Absorption detection device for organic amine applied to tail gas desulfurization process

Abstract

The utility model relates to an organic amine absorption detection device suitable for a tail gas desulfurization process. The flowmeter, the sulfur dioxide concentration analyzer, the thermometer and the pressure gauge are connected to the main gas inlet pipeline in series, a main gas inlet valve is arranged on the main gas inlet pipeline connected with the drying device, the drying device is communicated with the tail gas treatment and absorption device and the absorption device, and a bypass valve is arranged on a gas pipe leading to the tail gas treatment and absorption device. An absorption gas inlet valve is arranged on a gas pipe leading to the absorption device, the absorption device is connected with the tail gas treatment and absorption device through a gas pipe, the tail gas treatment and absorption device is connected with the tail gas drying device through a gas pipe, an exhaust pipe is arranged on the tail gas drying device, and seals are arranged on the drying device, the absorption device, the tail gas treatment and absorption device and the tail gas drying device. Platform scales are arranged below the absorption device, the tail gas treatment absorption device and the tail gas drying device to meter the mass change condition of the device. The utility model has the advantages that the materials are easy to obtain, the assembly is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to a detection device, in particular to an absorption detection device of organic amines used in a tail gas desulfurization process. Background Art

[0002] The detection technology of organic amines in tail gas desulfurization process is applied in the fields of petrochemical, metallurgy and sulfuric acid industry technology.

[0003] The organic amine tail gas desulfurization process is used to remove acidic gases (CO2, H2S, etc.) from the raw gas in the petrochemical field, as well as the SO2 enrichment and reuse process in the tail gas of the metallurgical and sulfuric acid industries. The organic amine tail gas desulfurization process uses the characteristics of organic amines to adsorb acidic gases at low temperatures and decompose acidic gases at high temperatures to separate acidic gases from the tail gas. In the application of the organic amine tail gas desulfurization process, the organic amines that are used for circulating heating and cooling absorption to remove acidic gases from the tail gas are prone to generate impurities such as sulfate, thiosulfate and carbonate due to side reactions, and may cause the degradation of organic amines due to heating or impurities in the tail gas, thereby causing organic amine loss and reduced enrichment efficiency. In the design stage of the organic amine tail gas desulfurization process, parameters such as organic amine concentration, heating temperature, and organic amine circulation volume need to be set.

[0004] In the application of organic amine tail gas desulfurization process in petrochemical, metallurgical and sulfuric acid industries, the components in the tail gas are complex and changeable. Therefore, in order to understand the impurity generation and pH and other characteristic parameter changes of organic amine in the actual application process, and better guide the design of organic amine tail gas desulfurization process parameters, it is necessary to conduct experiments to study the characteristic parameters and impurity generation of organic amine under different absorption conditions. There is no reliable test bench for testing the performance of organic amine absorption process. Utility Model Content

[0005] The purpose of the utility model is to provide an organic amine absorption detection device suitable for tail gas desulfurization process. The device detects the organic amine absorption process and obtains the characteristic parameters of the organic amine under different conditions of acid gas absorption through titration analysis, ion chromatography analysis and other detection methods.

[0006] The utility model is realized by the following technical solutions:

[0007] An organic amine absorption detection device used in a tail gas desulfurization process, comprising a main air intake valve, a main air intake pipeline, a sulfur dioxide concentration detector, a thermometer, a pressure gauge, a flow meter, a bypass valve, an absorption air intake valve, a seal, a drying device, a desiccant, an organic amine absorbent, a platform scale, an absorption device, a tail gas treatment absorption device, a tail gas drying device and an alkali solution;

[0008] The drying device and tail gas drying device include a desiccant and a flask for containing the desiccant. The desiccant can be a liquid desiccant or a solid desiccant. The total amount of the desiccant is required to absorb all moisture in the sample gas.

[0009] The absorption device comprises an organic amine absorbent and a flask for containing the absorbent;

[0010] The tail gas treatment absorption device includes an alkaline solution for absorbing acidic gas and a flask for containing the alkaline solution;

[0011] The tail gas drying device includes a desiccant and a flask for containing the desiccant. The desiccant can be a liquid desiccant or a solid desiccant. The total amount of the desiccant is required to absorb all the moisture in the sample gas.

[0012] A flow meter, a sulfur dioxide concentration analyzer, a thermometer and a pressure gauge are connected in series on the main air intake pipe, on which a main air intake valve is arranged, which is connected to a drying device and inserted into a desiccant, the drying device is connected to the exhaust gas treatment absorption device and the absorption device through an air pipe respectively, a bypass valve is arranged on the air pipe leading to the exhaust gas treatment absorption device, an absorption air intake valve is arranged on the air pipe leading to the absorption device, the absorption device is connected to the exhaust gas treatment absorption device through an air pipe, the exhaust gas absorption treatment device is connected to the exhaust gas drying device through an air pipe, there is an exhaust pipe on the exhaust gas drying device, the drying device, the absorption device, the exhaust gas treatment absorption device and the exhaust gas drying device are provided with seals to ensure that there is no gas leakage, a platform scale is arranged under the absorption device, the exhaust gas treatment absorption device and the exhaust gas drying device to measure the mass change.

[0013] The utility model proposes a test device to optimize the process parameters of organic amine absorption, obtain the maximum absorption of organic amine for different acidic gases, and then determine the minimum circulation amount of organic amine in the organic amine adsorption and analysis process. The device has the advantages of easy material acquisition, simple assembly, and low cost, and can be well adapted to the existing amine liquid detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model. DETAILED DESCRIPTION

[0015] like Figure 1 As shown, the utility model is an absorption detection device for organic amines suitable for a tail gas desulfurization process, comprising a main air intake valve 1, a main air intake pipe 2, a sulfur dioxide concentration detector 3, a thermometer 4, a pressure gauge 5, a flow meter 6, a bypass valve 7, an absorption air intake valve 8, a seal 9, a drying device 10, a desiccant 11, an organic amine absorbent 12, a scale 13, an absorption device 14, a tail gas treatment absorption device 15, a tail gas drying device 16 and an alkali solution 17.

[0016] The drying device 10 and the tail gas drying device 16 include a desiccant 11 and a flask for containing the desiccant. The desiccant 11 can be a liquid desiccant or a solid desiccant. The total amount of the desiccant 11 is required to absorb all the moisture in the sample gas.

[0017] The absorption device 14 comprises a flask for holding the organic amine absorbent 12;

[0018] The tail gas treatment absorption device 15 comprises an alkaline solution 17 for absorbing acidic gas and a flask for containing the alkaline solution;

[0019] The tail gas drying device 16 comprises a desiccant 11 and a flask for containing the desiccant. The desiccant 11 can be a liquid desiccant or a solid desiccant. The total amount of the desiccant 11 is required to absorb all the moisture in the sample gas.

[0020] The flow meter 6, the sulfur dioxide concentration analyzer 3, the thermometer 4, and the pressure gauge 5 are connected in series on the main air intake pipe 2, and the main air intake pipe 2 is provided with a main air intake valve 1. The main air intake pipe 2 is connected to the drying device 10, and the drying device 10 is filled with a desiccant 11, and the main air intake pipe 2 needs to be inserted into the desiccant 11. The drying device 10 is connected to the tail gas treatment absorption device 15 and the absorption device 14 through the air pipe, and the air pipe leading to the tail gas treatment absorption device 15 is provided with a bypass valve 7, and the air pipe leading to the absorption device 14 is provided with an absorption air intake valve 8. The absorption device 14 is connected to the tail gas treatment absorption device 15 through the air pipe. The tail gas absorption treatment device 15 is connected to the tail gas drying device 16 through the air pipe. The tail gas drying device 16 has an exhaust pipe. The drying device 10, the absorption device 14, the tail gas treatment absorption device 15, and the tail gas drying device 16 are provided with a seal 9 to ensure that the gas does not leak. A platform scale 13 needs to be arranged under the absorption device 14, the tail gas treatment absorption device 15 and the tail gas drying device 16 to measure the mass changes of the measurement devices.

[0021] The working process of the utility model is as follows:

[0022] Step S0: Prepare the absorbent, and prepare an organic amine solution of target concentration according to the manufacturer's standard amine solution preparation process.

[0023] Step S1: Select appropriate amounts of desiccant 11, alkali solution 17 and organic amine sample prepared by S0. Fill desiccant 11, organic amine absorbent 12 and alkali solution 17 into absorption device 14, drying device 10, tail gas drying device 16 and tail gas treatment absorption device 15 respectively.

[0024] Step S2: Assembling an organic amine absorption detection process test bench and an analytical detection process test bench.

[0025] Step S3: Connect the sampling port to the sample gas. For example, in the design stage, the sample gas needs to be configured according to the actual situation.

[0026] Step S4: Open the main air intake valve 1 and the bypass valve 7, close the absorption air intake valve 8, and directly pass the standard gas or sample gas into the tail gas treatment absorption device 15. Calibrate the flow meter, sulfur dioxide concentration analyzer, and pressure gauge.

[0027] Step S5: Calculate the sulfur dioxide input mass according to the temperature, pressure, flow rate and sulfur dioxide concentration. Since the tail gas pressure is generally low, the sulfur dioxide mass M can be calculated using the ideal gas state equation. Compare the change in the reading of the scale 13 (M2+M3) with the sulfur dioxide input mass to determine whether the instrument is accurate. If the reading is accurate (M=M2+M3), record the pressure, temperature, flow rate and sulfur dioxide concentration parameter values.

[0028] Step S6: Open the main air intake valve 11 and the absorption air intake valve 8, close the bypass valve 7, and pass the sample gas to the absorption device 14.

[0029] Step S7: Take samples at different points (e.g. M1 = 100 g, 110 g, 120 g, etc.) of the sulfur dioxide absorption amount in the absorption device 14, and test the concentration of each ion (NH + 、Na + , K + , Fe 3+ , Fe 2+ , Cl - 、F - …), pH, foaming rate, moisture, and color characteristic parameters.

[0030] By using the device of the utility model, in the design stage of tail gas desulfurization process, parameter characterization of various types of organic amines at different acid gas absorption rates can be obtained more accurately according to the sample gas, and the maximum acid gas absorption per unit mass of organic amine can be obtained. The design reference values ​​such as the amine liquid circulation volume can be provided for the design of tail gas desulfurization process, which can avoid tail gas exceeding the standard due to insufficient absorption.

[0031] According to the test results, in the actual application stage of the tail gas desulfurization process, the degree of absorption reaction can be quickly determined based on the organic amine sampling test results and the test results of the utility model device, which can greatly improve the accuracy and convenience of adjusting process parameters.

Claims

1. An absorption detection device for organic amines used in tail gas desulfurization process, characterized by: Including main air intake valve, main air intake pipeline, sulfur dioxide concentration detector, thermometer, pressure gauge, flow meter, bypass valve, absorption air intake valve, seal, drying device, desiccant, organic amine absorbent, platform scale, absorption device, tail gas treatment absorption device, tail gas drying device and alkali solution; The drying device and tail gas drying device include a desiccant and a flask for containing the desiccant, and the total amount of the desiccant is required to absorb all the moisture in the sample gas; The absorption device comprises an organic amine absorbent and a flask for containing the absorbent; The tail gas treatment absorption device includes an alkaline solution for absorbing acidic gas and a flask for containing the alkaline solution; The tail gas drying device includes a desiccant and a flask for containing the desiccant. The total amount of the desiccant is required to absorb all the moisture in the sample gas; A flow meter, a sulfur dioxide concentration analyzer, a thermometer and a pressure gauge are connected in series on the main air intake pipe, on which a main air intake valve is arranged, which is connected to a drying device and inserted into a desiccant, the drying device is connected to the exhaust gas treatment absorption device and the absorption device through an air pipe respectively, a bypass valve is arranged on the air pipe leading to the exhaust gas treatment absorption device, an absorption air intake valve is arranged on the air pipe leading to the absorption device, the absorption device is connected to the exhaust gas treatment absorption device through an air pipe, the exhaust gas absorption treatment device is connected to the exhaust gas drying device through an air pipe, there is an exhaust pipe on the exhaust gas drying device, the drying device, the absorption device, the exhaust gas treatment absorption device and the exhaust gas drying device are provided with seals to ensure that there is no gas leakage, a platform scale is arranged under the absorption device, the exhaust gas treatment absorption device and the exhaust gas drying device to measure the mass change.

2. The absorption detection device of organic amine used in tail gas desulfurization process according to claim 1 is characterized in that: The desiccant is a liquid desiccant or a solid desiccant.

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