Energy-saving urea hydrolysis reactor
By designing a urea hydrolysis reactor that uses the heat exchange of wastewater heat with urea solution in the urea hydrolysis reaction, the problem of wastewater heat not being utilized in the prior art is solved, and energy conservation and efficient heat utilization are achieved.
Patent Information
- Application Number
- CN202422211060.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-10
AI Technical Summary
In the existing urea hydrolysis reaction, steam recycling is more common, but the higher heat present in the wastewater is ignored, resulting in energy loss.
An energy-saving urea hydrolysis reactor is designed to use the wastewater heat generated during urea hydrolysis to exchange heat with the urea solution. By designing preheating the shell and jacket layer, neutralization treatment and heat reuse of wastewater are achieved.
The effective utilization of wastewater heat in urea hydrolysis reaction is achieved, energy consumption is reduced, and heat utilization efficiency is improved.
Smart Images
Figure CN223027306U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of urea hydrolysis, and particularly relates to an energy-saving urea hydrolysis reactor. Background Art
[0002] The urea hydrolysis reaction consumes a large amount of steam. In order to reduce the system energy consumption, generally, the waste heat of steam drainage is recovered and utilized. The common method is to exchange heat with the urea solution or to be used for the preparation of the urea solution; however, in the above methods, the waste water generated during the urea hydrolysis process is usually ignored, which also has a relatively high heat, and direct discharge will cause energy loss. Summary of the Utility Model
[0003] The purpose of the utility model is to provide an energy-saving urea hydrolysis reactor that utilizes the heat of waste water during the urea hydrolysis process to address the deficiencies in the above background art.
[0004] To achieve the above purpose, an energy-saving urea hydrolysis reactor of the utility model adopts the following technical solutions:
[0005] An energy-saving urea hydrolysis reactor includes a reaction shell. A partition is arranged inside the shell, which divides the inside of the reaction shell into a reaction zone and an overflow zone. There is a gap between the partition and the top of the reaction shell. Steam coils are arranged in both the reaction zone and the overflow zone. A liquid outlet is arranged at the lower part of the overflow zone. An air outlet pipe is arranged above the reaction shell. A preheating shell is arranged below the reaction shell. The liquid outlet is connected to a liquid outlet pipe, and the liquid outlet pipe extends into and passes through the preheating shell.
[0006] A further improvement of the energy-saving urea hydrolysis reactor of the utility model is that the liquid outlet is also connected to a second liquid outlet pipe. A jacket layer is arranged outside one end of the air outlet pipe far from the reaction shell. The second liquid outlet pipe is connected to the jacket layer, and the jacket layer is also connected to a connecting outlet pipe, and the connecting outlet pipe extends into and passes through the preheating shell.
[0007] A further improvement of the energy-saving urea hydrolysis reactor of the utility model is that the liquid outlet is also connected to a third liquid outlet pipe.
[0008] A further improvement of the energy-saving urea hydrolysis reactor of the utility model is that a filter pipe is arranged between the liquid outlet and the liquid outlet pipe, the second liquid outlet pipe, and the third liquid outlet pipe.
[0009] A further improvement of the energy-saving urea hydrolysis reactor of the utility model is that the jacket layer and the liquid outlet pipe are both connected to a neutralizer inlet pipe.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] This utility model utilizes the waste heat of wastewater to exchange heat with urea solution to achieve the utilization of waste heat and energy conservation. At the same time, the wastewater is subjected to neutralization treatment, which not only treats the wastewater but also increases heat, improving the heat exchange effect and overall achieving full utilization of energy. Brief Description of the Drawings
[0012] Figure 1 It is a schematic structural diagram of this utility model;
[0013] In the figure: 1 reaction shell, 2 partition board, 3 steam coil, 4 liquid outlet pipe, 5 second liquid outlet pipe, 6 third liquid outlet pipe, 7 gas outlet pipe, 8 jacket layer, 9 connecting outlet pipe, 10 heater, 11 preheating shell. Detailed Embodiment
[0014] Next, the technical solutions in the embodiments of this utility model will be clearly and completely described in conjunction with the drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all the embodiments. Based on the embodiments in this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this utility model.
[0015] As Figure 1 shown, an energy-saving urea hydrolysis reactor includes a reaction shell 1. A partition board 2 is arranged inside the shell. The partition board divides the inside of the reaction shell into a reaction area and an overflow area. There is a gap between the partition board and the top of the reaction shell. Steam coils 3 are arranged in both the reaction area and the overflow area. The reaction area is provided with a urea solution inlet and a sewage outlet. The lower part of the overflow area is provided with a liquid outlet. A gas outlet pipe 7 is arranged above the reaction shell. A preheating shell 11 is arranged below the reaction shell. The liquid outlet is connected to a liquid outlet pipe 4, and the liquid outlet pipe extends into and passes through the preheating shell. The preheating shell can be independent on one side of the reaction shell. The preheating shell and the urea solution inlet of the reaction shell are connected by a pipeline. A heater can also be arranged separately inside the preheating shell.
[0016] The liquid outlet is also connected to a second liquid outlet pipe 5. A jacket layer 8 is arranged outside one end of the gas outlet pipe away from the reaction shell. The second liquid outlet pipe is connected to the jacket layer. The jacket layer is also connected to a connecting outlet pipe 9, and the connecting outlet pipe extends into and passes through the preheating shell. The parts of the liquid outlet pipe and the connecting outlet pipe placed inside the preheating shell can be made of materials with better heat transfer performance, and the rest are made of materials with better heat insulation performance.
[0017] The liquid outlet is also connected to a third liquid outlet pipe 6. It is used for the direct discharge of wastewater.
[0018] A filter pipe is arranged between the liquid outlet and the liquid outlet pipe, the second liquid outlet pipe, and the third liquid outlet pipe. The jacket layer and the liquid outlet pipe are both connected with a neutralizing agent inlet pipe.
[0019] The working principle of the present utility model is as follows: The urea solution hydrolyzes in the reaction zone of the reaction housing, and then the replenished urea solution overflows to the overflow zone and reacts again. The generated gas enters the outlet pipe and is used for the flue gas denitration structure. The generated wastewater enters the outlet pipe or the second outlet pipe. The outlet pipe exchanges heat with the urea solution in the preheating housing, and the second outlet pipe exchanges heat with the outlet pipe that is farther away from the reactor to prevent the condensation of the product gas to form the side reaction of ammonium carbamate, and then enters the preheating housing for heat exchange. At the same time, the wastewater first passes through the filter pipe and then enters the outlet pipe. When treating the wastewater, a neutralization reaction should be carried out first, and the heat generated by adding the neutralizing agent can also improve the heat exchange effect with the urea solution in the preheating housing.
[0020] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.
Claims
1. An energy-saving urea hydrolysis reactor, comprising a reaction shell, a partition is arranged in the shell, the partition divides the reaction shell into a reaction zone and an overflow zone, a distance is left between the partition and the top of the reaction shell, and steam coils are arranged in the reaction zone and the overflow zone, characterized in that: A liquid outlet is provided at the bottom of the overflow area, an air outlet pipe is provided above the reaction shell, a preheating shell is provided below the reaction shell, the liquid outlet is connected to the liquid outlet pipe, and the liquid outlet pipe extends into and passes through the preheating shell.
2. An energy-saving urea hydrolysis reactor according to claim 1, characterized in that: The liquid outlet is also connected to the second liquid outlet pipe, a jacket layer is provided on the outer side of one end of the gas outlet pipe away from the reaction shell, the second liquid outlet pipe is connected to the jacket layer, and the jacket layer is also connected to a connecting outlet pipe, which extends into and passes through the preheating shell.
3. An energy-saving urea hydrolysis reactor according to claim 2, characterized in that: The liquid outlet is also connected to the third liquid outlet pipe.
4. An energy-saving urea hydrolysis reactor according to claim 3, characterized in that: A filter tube is arranged between the liquid outlet and the liquid outlet pipe, the second liquid outlet pipe and the third liquid outlet pipe.
5. An energy-saving urea hydrolysis reactor according to claim 4, characterized in that: The jacket layer and the liquid outlet pipe are both connected with a neutralizer inlet pipe.