CN218238978U

CN218238978U - Measure device of wet flue gas desulfurization absorption tower thick liquid level and density

Info

Publication number: CN218238978U
Application number: CN202222435884.6U
Authority: CN
Inventors: 赵俊骅
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-01-06
Anticipated expiration: 2032-09-15

Abstract

The utility model belongs to the technical field of wet flue gas desulfurization operation monitoring facilities, concrete technical scheme is: a device for measuring the liquid level and density of slurry in a wet desulphurization absorption tower comprises a tower body, wherein an outlet flue is arranged at the top of the tower body, a spraying layer and an oxidation air pipe are arranged in the tower body, an air outlet of the oxidation air pipe extends to the inside of the tower body, a first pressure transmitter and a second pressure transmitter are arranged on the inner wall of the tower body, the first pressure transmitter is arranged below the air outlet of the oxidation air pipe, the second pressure transmitter is arranged below slurry foam in the tower body, the height difference of the first pressure transmitter and the second pressure transmitter is greater than 6 meters, the height difference of the first pressure transmitter and the second pressure transmitter accounts for more than two thirds of the depth of the slurry in the tower body, the slurry pressures of different positions in the tower body are monitored in real time through the two pressure transmitters, the real-time monitoring of the liquid level of the slurry can be realized through reasonable operation logic, the actual slurry level monitoring data of the slurry is accurate, and the method can be widely popularized and applied.

Description

Measure device of wet flue gas desulfurization absorption tower thick liquid level and density

Technical Field

The utility model belongs to the technical field of wet flue gas desulfurization operation monitoring facilities, concretely relates to be applied to instrument of thick liquid level and density in measuring the absorption tower.

Background

The absorption tower is used as a core reaction site of a wet desulphurization process, the monitoring of the liquid level and the density of the slurry in the absorption tower by daily operators at present is realized mainly by a liquid level meter and a density meter, and the accurate judgment and adjustment of the liquid level and the density are important means for ensuring the desulphurization efficiency, the safe operation of a desulphurization system and the quality of the slurry and gypsum.

In the daily operation process, slurry in an absorption tower often foams due to various additional factors, the actual liquid level of the foamed slurry = the liquid level of the slurry plus the foam thickness, the existing liquid level can only be judged by a liquid level meter, the display value of the liquid level meter of the foamed slurry is lower than that of the actual liquid level, if an operator only uses the liquid level meter as the actual liquid level adjustment of the slurry, the foamed slurry is easy to overflow to the outside of the absorption tower, if an overflow pipe breaks a siphon port and is blocked, the slurry can overflow in a large area, an environmental protection event is caused, the slurry can enter a flue due to serious slurry overflow, the corrosion and corrosion of the flue are caused, and even a generator set is stopped due to the damage of a draught fan blade and the like; if the actual liquid level of the slurry after foaming is considered by operating personnel to be higher than the apparent liquid level of a liquid level meter, in order to prevent slurry foaming overflow and seriously reduce the operating liquid level of the absorption tower, the operation can reduce the oxidation reaction space, so that the calcium sulfite hemihydrate in the gypsum is increased, the quality of the gypsum is influenced, the slurry poisoning dehydration difficulty is also caused, and the stable operation of a desulfurization system is influenced.

The measurement of absorption tower density also only relies on installing at absorption tower bottom densimeter to realize, but the actual thick liquid of operation is because of the crystallization of gypsum, the density of bottom thick liquid must be bigger than actual operation density partially, simultaneously because of thick liquid receives the continuous disturbance of slurry circulating pump, oxidation fan, agitator in the absorption tower, the density measurement of thick liquid is very big with actual density deviation, again because the thick liquid is limestone solution, increase the wearing and tearing of densimeter, the inaccurate problem of density measurement has more aggravated like this.

Currently, most of absorption tower level meter measurements are calculated according to a single slurry pressure (a pressure transmitter) and a density meter (a density transmitter), and the operation logic formula is as follows:

h = P/(ρ g) + H, ρ is density measured by a density transmitter, but in actual operation, ρ is the measured density of the slurry taken from the bottom, and the operation density is higher than the bottom measured density due to the influence of factors such as oxidizing wind, foaming and the like; generally, under the condition that the pressure transmitter is arranged on an oxidation air pipe and a foaming position, whether slurry foams or not has no influence on a pressure value P, so that the value P is an actual pressure value, g is the gravity acceleration, and h is the installation height of the pressure transmitter.

The liquid level calculated in this way is selected to be larger because of the density when the slurry is not foamed, then the liquid level is lower than the actual liquid level, when the slurry is foamed, the actual running density is smaller than the bottom slurry density, and then the liquid level is calculated to be aggravated along with the foaming of the slurry and is more inaccurate.

The inaccurate measurement of the current liquid level meter and the current densimeter causes the difficulty of controlling the liquid level of the absorption tower in daily operation to become operation adjustment, and the situations of slurry overflow, slurry poisoning and the like frequently occur due to the improper control of the liquid level.

SUMMERY OF THE UTILITY MODEL

The technical problem of the thick liquid level/density inaccurate, the unable accurate judgement actual thick liquid condition of operation personnel, the unable correct operation speed governing, the easy thick liquid poisoning or overflow that exists for solving current absorption tower level gauge, the utility model provides a device of accurate measurement absorption tower thick liquid level and density measurement provides accurate reliable foundation for the accurate judgement thick liquid level of operation personnel and density condition.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a measure device of wet flue desulfurization absorption tower thick liquid level and density, includes the tower body, and the top of tower body is equipped with the export flue, links to each other through last expansion joint between export flue and the tower body, increases the stability of being connected of export flue and tower body through last expansion joint.

The spray layer is arranged in the tower body, the spray layer is arranged on the upper portion of the tower body, the spray layer is connected with one end of the outlet pipeline of the slurry circulating pump, the other end of the outlet pipeline of the slurry circulating pump extends out of the tower body, the outlet pipeline of the slurry circulating pump is arranged at the extension end of the outlet pipeline of the slurry circulating pump, and liquid is uniformly distributed on the cross section of the tower through the spray layer, so that the high-efficiency absorption of the tower body is ensured.

The tower body is internally provided with an oxidation air pipe, an air outlet of the oxidation air pipe extends to the inside of the tower body, an air outlet of the oxidation air pipe is arranged downwards, a pipeline in the tower body is arranged in the oxidation air pipe and vertically extends downwards, an air inlet of the oxidation air pipe is arranged outside the tower body, and oxygen is supplied to the slurry in the tower body through the oxidation air pipe to accelerate the forced oxidation rate.

The bottom of the tower body is provided with a gypsum discharge pump, and the gypsum discharge pump is connected with the tower body through a rubber lining pipeline.

The inner wall of the tower body is provided with a first pressure transmitter which is arranged at the lower part of the tower body, and the first pressure transmitter is arranged below the air outlet of the oxidation air pipe and is close to the bottom of the tower body of the absorption tower.

And a second pressure transmitter is arranged on the inner wall of the tower body, is arranged on the upper part of the tower body and is arranged below the slurry foam in the tower body, and is close to the top of the tower body of the absorption tower.

Preferably, the height difference between the first pressure transmitter and the second pressure transmitter is greater than 6 meters, the height difference between the first pressure transmitter and the second pressure transmitter accounts for more than two thirds of the depth of the slurry in the tower body, the actual operation density of the slurry can be correctly reflected through the first pressure transmitter and the second pressure transmitter, and further the actual liquid level of the slurry can be correctly reflected.

Compared with the prior art, the utility model, specifically beneficial effect embodies: the utility model discloses a set up first pressure transmitter and second pressure transmitter in the tower body, first pressure transmitter accounts for more than two-thirds of the internal thick liquid degree of depth of tower with second pressure transmitter's difference in height, through the thick liquid pressure of two internal different positions of pressure transmitter real-time supervision tower, can realize the real-time supervision of thick liquid level through reasonable arithmetic logic, the inaccurate difficult problem of thick liquid densimeter measurement has been solved, directly judge the thick liquid level to the operating personnel, density and thick liquid quality have very big help, can extensively popularize and apply.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure, 1 is a tower body, 2 is an outlet flue, 3 is a spraying layer, 4 is a slurry circulating pump outlet pipeline, 5 is an oxidation air pipe, 6 is a gypsum discharge pump, 7 is a first pressure transmitter, and 8 is a second pressure transmitter.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in figure 1, the device for measuring the liquid level and the density of the slurry of the wet desulphurization absorption tower comprises a tower body 1, wherein an outlet flue 2 is arranged at the top of the tower body 1, the outlet flue 2 is connected with the tower body 1 through an upper expansion joint, and the connection stability of the outlet flue 2 and the tower body 1 is improved through the upper expansion joint.

The spray layer 3 is arranged in the tower body 1, the spray layer 3 is arranged on the upper portion of the tower body 1, the spray layer 3 is connected with one end of the slurry circulating pump outlet pipeline 4, the other end of the slurry circulating pump outlet pipeline 4 extends out of the tower body 1, and liquid is uniformly distributed on the cross section of the tower through the spray layer 3, so that high-efficiency absorption of the tower body 1 is guaranteed.

The oxidation air pipe 5 is arranged in the tower body 1, the air outlet of the oxidation air pipe 5 extends to the inside of the tower body 1, the air outlet of the oxidation air pipe 5 is arranged downwards, the oxidation air pipe 5 is arranged in the tower body 1, the pipeline extends downwards vertically, the air inlet of the oxidation air pipe 5 is arranged outside the tower body 1, and oxygen is supplied to the slurry in the tower body 1 through the oxidation air pipe 5 to accelerate the oxidation rate.

The bottom of tower body 1 is equipped with gypsum discharge pump 6, links to each other through the lower lining glue pipe between gypsum discharge pump 6 and the tower body 1, is equipped with first pressure transmitter 7 and second pressure transmitter 8 on the inner wall of tower body 1.

During actual liquid level and density measurement, two pressure transmitters with different positions are combined with a formula H = P/(rho g) + H, so that the accuracy of a new measuring device is influenced by the installation position of a pressure transmitter meter and the values of P and rho in the formula, if the density of the slurry at the pressure transmitter is only selected, the actual running density of the slurry cannot be correctly reflected, and if the density of the slurry at the pressure transmitter is only selected, the actual running density of the slurry cannot be correctly reflected.

Therefore, ρ can be found by ρ = (P1-P2)/H21/g), and the density ρ here reflects the operating density of the slurry between the two pressure transmitters. In the formula, P1 is the measurement pressure of the first pressure transmitter 7, P2 is the measurement pressure of the second pressure transmitter 8, H21 is the height difference between the first pressure transmitter 7 and the second pressure transmitter 8, and g is the acceleration due to gravity.

If the density rho obtained by the calculation of the formula is used as the density of the slurry in the absorption tower, the installation positions of two level meters can be selected as large as possible, but P1 needs to be below the oxidation air pipe 5 and close to the bottom of the absorption tower, and P2 is close to the highest liquid level, but needs to be below the slurry foam, hactual = H1+ P1/(P1-P2) × H21/g, in the formula, H1 is the height of the first pressure transmitter 7, and according to the analysis of the formula, the values of P1 and P2 are not influenced no matter the slurry foams or not, and because the position difference of the two pressure transmitters is at least more than six meters and occupies more than two thirds of the actual slurry liquid level, the actual operation density of the slurry can be basically and accurately reflected, and further the actual liquid level of the slurry can be correctly reflected by the formula. The real liquid level can be displayed by uploading the measured data of the two pressure transmitters and then carrying out logical operation by the formula, and meanwhile, the running density of the slurry can be calculated by the pressure values of the two pressure transmitters, so that the problems of single position of the densimeter, slurry disturbance of a circulating pump and the like of the slurry of the absorption tower and inaccurate measurement are solved.

The foregoing is considered as illustrative and exemplary embodiments of the invention, and is not to be construed as limiting the invention, which is intended to be broadly construed as the invention in any manner, including any variations, equivalents and modifications within the spirit and scope of the invention.

Claims

1. A device for measuring the liquid level and the density of slurry in a wet desulphurization absorption tower is characterized by comprising a hollow tower body (1), wherein an outlet flue (2) is arranged at the top of the tower body (1), and the outlet flue (2) is connected with the tower body (1) through an upper expansion joint;

the tower is characterized in that a spraying layer (3) is arranged in the tower body (1), the spraying layer (3) is arranged at the upper part of the tower body (1), the spraying layer (3) is connected with one end of an outlet pipeline (4) of the slurry circulating pump, and the other end of the outlet pipeline (4) of the slurry circulating pump extends to the outside of the tower body (1);

an oxidation air pipe (5) is arranged in the tower body (1), an air outlet of the oxidation air pipe (5) extends to the inside of the tower body (1), an air outlet of the oxidation air pipe (5) is arranged downwards, a pipeline in the tower body (1) in which the oxidation air pipe (5) is arranged vertically extends downwards, and an air inlet of the oxidation air pipe (5) is arranged outside the tower body (1);

a gypsum discharge pump (6) is arranged at the bottom of the tower body (1), and the gypsum discharge pump (6) is connected with the tower body (1) through a lower expansion joint;

the inner wall of the tower body (1) is provided with a first pressure transmitter (7), the first pressure transmitter (7) is arranged at the lower part of the tower body (1), and the first pressure transmitter (7) is arranged below the air outlet of the oxidation air pipe (5);

the inner wall of the tower body (1) is provided with a second pressure transmitter (8), the second pressure transmitter (8) is arranged at the upper part of the tower body (1), and the second pressure transmitter (8) is arranged below the slurry foam in the tower body (1);

the height difference between the first pressure transmitter (7) and the second pressure transmitter (8) is larger than 6 meters.

2. The device for measuring the slurry level and the slurry density of the wet desulphurization absorption tower according to claim 1, wherein the height difference between the first pressure transmitter (7) and the second pressure transmitter (8) accounts for more than two thirds of the slurry depth in the tower body (1).