System for preventing crystallization blockage of heat exchanger pipeline in phenol ammonia recovery

Abstract

The utility model discloses a system for preventing crystallization and blockage of a heat exchanger pipeline in phenol ammonia recovery, which is characterized in that the outlet end of a product gas water tank is communicated with the inlet end of a deacidification and deamination tower through a hot feeding pipeline, and the outlet end of the deacidification and deamination tower is communicated with the inlet end of an ammonia condensate tank through a pipeline; the liquid outlet end of the ammonia condensate tank is communicated with the middle of the hot feeding pipeline through a backflow pipeline, a first adjusting valve set is installed between the middle of the hot feeding pipeline and the inlet end of the deacidification and deamination tower, and the backflow pipeline is sequentially provided with a pump, a second adjusting valve set and a flow valve set in the flowing direction. The outlet end of the product gas water tank is connected with the inlet end of the heat exchanger through a pump; compared with an existing structure, liquid in the ammonia condensate tank directly flows back into the deacidification and deamination tower through the backflow pipeline to be subjected to deacidification and deamination treatment, the liquid does not flow into the product gas water tank any more, inflow of ammonia in the product gas water tank is reduced, water gas directly flows into the heat exchanger to be washed, and the heat exchange efficiency is improved. And the problem of heat exchanger pipeline blockage is avoided.

Description

Technical field:

[0001] The utility model relates to the technical field of coal chemical equipment, in particular to a system for preventing heat exchanger pipelines from being blocked by crystallization during phenol-ammonia recovery. Background technology:

[0002] The existing phenol-ammonia recovery device includes: a deacidification and deammonification tower and an ammonia condensate tank; the coal gas water in the factory will be deacidified and deammonified by the deacidification and deammonification tower, and after the treatment, ammonia and water vapor will be mixed and enter the ammonia condensate tank for condensation, and qualified ammonia will be discharged through a pipeline; unqualified ammonia and water vapor will form liquid ammonia condensate (ammonia water and water vapor) after condensation, and the ammonia condensate will enter the product coal gas water tank and mix with the coal gas water again, causing the ammonia content in the product coal gas water tank to increase continuously; part of the liquid mixed with ammonia condensate and coal gas water in the product coal gas water tank is pumped back to the deacidification and deammonification tower for deacidification and deammonification; the other part is pumped into the heat exchanger for washing. Since the water gas contains carbon dioxide, there is a defect that carbon dioxide and ammonia water react in the pipeline of the heat exchanger to form ammonium salt, and the pipeline is blocked due to the ammonium salt. Utility model content:

[0003] The utility model aims to provide a system for preventing crystallization and clogging of heat exchanger pipelines in phenol-ammonia recovery, so as to solve the problems raised in the above-mentioned background technology.

[0004] The utility model is implemented by the following technical solutions:

[0005] A system for preventing heat exchanger pipelines from being blocked by crystallization during phenol-ammonia recovery, comprising a product gas water tank, a deacidification and deammonification tower, an ammonia condensate tank, a first regulating valve group, a second regulating valve group, a flow valve group and a heat exchanger;

[0006] The outlet end of the product gas water tank is connected to the inlet end of the deacidification and deammonification tower through a hot feed pipeline, the outlet end of the deacidification and deammonification tower is connected to the inlet end of the ammonia condensate tank through a pipeline, the liquid outlet end of the ammonia condensate tank is connected to the middle of the hot feed pipeline through a reflux pipeline, a first regulating valve group is installed between the middle of the hot feed pipeline and the inlet end of the deacidification and deammonification tower, a pump, a second regulating valve group and a flow valve group are installed in sequence along the flow direction of the reflux pipeline, the outlet end of the product gas water tank is connected to the inlet end of the heat exchanger through a reflux pipeline, and a second regulating valve group is installed in sequence along the flow direction. The second regulating valve group comprises: a solenoid valve, two first isolating valves and a first bypass valve; the two first isolating valves are distributed on both sides of the solenoid valve, and the two ends of the first bypass valve are connected in parallel to the return pipeline outside the two first isolating valves; the flow valve group comprises: a flow meter, two second isolating valves and a second bypass valve; the two second isolating valves are distributed on both sides of the flow meter, and the two ends of the second bypass valve are connected in parallel to the return pipeline outside the two second isolating valves; the solenoid valve and the flow meter are electrically connected.

[0007] Preferably, a pump is installed on the hot feed pipeline.

[0008] Preferably, the first regulating valve group and the second regulating valve group have the same structure.

[0009] Preferably, the deacidification and deammonification tower and the ammonia condensate tank are part of a phenol-ammonia recovery device.

[0010] Advantages of the utility model: Compared with the existing structure, the present invention directly flows the liquid in the ammonia condensate tank back to the deacidification and deammonification tower through the reflux pipeline for deacidification and deammonification treatment, and no longer flows into the product gas water tank, thereby reducing the inflow of ammonia content in the product gas water tank. The water gas directly flows into the heat exchanger for washing, thereby avoiding the problem of heat exchanger pipeline blockage.

[0011] In the process of ammonia condensate directly flowing back to the deacidification and deammonification tower, it passes through the second regulating valve group and the flow valve group. The flow meter on the flow valve group transmits the flow rate of the ammonia condensate in the reflux pipeline to the solenoid valve on the second regulating valve group in the form of an electrical signal, and the flow rate of the reflux pipeline is controlled by the solenoid valve. Description of the drawings:

[0012] Figure 1 This is a schematic diagram of the existing structure;

[0013] Figure 2 It is a structural schematic diagram of the utility model.

[0014] In the figure: 1. product gas water tank, 101. hot feed pipeline, 2. deacidification and deammonification tower, 3. ammonia condensate tank, 102. reflux pipeline, 4. first regulating valve group, 5. second regulating valve group, 5.1. solenoid valve, 5.2. first isolation valve, 5.3. first bypass valve, 6. flow valve group, 6.1. flow meter, 6.2. second isolation valve, 6.3. second bypass valve, 7. heat exchanger. Specific implementation method:

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-2 The utility model provides a system technical solution for preventing heat exchanger pipeline crystallization and blockage in phenol-ammonia recovery:

[0017] A system for preventing heat exchanger pipelines from being blocked by crystallization during phenol-ammonia recovery comprises a product gas water tank 1, a deacidification and deammonification tower 2, an ammonia condensate tank 3, a first regulating valve group 4, a second regulating valve group 5, a flow valve group 6 and a heat exchanger 7; wherein the deacidification and deammonification tower 2 and the ammonia condensate tank 3 are part of a phenol-ammonia recovery device.

[0018] The outlet of the product gas water tank 1 and the inlet of the deacidification and deammonification tower 2 are connected through a hot feed pipeline 101, and a pump is installed on the hot feed pipeline 101. The outlet of the deacidification and deammonification tower 2 and the inlet of the ammonia condensate tank 3 are connected through a pipeline, and the liquid outlet of the ammonia condensate tank 3 is connected to the middle of the hot feed pipeline 101 through a reflux pipeline 102. A first regulating valve group 4 is installed between the middle of the hot feed pipeline 101 and the inlet of the deacidification and deammonification tower 2. A pump, a second regulating valve group 5 and a flow valve group 6 are installed in sequence along the flow direction of the reflux pipeline 102. The first regulating valve group 4 and the second regulating valve group 5 have the same structure. The outlet end of the product gas water tank 1 and the inlet end of the heat exchanger 7 are connected through a pump; the second regulating valve group 5 includes: a solenoid valve 5.1, two first isolation valves 5.2 and a first bypass valve 5.3; the two first isolation valves 5.2 are distributed on both sides of the solenoid valve 5.1, and the two ends of the first bypass valve 5.3 are connected in parallel to the return pipeline 102 outside the two first isolation valves 5.2; the flow valve group 6 includes: a flow meter 6.1, two second isolation valves 6.2 and a second bypass valve 6.3; the two second isolation valves 6.2 are distributed on both sides of the flow meter 6.1, and the two ends of the second bypass valve 6.3 are connected in parallel to the return pipeline 102 outside the two second isolation valves 6.2; the solenoid valve 5.1 and the flow meter 6.1 are electrically connected.

[0019] Compared with the existing structure, the present application directly flows the liquid in the ammonia condensate tank 3 back to the deacidification and deammonification tower 2 through the reflux pipeline 102 for deacidification and deammonification treatment, and no longer flows into the product gas water tank 1, thereby reducing the inflow of ammonia content in the product gas water tank 1. The water gas directly flows into the heat exchanger 7 for washing, thereby avoiding the problem of blockage of the heat exchanger 7 pipeline.

[0020] In the process of ammonia condensate directly flowing back to the deacidification and deammonification tower 2, it passes through the second regulating valve group 5 and the flow valve group 6. The flow meter 6.1 on the flow valve group 6 transmits the flow rate of the ammonia condensate in the reflux pipeline 102 to the solenoid valve 5.1 on the second regulating valve group 5 in the form of an electrical signal, and the flow rate of the reflux pipeline 102 is controlled by the solenoid valve 5.1.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for preventing heat exchanger pipeline crystallization blockage in phenol-ammonia recovery, characterized in that: It comprises a product gas water tank (1), a deacidification and deammonification tower (2), an ammonia condensate tank (3), a first regulating valve group (4), a second regulating valve group (5), a flow valve group (6) and a heat exchanger (7); The outlet end of the product gas water tank (1) and the inlet end of the deacidification and deammonification tower (2) are connected via a hot feed pipeline (101), the outlet end of the deacidification and deammonification tower (2) and the inlet end of the ammonia condensate tank (3) are connected via a pipeline, the liquid outlet end of the ammonia condensate tank (3) is connected via a reflux pipeline (102) to the middle of the hot feed pipeline (101), a first regulating valve group (4) is installed between the middle of the hot feed pipeline (101) and the inlet end of the deacidification and deammonification tower (2), the reflux pipeline (102) is sequentially installed with a pump, a second regulating valve group (5) and a flow valve group (6) along the flow direction, the outlet end of the product gas water tank (1) and the inlet end of the heat exchanger (7) are connected via a pump; the second regulating valve group (5) comprises: A solenoid valve (5.1), two first isolation valves (5.2) and a first bypass valve (5.3); the two first isolation valves (5.2) are distributed on both sides of the solenoid valve (5.1), and the two ends of the first bypass valve (5.3) are connected in parallel to a return pipeline (102) outside the two first isolation valves (5.2); the flow valve group (6) comprises: a flow meter (6.1), two second isolation valves (6.2) and a second bypass valve (6.3); the two second isolation valves (6.2) are distributed on both sides of the flow meter (6.1), and the two ends of the second bypass valve (6.3) are connected in parallel to the return pipeline (102) outside the two second isolation valves (6.2); the solenoid valve (5.1) and the flow meter (6.1) are electrically connected.

2. A system for preventing heat exchanger pipeline crystallization blockage in phenol-ammonia recovery according to claim 1, characterized in that: A pump is installed on the hot feed pipeline (101).

3. A system for preventing heat exchanger pipeline crystallization blockage in phenol-ammonia recovery according to claim 1, characterized in that: The first regulating valve group (4) and the second regulating valve group (5) have the same structure.

4. A system for preventing heat exchanger pipeline crystallization blockage in phenol-ammonia recovery according to claim 1, characterized in that: The deacidification and deammonification tower (2) and the ammonia condensate tank (3) are part of the phenol-ammonia recovery device.

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