Evaporation storage tank for treating urea solutions with different concentrations

Abstract

The utility model belongs to an evaporation storage tank for treating urea solutions with different concentrations. Comprising a tank body and an end socket arranged at the top of the tank body, a baffle dividing the tank body into a first cavity and a second cavity which are independent is arranged in the tank body, a first urea solution inlet is formed in the top of the first cavity, and a second urea solution inlet is formed in the top of the second cavity; a communicating pipeline with a communicating valve is arranged at the bottoms of the first cavity and the second cavity, and a urea solution outlet is formed in one side of the second cavity; a first heat exchange coil pipe is arranged in the first cavity, and a second heat exchange coil pipe is arranged in the second cavity. The problem that biuret is easily generated due to non-uniform heating can be avoided, and meanwhile, the aims of saving steam consumption and improving evaporation and concentration efficiency can be achieved by aiming at a relatively small amount of evaporated and concentrated urea solution.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of urea evaporation tank, specifically a kind of evaporation storage tank for handling different concentration urea solution. BACKGROUND

[0002] Different concentrations of urea solution are generated in urea production process and start-stop stage, and the above different concentrations of urea solution cannot be directly discharged, and needs to be concentrated again to return to system to participate in production again.The conventional operation mode is to send different concentrations of urea solution to the same evaporation storage tank, and to evaporate and concentrate uniformly to meet the demand of returning to system again;The above-mentioned mode has the following problems: the process of heating needs to heat different concentrations of urea solution together, not only consumes a lot of steam, and heating time is too long to produce biuret, which affects product quality. INVENTION CONTENTS

[0003] In order to make up for the above shortcomings, the utility model provides an evaporation storage tank for handling different concentration urea solution to solve the technical problems existing in the prior art.

[0004] The utility model solves the technical problems thereof by adopting the technical scheme of:

[0005] An evaporation storage tank for handling different concentration urea solution, the evaporation storage tank includes tank body and head arranged at the top of tank body, the inside of tank body is provided with baffle for dividing tank body into independent first cavity and second cavity, the top of first cavity is provided with first urea solution inlet, the top of second cavity is provided with second urea solution inlet, the bottom of first cavity and second cavity is provided with communication pipeline with communication valve, one side of second cavity is provided with urea solution outlet;The inside of first cavity is provided with first heat exchange coil, and the inside of second cavity is provided with second heat exchange coil.

[0006] The utility model has the advantages that: the utility model is provided with tank body with first cavity and second cavity, can realize zoning of different concentrations of urea solution, place high-concentration urea solution in one cavity for heat preservation and storage, and place low-concentration urea solution in another cavity for heating and evaporation;When the concentrations of two kinds of urea solution are the same, the cavity for heat preservation and storage of urea solution can supply urea solution to subsequent section, and the communication valve is opened to make urea solution in another cavity enter subsequent section;The above-mentioned mode can realize continuous supply of urea solution to subsequent section, to avoid frequent opening of subsequent section, and can overcome the defects of uneven heating of urea solution, large steam consumption and long processing time.

[0007] Preferably, the volume of the first cavity is smaller than the volume of the second cavity.

[0008] Preferably, the first urea solution inlet is provided with a first inner extension urea inlet pipeline which penetrates the head and has an outlet arranged at the lower part of the first cavity; the second urea solution inlet is provided with a second inner extension urea inlet pipeline which penetrates the head and has an outlet arranged at the lower part of the second cavity.

[0009] Preferably, the first cavity is provided with a first urea concentration meter and the second cavity is provided with a second urea concentration meter.

[0010] Preferably, the top of the first cavity and the second cavity is open, and the head is provided with a non-condensable gas exhaust.

[0011] Preferably, the first cavity is provided with a first liquid level meter and a first temperature sensor, and the second cavity is provided with a second liquid level meter and a second temperature sensor.

[0012] Preferably, the first cavity is provided with a first manhole and the second cavity is provided with a second manhole.

[0013] Preferably, the top of the first heat exchange coil is provided with a first steam inlet, and the bottom of the first heat exchange coil is provided with a first condensate outlet; the top of the second heat exchange coil is provided with a second steam inlet, and the bottom of the second heat exchange coil is provided with a second condensate outlet.

[0014] Preferably, the lower part of the first cavity is provided with a first blowdown port, and the lower part of the second cavity is provided with a second blowdown port.

[0015] The evaporative storage tank for treating urea solutions with different concentrations prepared according to the above technical scheme can realize the purpose of partitioned storage and treatment of different urea solutions, thereby reducing biuret generation, reducing steam consumption and improving treatment efficiency; specifically, the urea solution with high solubility can be placed in the second cavity for mainly heat preservation and storage, and the urea solution with low solubility can be placed in the first cavity for mainly evaporation and heating; when the solubilities of the two are consistent, the urea solution in the second cavity is returned to the system first, and then the communication valve is opened to make the urea solution in the first cavity return to the system through the second cavity; the above process can ensure that the urea solution with high solubility is not lower than the crystallization temperature of the solution without generating biuret, and by heating the urea solution with low solubility, the required concentration can be reached under the premise of reducing steam consumption; at the same time, the non-condensable gas generated in the heat preservation and evaporation processes is discharged through the shared non-condensable gas exhaust, and the urea concentration meter, liquid level meter and temperature sensor are used to observe the condition of the urea solution, so as to improve the product quality under the premise of recovering the urea solution. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described in the following are only some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0017] Fig. 1 It is an internal structure schematic view of the present application.

[0018] Fig. 2 It is a front structure schematic view of the present application.

[0019] Fig. 3 It is a top view structure schematic view of the upper part in the present application.

[0020] In the figure: 1, tank body; 2, head; 3, baffle; 4, first cavity; 5, second cavity; 6, communication valve; 7, urea solution outlet; 8, first heat exchange coil; 9, second heat exchange coil; 10, communication pipeline; 11, first inner extension urea inlet pipeline; 12, second inner extension urea inlet pipeline; 13, first urea concentration meter; 14, second urea concentration meter; 15, non-condensable gas exhaust; 16, first liquid level meter; 17, first temperature sensor; 18, second liquid level meter; 19, second temperature sensor; 20, first manhole; 21, second manhole; 22, first steam inlet; 23, first condensate outlet; 24, second steam inlet; 25, second condensate outlet; 26, first blowdown; 27, second blowdown. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0022] The following will be described in combination with the drawings in the embodiments of the present application. Figs. 1-3Further detailed description of the present application, the utility model relates to a kind of for processing different concentration urea solution evaporative tank, the evaporative tank includes tank body 1 and the head 2 of being arranged at the top of tank body 1, the inside of the tank body 1 is equipped with the baffle 3 for the tank body 1 is divided into independent first cavity 4 and second cavity 5, the top of first cavity 4 is equipped with first urea solution inlet, the top of second cavity 5 is equipped with second urea solution inlet, the bottom of first cavity 4 and second cavity 5 is equipped with the communication pipeline 10 with communication valve 6, one side of second cavity 5 is equipped with urea solution outlet 7;The inside of the first cavity 4 is equipped with first heat exchange coil 8, and the inside of second cavity 5 is equipped with second heat exchange coil 9.Urea production process and start-stop stage can produce urea solution of different concentrations, to avoid subsequent system frequent start-stop, most enterprises are different concentration urea solution together into evaporative tank to carry out unified evaporation concentration, this process not only consumes large amount of steam, evaporation concentration efficiency is low, while also easy to generate biuret, thereby affecting the quality of subsequent product;Based on this, the utility model is provided with the tank body 1 including first cavity 4 and second cavity 5 for storing urea of different concentrations, according to the different solubility of urea is processed specifically, make first cavity 4 as low concentration urea solution evaporation concentration cavity, make second cavity 5 as high concentration urea solution heat preservation cavity, when the concentration of both is same, can make the urea solution in first cavity 4 enter second cavity 5 through the communication pipeline with communication valve 6, while make the urea solution in second cavity supply urea solution to subsequent section, the above-mentioned process can avoid the problem of biuret due to long heating time, while the amount of urea solution for evaporation concentration is relatively small, so steam consumption can be saved and the efficiency of evaporation concentration is improved.

[0023] Further, the volume of the first cavity 4 is less than the volume of the second cavity 5. In the utility model, the first cavity 4 is used for evaporation concentration of low concentration urea solution, and the second cavity 5 is used for heat preservation of high concentration urea solution and receiving urea solution after evaporation concentration, so that when the urea solution in the first cavity 4 enters the second cavity 5 in the subsequent process, there is enough storage space in the second cavity 5. At the same time, the small volume of the first cavity 4 is conducive to energy saving.

[0024] Further, a first inner extension urea inlet pipeline 11 is arranged on the first urea solution inlet, the first inner extension urea inlet pipeline 11 penetrates the head 2, and the outlet is arranged at the lower part of the first cavity 4. A second inner extension urea inlet pipeline 12 is arranged on the second urea solution inlet, the second inner extension urea inlet pipeline 12 penetrates the head 2, and the outlet is arranged at the lower part of the second cavity 5. The above-mentioned arrangement not only can avoid splashing when the urea solution enters the corresponding cavity, but also is conducive to the disturbance of the urea solution inside, realizing the full mixing of the urea solution, so as to achieve uniform heat preservation or concentration of the urea solution without setting a power device.

[0025] Further, the first cavity 4 is provided with a first urea concentration meter 13, and the second cavity 5 is provided with a second urea concentration meter 14. Through the above-mentioned setting, the concentration of urea solution in the first cavity 4 and the second cavity 5 can be monitored.

[0026] Further, the top of the first cavity 4 and the second cavity 5 is respectively provided with a gas exhaust pipeline, which respectively communicates with a non-condensable gas exhaust port 15 provided at the top of the head 2.

[0027] Further, the first cavity 4 is provided with a first liquid level meter 16 and a first temperature sensor 17, and the second cavity 5 is provided with a second liquid level meter 18 and a second temperature sensor 19. Through the above-mentioned setting, the temperature and liquid level of urea solution in the first cavity 4 and the second cavity 5 can be monitored.

[0028] Further, the first cavity 4 is provided with a first manhole 20, and the second cavity 5 is provided with a second manhole 21. Through the above-mentioned setting, the first cavity 4 and the second cavity 5 can be conveniently overhauled.

[0029] Further, the top of the first heat exchange coil 8 is provided with a first steam inlet 22, and the bottom of the first heat exchange coil 8 is provided with a first condensate outlet 23; the top of the second heat exchange coil 9 is provided with a second steam inlet 24, and the bottom of the second heat exchange coil 9 is provided with a second condensate outlet 25.

[0030] Further, the lower part of the first cavity 4 is provided with a first blowdown port 26, and the lower part of the second cavity 5 is provided with a second blowdown port 27. When the first cavity 4 and the second cavity 5 need to be blown down, the blowdown can be realized through the corresponding blowdown port.

[0031] The specific working process of the utility model is as follows: different concentrations of urea solution are produced in the urea production process and the start-stop stage, the high-concentration urea solution enters the inner lower part of the second cavity 5 through the second inner-stretching urea inlet pipeline 12, and the urea solution is prevented from splashing and uniformly mixed; the low-concentration urea solution enters the inner lower part of the first cavity 4 through the first inner-stretching urea inlet pipeline 11, and the urea solution is also prevented from splashing and uniformly mixed; the first heat exchange coil 8 and the second heat exchange coil 9 are connected with steam when the urea solution enters the corresponding cavity, the second heat exchange coil 9 is mainly used for heat preservation of the high-concentration urea solution, so as to avoid the problem of urea precipitation caused by too low temperature, and the first heat exchange coil 8 is used for evaporation and concentration of the low-concentration urea solution, and the temperature rising rate of the low-concentration urea solution is detected through the corresponding first temperature sensor 17, so as to avoid the defect of biuret caused by too fast temperature rising; the temperature sensor, the urea concentration meter and the liquid level meter are used for real-time observation and monitoring of the change of the urea solution in the process of the foregoing evaporation and concentration and heat preservation, when the concentration of the urea solution in the first cavity 4 is same as the concentration of the urea solution in the second cavity 5, the communication valve 6 is opened, the urea solution in the second cavity 5 enters the subsequent process, the urea solution in the first cavity 4 enters the second cavity 5 through the communication pipeline 10 and then enters the subsequent process, the first cavity 4 and the second cavity 5 are adjacent in the above process, so that heat supply can be reduced, and the feature of further reducing steam loss is achieved; in addition, no power device such as solution conveying and urea solution stirring is used in the utility model, so that the features of further saving energy and reducing consumption can be achieved.

[0032] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and the description in the specification only illustrate the principle of the utility model, various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. An evaporation storage tank for processing urea solutions of different concentrations, characterized in that: The evaporation storage tank includes a tank body (1) and a head (2) disposed on the top of the tank body (1). The tank (1) is provided with a baffle (3) that divides the tank (1) into an independent first chamber (4) and a second chamber (5). The top of the first chamber (4) is provided with a first urea solution inlet, the top of the second chamber (5) is provided with a second urea solution inlet, the bottom of the first chamber (4) and the second chamber (5) is provided with a connecting pipe (10) with a connecting valve (6), and a urea solution outlet (7) is provided on one side of the second chamber (5). The first cavity (4) is provided with a first heat exchange coil (8), and the second cavity (5) is provided with a second heat exchange coil (9).

2. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The volume of the first cavity (4) is smaller than the volume of the second cavity (5).

3. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The first urea solution inlet is provided with a first internal urea inlet pipe (11), which passes through the end cap (2) and has its outlet located at the lower part of the first cavity (4); The second urea solution inlet is provided with a second internal urea inlet pipe (12), which passes through the end cap (2) and has an outlet located at the lower part of the second cavity (5).

4. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The first cavity (4) is equipped with a first urea concentration meter (13), and the second cavity (5) is equipped with a second urea concentration meter (14).

5. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The top of the first cavity (4) and the second cavity (5) are open, and the end cap (2) is provided with a non-condensable gas exhaust port (15).

6. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The first cavity (4) is provided with a first liquid level gauge (16) and a first temperature sensor (17), and the second cavity (5) is provided with a second liquid level gauge (18) and a second temperature sensor (19).

7. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The first cavity (4) is provided with a first manhole (20), and the second cavity (5) is provided with a second manhole (21).

8. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The first heat exchange coil (8) is provided with a first steam inlet (22) at the top and a first condensate outlet (23) at the bottom. The second heat exchange coil (9) has a second steam inlet (24) at the top and a second condensate outlet (25) at the bottom.

9. An evaporation storage tank for processing urea solutions of different concentrations according to claim 1, characterized in that: The lower part of the first cavity (4) is provided with a first drain outlet (26), and the lower part of the second cavity (5) is provided with a second drain outlet (27).

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