Formaldehyde urea reactor and urea production system

Abstract

The utility model discloses a formaldehyde urea reactor and a urea production system, and relates to urea production equipment. The formaldehyde urea reactor comprises a reactor body, a recovery pipeline and a first inflation pipeline, a first opening is formed in the upper part of the reactor body, and the first opening is communicated with a liquid outlet pipe through a first stop valve; a second opening is formed in the bottom of the reactor body, and the second opening is communicated with a first liquid inlet pipe and a second liquid inlet pipe through a second stop valve and a third stop valve respectively and used for filling urine and formaldehyde respectively; the recovery pipeline is communicated with the second opening, and a fourth stop valve is arranged on the recovery pipeline; the first gas filling pipeline is communicated with a third opening in the upper part of the reactor body so as to fill inert gas into the reactor body, and a fifth stop valve is arranged on the first gas filling pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of urea production equipment, and in particular to a formaldehyde urea reactor and a urea production system. Background Art

[0002] In the production of urea, a formaldehyde urea reactor is provided, and methylene diurea generated by the reaction of formaldehyde and urine is used as an additive for the urea fluidized bed granulator to ensure the particle size and strength of the product particles.

[0003] After long-term use, the reactor needs regular maintenance. The current maintenance method is to use a large amount of formaldehyde to replace the urine, water and methylene diurea in the reactor, and then discharge the replacement formaldehyde into the waste liquid tank.

[0004] However, the formaldehyde discharge after replacement not only has a slow processing speed, but also causes waste of formaldehyde, and cannot meet the requirements of energy conservation and emission reduction in the urea production system. Utility Model Content

[0005] The present embodiment provides a formaldehyde urea reactor and a urea production system, which can solve the problem that the cleaning work before the maintenance of the existing reactor not only has a slow formaldehyde treatment speed but also causes formaldehyde waste and cannot meet the energy conservation and emission reduction requirements of the urea production system.

[0006] The first aspect of the present application provides a formaldehyde urea reactor, which comprises

[0007] A reactor body, wherein a first opening is provided at the top of the reactor body, and the first opening is connected to a liquid outlet pipe through a first cut-off valve; a second opening is provided at the bottom of the reactor body, and the second opening is connected to a first liquid inlet pipe and a second liquid inlet pipe through a second cut-off valve and a third cut-off valve, respectively, for respectively filling urine and formaldehyde;

[0008] a recovery pipeline, the recovery pipeline being connected to the second opening and provided with a fourth shut-off valve;

[0009] The first gas filling pipeline is connected to the third opening at the upper part of the reactor body so as to fill the reactor body with inert gas. A fifth shut-off valve is arranged on the first gas filling pipeline.

[0010] In some modified implementations of the first aspect of the present application, the aforementioned formaldehyde urea reactor further includes a second charging pipeline;

[0011] The second gas filling pipeline is in communication with the second opening, and can fill the reactor body with replacement gas, so that the inert gas is discharged from the reactor body.

[0012] In some modified implementations of the first aspect of the present application, in the aforementioned formaldehyde urea reactor, a sixth shut-off valve is provided on the second inflation pipeline.

[0013] In some modified implementations of the first aspect of the present application, in the aforementioned formaldehyde urea reactor, a first check valve is provided on the second inflation pipeline, and the first check valve is arranged at one end of the sixth cut-off valve toward the reactor body.

[0014] In some modified implementations of the first aspect of the present application, the aforementioned formaldehyde urea reactor further includes an air outlet pipeline;

[0015] The gas outlet pipeline is connected to the fourth opening at the top of the reactor body.

[0016] In some modified implementations of the first aspect of the present application, in the aforementioned formaldehyde urea reactor, a seventh shut-off valve is provided on the gas outlet pipeline.

[0017] In some modified implementations of the first aspect of the present application, the aforementioned formaldehyde urea reactor further includes a safety valve;

[0018] The safety valve is arranged on the top of the reactor body, and the outlet end of the safety valve is connected to the gas outlet pipeline.

[0019] In some modified implementations of the first aspect of the present application, the aforementioned formaldehyde urea reactor further includes a pressure gauge;

[0020] The pressure gauge is arranged on the top of the reactor body and is used to check and display the pressure in the reactor body.

[0021] In some modified implementations of the first aspect of the present application, the aforementioned formaldehyde urea reactor further includes a second check valve and a third check valve;

[0022] The second check valve is arranged at an end of the fourth cut-off valve away from the reactor body;

[0023] The third check valve is arranged at one end of the fifth cut-off valve facing the reactor body;

[0024] The end of the recovery pipeline is connected to the liquid source tank of the second liquid inlet pipe.

[0025] In a second aspect of the present application, a urea production system is provided, which includes at least one formaldehyde urea reactor as described above.

[0026] Compared with the prior art, the formaldehyde urea reactor provided by the present application can allow urine and formaldehyde to enter the reactor body for reaction through the arrangement of a liquid outlet pipe, a first liquid inlet pipe and a second liquid inlet pipe, and then during the cleaning work before maintenance, urine, methylene diurea and water can be replaced through the liquid outlet pipe; at the same time, a first charging pipeline and a recovery pipeline are arranged, and inert gas can be filled into the reactor body through the first charging pipeline to recover the formaldehyde used for replacement through the recovery pipeline for reuse, which can not only quickly discharge the formaldehyde used for replacement but also recover and reuse the formaldehyde, avoiding the waste of formaldehyde, greatly reducing cost waste, and at the same time being beneficial to energy conservation and emission reduction of the entire system; thereby solving the problem that the cleaning work before maintenance of the existing reactor not only has a slow processing speed for formaldehyde but also causes waste of formaldehyde, and cannot meet the energy conservation and emission reduction requirements of the urea production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0028] Figure 1 The structure diagram of the first formaldehyde urea reactor provided in this embodiment is schematically shown;

[0029] Figure 2 The schematic diagram of the structure of the second formaldehyde urea reactor provided in this embodiment is schematically shown;

[0030] Figure 3 The structural diagram of the third formaldehyde urea reactor provided in this embodiment is schematically shown;

[0031] Figure 4 The structure diagram of the fourth formaldehyde urea reactor provided in this embodiment is schematically shown;

[0032] Explanation of the accompanying drawings: reactor body 1, recovery pipeline 2, first charging pipeline 3, first shut-off valve 4, liquid outlet pipe 5, second shut-off valve 6, third shut-off valve 7, first liquid inlet pipe 8, second liquid inlet pipe 9, fourth shut-off valve 10, fifth shut-off valve 11, second charging pipeline 12, sixth shut-off valve 13, first check valve 14, gas outlet pipeline 15, seventh shut-off valve 16, safety valve 17, pressure gauge 18, second check valve 19, third check valve 20. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0035] The technical solution of the embodiment of the present disclosure is to solve the above technical problems, and the overall idea is as follows:

[0036] Example 1

[0037] Reference Figure 1 The formaldehyde urea reactor provided by the embodiment of the present disclosure includes a reactor body 1, a recovery pipeline 2 and a first charging pipeline 3. The upper part of the reactor body 1 is provided with a first opening, and the first opening is connected to a liquid outlet pipe 5 through a first shut-off valve 4; the bottom of the reactor body 1 is provided with a second opening, and the second opening is respectively connected to a first liquid inlet pipe 8 and a second liquid inlet pipe 9 through a second shut-off valve 6 and a third shut-off valve 7, for respectively filling urine and formaldehyde; the recovery pipeline 2 is connected to the second opening, and a fourth shut-off valve 10 is provided on the recovery pipeline 2; the first charging pipeline 3 is connected to the third opening at the upper part of the reactor body 1 to fill the reactor body 1 with inert gas, and a fifth shut-off valve 11 is provided on the first charging pipeline 3.

[0038] Specifically, in order to solve the problem that the cleaning work before the maintenance of the existing reactor not only has a slow formaldehyde treatment speed but also causes formaldehyde waste, and cannot meet the energy conservation and emission reduction requirements of the urea production system, the formaldehyde urea reactor provided in this embodiment can use the inert gas to discharge and recover the formaldehyde used for replacement through the recovery pipeline 2 through the setting of the first inflation pipeline 3 and the recovery pipeline 2, thereby avoiding a large amount of formaldehyde used for replacement from entering the waste liquid tank, greatly reducing the waste of formaldehyde, and effectively ensuring the overall energy conservation and emission reduction of the urea production system.

[0039] The reactor body 1 is a rigid cavity structure with a containing space, which can be, but is not limited to, a reaction tank, a reaction kettle, etc. The shape and size of the reactor body 1 are not limited here, and can be designed and adjusted according to actual needs, or the existing reactor structure can be used, and the recovery pipeline 2 and the first inflation pipeline 3 can be set accordingly.

[0040] Among them, the liquid outlet pipe 5, the first liquid inlet pipe 8 and the second liquid inlet pipe 9 are all pressure-resistant, corrosion-resistant and high-temperature resistant pipe structures, which can be a hose structure or a metal or alloy pipe body. It can be understood that the end of the first liquid inlet pipe 8 is connected to a urine liquid source tank (not shown in the figure), the end of the second liquid inlet pipe 9 is connected to a formaldehyde liquid source tank (not shown in the figure), and the end of the liquid outlet pipe 5 is connected to a waste liquid tank (not shown in the figure) and a downstream granulator (not shown in the figure); during normal production, the first shut-off valve 4, the second shut-off valve 6 and the third shut-off valve 7 are all opened, so that urine and formaldehyde can enter the reactor body 1 to react and generate methylene diurea, and methylene diurea can enter the downstream granulator through the liquid outlet pipe 5 for conventional production; when the reactor body 1 needs to be emptied, the second shut-off valve 6 is closed, and formaldehyde is continuously introduced into the reactor body 1, and the unreacted urea, methylene diurea and water in the reactor body 1 are discharged to the waste liquid tank through the liquid outlet pipe 5 until only formaldehyde is left in the reactor body 1, and the replacement is completed. Under this setting mode, a temporary outlet (not shown in the figure) can be set on the liquid outlet pipe 5, and by observing that the liquid state becomes clear and transparent, it means that only formaldehyde is discharged from the reactor body 1; or a temperature sensor (not shown in the figure) can be set on the reactor body 1. Since the temperature in the reactor body 1 is high during normal reaction, the formaldehyde gradually increases during the replacement process, and the temperature gradually decreases. It is well known to those skilled in the art that the temperature of formaldehyde itself is around 40 degrees, and then when the temperature sensor detects that the temperature drops to 45 degrees-50 degrees, it can be explained that the reactor body 1 is inside. In this embodiment, the liquid outlet pipe 5 is set at the upper part of the reactor body 1, and the second liquid inlet pipe 9 is set at the bottom of the reactor body 1. When performing formaldehyde replacement, the dead corner of the upper part of the reactor body 1 can be thoroughly cleaned by backwashing to avoid residual internal reactants or reaction products. The ends of each pipeline described in this embodiment are all one end away from the reactor body 1, and the following content is no longer emphasized. The first shut-off valve 4, the liquid outlet pipe 5, the second shut-off valve 6, and the third shut-off valve 7 are all manually controlled shut-off valves, and their structures and working principles can be easily understood by those skilled in the art, and will not be described in detail here.

[0041] Among them, the recovery pipeline 2 is a pressure-resistant, corrosion-resistant and high-temperature resistant pipe structure, which can be a hose structure or a metal or alloy pipe body. The size and shape of the recovery pipeline 2 are not limited here, and can be designed and adjusted according to actual needs. For example: when the end of the recovery pipeline 2 is connected to the collection tank (not shown in the figure), the design adjustment can be made according to the distance between the reactor body 1 and the collection tank and the formaldehyde discharge rate; for another example: when the end of the recovery pipeline 2 is connected to the formaldehyde liquid source tank, the design adjustment can be made according to the distance between the reactor body 1 and the formaldehyde liquid source tank and the formaldehyde discharge rate. The fourth shut-off valve 10 is a manually controlled shut-off valve. When normal production reaction and formaldehyde replacement are carried out in the reactor body 1, the fourth shut-off valve 10 is in a closed state. When the formaldehyde replacement is completed and needs to be recovered, the fourth shut-off valve 10 is opened to open the recovery pipeline 2. It can be understood that a temporary outlet (not shown in the figure) can be set on the recovery pipeline 2, and the recovery of formaldehyde is completed by observing that no liquid is discharged from the recovery pipeline 2.

[0042] Among them, the first gas-filling pipeline 3 is a pipe body structure that is resistant to pressure, corrosion and high temperature, which can be a hose structure or a metal or alloy pipe body. The size and shape of the first gas-filling pipeline 3 are not limited here, and can be designed and adjusted according to the actual inflation rate requirements. The end of the first gas-filling pipeline 3 is connected to a gas pressurization workstation (not shown in the figure), which is easily understood by those skilled in the art; the first gas-filling pipeline 3 is introduced with an inert gas with a specified pressure, which can be but not limited to nitrogen, and then the formaldehyde in the reactor body is pressed down to the inside and outside of the recovery pipeline 2 by pressurized nitrogen. The fifth shut-off valve 11 is a manually controlled shut-off valve. When normal production reaction and formaldehyde replacement are carried out in the reactor body 1, the fifth shut-off valve 11 is in a closed state. When the formaldehyde replacement is completed and needs to be recovered, the fifth shut-off valve 11 is opened to open the first gas-filling pipeline 3.

[0043] According to the above, the formaldehyde urea reactor provided by the present application can allow urine and formaldehyde to enter the reactor body 1 for reaction through the arrangement of the liquid outlet pipe 5, the first liquid inlet pipe 8 and the second liquid inlet pipe 9, and then the urine, methylene diurea and water can be replaced through the liquid outlet pipe during the cleaning work before maintenance; at the same time, the first charging pipeline 3 and the recovery pipeline 2 are arranged to fill the reactor body 1 with inert gas through the first charging pipeline 3, and the formaldehyde used for replacement can be recovered and reused through the recovery pipeline 2, which can not only quickly discharge the formaldehyde used for replacement but also recover and reuse the formaldehyde, avoiding the waste of formaldehyde, greatly reducing cost waste, and at the same time can also be beneficial to energy conservation and emission reduction of the entire system; thereby solving the problem that the cleaning work before maintenance of the existing reactor not only has a slow processing speed for formaldehyde but also causes waste of formaldehyde, and cannot meet the energy conservation and emission reduction requirements of the urea production system.

[0044] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which is specifically understood as: A and B may be included at the same time, A may exist alone, or B may exist alone, and any of the above three situations may exist.

[0045] Further, see Attachment Figure 2 The formaldehyde urea reactor provided in this embodiment, in a specific implementation, further includes a second gas filling pipeline 12; the second gas filling pipeline 12 is connected to the second opening, and can fill the reactor body 1 with replacement gas to allow the inert gas to be discharged from the reactor body 1.

[0046] Specifically, in order to realize the maintenance of the reactor, a second gas-filling pipeline 12 is provided in the present embodiment. The second gas-filling pipeline 12 is a pressure-resistant, corrosion-resistant and high-temperature resistant pipe body structure. It can be a hose structure or a metal or alloy pipe body. The size and shape of the second gas-filling pipeline 12 are not limited here, and can be designed and adjusted according to the actual inflation rate requirements or the inert gas replacement rate requirements. The replacement gas that can be introduced into the second gas-filling pipeline 12 can be, but is not limited to, air, oxygen and other gases that do not affect human breathing. The inert gas in the reactor body 1 is discharged by the replacement gas, so that the maintenance personnel can perform maintenance on the reactor body 1. The end of the second gas-filling pipeline 12 is connected to the gas pressurization station (not shown in the figure) so that the reactor body 1 can be filled with pressurized replacement gas to improve the replacement efficiency. It can be understood that in this embodiment, a sixth shut-off valve 13 is provided on the second gas charging pipeline 12. The sixth shut-off valve 13 is a controlled shut-off valve. When normal production reaction, formaldehyde replacement and formaldehyde recovery are carried out in the reactor body 1, the sixth shut-off valve 13 is kept closed. After the formaldehyde recovery is completed, the sixth shut-off valve 13 is opened to discharge and replace the inert gas. Under this setting mode, the fourth shut-off valve 10 can be left open after opening, and the inert gas can be discharged through the recovery pipeline 2, effectively saving the design cost.

[0047] Further, see Attachment Figure 2 In the formaldehyde urea reactor provided in this embodiment, in a specific implementation, a first check valve 14 is provided on the second inflation pipeline 12 , and the first check valve 14 is arranged at one end of the sixth shut-off valve 13 toward the reactor body 1 .

[0048] Specifically, in order to avoid contaminating the gas source at the end of the second inflation pipeline 12, a first check valve 14 is provided in this embodiment. The first check valve 14 can be easily understood by those skilled in the art, and it can only allow one-way passage of the fluid. In this embodiment, the second inflation pipeline 12 is allowed to allow fluid to pass in the direction of the reactor body 1, but not in the opposite direction. This can effectively prevent formaldehyde and inert gas from entering the gas source of the second inflation pipeline 12 and causing pollution.

[0049] Further, see Attachment Figure 3 The formaldehyde urea reactor provided in this embodiment, in a specific implementation, further includes an air outlet pipeline 15; the air outlet pipeline 15 is connected to the fourth opening at the top of the reactor body 1.

[0050] Specifically, in order to achieve rapid replacement of inert gas and improve the efficient maintenance of the reactor, an outlet pipeline 15 is provided in this embodiment. The outlet pipeline 15 is a pressure-resistant, corrosion-resistant and high-temperature resistant pipe body structure, which can be a hose structure or a metal or alloy pipe body. The size and shape of the outlet pipeline 15 are not limited here, and can be designed and adjusted according to the actual gas outlet rate requirements. The end of the outlet pipeline 15 can be opened or a collection tank can be provided to recycle the inert gas. When the inert gas is replaced, the outlet pipeline 15 and the recovery pipeline 2 are discharged synchronously, which greatly improves the replacement rate. It can be understood that in this embodiment, a seventh shut-off valve 16 can also be provided on the outlet pipeline 15. The seventh shut-off valve 16 is a manually controlled shut-off valve. When normal production, formaldehyde replacement, and formaldehyde discharge are carried out in the reactor body 1, the seventh shut-off valve 16 is in a closed state.

[0051] Further, see Attachment Figure 3 The formaldehyde urea reactor provided in this embodiment, in a specific implementation, further includes a safety valve 17 and a pressure gauge 18; the safety valve 17 is arranged at the top of the reactor body 1, and the outlet end of the safety valve 17 is connected to the gas outlet pipeline 15; the pressure gauge 18 is arranged at the top of the reactor body 1, and is used to check and display the pressure in the reactor body 1.

[0052] Specifically, in order to ensure the safety of the reactor cleaning process, the present embodiment is provided with a safety valve 17 and a pressure gauge 18; the safety valve 17 may be, but is not limited to, a pressure relief valve, which can relieve pressure when the pressure of the reactor body 1 is higher than the preset pressure of the safety valve 17 to ensure the safety of the reactor, and its structure and working principle can be easily understood by those skilled in the art, and will not be described in detail here; and it can be understood that the safety valve 17 in the present embodiment is connected to the outlet pipe 15 on the side of the seventh shut-off valve 16 away from the reactor body 1. The pressure gauge 18 can intuitively display the pressure indication, provide a reference for the operator, and timely adjust the inflation pressure of the first inflation pipe 3 and the second inflation pipe 12, and intuitively and quickly ensure the safety of the reactor cleaning.

[0053] Further, see Attachment Figure 4The formaldehyde urea reactor provided in this embodiment, in a specific implementation, further includes a second check valve 19 and a third check valve 20; the second check valve 19 is arranged at an end of the fourth cut-off valve 10 away from the reactor body 1; the third check valve 20 is arranged at an end of the fifth cut-off valve 11 toward the reactor body 1; the end of the recovery pipeline 2 is connected to the liquid source tank of the second liquid inlet pipe 9.

[0054] Specifically, in order to avoid contaminating the inert gas source and the reactor body 1, a second check valve 19 and a third check valve 20 are provided in this embodiment. The second check valve 19 and the third check valve 20 are easily understood by those skilled in the art, and can only allow one-way passage of the fluid. The provision of the second check valve 19 in this embodiment can only allow formaldehyde to return to the formaldehyde liquid source tank via the recovery line 2, and prevent formaldehyde in the recovery line 2 or the formaldehyde liquid source tank from entering the reactor body 1 and contaminating the reactor body 1 after cleaning and discharge; the provision of the third check valve 20 in this embodiment can only allow inert gas to enter the reactor body 1 via the first charging line 3, and prevent other substances in the reactor body 1 from entering the first charging line 3 and contaminating the inert gas source. The provision of the second check valve 19 and the third check valve 20 can improve the safety and cleanliness of the formaldehyde urea reactor and greatly improve the cleaning and discharge efficiency.

[0055] Further, it can be understood that the first shut-off valve 4, the second shut-off valve 6, the third shut-off valve 7, the fourth shut-off valve 10, the fifth shut-off valve 11, the sixth shut-off valve 13, and the seventh shut-off valve 16 provided in the present embodiment can be replaced with electrically controlled automatic regulating valves as needed, and automatic control can be achieved in conjunction with a controller (not shown in the figure), thereby improving the cleaning efficiency of the formaldehyde urea reactor; accordingly, when set to automatic control, the pressure gauge 18 can be replaced with a pressure sensor (not shown in the figure) to cooperate with the controller to detect and transmit relevant pressure signals; the status judgment of the relevant pipeline products can be coordinated with the setting of a component detector, and the component detector and the controller cooperate to generate control signals for each shut-off valve.

[0056] Example 2

[0057] This embodiment provides a urea production system, which includes at least one formaldehyde urea reactor.

[0058] Specifically, the formaldehyde urea reactor is the formaldehyde urea reactor described in Example 1. Please refer to the detailed description of Example 1 for its structure and working principle, which will not be repeated here.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A formaldehyde urea reactor, It is characterized in that include: A reactor body, wherein a first opening is provided at the top of the reactor body, and the first opening is connected to a liquid outlet pipe through a first cut-off valve; a second opening is provided at the bottom of the reactor body, and the second opening is connected to a first liquid inlet pipe and a second liquid inlet pipe through a second cut-off valve and a third cut-off valve, respectively, for respectively filling urine and formaldehyde; a recovery pipeline, the recovery pipeline being connected to the second opening and provided with a fourth shut-off valve; The first gas filling pipeline is connected to the third opening at the upper part of the reactor body so as to fill the reactor body with inert gas. A fifth shut-off valve is arranged on the first gas filling pipeline.

2. The formaldehyde urea reactor according to claim 1, Features: Also included is a second inflation line; The second gas filling pipeline is in communication with the second opening, and can fill the reactor body with replacement gas, so that the inert gas is discharged from the reactor body.

3. The formaldehyde urea reactor according to claim 2, Features: A sixth cut-off valve is provided on the second inflation pipeline.

4. The formaldehyde urea reactor according to claim 3, Features: The second inflation pipeline is provided with a first check valve, and the first check valve is arranged at one end of the sixth cut-off valve facing the reactor body.

5. The formaldehyde urea reactor according to claim 2, Features: It also includes an air outlet line; The gas outlet pipeline is connected to the fourth opening at the top of the reactor body.

6. The formaldehyde-urea reactor according to claim 5, Features: The air outlet pipeline is provided with a seventh cut-off valve.

7. The formaldehyde urea reactor according to claim 5, Features: It also includes a safety valve; The safety valve is arranged on the top of the reactor body, and the outlet end of the safety valve is connected to the gas outlet pipeline.

8. The formaldehyde-urea reactor according to claim 7, Features: Also included is a pressure gauge; The pressure gauge is arranged on the top of the reactor body and is used to check and display the pressure in the reactor body.

9. The formaldehyde urea reactor according to claim 1, Features: Also includes a second check valve and a third check valve; The second check valve is arranged at an end of the fourth cut-off valve away from the reactor body; The third check valve is arranged at one end of the fifth cut-off valve facing the reactor body; The end of the recovery pipeline is connected to the liquid source tank of the second liquid inlet pipe.

10. A urea production system, It is characterized in that It includes: At least one formaldehyde urea reactor according to any one of claims 1 to 9.

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