Mother liquor tank for automatic separation of acid tar and mother liquor
The automatic separation of acid tar and mother liquor in the mother liquor tank, using a closed structure and screw conveyor, solves the problems of equipment blockage and environmental pollution caused by tar accumulation in ammonium sulfate production, and improves separation efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI PINGYAO NO 1 MINE COKING CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-06-30
Smart Images
Figure CN224422045U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ammonium sulfate mother liquor tank technology, and in particular to a mother liquor tank that automatically separates acid tar and mother liquor. Background Technology
[0002] In the production of ammonium sulfate in the coking industry, the sulfuric acid used to absorb ammonia from coal gas is called sulfuric acid mother liquor, or simply mother liquor. The mother liquor tank is a crucial piece of equipment in ammonium sulfate production. Its main functions include: providing temporary storage and circulating mother liquor; providing buffer capacity for the system; balancing production fluctuations and regulating production continuity; maintaining supersaturation and controlling solution supersaturation to promote continuous crystal growth; separating crystals from the mother liquor for recycling and improving ammonium sulfate yield; and balancing pH levels to reduce wastewater discharge.
[0003] In ammonium sulfate production, residual tar and coke powder in the coal gas accumulate in the saturator. The saturator has a tar outlet, but some tar and coke powder enter the full-flow tank with the mother liquor. Tar and coke powder not processed in time in the full-flow tank will circulate into the mother liquor tank with the mother liquor. Additionally, residual tar and coke powder in the coal gas after the saturator enter the ammonium sulfate section's ground tank with the coal gas coolant, and will circulate into the mother liquor tank with the mother liquor.
[0004] Excessive residual tar and coke powder in the ammonium sulfate section can clog equipment, interfere with crystallization, reduce the size of finished crystal particles, and decrease the whiteness of the finished product. Some of the tar and coke powder can react with the mother liquor in the saturator to form acid tar, which corrodes the equipment. It can also increase the viscosity of the mother liquor, cause fluctuations in the composition of the mother liquor, affect the efficiency of ammonia absorption, and reduce the yield of ammonium sulfate.
[0005] The tar and coke powder in the mother liquor tank are usually removed manually using a strainer. This method is inefficient and causes the mother liquor to surge during the removal process, resulting in incomplete removal. When the lid is opened for removal, VOCs overflow, which not only causes environmental pollution but also endangers human health. Summary of the Invention
[0006] To solve the above-mentioned technical problems, this utility model provides a mother liquor tank for automatically separating acid tar and mother liquor. The technical solution of this utility model is as follows:
[0007] An automatic mother liquor tank for separating acid tar and mother liquor includes a tank body, which is a closed structure. A partition is installed inside the tank body, dividing it into a separation zone and a mother liquor zone. The separation zone and the mother liquor zone are connected by a connecting pipe equipped with a valve. A full-flow tank mixed liquor inlet, connected to the outlet of a full-flow tank, is installed on the upper side of one side of the tank body. The full-flow tank mixed liquor inlet extends into the separation zone and is connected to a mixed liquor inlet pipe located within the separation zone. A crystallization chamber mixed liquor inlet, a high-level tank mixed liquor inlet, and a ground tank mixed liquor inlet are installed on one side of the top surface of the tank body, along with an ultrasonic level gauge orifice and a discharge port. The liquid inlet, ultrasonic level gauge hole, and discharge port are all located in the separation zone. An ultrasonic level gauge is installed inside the ultrasonic level gauge hole. A screw conveyor is installed through the upper part of the separation zone, and a screw conveyor outlet is installed at the end of the screw conveyor. Several screw conveyor observation holes are opened on the top surface of the tank corresponding to the screw conveyor. Several mixed liquid observation holes, several separated liquid observation holes, and mother liquor observation holes are opened on the top surface of the tank. The mixed liquid observation holes and separated liquid observation holes are all located in the separation zone and are located on both sides of the screw conveyor, respectively. The mother liquor observation hole is located in the mother liquor zone. A mother liquor outlet is installed at the bottom of the other side of the tank and is located in the mother liquor zone. A vent and a manhole are installed at the bottom of one side of the tank and are both located in the mother liquor zone.
[0008] Preferably, the inlet pipe of the mixture is arc-shaped, and the outlet is located at the top of the separation zone.
[0009] Preferably, the front end of the screw conveyor is connected to a power source.
[0010] Preferably, the connecting pipe is higher than the mother liquor outlet.
[0011] Preferably, a three-way valve is provided outside the mother liquor outlet, which is connected to the small mother liquor circulation pump and the ground tank respectively; the vent is connected to the ground tank.
[0012] Preferably, the mixing liquid inlet of the crystallization chamber, the mixing liquid inlet of the elevated tank, and the mixing liquid inlet of the ground tank extend into the tank body and are located below the liquid surface.
[0013] Preferably, the observation holes of the screw conveyor, the mixed liquid, the separated liquid, and the mother liquor are all sealed with transparent explosion-proof glass.
[0014] Preferably, the partition is a vertical plate or an arc-shaped plate.
[0015] Preferably, the tank body is made of fiberglass.
[0016] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.
[0017] The beneficial effects of this utility model through the above solution are as follows:
[0018] The mother liquor / tar and coke powder mixture from the full-flow tank, crystallization chamber, elevated tank, and ground tank enters the separation zone in the tank body through the mixture inlet of the full-flow tank, the mixture inlet of the crystallization chamber, the mixture inlet of the elevated tank, and the mixture inlet of the ground tank, respectively. The separated tar and coke powder are automatically discharged through a screw conveyor, and the separated mother liquor enters the mother liquor zone through a connecting pipe. This solves the problems of low separation efficiency and low retrieval efficiency of the mother liquor / tar and coke powder mixture. The automatic separation eliminates the need for frequent manual opening of the mother liquor tank, and the VOCs outlet at the top reduces environmental pollution and solves the problem of the impact of VOCs on the health of employees.
[0019] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0020] Figure 1 This is the front view of this utility model.
[0021] Figure 2 yes Figure 1 Top view.
[0022] In the diagram: 1-Tank body; 2-Baffle plate; 3-Mixed liquid inlet pipe; 4-Screw conveyor; 5-Screw conveyor observation hole; 6-Connecting pipe; 7-Connecting pipe valve; 8-Mixed liquid observation hole; 9-Separated liquid observation hole; 10-Mother liquor observation hole; A1-Full flow tank mixed liquid inlet; A2-Crystallization chamber mixed liquid inlet; A3-High-position tank mixed liquid inlet; A4-Ground tank mixed liquid inlet; B1-Mother liquor outlet; B2-Screw conveyor outlet; B3-Vent port; C-Ultrasonic level gauge hole; F-VOCs emission port; M-Manhole; SZ-Separation zone; ML-Mother liquor zone. Detailed Implementation
[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.
[0024] like Figure 1 and Figure 2As shown, the automatic mother liquor tank for separating acid tar and mother liquor provided by this utility model includes a tank body 1, which is a closed structure. A partition 2 is fixedly installed inside the tank body 1, dividing the tank body 1 into a separation zone SZ and a mother liquor zone. The separation zone SZ and the mother liquor zone are connected by a connecting pipe 6, and a connecting pipe valve 7 is installed on the connecting pipe 6. A full-flow tank mixed liquor inlet A1, which is connected to the outlet of the full-flow tank, is fixedly installed on the upper side of one side of the tank body 1. The full-flow tank mixed liquor inlet A1 extends into the separation zone SZ and is fixedly connected to a mixed liquor inlet pipe 3, which is located inside the separation zone SZ. A crystallization chamber mixed liquor inlet A2, which is connected to the crystallization chamber, an elevated tank mixed liquor inlet A3, which is connected to the elevated tank, and a ground tank mixed liquor inlet A4, an ultrasonic level gauge hole C, and a VOCs emission port F are fixedly installed on one side of the top surface of the tank body 1. The crystallization chamber mixed liquor inlet A2, the elevated tank mixed liquor inlet A3, and the ground tank mixed liquor inlet A4 are connected to the ground tank. The tank's mixed liquid inlet A4, ultrasonic level gauge hole C, and VOCs emission outlet F are all located in the separation zone SZ. An ultrasonic level gauge is installed inside the ultrasonic level gauge hole C. A screw conveyor 4 is installed through and sealed at the top of the separation zone SZ. A screw conveyor outlet B2 is fixedly installed at the end of the screw conveyor 4. Several screw conveyor observation holes 5 are opened on the top surface of the tank 1 at positions corresponding to the screw conveyor 4. Several mixed liquid observation holes 8, several separated liquid observation holes 9, and mother liquor observation holes 10 are opened on the top surface of the tank 1. The mixed liquid observation holes 8 and separated liquid observation holes 9 are both located in the separation zone SZ and are located on both sides of the screw conveyor 4, respectively. The mother liquor observation hole 10 is located in the mother liquor zone. A mother liquor outlet B1 is fixedly installed at the bottom of the other side of the tank 1. The mother liquor outlet B1 is located in the mother liquor zone. A vent B3 and a manhole M are fixedly installed at the bottom of one side of the tank 1. Both the vent B3 and the manhole M are located in the mother liquor zone.
[0025] The power sources for both the ultrasonic level gauge and the screw conveyor 4 are electrically connected to the controller. The controller can be a PLC, a microcontroller, or similar device.
[0026] Preferably, the inlet pipe 3 of the mixed liquid is arc-shaped and the outlet is located at the upper part of the separation zone SZ, so that the entering mixed liquid is located at the upper part of the separation zone SZ, providing space for the separation of mother liquor / tar and coke powder.
[0027] Preferably, the front end of the screw conveyor 4 is connected to a power source, which is used to control whether the screw conveyor 4 is working or not.
[0028] Preferably, the connecting pipe 6 is higher than the mother liquor outlet B1.
[0029] Preferably, a three-way valve is provided outside the mother liquor outlet B1, which is connected to the small mother liquor circulation pump and the ground tank respectively; the vent outlet B3 is connected to the ground tank.
[0030] Preferably, the crystallization chamber mixture inlet A2, the elevated tank mixture inlet A3, and the ground tank mixture inlet A4 extend into the tank body 1 and are located below the liquid surface.
[0031] Preferably, the observation holes 5, 8, 9, and 10 of the screw conveyor are all enclosed by transparent explosion-proof glass to facilitate observation of the separation process, and are all equipped with liquid sealing devices to prevent VOCs from escaping.
[0032] Preferably, the partition 2 is a vertical plate or an arc-shaped plate.
[0033] Preferably, the tank body 1 is made of fiberglass, which makes the device relatively light and corrosion resistant, making it suitable as the main structure of the mother liquor tank.
[0034] In use, the mother liquor / tar / coke powder mixture from the full-flow tank, crystallization chamber, elevated tank, and ground tank enters the separation zone SZ in tank 1 through the full-flow tank mixture inlet A1, crystallization chamber mixture inlet A2, elevated tank mixture inlet A3, and ground tank mixture inlet A4, respectively. Specifically, the inlets of the full-flow tank mixture inlet A1, crystallization chamber mixture inlet A2, elevated tank mixture inlet A3, and ground tank mixture inlet A4 must be located in the upper part of the separation zone SZ to accelerate the separation of the mixture and prevent the mixture from surging due to the impact of the inlet liquid on the liquid surface. Since the density of tar / coke powder is lower than that of the mother liquor, the upper part of the separation surface is tar / coke powder, and the lower part is the mother liquor.
[0035] The screw conveyor 4 has its two ends (front and rear) positioned outside the tank 1, serving to fix it in place. The front end connects to the power source, and the rear end has the screw conveyor outlet B2. Specifically, when the screw conveyor 4 is sealed and installed on the tank 1, the gap between the tank 1 and the screw conveyor 4 can be filled with fiberglass. When the ultrasonic level gauge installed in the ultrasonic level gauge hole C detects that the liquid level in the separation zone SZ reaches above the screw conveyor 4, the controller automatically starts the screw conveyor 4. The tar and coke powder located above enter from above the screw conveyor 4 and are discharged through the screw conveyor outlet B2. The screw conveyor observation hole 5 allows real-time monitoring of the screw conveyor 4's conveying status. Poor conveying conditions or blockages can be addressed through the observation hole 5. The mixed liquid observation hole 8 is located at the front of the screw conveyor observation hole 5 to observe the tar content in the mixed liquid, and the separated liquid observation hole 9 is located behind the screw conveyor observation hole 5 to observe the separated liquid and determine whether the connecting pipe valve 7 can be opened.
[0036] Below the separation surface in separation zone SZ is the separated mother liquor. After the screw conveyor 4 starts and the tar separation is deemed satisfactory via the separation liquid observation port 9, the valve 7 connecting separation zone SZ and mother liquor zone ML can be opened, allowing the mother liquor to enter mother liquor zone ML through the connecting pipe 6. The mother liquor is sent to the ammonium sulfate saturator through mother liquor zone outlet B1, or discharged into the vent tank during maintenance. The mother liquor observation port 10 allows real-time monitoring of the mother liquor condition. If residual tar in the mother liquor requires further separation, it can be handled through the mother liquor observation port 10. Additionally, the mother liquor observation port 10 can be used as a manhole for maintenance of mother liquor zone ML. Manhole M is used for maintenance and inspection; vent port B3 is used to discharge residual mixed liquor; and VOCs emission port F is used for VOCs treatment.
[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A mother liquor tank for automatically separating acid tar and mother liquor, characterized in that, The tank (1) is a closed structure. A partition (2) is installed inside the tank (1), which divides the tank (1) into a separation zone (SZ) and a mother liquor zone (ML). The separation zone (SZ) and the mother liquor zone (ML) are connected by a connecting pipe (6). A connecting pipe valve (7) is installed on the connecting pipe (6). A full-flow tank mixed liquid inlet (A1) is installed on the upper side of one side of the tank (1) and connects to the outlet of the full-flow tank. The full-flow tank mixed liquid inlet (A1) extends into the separation zone (SZ) and is connected to the mother liquor zone (ML). A mixed liquid inlet pipe (3) is connected to the tank. The mixed liquid inlet pipe (3) is located in the separation zone (SZ). On one side of the top surface of the tank body (1), there are a mixed liquid inlet (A2) for the crystallization chamber connected to the crystallization chamber, a mixed liquid inlet (A3) for the elevated tank connected to the elevated tank, a mixed liquid inlet (A4) for the ground tank connected to the ground tank, an ultrasonic level gauge hole (C), and a VOCs emission port (F). Both (C) and VOCs emission outlet (F) are located in the separation zone (SZ). An ultrasonic level gauge is installed in the ultrasonic level gauge hole (C). A screw conveyor (4) is installed through the upper part of the separation zone (SZ). A screw conveyor outlet (B2) is installed at the end of the screw conveyor (4). Several screw conveyor observation holes (5) are opened on the top surface of the tank (1) at positions corresponding to the screw conveyor (4). Several mixed liquid observation holes (8) and several separated liquid observation holes are opened on the top surface of the tank (1). (9) and mother liquor observation hole (10), mixed liquid observation hole (8) and liquid separation observation hole (9) are both located in the separation zone (SZ) and are located on both sides of the screw conveyor (4). Mother liquor observation hole (10) is located in the mother liquor zone (ML). Mother liquor outlet (B1) is installed at the bottom of the other side of the tank (1). Mother liquor outlet (B1) is located in the mother liquor zone (ML). Vent (B3) and manhole (M) are installed at the bottom of one side of the tank (1). Vent (B3) and manhole (M) are both located in the mother liquor zone (ML).
2. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The inlet pipe (3) of the mixture is arc-shaped, and the outlet is located at the top of the separation zone (SZ).
3. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The front end of the screw conveyor (4) is connected to a power source.
4. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The connecting pipe (6) is higher than the mother liquor outlet (B1).
5. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, A three-way valve is provided outside the mother liquor outlet (B1) to connect the small mother liquor circulation pump and the ground tank respectively; the vent (B3) is connected to the ground tank.
6. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The crystallization chamber mixing liquid inlet (A2), the elevated tank mixing liquid inlet (A3), and the ground tank mixing liquid inlet (A4) extend into the tank body (1) and are located below the liquid surface.
7. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The observation holes (5), (8), (9), and (10) of the screw conveyor are all sealed with transparent explosion-proof glass.
8. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The partition (2) is a vertical plate or an arc-shaped plate.
9. The mother liquor tank for automatically separating acid tar and mother liquor according to claim 1, characterized in that, The material of the tank (1) is fiberglass.