Steam direct injection heating system for finished product gas

Abstract

The utility model discloses a steam direct injection heating system for finished product gas, which comprises a hydrolyzer, one end of the hydrolyzer is connected with a liquid inlet pipe for introducing urea solution, the surface of the hydrolyzer is provided with a plurality of gas-water separators, the top of the hydrolyzer is connected with an SCR (Selective Catalytic Reduction) pipe, and the surface of the hydrolyzer is connected with a steam inlet assembly. A urea solution is pumped into the liquid inlet pipe and is introduced into the hydrolyzer through the liquid inlet pipe, so that the urea solution is hydrolyzed by the hydrolyzer to produce ammonia and generate finished gas, water vapor can be introduced into the adapter pipe through the steam pipe and is introduced into the hydrolyzer through the adapter pipe, and the finished gas in the hydrolyzer is heated; when the steam is introduced into the transfer pipe through the steam pipe, the pneumatic control valve is opened, the effect of adjusting the steam flow in the steam pipe is achieved through the pneumatic control valve, and the pneumatic control valve is adjusted by receiving a control signal of a control box control system, so that the pneumatic control valve accurately controls the supply amount of the steam; therefore, the heating temperature of the finished gas is accurately adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea hydrolysis to ammonia, and particularly relates to a steam direct injection heating system for product gas. Background Technique

[0002] In the process of urea hydrolysis to ammonia, product gas will be generated. The product gas mainly refers to the gas mixture generated after urea hydrolysis. The mixture mainly includes ammonia (NH3), carbon dioxide (CO2), water vapor (H2O) and other possible gas components, such as anti-corrosion air, etc. The product gas generated in the process of urea hydrolysis to ammonia needs to be maintained within a certain temperature range to maintain its stability and fluidity. Therefore, it is necessary to heat the generated product gas.

[0003] Currently, generally, the product gas is heated by introducing steam into the product gas to keep the product gas stable and fluid. However, when introducing steam into the product gas, generally, a pneumatic shut-off valve is used to control the flow rate of the introduced steam. The pneumatic shut-off valve requires a stable air pressure supply to ensure normal operation. If the air pressure is unstable or the supply is insufficient, it may affect the cutting speed and effect of the valve, thus unable to effectively control the flow rate of the steam, and further affecting the stability and safety of the entire system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a steam direct injection heating system for product gas to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A steam direct injection heating system for product gas, comprising:

[0006] A hydrolyzer, one end of the hydrolyzer is connected with a liquid inlet pipe for introducing urea solution, several gas-water separators are arranged on the surface of the hydrolyzer, the top of the hydrolyzer is connected with an SCR pipe, and the surface of the hydrolyzer is connected with a steam inlet assembly for heating the introduced product gas. The steam pipe of the steam inlet assembly is connected to the hydrolyzer, and a pneumatic regulating valve is arranged on the surface of the steam pipe so that the pneumatic regulating valve can more accurately control the flow rate of the steam in the steam pipe.

[0007] Preferably, the steam inlet assembly includes a first gate valve and a first check valve. Several groups of the first gate valve and the first check valve are arranged on the surface of the steam pipe. One end of the steam pipe is connected with a steam purging pipe, and the other end of the steam purging pipe is connected with a transfer pipe.

[0008] Preferably, one end of the transfer pipe is connected with the hydrolyzer, and a second gate valve and a second check valve are arranged on the surface of the transfer pipe.

[0009] Preferably, a branch pipe is connected to the surface of the adapter pipe, and a third check valve is provided on the surface of the branch pipe.

[0010] Preferably, a control box is provided on one side of the hydrolyzer.

[0011] Preferably, a manhole door is provided on the surface of the hydrolyzer.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: By pumping the urea solution into the liquid inlet pipe and introducing it into the hydrolyzer through the liquid inlet pipe, the urea solution is hydrolyzed to produce ammonia and generate finished gas through the hydrolyzer. Steam can be introduced into the adapter pipe through the steam pipe and then into the hydrolyzer to heat the finished gas in the hydrolyzer. When the steam is introduced into the adapter pipe through the steam pipe, the pneumatic control valve opens, and the pneumatic control valve plays a role in regulating the steam flow in the steam pipe. By receiving the control signal of the control system of the control box, the pneumatic control valve is adjusted to accurately control the supply amount of steam by the pneumatic control valve, thereby realizing the accurate adjustment of the heating temperature of the finished gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present utility model.

[0014] In the figure: 1, hydrolyzer; 2, liquid inlet pipe; 3, gas-water separator; 4, SCR pipe; 5, steam pipe; 6, pneumatic control valve; 7, first gate valve; 8, first check valve; 9, steam purging pipe; 10, adapter pipe; 11, second gate valve; 12, second check valve; 13, branch pipe; 14, third check valve; 15, control box; 16, manhole door. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] The present utility model provides a steam direct injection heating system for finished gas as shown in Figure 1 and includes:

[0017] Hydrolyzer 1, one end of the hydrolyzer 1 is connected to a liquid inlet pipe 2 for introducing urea solution, several gas-liquid separators 3 are arranged on the surface of the hydrolyzer 1, the top of the hydrolyzer 1 is connected to an SCR pipe 4, and the surface of the hydrolyzer 1 is connected with a steam inlet assembly for heating the incoming finished gas. The steam pipe 5 of the steam inlet assembly is connected to the hydrolyzer 1, and a pneumatic control valve 6 is arranged on the surface of the steam pipe 5 so that the pneumatic control valve 6 can more precisely control the steam flow in the steam pipe 5.

[0018] The steam inlet assembly includes a first gate valve 7 and a first check valve 8. Several groups of the first gate valve 7 and the first check valve 8 are arranged on the surface of the steam pipe 5. One end of the steam pipe 5 is connected to a steam purging pipe 9, and the other end of the steam purging pipe 9 is connected to a transfer pipe 10.

[0019] One end of the transfer pipe 10 is connected to the hydrolyzer 1, and a second gate valve 11 and a second check valve 12 are arranged on the surface of the transfer pipe 10. The first gate valve 7, the first check valve 8, the second gate valve 11, and the second check valve 12 can control the fluid flow direction of the steam and prevent backflow.

[0020] A branch pipe 13 is connected to the surface of the transfer pipe 10, and a third check valve 14 is arranged on the surface of the branch pipe 13, which is convenient for the excess steam to be discharged from the branch pipe 13, and the third check valve 14 prevents the steam from flowing back.

[0021] A control box 15 is arranged on one side of the hydrolyzer 1, and the control box 15 is used to monitor and control various valves in the heating process to ensure the safe and stable operation of the heating system.

[0022] A manhole door 16 is arranged on the surface of the hydrolyzer 1, through which the staff can enter the inside of the hydrolyzer 1 for inspection, maintenance or operation.

[0023] For this finished gas steam direct injection heating system, the urea solution is pumped into the liquid inlet pipe and introduced into the hydrolyzer 1 through the liquid inlet pipe, and a reducing agent is transported into the hydrolyzer 1 through the SCR pipe 4. The reducing agent in the SCR pipe 4 flows into the hydrolyzer 1. Therefore, the added reducing agent can react with NOx in the finished gas, thereby reducing the NOx content in the finished gas emission. The hydrolyzer 1 hydrolyzes the urea solution to produce ammonia and generate the finished gas. The water steam can be introduced into the transfer pipe 10 through the steam pipe 5 and then into the hydrolyzer 1 through the transfer pipe 10 to heat the finished gas in the hydrolyzer 1. When the water steam is introduced into the transfer pipe 10 through the steam pipe 5, the pneumatic control valve 6 is opened. The pneumatic control valve 6 plays a role in regulating the steam flow in the steam pipe 5. By receiving the control signal of the control system of the control box 15, the pneumatic control valve 6 is adjusted to precisely control the steam supply amount of the pneumatic control valve 6, thereby realizing the precise adjustment of the heating temperature of the finished gas.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A steam direct injection heating system for finished gas, characterized in that: include: A hydrolyzer (1), one end of the hydrolyzer (1) is connected to a liquid inlet pipe (2) for introducing urea solution, a plurality of gas-water separators (3) are arranged on the surface of the hydrolyzer (1), an SCR pipe (4) is connected to the top of the hydrolyzer (1), a steam inlet assembly for heating introduced finished gas is connected to the surface of the hydrolyzer (1), the steam inlet assembly is connected to the hydrolyzer (1) through a steam pipe (5) of the steam inlet assembly, and a pneumatic regulating valve (6) is arranged on the surface of the steam pipe (5) so that the pneumatic regulating valve (6) can more accurately control the flow rate of steam in the steam pipe (5).

2. A steam direct injection heating system for finished gas according to claim 1, characterized in that: The steam inlet assembly comprises a first gate valve (7) and a first check valve (8); the first gate valve (7) and the first check valve (8) are provided in a plurality of groups and are all arranged on the surface of a steam pipe (5); one end of the steam pipe (5) is connected to a steam purge pipe (9) and the other end of the steam purge pipe (9) is connected to a transfer pipe (10).

3. A steam direct injection heating system for finished gas according to claim 2, characterized in that: One end of the transfer tube (10) is connected to the hydrolyzer (1), and a second gate valve (11) and a second check valve (12) are provided on the surface of the transfer tube (10).

4. The steam direct injection heating system for finished gas according to claim 2, characterized in that: The surface of the transfer tube (10) is connected to a branch tube (13), and a third check valve (14) is provided on the surface of the branch tube (13).

5. The steam direct injection heating system for finished gas according to claim 1, characterized in that: A control box (15) is provided on one side of the hydrolyzer (1).

6. The steam direct injection heating system for finished gas according to claim 1, characterized in that: A manhole door (16) is provided on the surface of the hydrolyzer (1).

Images