Device and method for testing purification performance of polyethylene glycol dimethyl ether solution

Abstract

The invention provides a device and a method for testing the purification performance of a polyethylene glycol dimethyl ether solution, and belongs to the field of gas purification. The device provided by the invention comprises a gas source system used for providing simulated coal gas; the mass flow meter is connected with the gas source system and is used for controlling the flow velocity of the simulated coal gas; the absorption reactor is connected with the mass flow meter and is used for containing a polyethylene glycol dimethyl ether solution to be detected; the tail gas collection and analysis system is connected with the absorption reactor and is used for collecting and analyzing components of the tail gas treated by the absorption reactor; the temperature control system is used for controlling the temperature of the polyethylene glycol dimethyl ether solution in the absorption reactor. The device provided by the invention can simulate the real contact state and key parameters of gas and liquid phases in an industrial tower, can provide a device and a method for rapidly evaluating the desulfurization performance of ethylene glycol dimethyl ether obtained by purchasing, production and laboratory preparation for enterprises, and provides basic data for purchasing and production of the enterprises.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal gas purification, in particular to a device and method for testing the purification performance of polyethylene glycol dimethyl ether solution. BACKGROUND

[0002] Polyethylene glycol dimethyl ether (NHD) solution is an excellent physical absorption solvent, which has high solubility and high selectivity for acid gases (such as H2S, CO2) in coal gas, and has the advantages of non-toxicity, biodegradability, easy regeneration, simple process, etc. It is widely used in desulfurization and decarburization.

[0003] The performance of NHD solution directly determines the operation efficiency and economic benefit of industrial desulfurization and decarburization devices. Whether it is the user (purchaser), production enterprise or research institution of NHD solution, a method is needed to quickly, accurately and reliably evaluate the purification performance in the laboratory. However, there is no existing device to simulate the real contact state and key parameters (such as residence time) of gas-liquid two-phase in industrial tower, which leads to the inability of enterprises to quickly evaluate the desulfurization and decarburization performance of coal gas purifying agents in the process of production and procurement. SUMMARY

[0004] The present application provides a device and method for testing the purification performance of polyethylene glycol dimethyl ether solution. The device can provide a quick evaluation of the purification performance of coal gas purifying agents (polyethylene glycol dimethyl ether) obtained by procurement, production and laboratory preparation, and provide basic data for enterprise procurement and production.

[0005] The present application provides a device for testing the purification performance of polyethylene glycol dimethyl ether solution, which comprises a gas source system for providing simulated coal gas; A mass flow meter connected to the gas source system for controlling the flow rate of the simulated coal gas; An absorption reactor connected to the mass flow meter for simulating an industrial desulfurization device or an industrial decarburization device containing the polyethylene glycol dimethyl ether solution to be tested; A tail gas collection and analysis system connected to the absorption reactor for collecting and analyzing the composition of the tail gas treated by the absorption reactor; Further comprising a temperature control system for controlling the temperature of the polyethylene glycol dimethyl ether solution in the absorption reactor.

[0006] Preferably, the absorption reactor is a closed container with the inlet at the bottom and the outlet at the top.

[0007] Preferably, the absorption reactor is a Monns washing bottle.

[0008] Preferably, the tail gas collection and analysis system comprises a gas chromatograph and a computer workstation.

[0009] The application further provides a method for testing the purification performance of a polyethylene glycol dimethyl ether solution, which is performed in the device and comprises the following steps: The simulated coal gas in the gas source system enters the absorption reactor through a mass flow meter to absorb the target gas in the simulated coal gas, and then the obtained tail gas is introduced into a tail gas collection and analysis system for analysis to obtain the concentration of the target gas in the tail gas; the absorption reactor contains the polyethylene glycol dimethyl ether solution to be tested; The purification performance is calculated according to the concentration of the target gas in the simulated coal gas and the concentration of the target gas in the tail gas; The absorption time is the residence time of the desulfurization coal gas in the polyethylene glycol dimethyl ether solution of the industrial desulfurization device or the residence time of the decarburization coal gas in the polyethylene glycol dimethyl ether solution of the industrial decarburization device.

[0010] Preferably, the simulated coal gas is a mixed gas of H2S and balance gas or a mixed gas of CO2 and balance gas; the balance gas comprises nitrogen or argon; The concentration of H2S in the mixed gas of H2S and balance gas is 1000-5000 ppm; the volume concentration of CO2 in the mixed gas of CO2 and balance gas is 10-30%.

[0011] Preferably, when the target gas is H2S, the absorption temperature is ≤50℃; When the target gas is CO2, the absorption temperature is ≤10℃.

[0012] The device provided by the application can simulate the real contact state and key parameters (residence time) of gas-liquid two-phase in an industrial tower, thereby providing an enterprise with a rapid evaluation of the purification performance of a coal gas purifying agent (polyethylene glycol dimethyl ether) obtained through purchase, production and laboratory preparation, and providing basic data for enterprise purchase and production.

[0013] The device provided by the application has simple structure, low cost and convenient operation, and can simultaneously investigate the influence of factors such as temperature, gas composition and NHD solution composition on the purification effect.

[0014] The method of the application takes the principle of “equal gas residence time” as the core, establishes a correlation model between a laboratory small reactor and an industrial large desulfurization tower, and solves the problem that the laboratory evaluation result cannot accurately reflect the industrial actual performance.

[0015] The application has wide application scenarios and can be used for: quality inspection of purchased products by an NHD solution user; quality control and performance verification of products by an NHD production enterprise; and rapid screening and evaluation of the performance of NHD solutions synthesized by new formulas or processes by a research institution, thereby effectively reducing the operating cost and research and development risk of enterprises and realizing cost reduction and benefit increase. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the desulfurization performance testing device described in this invention. Detailed Implementation

[0017] This invention provides an apparatus for testing the purification performance of polyethylene glycol dimethyl ether solution, including a gas source system for providing simulated coal gas; A mass flow meter connected to the gas source system is used to control the flow rate of the simulated coal gas; The absorption reactor connected to the mass flow meter is used to simulate an industrial desulfurization or decarbonization device to hold the polyethylene glycol dimethyl ether solution to be tested. A tail gas collection and analysis system connected to the absorption reactor is used to collect and analyze the components of the tail gas after it has been treated by the absorption reactor. It also includes a temperature control system for controlling the temperature of the polyethylene glycol dimethyl ether solution inside the absorption reactor.

[0018] The device provided by the present invention includes a gas source system for providing simulated coal gas.

[0019] The device provided by this invention includes a mass flow meter connected to the gas source system for controlling the flow rate of the simulated coal gas. The flow rate of the simulated coal gas is determined based on the coal gas flow rate in the desulfurization and decarbonization towers and the inner diameter of the desulfurization and decarbonization towers.

[0020] The apparatus provided by this invention includes an absorption reactor connected to the mass flow meter for holding the polyethylene glycol dimethyl ether solution to be tested. In one embodiment of this invention, the absorption reactor is a bottom-in, top-out closed container. In another embodiment of this invention, the absorption reactor is a Mondl wash bottle.

[0021] The device provided by the present invention also includes a temperature control system for controlling the temperature of the polyethylene glycol dimethyl ether solution in the absorption reactor.

[0022] The apparatus provided by this invention includes a tail gas collection and analysis system connected to the absorption reactor, used to collect and analyze the components of the tail gas after treatment by the absorption reactor. In one embodiment of this invention, the tail gas collection and analysis system includes a gas chromatograph and a computer workstation.

[0023] This invention also provides a method for testing the purification performance of polyethylene glycol dimethyl ether solution in an industrial desulfurization or decarbonization device, which is carried out in the apparatus described in the above technical solution and includes the following steps: The simulated coal gas in the gas source system enters an absorption reactor through a mass flow meter to absorb a target gas in the simulated coal gas, and then the obtained tail gas is introduced into a tail gas collection and analysis system for analysis to obtain the concentration of the target gas in the tail gas. The purification performance is calculated according to the concentration of the target gas in the simulated coal gas and the concentration of the target gas in the tail gas. The absorption time is the residence time of the desulfurization coal gas in the polyethylene glycol dimethyl ether solution of the industrial desulfurization device or the residence time of the decarburization coal gas in the polyethylene glycol dimethyl ether solution of the industrial decarburization device.

[0024] The simulated coal gas in the gas source system enters an absorption reactor through a mass flow meter to absorb a target gas in the simulated coal gas, and then the obtained tail gas is introduced into a tail gas collection and analysis system for analysis to obtain the concentration of the target gas in the tail gas.

[0025] In the present application, the simulated coal gas is a mixed gas of H2S and balance gas or a mixed gas of CO2 and N2; the concentration of H2S in the mixed gas of H2S and balance gas is preferably 1000-5000 ppm, and in specific embodiments of the present application, can be 1500 ppm, 2000 ppm, 2500 ppm, 3000 ppm, 3500 ppm, 4000 ppm or 4500 ppm; the concentration of CO2 in the mixed gas of CO2 and balance gas is preferably 10-30%, and in specific embodiments of the present application, can be 15%, 20% or 25%.

[0026] In the present application, when the target gas is H2S, the absorption temperature is preferably ≤50℃, and in specific embodiments of the present application, can be 10℃, 20℃, 30℃ or 40℃; when the target gas is CO2, the absorption temperature is preferably ≤10℃, and in specific embodiments of the present application, can be 2℃, 4℃, 5℃, 6℃ or 8℃; the absorption time is the residence time of the desulfurization coal gas in the polyethylene glycol dimethyl ether solution of the industrial desulfurization device or the residence time of the decarburization coal gas in the polyethylene glycol dimethyl ether solution of the industrial desulfurization device.

[0027] After obtaining the concentration of the target gas in the tail gas, the purification performance is calculated according to the concentration of the target gas in the simulated coal gas and the concentration of the target gas in the tail gas.

[0028] The formula for calculating the purification performance (η) is:

[0029] In the formula: η is the purification performance (desulfurization rate or decarburization rate), %; C 吸收前concentration of H2S or CO2 in the simulated gas before absorption, ppm or % C 吸收后 concentration of H2S or CO2 in the tail gas after absorption, ppm or % The device and method for evaluating the purification properties of polyethylene glycol dimethyl ether solution provided by the present application will be described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.

[0030] Example 1 (1) The gas flow rate in an industrial desulfurization tower was determined to be 0.8 m / s, and the tower diameter was 3 m. The gas residence time was calculated to be 12 seconds. A Meng's washing bottle was used as a reactor in the laboratory, and the inner diameter of the liquid part was 4 cm. The required simulated gas flow rate was calculated to be 15 mL / min.

[0031] (2) 100 mL of NHD solution purchased was added to the Meng's washing bottle, and placed in a 25℃ constant temperature water bath.

[0032] (3) The mass flow meter was adjusted to 15 mL / min, and H2S / N2 mixed gas with a H2S concentration of 2000 ppm was introduced into the reactor, and the aeration time was 30 min.

[0033] (4) The tail gas was collected with a gas bag, and the H2S concentration was analyzed using a gas chromatograph equipped with an FPD detector. The measured inlet concentration was 2000 ppm, and the tail gas concentration was 50 ppm.

[0034] (5) The desulfurization rate was calculated: η = (1-50 / 2000) 100%=97.5%. The results show that the desulfurization performance of this batch of purchased NHD solution is excellent.

[0035] Example 2 Investigation of the effect of temperature on the decarburization performance of laboratory-synthesized NHD solution (1) Based on the same industrial residence time calculation, the simulated gas (20% CO2 / N2) flow rate was set to 18 mL / min.

[0036] (2) Repeat the steps of Example 1 at different temperatures (10℃, 5℃, 0℃) to test the CO2 absorption rate of the newly synthesized NHD solution in the laboratory.

[0037] (3) The results show that the solution has the highest decarburization efficiency at low temperature (0℃), which provides the best process parameters for laboratory research.

[0038] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. An apparatus for testing the purification performance of a polyethylene glycol dimethyl ether solution, characterized by, The device comprises a gas source system for providing simulated coal gas; a mass flow meter connected to the gas source system for controlling the flow rate of the simulated coal gas; an absorption reactor connected to the mass flow meter for containing polyethylene glycol dimethyl ether solution to be tested in the simulated industrial desulfurization device or industrial decarburization device; a tail gas collection and analysis system connected to the absorption reactor for collecting and analyzing the composition of the tail gas after being treated by the absorption reactor; a temperature control system for controlling the temperature of the polyethylene glycol dimethyl ether solution in the absorption reactor.

2. The apparatus of claim 1, wherein, The absorption reactor is a closed container with the bottom inlet and the top outlet.

3. The apparatus of claim 1, wherein, The absorption reactor is a Monks washing bottle.

4. The apparatus of claim 1, wherein, The tail gas collection and analysis system comprises a gas chromatograph and a computer workstation.

5. A method of testing the purification performance of a polyethylene glycol dimethyl ether solution, characterized by, The device according to any one of claims 1-4 is used to perform the following steps: The simulated coal gas in the gas source system enters the absorption reactor through the mass flow meter to absorb the target gas in the simulated coal gas, and then the obtained tail gas is introduced into the tail gas collection and analysis system for analysis to obtain the concentration of the target gas in the tail gas; the absorption reactor contains polyethylene glycol dimethyl ether solution to be tested; The purification performance is calculated according to the concentration of the target gas in the simulated coal gas and the concentration of the target gas in the tail gas; The absorption time is the residence time of the desulfurized coal gas in the polyethylene glycol dimethyl ether solution of the industrial desulfurization device or the residence time of the decarburized coal gas in the polyethylene glycol dimethyl ether solution of the industrial decarburization device.

6. The method of claim 5, wherein, The simulated coal gas is a mixture of H2S and balance gas or a mixture of CO2 and balance gas; the balance gas comprises nitrogen or argon; The concentration of H2S in the mixture of H2S and balance gas is 1000-5000 ppm; the volume concentration of CO2 in the mixture of CO2 and balance gas is 10-30%.

7. The method of claim 5, wherein, When the target gas is H2S, the absorption temperature is ≤50℃; When the target gas is CO2, the absorption temperature is ≤10℃.

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