Nitrogen oxide gas absorption test device

Abstract

The utility model provides a nitrogen oxide gas absorption test device. The nitrogen oxide gas absorption test device comprises a gas static mixer, an absorption tower, a high-level tank, a heat exchanger and a circulating pump, an inlet pipe of the gas static mixer is respectively connected with a nitrogen inlet pipe, an oxygen inlet pipe and a nitric oxide inlet pipe, and an outlet of the gas static mixer is connected with a gas inlet of the absorption tower; a lower joint of the absorption tower is connected with an inlet of the circulating pump through a liquid outlet; an outlet of the circulating pump is connected to a liquid inlet of the high-level tank; a heat exchanger is arranged in the high-level tank; the heat exchanger adjusts the temperature of the absorption liquid to control the temperature of the absorption tower; a liquid outlet pipe at the bottom of the high-level tank is connected to a liquid inlet in the upper part of the absorption tower through a sixth mass flowmeter; the joint at the upper part of the absorption tower is connected with a tail gas exhaust pipeline; and a detection pipeline, a pressure regulating valve and a stop valve are sequentially connected to the exhaust pipeline. The device disclosed by the utility model is used for absorbing tail gas of nitrogen oxides with different concentrations and analyzing the concentration of the nitrogen oxides through on-line monitoring.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical engineering and environmental protection field, concretely relates to a nitrogen oxide gas absorption model test device. BACKGROUND

[0002] In the process of chemical production and environmental protection, the treatment of nitrogen oxide tail gas is often involved, and in the treatment of nitrogen oxide tail gas, high-temperature tail gas is often treated by SCR, NSCR and other methods. For some low-temperature, low-concentration, unstable emission and concentration of nitrogen oxide tail gas, water absorption method is now used for treatment, and the advantages are that in the case of unstable nitrogen oxide tail gas, through the countercurrent water absorption process, the tail gas can still achieve standard discharge, and the nitrogen oxide is absorbed as dilute nitric acid, achieving the goal of resource treatment.

[0003] The water absorption process has many influencing factors, such as the composition of nitrogen oxide tail gas, absorption temperature, nitric acid concentration in absorption liquid, gas flow rate in countercurrent absorption process, gas-liquid ratio, absorption tower packing and other factors, which can affect the final absorption efficiency and production cost. Therefore, through the test, the best parameters of each influencing factor and the best engineering data of the overall absorption device are obtained, which is an urgent problem to be solved in the design of nitrogen oxide tail gas absorption device. SUMMARY

[0004] To solve the above problems, the application discloses a nitrogen oxide gas absorption model test device for absorption and treatment of nitrogen oxide tail gas of different concentrations, and the concentration of nitrogen oxide is analyzed online. The device can test the influence of different concentrations, different absorption liquids, temperature, pressure, flow rate, packing and other factors on the absorption rate by single factor method. Accurate engineering data is provided for the design of absorption reaction device.

[0005] A nitrogen oxide gas absorption model test device, comprising a gas static mixer, an absorption tower, a high-level tank, a heat exchanger and a circulating pump; the inlet pipe of the gas static mixer is connected with the nitrogen gas inlet pipe, the oxygen gas inlet pipe and the nitric oxide inlet pipe respectively, and the outlet of the gas static mixer is connected with the gas inlet of the absorption tower; the absorption tower is composed of an upper joint, a tower body and a lower joint connected by flanges; the lower joint is connected with the inlet of the circulating pump through the liquid outlet; the outlet of the circulating pump is connected with the liquid inlet of the high-level tank; wherein the high-level tank is provided with a heat exchanger inside; the absorption liquid temperature is adjusted through the heat exchanger to control the absorption tower temperature; the liquid outlet pipe at the bottom of the high-level tank is connected with the liquid inlet of the upper part of the absorption tower through the sixth mass flow meter; the absorption liquid inflow is controlled.

[0006] The outer exhaust pipeline is connected with a detection pipeline, a pressure regulating valve and a stop valve in sequence; the detection pipeline is sequentially provided with a fifth mass flow meter and a nitrogen oxide online monitor; a regulating pipeline is connected between the fifth mass flow meter and the carbide online monitor; a fourth mass flow meter is arranged on the regulating pipeline, and the other end of the fourth mass flow meter is connected with a nitrogen gas inlet pipe.

[0007] By adjusting and controlling the proportion of the fourth and fifth mass flow meters, the dilution multiple of the measured gas can be controlled, the measurement range is expanded, and different experimental conditions can be adapted.

[0008] Further, a pressure balance pipeline is arranged between the absorption tower and the high-level tank, so that the absorption liquid in the high-level tank can flow into the absorption tower stably by using the height difference.

[0009] Further, the absorption tower and the high-level tank are both provided with thermometers.

[0010] Further, the absorption tower is provided with a plate sight glass on the side of the lower joint.

[0011] Further, the tower body of the absorption tower is internally provided with a filler; and the filler is ceramic structured filler.

[0012] Further, the nitrogen gas inlet pipe is sequentially provided with a first pressure gauge and a first mass flow meter; the oxygen gas inlet pipe is sequentially provided with a second pressure gauge and a second mass flow meter; and the nitric oxide inlet pipe is sequentially provided with a third pressure gauge and a third mass flow meter; by adjusting and controlling the flow of each gas, the composition of the nitrogen oxide gas can be controlled.

[0013] The absorption tower has the advantages that the test is convenient, and accurate engineering data are provided for the design of the absorption reaction device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The result schematic view of the utility model.

[0015] LIST OF REFERENCE NUMBERS:

[0016] 1-absorption tower; 2-gas static mixer; 3-high-level tank; 4-heat exchanger; 5-circulating pump; 7-nitrogen gas inlet pipe; 8-oxygen gas inlet pipe; 9-nitric oxide inlet pipe; 10-outer exhaust pipeline; 11-detection pipeline; 12-nitrogen oxide online monitor; 13-regulating pipeline; 14-plate sight glass. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0018] like Figure 1 As shown, a nitrogen oxide gas absorption test device of this embodiment includes a gas static mixer 2, an absorption tower 1, a high-level tank 3, a heat exchanger 4 and a circulation pump 5; the inlet pipe of the gas static mixer 2 is connected to the nitrogen inlet pipe 7, the oxygen inlet pipe 8, and the nitric oxide inlet pipe 9 respectively, and the outlet of the gas static mixer 2 is connected to the air inlet of the absorption tower 1; the absorption tower 1 is composed of an upper joint, a tower body and a lower joint connected by flanges; the lower joint is connected to the inlet of the circulation pump 5 through the liquid outlet; the outlet of the circulation pump 5 is connected to the liquid inlet of the high-level tank 3; wherein A heat exchanger 4 is provided inside the high-level tank 3; the liquid outlet pipe at the bottom of the high-level tank 3 is connected to the liquid inlet at the top of the absorption tower 1 through a sixth mass flowmeter; an external exhaust gas pipeline 10 is connected to the upper joint of the absorption tower 1; a detection pipeline 11, a pressure regulating valve and a shut-off valve are connected to the external exhaust gas pipeline 10 in sequence; a fifth mass flowmeter and a nitrogen oxide online monitor 12 are provided on the detection pipeline 11 in sequence; a regulating pipeline 13 is connected between the fifth mass flowmeter and the nitrogen oxide online monitor 12; a fourth mass flowmeter is provided on the regulating pipeline 13, the other end of which is connected to the nitrogen inlet pipe 7.

[0019] By adjusting and controlling the ratio of the fourth and fifth flow meters, the dilution ratio of the measured gas can be controlled, the measurement range can be expanded, and different experimental conditions can be adapted.

[0020] The nitrogen inlet pipe 7 is provided with a first pressure gauge and a first mass flow meter in sequence; the oxygen inlet pipe 8 is provided with a second pressure gauge and a second mass flow meter in sequence; the nitric oxide inlet pipe 9 is provided with a third pressure gauge and a third mass flow meter in sequence; the composition of the nitrogen oxide gas can be controlled by adjusting and controlling the flow rate of each gas.

[0021] A pressure equalization pipe 15 is installed between the absorption tower 1 and the high-level tank 3; both the absorption tower 1 and the high-level tank 3 are equipped with thermometers. A plate-type sight glass 14 is installed on the side of the lower joint of the absorption tower 1. The tower body of the absorption tower 1 is filled with packing; the packing is selected from ceramic structured packing.

[0022] Sight glasses and liquid level gauges are installed in the high-level tank and absorption tower to observe the liquid level, and a drain port is provided at the lowest point of the system pipeline to facilitate cleaning of the device or replacement of the absorption liquid.

[0023] The embodiment connects the steel cylinder gas such as nitrogen, oxygen, nitrogen oxide and the like to the gas static mixer inlet through the pressure gauge and mass flow meter, connects the static mixer outlet to the lower gas inlet of the absorption tower, fills the ceramic structured packing in the absorption tower, and has the self-operated pressure regulating valve on the gas outlet pipeline at the top of the absorption tower to stabilize the absorption system pressure. The liquid outlet at the bottom of the absorption tower is connected to the inlet of the circulating pump, the outlet of the circulating pump is connected to the top inlet of the high-level tank, the heat exchanger in the high-level tank adjusts the absorption liquid temperature to control the absorption tower temperature, and the liquid outlet at the bottom of the high-level tank is connected to the upper liquid inlet of the absorption tower through the flow meter. The gas enters from the bottom inlet and is discharged from the top outlet, the absorption liquid flows from the upper liquid inlet to the bottom of the tower through the distributor, and the countercurrent absorption process is realized in the tower. The packing in the tower increases the gas-liquid contact area and improves the absorption efficiency.

[0024] wherein Figure 1 AT-remote nitrogen oxide online monitor; FT-remote mass flow meter; LG-liquid level meter; TG-thermometer; PG-pressure gauge.

[0025] The technical means disclosed in the technical scheme of the present application is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical scheme composed of any combination of the above technical features.

Claims

1. A nitrogen oxide gas absorption module test device, characterized by: The utility model relates to a kind of nitrogen oxide absorption device, including gas static mixer (2), absorption tower (1), high tank (3), heat exchanger (4) and circulating pump (5);The inlet pipe of the gas static mixer (2) is connected with nitrogen gas inlet pipe (7), oxygen inlet pipe (8), nitric oxide inlet pipe (9) respectively, and the outlet of the gas static mixer (2) is connected with the gas inlet of absorption tower (1);The absorption tower (1) is connected by flange by upper joint, tower body and lower joint three parts;Lower joint is connected with the inlet of circulating pump (5) by liquid outlet;The outlet of the circulating pump (5) is connected to the liquid inlet of high tank (3);Wherein the heat exchanger (4) is equipped in the high tank (3);Liquid outlet pipe in high tank (3) bottom is connected to the liquid inlet of absorption tower (1) upper portion by sixth mass flowmeter;The outer exhaust gas pipeline (10) is connected on the upper joint of the absorption tower (1);Outer exhaust gas pipeline (10) is sequentially connected with detection pipeline (11), pressure regulating valve and stop valve;Fifth mass flowmeter and nitrogen oxide on-line monitor (12) are sequentially equipped on the detection pipeline (11);Wherein fifth mass flowmeter and carbide on-line monitor (12) are connected with adjusting pipeline (13);Fourth mass flowmeter is equipped on adjusting pipeline (13), and its other end is connected with nitrogen gas inlet pipe (7).

2. A device for the absorption of nitrogen oxide gases according to claim 1, characterized in that: Pressure balance pipeline (15) is arranged between absorption tower (1) and high tank (3).

3. A device for the absorption of nitrogen oxide gases according to claim 1, characterized in that: Temperature meter is installed on the absorption tower (1) and high tank (3).

4. The device of claim 1, wherein: Plate sight glass (14) is arranged on the side of lower joint of the absorption tower (1).

5. The device of claim 1, wherein: The tower body of the absorption tower (1) is filled with packing, and the packing is ceramic structured packing.

6. A device for absorbing a nitric oxide gas according to claim 1, wherein: First pressure gauge and first mass flowmeter are sequentially arranged on the nitrogen gas inlet pipe (7), second pressure gauge and second mass flowmeter are sequentially arranged on the oxygen inlet pipe (8), and third pressure gauge and third mass flowmeter are sequentially arranged on the nitric oxide inlet pipe (9).

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