can generally be set to 10 ml.

[0136] It should be emphasized that the honeycomb glass dissolver 21 is in a low-temperature state during the working process.

[0137] Optionally, it further includes:

[0138] When the controller determines that the current time reaches the preset sampling duration, it controls the sampling device 20 to close the vacuum pump 23, determines that the current flue gas sampling is completed, and stops the flue gas from entering the pretreatment device 10.

[0139] It should be noted that the preset sampling duration is written into the controller by the user in advance.

[0140] Specifically, the controller continuously detects whether the current time reaches the preset sampling duration. After determining that the current time reaches the preset sampling duration, it controls the sampling device 20 to close the vacuum pump, so that the flue gas cannot enter the pretreatment device 10 again, determines that the current flue gas sampling is completed, and stops the flue gas from entering the pretreatment device 10.

[0141] Continue to refer to Figure 4 , the sampling device 20 further includes a solution storage 27 and a collection container 28;

[0142] The solution storage 27 and the collection container 28 are respectively connected to the honeycomb glass dissolver 21;

[0143] After the controller determines that the current flue gas sampling is completed, it closes the honeycomb glass dissolver 21, controls the solution storage 27 to evenly inject a preset solution into the honeycomb glass dissolver 21, dissolves the reactants in the preset solution, and obtains the processed preset solution;

[0144] The controller controls the collection container 28 to extract the processed preset solution from the honeycomb glass dissolver 21.

[0145] Specifically, after the controller determines that the current flue gas sampling is completed, it closes the honeycomb glass dissolver 21, injects a certain dose of preset solution stored in the solution memory 27 into the honeycomb glass dissolver 21; uniformly dissolves the inner wall absorbent and reactants in the preset solution; after reacting for a certain time, that is, after complete dissolution, extracts the processed preset solution from the honeycomb glass dissolver 21 to the collection container.

[0146] It should be noted that the preset solution is ultrapure water, and its dose is set by technicians in advance according to experiments, and can generally be set to 10 ml.

[0147] In the embodiment of the present invention, after the preset solution elutes the eluate, that is, the reactant is dissolved in the preset solution, it can be used for nitrogen isotope analysis.

[0148] In the embodiment of the present invention, before the flue gas exits the pretreatment device and enters the sleeve, it is heated by the trace heating sampling pipe to prevent the remaining water vapor from condensing. The sleeve is vertically installed, and the flue gas enters from the lower end cover of the sleeve and passes through the honeycomb glass dissolver. NH3 in the flue gas reacts with the absorbent coated inside the honeycomb glass dissolver through diffusion to generate reactants. After the flue gas exits from the upper end cover of the sleeve, it is discharged through an electronic flow meter and a vacuum pump. After sampling is completed, the honeycomb glass dissolver is eluted with preset ultrapure water, and the eluate can be used for isotope analysis. This method overcomes the problems of nitrogen fractionation, water vapor condensation in the pipeline, and mixing with the absorbent in the traditional manual sampling method for high-temperature and high-humidity flue gas, which cause inaccurate analysis of ammonia nitrogen isotope characteristics, and can realize efficient, rapid, and accurate collection of NH3 in the flue gas for nitrogen isotope characteristic analysis.

[0149] Based on the ammonia sampling device shown in the above embodiment of the present invention, correspondingly, the embodiment of the present invention also correspondingly shows a flow schematic diagram of a method for sampling ammonia, as Figure 5 shown, the method includes:

[0150] Step S501: When the controller detects that the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, it controls the sampling device to turn on the vacuum pump so that the flue gas flows through the pretreatment device and records the sampling information;

[0151] Step S502: The pretreatment device is used to remove the water vapor and particulate matter in the flue gas passing through itself, so that the flue gas after being processed by the pretreatment device flows through the sampling device;

[0152] Step S503: The absorbent liquid in the honeycomb glass dissolver in the sampling device captures ammonia in the flue gas for ammonia nitrogen isotope analysis.

[0153] It should be noted that the specific implementation processes of steps S501 to S503 are the same as the specific contents of each unit of the above-mentioned sampling device for ammonia, and reference can be made to each other.

[0154] Optionally, it further includes:

[0155] When the flue gas flows through the honeycomb glass dissolver, the absorbent liquid in the honeycomb glass dissolver reacts with ammonia in the flue gas to capture ammonia in the flue gas;

[0156] The flue gas after ammonia capture is discharged through the electronic flowmeter and the vacuum pump.

[0157] Optionally, the heat tracing sampling pipe is used to heat the flue gas to prevent the remaining water vapor in the flue gas from condensing.

[0158] Optionally, it further includes:

[0159] After the controller determines that the current time reaches the preset sampling duration, it controls the sampling device to close the vacuum pump, determines that the current flue gas sampling is over, and stops the flue gas from entering the pretreatment device.

[0160] Optionally, it further includes:

[0161] After the controller determines that the current flue gas sampling is over, it controls the solution storage to uniformly inject a preset solution into the honeycomb glass dissolver, dissolves the reactants in the preset solution, and obtains the processed preset solution;

[0162] The controller controls the collection container to extract the processed preset solution from the honeycomb glass dissolver.

[0163] Optionally, the pretreatment device is used to remove water vapor and particulate matter in the flue gas passing through itself, specifically:

[0164] The flue gas in the flue duct enters the filter membrane holder through the pitot tube;

[0165] The filter membrane in the filter membrane holder removes particulate matter in the flowing flue gas, so that the flue gas from which particulate matter has been removed passes through the intake pipe and flows through the processing device;

[0166] The processing device is used to heat the flue gas; and processes the heated flue gas to remove water vapor.

[0167] Optionally, the heat tracing sleeve heats the intake pipe so that the flue gas passing through the intake pipe is heated; the heated flue gas enters the spiral condensation pipe for condensation to remove water vapor.

[0168] Optionally, when the controller detects that the components in the pretreatment device and the sampling device reach their respective preset temperatures, it is specifically configured to:

[0169] When the controller determines that the device has no air leakage, it controls the heat tracing sleeve to be heated to the corresponding preset temperature based on the preset temperature of the heat tracing sleeve preset in the temperature control module;

[0170] Based on the preset temperature of the heat tracing sampling pipe in the sampling device preset in the temperature control module, it controls the heat tracing sampling pipe to be heated to the corresponding preset temperature;

[0171] Based on the preset temperature of the cold chamber preset in the refrigeration module, it controls the cold chamber to be refrigerated to the corresponding preset temperature.

[0172] In the embodiments of the present invention, since the industrial flue gas has a high temperature and high humidity, it has a certain impact on the accuracy of the sampling result. Therefore, it is necessary to first quickly condense the incoming flue gas through a pretreatment device to quickly remove most of the water vapor, and then the sampling device uses a honeycomb glass dissolver coated with an absorbent solution to efficiently and quickly absorb ammonia in the flue gas. To meet the requirements for nitrogen stable isotope analysis of ammonia in the flue gas. So as to subsequently establish the ammonia-nitrogen isotope source spectra of different emission sources, accurately trace ammonia in the atmosphere, and provide support for the treatment of atmospheric haze.

[0173] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments. The systems and system embodiments described above are only illustrative, where the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0174] Those skilled in the art may further realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0175] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sampling device for ammonia, characterized in that, The device includes: a pretreatment device, a sampling device, and a controller; The pretreatment device is arranged on the flue, the pretreatment device is connected to the sampling device through a pipeline, and a honeycomb glass dissolver is arranged inside the sampling device; The controller is wirelessly connected to the pretreatment device and the sampling device respectively; When the controller detects that the components in the pretreatment device and the sampling device reach the corresponding preset temperatures, it controls the sampling device to turn on the vacuum pump so that the flue gas flows through the pretreatment device and records the sampling information; The pretreatment device is used to remove the water vapor and particulate matter in the flue gas passing through itself, so that the flue gas after being treated by the pretreatment device flows through the sampling device; The absorbent liquid in the honeycomb glass dissolver in the sampling device captures the ammonia in the flue gas for nitrogen isotope analysis.

2. The device according to claim 1, characterized in that The sampling device includes the honeycomb glass dissolver, an electronic flowmeter, and a vacuum pump that are sequentially arranged on a first pipeline. The inner wall of the honeycomb glass dissolver is evenly coated with an absorbent liquid with a preset ratio; The air inlet end of the honeycomb glass dissolver is connected to the air outlet of the pretreatment device through a first pipeline; The air outlet end of the honeycomb glass dissolver is connected to the electronic flowmeter, and the electronic flowmeter is connected to the vacuum pump; The controller controls the sampling device to turn on the vacuum pump so that the flue gas flows through the pretreatment device and records the sampling information; When the flue gas flows through the honeycomb glass dissolver, the absorbent liquid in the honeycomb glass dissolver reacts with the ammonia in the flue gas to capture the ammonia in the flue gas; The flue gas after ammonia capture passes through the electronic flowmeter and the vacuum pump and is discharged.

3. The device according to claim 2, wherein The sampling device further includes a sleeve, and the honeycomb glass dissolver is vertically installed in the sleeve.

4. The device according to claim 2, wherein The sampling device further includes a heat tracing sampling pipe; the heat tracing sampling pipe is arranged on the first pipeline in front of the honeycomb glass dissolver and is connected to the air outlet of the pretreatment device; The heat tracing sampling pipe is used to heat the flue gas to prevent the remaining water vapor in the flue gas from condensing.

5. The device according to claim 2, wherein It further includes: When the controller determines that the current time reaches the preset sampling duration, it controls the sampling device to close the vacuum pump, determines that the current flue gas sampling is over, and stops the flue gas from entering the pretreatment device.

6. The device according to claim 5, characterized in that It further includes: A solution storage device and a collection container; The solution storage device and the collection container are respectively connected to the honeycomb glass dissolver; After the controller determines that the current flue gas sampling is over, it controls the solution storage device to uniformly inject a preset solution into the honeycomb glass dissolver, dissolves the reactants in the preset solution, and obtains a processed preset solution; The controller controls the collection container to extract the processed preset solution from the honeycomb glass dissolver.

7. The device according to claim 1, characterized in that, The pretreatment device includes a pitot tube, a filter membrane clip, an air inlet pipe, and a processing device; The pitot tube is connected to the air inlet pipe, and a filter membrane clip is arranged between the pitot tube and the air inlet pipe; The air inlet pipe is connected to the processing device, and the air outlet of the processing device is connected to the air inlet end of the sampling device; Among them, the pretreatment device is used to remove water vapor and particulate matter in the flue gas passing through itself, and specifically is used for: The flue gas in the flue passes through a pitot tube and enters a filter membrane holder; The filter membrane in the filter membrane holder removes particulate matter in the flowing flue gas, so that the flue gas from which particulate matter has been removed flows through the processing device through the inlet pipe; The processing device is used to heat the flue gas; and process the heated flue gas to remove water vapor.

8. The device according to claim 7, characterized in that The processing device includes a heating jacket, a spiral condenser and a cold chamber; The heating jacket is arranged behind the pitot tube; The cold chamber is arranged behind the heating jacket, and the spiral condenser is installed in the cold chamber; The heating jacket heats the inlet pipe so that the flue gas passing through the inlet pipe is heated; the heated flue gas enters the spiral condenser for condensation to remove water vapor.

9. The device according to claim 8, wherein The pretreatment device further includes a temperature control module and a refrigeration module; The temperature control module is arranged at the tail end of the pretreatment device, and the refrigeration module is arranged at the cold chamber; Among them, when the controller detects that the components in the pretreatment device and the sampling device have reached the corresponding preset temperatures, specifically for: When the controller determines that there is no air leakage in the device, it controls the heating jacket to be heated to the corresponding preset temperature based on the preset temperature of the heating jacket preset in the temperature control module; Controls the heating of the heated sampling tube in the sampling device to the corresponding preset temperature based on the preset temperature of the heated sampling tube preset in the temperature control module; Controls the cold chamber to be cooled to the corresponding preset temperature based on the preset temperature of the cold chamber preset in the refrigeration module.

10. A method for sampling ammonia, characterized in that, Applied to the ammonia sampling device according to any one of claims 1-9, the device includes: a pretreatment device, a sampling device and a controller; When the controller detects that the components in the pretreatment device and the sampling device have reached the corresponding preset temperatures, it controls the sampling device to turn on the vacuum pump so that the flue gas flows through the pretreatment device and records the sampling information; The pretreatment device is used to remove water vapor and particulate matter in the flue gas passing through itself, so that the flue gas processed by the pretreatment device flows through the sampling device; The absorbent liquid in the honeycomb glass dissolver in the sampling device captures ammonia in the flue gas for nitrogen isotope analysis.

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