A urea production waste liquid treatment device

Abstract

The invention discloses a urea production waste liquid treatment device, comprising a waste liquid precipitation mechanism and a waste liquid treatment mechanism connected to each other. During use, the urea waste liquid is firstly precipitated through a primary precipitation component, so that the impurities with heavier weight in the waste liquid fall into the primary precipitation box, the waste liquid after the primary precipitation is discharged into the waste liquid precipitation box for further precipitation, the waste liquid at the top falls into the guide groove through the triangular groove, and is sent to the treatment barrel through the liquid receiving barrel and the guide pipe, after heating in the treatment barrel, the urea is decomposed into ammonia and carbon dioxide, and escapes together with the ammonia dissolved in the urea waste liquid, and is sent to the gas collection mechanism through the exhaust pipe for collection, so that the entire treatment device can realize effective treatment of the urea waste liquid during use, realize the reuse, harmless discharge and treatment of the urea waste liquid, and thus make the entire treatment device conducive to popularization and use.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection equipment, and in particular to a urea production waste liquid treatment device. Background Art

[0002] In my country, the industrial gas emissions from industries such as metallurgy, petrochemicals, fertilizers, and urban coal gasification are very large. With the increasing attention paid to environmental issues, my country officially implemented the "Emission Standards for Air Pollutants from Thermal Power Plants" in 2012, adjusted the emission concentration limits of air pollutants, and put forward more stringent requirements for enterprises that implement emissions. One of the important waste gases in industrial gases is flue gas nitrogen oxides. At present, among all the measures to control flue gas nitrogen oxide emissions, the selective catalytic reduction flue gas removal of nitrogen oxides is one of the flue gas purification technology methods. It is widely used in the field of flue gas denitrification due to its mature technology, high reliability and good applicability. In the main chemical reaction of the selective catalytic reduction flue gas denitrification technology, the reducing agent gas ammonia participating in the reaction is an important raw material. At present, liquid ammonia evaporation, ammonia water vaporization and other processes are mostly used to produce gas ammonia. However, since liquid ammonia is toxic and corrosive, and is easy to volatilize, there are great safety hazards. In addition, my country has special regulations on the transportation and storage of liquid ammonia or ammonia water, and the transportation and storage of ammonia raw materials must be strictly implemented in accordance with regulations.

[0003] Urea ammonia production process is divided into two ways: thermal ammonia production and hydrolysis ammonia production. At present, there are nearly 200 hydrolysis ammonia production projects in operation or about to be put into operation in China.

[0004] The hydrolysis ammonia production process is to continuously feed the configured 50wt% urea waste liquid into the hydrolyzer for decomposition, and the generated ammonia gas is sent to the denitrification reaction zone. Due to the water-insoluble matter, biuret and other salt impurities contained in industrial or agricultural urea, it is necessary to discharge the sewage regularly through the sewage pipeline on the hydrolyzer body, generally once a week at the bottom and surface. Failure to discharge sewage in time will affect the normal use of the hydrolyzer, thereby affecting the commissioning of the denitrification system. The urea waste liquid discharged from the hydrolyzer contains urea, ammonia, water-insoluble matter, biuret and other salts, which are high-ammonia wastewater and cannot be used or directly discharged into the environment.

[0005] Therefore, in order to treat the urea waste liquid discharged from the urea hydrolyzer, we proposed a urea waste liquid processor. Summary of the invention

[0006] The purpose of the present invention is to provide a urea production waste liquid treatment device to solve the above-mentioned problems.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention discloses a urea production waste liquid treatment device, comprising a waste liquid precipitation mechanism and a waste liquid treatment mechanism connected to each other;

[0009] The waste liquid sedimentation mechanism comprises a waste liquid sedimentation tank connected to a support frame, the bottom of the waste liquid sedimentation tank is in a constricted shape, and a first discharge assembly is connected to the bottom, the first discharge assembly is connected to the pre-treatment sedimentation collection mechanism, a discharge pipe is inserted into the interior of the waste liquid sedimentation tank, the other end of the discharge pipe is connected to the urea waste liquid source, the interior of the waste liquid sedimentation tank is connected to two guide grooves through a mounting assembly, one end of the guide groove close to the waste liquid treatment mechanism is connected to a liquid receiving bucket arranged in the top of the waste liquid sedimentation tank through a connecting pipe, the bottom of the liquid receiving bucket is connected to a guide pipe, the other end of the guide pipe is connected to the waste liquid treatment mechanism, the bottom of the bending part of the guide pipe is connected to a second discharge assembly, and the second discharge assembly is connected to the pre-treatment sedimentation collection mechanism;

[0010] The waste liquid treatment mechanism includes an insulation cylinder with a top seal and a treatment barrel fixed on the inner wall of the insulation cylinder. The bottom of the treatment barrel is funnel-shaped and is connected to a third discharge assembly. The third discharge assembly passes through the insulation cylinder and is connected to a treated sediment collection mechanism. A heater is installed on the outer wall of the insulation cylinder, and the heater is connected to a heating pipe installed on the inner wall of the bottom of the treatment barrel. A disc-shaped mounting groove is provided on the inner wall of the bottom of the treatment barrel, and the heating pipe is coiled on the mounting groove. Exhaust ports are provided on the tops of the insulation cylinder and the treatment barrel, and an exhaust pipe is connected to the outside of the exhaust port. The other end of the exhaust pipe is connected to a transition assembly, and the transition assembly is connected to a gas collection mechanism.

[0011] Furthermore, the first discharge assembly, the second discharge assembly and the third discharge assembly all include discharge pipes connected to the bottom of the waste liquid sedimentation tank, the guide pipe and the bottom of the treatment barrel, and valves are installed on the discharge pipes.

[0012] Furthermore, a plurality of reinforcement rods are installed on the support frame.

[0013] Furthermore, the other end of the discharge pipe is connected to the source of the urea waste liquid through a preliminary sedimentation component, and the preliminary sedimentation component includes a preliminary sedimentation box installed on the top of the waste liquid sedimentation box, the top of the discharge pipe is placed in the preliminary sedimentation box, and two first partition plates are arranged in the preliminary sedimentation box, the bottoms of the two first partition plates are connected to the bottom surface of the preliminary sedimentation box, the top horizontal height of the discharge pipe is lower than the top height of the first partition plate close to the discharge pipe, and the top height of the first partition plate away from the discharge pipe is higher than the top height of another first partition plate.

[0014] Furthermore, a climbing ladder is provided on one side of the waste liquid sedimentation mechanism and the waste liquid treatment mechanism, a walking platform is installed on the top of the waste liquid sedimentation tank, and the walking platform and the top of the insulation cylinder are connected by a small ladder.

[0015] Furthermore, the installation assembly includes a fixed beam, both ends of which are respectively connected to the top of the waste liquid sedimentation tank and the walking platform, and a plurality of U-shaped fastening rods are connected to the fixed beam. The guide groove is placed in the U-shaped fastening rod and fixed on the fixed beam.

[0016] Furthermore, a plurality of triangular grooves are provided on the top of the guide groove, and the intervals between two adjacent triangular grooves are equal.

[0017] Furthermore, a pressure gauge and a liquid level gauge are installed on the outer wall of the heat preservation cylinder, and the sensing ends of the pressure gauge and the liquid level gauge are both placed inside the processing barrel.

[0018] Furthermore, the waste liquid treatment mechanism also includes a pressure relief assembly, which includes an exhaust fan connected to the treatment barrel and the exhaust pipe through a connecting pipe, and the air outlet pipe of the exhaust fan is connected to the transition assembly.

[0019] Furthermore, the transition assembly includes a transition box and a plurality of second partition plates connected to the interior of the transition box, the bottoms of the exhaust pipe and the exhaust fan outlet pipe are connected to the transition box, and the transition box is connected to the gas collection mechanism.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are:

[0021] During use of the present invention, urea waste liquid is firstly precipitated through a primary precipitation component, so that impurities with heavier weight in the waste liquid fall into a primary precipitation box, and the waste liquid after the primary precipitation is discharged into the waste liquid precipitation box for further precipitation, and the waste liquid on the top falls into the guide groove through the triangular groove and is sent to the processing barrel through the liquid receiving barrel and the guide pipe. After heating in the processing barrel, urea is decomposed into ammonia and carbon dioxide, and escapes together with ammonia dissolved in the urea waste liquid, and is sent to a gas collection mechanism through an exhaust pipe for collection. Therefore, during use of the entire processing device, the urea waste liquid can be effectively treated, and the reuse, harmless discharge and treatment of the urea waste liquid are realized, thereby making the entire processing device conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 This is a stereoscopic diagram of a urea production waste liquid treatment device of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 This is a front view of the urea production waste liquid treatment device of the present invention;

[0026] Figure 4 This is a top view of the urea production waste liquid treatment device of the present invention;

[0027] Figure 5 This is a side view of the urea production waste liquid treatment device of the present invention;

[0028] Figure 6 It is a cross-sectional view of a waste liquid treatment mechanism;

[0029] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0030] Figure 8 It is a schematic diagram of the internal structure of the transition component;

[0031] Explanation of the reference numerals: 1. Support frame; 2. Waste liquid sedimentation tank; 3. First discharge assembly; 4. Discharge inlet pipe; 5. Guide trough; 6. Liquid receiving bucket; 7. Guide pipe; 8. Second discharge assembly; 9. Insulation cylinder; 10. Treatment bucket; 11. Third discharge assembly; 12. Heater; 13. Heating pipe; 14. Mounting groove; 15. Exhaust pipe; 16. Transition assembly; 161. Transition box; 162. Second partition; 17. Reinforcement rod; 18. Preliminary sedimentation tank; 19. First partition; 20. Climbing ladder; 21. Walking platform; 22. Small ladder; 23. Fixed beam; 24. U-shaped fastening rod; 25. Triangular groove; 26. Pressure gauge; 27. Liquid level gauge; 28. Connecting pipe; 29. ​​Exhaust fan. DETAILED DESCRIPTION

[0032] like Figure 1-8 As shown, a urea production waste liquid treatment device includes a waste liquid precipitation mechanism and a waste liquid treatment mechanism connected to each other.

[0033] The waste liquid sedimentation mechanism includes a waste liquid sedimentation tank 2 connected to a support frame 1, and a plurality of reinforcing rods 17 are installed on the support frame 1. The bottom of the waste liquid sedimentation tank 2 is in a constricted shape, and a first discharge assembly 3 is connected to the bottom, and the first discharge assembly 3 is connected to the pre-treatment sediment collection mechanism. A discharge pipe 4 is inserted into the interior of the waste liquid sedimentation tank 2, and the other end of the discharge pipe 4 is connected to the source of urea waste liquid. The interior of the waste liquid sedimentation tank 2 is connected to two guide grooves 5 through a mounting assembly, and a plurality of triangular grooves 25 are provided on the top of the guide groove 5, and the spacing between two adjacent triangular grooves 25 is equal. The end of the guide groove 5 close to the waste liquid treatment mechanism is connected to a liquid receiving bucket 6 arranged in the top of the waste liquid sedimentation tank 2 through a connecting pipe, and a guide pipe 7 is connected to the bottom of the liquid receiving bucket 6, and the other end of the guide pipe 7 is connected to the waste liquid treatment mechanism, and a second discharge assembly 8 is connected to the bottom of the bending part of the guide pipe 7, and the second discharge assembly 8 is connected to the pre-treatment sediment collection mechanism.

[0034] The waste liquid treatment mechanism includes a heat preservation cylinder 9 with a top seal and a treatment barrel 10 fixed on the inner wall of the heat preservation cylinder 9. The bottom of the treatment barrel 10 is funnel-shaped and is connected to a third discharge component 11. The third discharge component 11 passes through the heat preservation cylinder 9 and is connected to a treated sediment collection mechanism. A heater 12 is installed on the outer wall of the heat preservation cylinder 9. The heater 12 is connected to a heating pipe 13 installed on the inner wall of the bottom of the treatment barrel 10. A disc-shaped mounting groove 14 is provided on the inner wall of the bottom of the treatment barrel 10. The heating pipe 13 is coiled on the mounting groove 14. Exhaust ports are provided on the tops of the heat preservation cylinder 9 and the treatment barrel 10. An exhaust pipe 15 is connected to the outside of the exhaust port. The other end of the exhaust pipe 15 is connected to a transition component 16, and the transition component 16 is connected to a gas collection mechanism.

[0035] A climbing ladder 20 is provided on one side of the waste liquid sedimentation mechanism and the waste liquid treatment mechanism. A walking platform 21 is installed on the top of the waste liquid sedimentation tank 2. The walking platform 21 and the top of the insulation cylinder 9 are connected by a small ladder 22.

[0036] The installation assembly includes a fixed beam 23, the two ends of which are respectively connected to the top of the waste liquid sedimentation tank 2 and the walking platform 21, and a plurality of U-shaped fastening rods 24 are connected to the fixed beam 23. The guide groove 5 is placed in the U-shaped fastening rod 24 and fixed on the fixed beam 23.

[0037] The first discharge assembly 3, the second discharge assembly 8 and the third discharge assembly 11 all include discharge pipes connected to the bottom of the waste liquid sedimentation tank 2, the guide pipe 7 and the bottom of the treatment barrel 10, and valves are installed on the discharge pipes.

[0038] The other end of the discharge pipe 4 is connected to the source of the urea waste liquid through a preliminary sedimentation component, and the preliminary sedimentation component includes a preliminary sedimentation box 18 installed on the top of the waste liquid sedimentation tank 2. The top of the discharge pipe 4 is placed in the preliminary sedimentation box 18, and two first partition plates 19 are arranged in the preliminary sedimentation box 18. The bottoms of the two first partition plates 19 are connected to the bottom surface of the preliminary sedimentation box 18. The top horizontal height of the discharge pipe 4 is lower than the top height of the first partition plate 19 close to the discharge pipe 4, and the top height of the first partition plate 19 away from the discharge pipe 4 is higher than the top height of another first partition plate 19.

[0039] A pressure gauge 26 and a liquid level gauge 27 are installed on the outer wall of the heat preservation cylinder 9 , and the sensing ends of the pressure gauge 26 and the liquid level gauge 27 are both placed inside the treatment barrel 10 .

[0040] The waste liquid treatment mechanism also includes a pressure relief component, which includes an exhaust fan 29 connected to the treatment barrel 10 and the exhaust pipe 15 through a connecting pipe 28, and the air outlet pipe of the exhaust fan 29 is connected to the transition component 16. When the pressure in the treatment barrel 10 is too high, the exhaust fan 29 will start working and then quickly draw the gas from the treatment barrel 10 to the transition component 16 to avoid damage to the equipment due to excessive pressure in the treatment barrel 10.

[0041] The transition assembly 16 includes a transition box 161 and a plurality of second partition plates 162 connected to the interior of the transition box 161. The bottoms of the exhaust pipe 15 and the air outlet pipe of the exhaust fan 29 are both connected to the transition box 161. The transition box 161 is connected to a gas collection mechanism.

[0042] The action process of the present invention is as follows:

[0043] When in use, the urea waste liquid is discharged into the preliminary sedimentation tank 18, and then blocked by the first partition plate 19, so that the liquid on the top of the waste liquid is discharged into the waste liquid sedimentation tank 2 through the discharge pipe 4, and the waste liquid is precipitated again in the waste liquid sedimentation tank 2, and the waste liquid on the top flows into the guide groove 5 through the triangular groove 25, and then discharged into the liquid receiving barrel 6 through the guide groove 5, and then the waste liquid in the liquid receiving barrel 6 is discharged into the processing barrel 10 through the guide pipe 7, and then the heater 12 works to make the heating pipe 13 heat the waste liquid in the processing barrel 10, and the heated waste liquid evaporates to generate gas, which is discharged into the transition box 161 through the exhaust pipe 15, and is blocked by the second partition plate 162 to reduce the speed of the gas, and then the gas is sent to the gas collection mechanism.

[0044] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A urea production waste liquid treatment device, characterized in that: It includes a waste liquid sedimentation mechanism and a waste liquid treatment mechanism connected to each other; The waste liquid sedimentation mechanism comprises a waste liquid sedimentation tank (2) connected to a support frame (1); the bottom of the waste liquid sedimentation tank (2) is in a constricted shape and is connected to a first discharge assembly (3) at the bottom; the first discharge assembly (3) is connected to a pre-treatment sediment collection mechanism; a discharge pipe (4) is inserted into the interior of the waste liquid sedimentation tank (2); the other end of the discharge pipe (4) is connected to a urea waste liquid source; two guide grooves (5) are connected to the interior of the waste liquid sedimentation tank (2) through a mounting assembly; one end of the guide groove (5) close to the waste liquid treatment mechanism is connected to a liquid receiving bucket (6) arranged in the top of the waste liquid sedimentation tank (2) through a connecting pipe; the bottom of the liquid receiving bucket (6) is connected to a guide pipe (7); the other end of the guide pipe (7) is connected to the waste liquid treatment mechanism; the bottom of the bent portion of the guide pipe (7) is connected to a second discharge assembly (8); the second discharge assembly (8) is connected to the pre-treatment sediment collection mechanism; The waste liquid treatment mechanism comprises a heat preservation cylinder (9) with a top seal and a treatment barrel (10) fixed on the inner wall of the heat preservation cylinder (9); the bottom of the treatment barrel (10) is funnel-shaped and connected to a third discharge assembly (11); the third discharge assembly (11) passes through the heat preservation cylinder (9) and is connected to a treated sediment collection mechanism; a heater (12) is installed on the outer wall of the heat preservation cylinder (9); the heater (12) is connected to a heating pipe (13) installed on the inner wall of the bottom of the treatment barrel (10); a disc-shaped installation groove (14) is provided on the inner wall of the bottom of the treatment barrel (10); the heating pipe (13) is coiled on the installation groove (14); the tops of the heat preservation cylinder (9) and the treatment barrel (10) are both provided with exhaust ports; the outer side of the exhaust port is connected to an exhaust pipe (15); the other end of the exhaust pipe (15) is connected to a transition assembly (16); and the transition assembly (16) is connected to a gas collection mechanism.

2. The urea production waste liquid treatment device according to claim 1, characterized in that: The first discharge assembly (3), the second discharge assembly (8) and the third discharge assembly (11) all comprise discharge pipes connected to the bottom of the waste liquid sedimentation tank (2), the guide pipe (7) and the bottom of the treatment barrel (10), and valves are installed on the discharge pipes.

3. The urea production waste liquid treatment device according to claim 1, characterized in that: A plurality of reinforcement rods (17) are installed on the support frame (1).

4. The urea production waste liquid treatment device according to claim 1, characterized in that: The other end of the discharge pipe (4) is connected to the source of the urea waste liquid through a primary sedimentation component, and the primary sedimentation component includes a primary sedimentation tank (18) installed on the top of the waste liquid sedimentation tank (2). The top of the discharge pipe (4) is placed in the primary sedimentation tank (18), and two first partition plates (19) are arranged in the primary sedimentation tank (18), and the bottoms of the two first partition plates (19) are connected to the bottom surface of the primary sedimentation tank (18). The top horizontal height of the discharge pipe (4) is lower than the top height of the first partition plate (19) close to the discharge pipe (4), and the top height of the first partition plate (19) away from the discharge pipe (4) is higher than the top height of another first partition plate (19).

5. The urea production waste liquid treatment device according to claim 1, characterized in that: A climbing ladder (20) is provided on one side of the waste liquid sedimentation mechanism and the waste liquid treatment mechanism, a walking platform (21) is installed on the top of the waste liquid sedimentation tank (2), and the walking platform (21) and the top of the heat preservation cylinder (9) are connected via a small ladder (22).

6. The urea production waste liquid treatment device according to claim 5, characterized in that: The mounting assembly comprises a fixed beam (23), the two ends of which are respectively connected to the top of the waste liquid sedimentation tank (2) and the walking platform (21), the fixed beam (23) is connected to a plurality of U-shaped fastening rods (24), and the guide groove (5) is placed in the U-shaped fastening rod (24) and fixed to the fixed beam (23).

7. The urea production waste liquid treatment device according to claim 1, characterized in that: A plurality of triangular grooves (25) are provided on the top of the guide groove (5), and the spacing between two adjacent triangular grooves (25) is equal.

8. The urea production waste liquid treatment device according to claim 1, characterized in that: A pressure gauge (26) and a liquid level gauge (27) are installed on the outer wall of the heat-insulating cylinder (9), and the sensing ends of the pressure gauge (26) and the liquid level gauge (27) are both placed inside the processing barrel (10).

9. The urea production waste liquid treatment device according to claim 8, characterized in that: The waste liquid treatment mechanism also includes a pressure relief component, which includes an exhaust fan (29) connected to the treatment barrel (10) and the exhaust pipe (15) through a connecting pipe (28), and the air outlet pipe of the exhaust fan (29) is connected to the transition component (16).

10. The urea production waste liquid treatment device according to claim 9, characterized in that: The transition assembly (16) comprises a transition box (161) and a plurality of second partition plates (162) connected to the interior of the transition box (161); the bottoms of the exhaust pipe (15) and the air outlet pipe of the exhaust fan (29) are both connected to the transition box (161); and the transition box (161) is connected to a gas collection mechanism.

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