A closed desulfurization liquid discharge system

Abstract

The utility model discloses a kind of desulfurization clear liquid closed type discharge systems, belong to gas purification discharge technical field, including sulfur melting kettle, the top liquid outlet of sulfur melting kettle is connected with spiral plate heat exchanger by metal pipe, another end of the spiral plate heat exchanger is connected with desulfurization liquid buffer tank by metal pipe, another end of the desulfurization liquid buffer tank is connected with spray tower by metal pipe, the spiral plate heat exchanger is used for the cooling treatment of sulfur melting kettle discharge clear liquid, the desulfurization liquid buffer tank is used for receiving cooled clear liquid and processing, the spray tower is used for processing desulfurization liquid buffer tank fugitive gas, ensure that discharge after reaching standard. Through the setting of closed structure, make sulfur melting kettle discharge hydrogen sulfide gas and clear liquid pass through spiral plate heat exchanger, desulfurization liquid buffer tank and spray tower in turn, make operating environment hydrogen sulfide concentration greatly reduce, eliminate personnel poisoning risk, simultaneously, clear liquid discharge temperature is cooled, eliminate high-temperature gas volatile source.

Description

Technical Field

[0001] This utility model relates to the field of gas purification and emission technology, specifically a closed emission system for desulfurized cleaning liquid. Background Technology

[0002] Wet desulfurization is a desulfurization method characterized by the desulfurization system being located at the end of the flue gas duct, after the dust collector. The reaction temperature of the desulfurization process is lower than the dew point, so the flue gas after desulfurization needs to be reheated before it can be discharged. Among them, the sulfur melting kettle is a key piece of equipment for sulfur recovery. The sulfur melting kettle is a chemical equipment used to process sulfur foam and recover sulfur. It is widely used in industries such as fertilizer, coking and coal chemical. This equipment melts sulfur paste through external heating, separates molten sulfur, and cools it into sulfur products.

[0003] The existing sulfur melting kettle has the following defects: the clear liquid at the top of the sulfur melting kettle is discharged continuously in an open manner, which causes a large amount of dissolved hydrogen sulfide to escape with the steam. The escaped hydrogen sulfide gas will corrode the indoor equipment and shorten the service life of the equipment. At the same time, the diffusion of hydrogen sulfide gas in the working environment seriously endangers the health of the operators.

[0004] Therefore, this utility model provides a closed-loop discharge system for desulfurized cleaning liquid to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] This invention provides a closed-loop discharge system for desulfurized cleaning liquid, which aims to solve the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a closed-loop discharge system for desulfurized liquid, comprising a sulfur melting kettle, wherein the top outlet of the sulfur melting kettle is connected to a spiral plate heat exchanger via a metal pipe, the other end of the spiral plate heat exchanger is connected to a desulfurized liquid buffer tank via a metal pipe, and the other end of the desulfurized liquid buffer tank is connected to a spray tower via a metal pipe. The spiral plate heat exchanger is used for cooling the liquid discharged from the sulfur melting kettle, the desulfurized liquid buffer tank is used for receiving and treating the cooled liquid, and the spray tower is used for treating the gas escaping from the desulfurized liquid buffer tank to ensure that the gas is discharged after meeting the standards.

[0009] As a preferred technical solution of this application, the top of the sulfur melting kettle is integrally provided with a liquid outlet pipe, and the liquid outlet pipe is used for flange sealing connection of the metal pipe. A steam supply pipe is integrally provided on one side of the sulfur melting kettle, and a steam valve is provided on the steam supply pipe.

[0010] As a preferred technical solution of this application, a pressure relief valve and a temperature and pressure transmitter are fixedly connected to the top of the sulfur melting kettle. The pressure relief valve is used for pressure relief inside the sulfur melting kettle, and the temperature and pressure transmitter is used for temperature and pressure detection inside the sulfur melting kettle. A manhole is also provided on the top of the sulfur melting kettle.

[0011] As a preferred technical solution of this application, the top of the spiral plate heat exchanger is provided with a cold source outlet pipe, the bottom of the spiral plate heat exchanger is provided with a heat source inlet pipe and a clear liquid drain valve, and the two sides of the spiral plate heat exchanger are respectively provided with a heat source outlet pipe and a cold source inlet pipe.

[0012] As a preferred technical solution of this application, the heat source inlet pipe and the metal pipe connecting the liquid outlet pipe are connected by a flange seal, and the heat source inlet pipe and the heat source outlet pipe are in a through structure. The cold source inlet pipe and the cold source outlet pipe are in a through structure, and the end of the cold source inlet pipe and the cold source outlet pipe away from the spiral plate heat exchanger is connected to an external circulating water supply module. The clear liquid drain valve is used for venting and maintenance inside the spiral plate heat exchanger.

[0013] As a preferred technical solution of this application, the end of the heat source outlet pipe away from the spiral plate heat exchanger is also flange-sealed with a metal pipe, and the other end of the metal pipe is flange-connected to the inlet end of the desulfurization liquid buffer tank, and a metal pipe is also flange-connected between the outlet end of the desulfurization liquid buffer tank and the inlet end of the spray tower.

[0014] (III) Beneficial Effects

[0015] The beneficial effects of this application are as follows: Through the design of a closed structure, the hydrogen sulfide gas and clear liquid discharged from the sulfur melting kettle pass sequentially through a spiral plate heat exchanger, a desulfurization liquid buffer tank, and a spray tower, which significantly reduces the concentration of hydrogen sulfide in the working environment, eliminating the risk of personnel poisoning. At the same time, the temperature of the clear liquid discharge is cooled to eliminate the source of high-temperature gas volatilization, further reducing the generation of hydrogen sulfide gas, improving equipment safety and extending service life. Pressure graded control is established, and when the pressure exceeds the predetermined value, the steam supply is cut off or the pressure is released in time, achieving zero overpressure accident rate, thereby improving the safety of equipment use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 This is a schematic diagram showing the connection structure of the desulfurization liquid buffer tank, spiral plate heat exchanger, and sulfur melting kettle of this utility model.

[0018] Figure 3 This is a schematic diagram of the overall structure of the spiral plate heat exchanger of this utility model.

[0019] Figure 4 This is a schematic diagram of the overall structure of the sulfur melting kettle of this utility model.

[0020] In the picture:

[0021] 1. Sulfur melting kettle; 11. Steam valve; 12. Liquid outlet pipe; 13. Pressure relief valve; 14. Temperature and pressure transmitter; 15. Manhole; 2. Spiral plate heat exchanger; 21. Heat source outlet pipe; 22. Heat source inlet pipe; 23. Clean liquid discharge valve; 24. Cold source inlet pipe; 25. Cold source outlet pipe; 3. Desulfurization liquid buffer tank; 4. Spray tower; 5. Metal pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-4 As shown, this utility model provides a closed-loop discharge system for desulfurized liquid, including a sulfur melting kettle 1. The top outlet of the sulfur melting kettle 1 is connected to a spiral plate heat exchanger 2 via a metal pipe 5. The other end of the spiral plate heat exchanger 2 is connected to a desulfurized liquid buffer tank 3 via a metal pipe 5. The other end of the desulfurized liquid buffer tank 3 is connected to a spray tower 4 via a metal pipe 5. The spiral plate heat exchanger 2 is used for cooling the liquid discharged from the sulfur melting kettle 1. The desulfurized liquid buffer tank 3 is used to receive and treat the cooled liquid. The spray tower 4 is used to treat the desulfurized liquid from the buffer tank. 3. Escaped gases are ensured to meet emission standards before being discharged. The high-temperature clear liquid generated during the operation of the sulfur melting kettle 1 is transported to the spiral plate heat exchanger 2 through the metal pipe 5. The spiral plate heat exchanger 2 cools the clear liquid to 45°C and then it enters the desulfurization liquid buffer tank 3. After the clear liquid is desulfurized in the desulfurization liquid buffer tank 3, the escaped gases are washed with alkaline solution in the spray tower 4 and then discharged. This avoids the diffusion of hydrogen sulfide gas in the working environment, avoids the impact on the health of the staff, avoids corrosion of the equipment, improves the safety of the working area, and extends the service life of the equipment.

[0024] Furthermore, the top of the sulfur melting kettle 1 is integrally equipped with an outlet pipe 12, which is used for flange sealing connection of the metal pipe 5. A steam supply pipe is integrally equipped on one side of the sulfur melting kettle 1, and a steam valve 11 is installed on the steam supply pipe. A pressure relief valve 13 and a temperature and pressure transmitter 14 are also fixedly connected to the top of the sulfur melting kettle 1. The pressure relief valve 13 is used for pressure relief inside the sulfur melting kettle 1, and the temperature and pressure transmitter 14 is used for temperature and pressure detection inside the sulfur melting kettle 1. A manhole 15 is also provided on the top of the sulfur melting kettle 1. When the temperature and pressure transmitter 14 monitors the pressure inside the sulfur melting kettle 1 in real time, the steam valve 11 is immediately closed when the pressure is ≥0.4MPa. If the pressure continues to rise to ≥0.45MPa, the pressure relief valve 13 automatically starts to release pressure. Through its dual protection, the pressure of the sulfur melting kettle 1 is prevented from being too high and affecting its safety. The pressure relief valve 13 is calibrated, and the start-up pressure is tested every quarter to ensure the accuracy of its pressure relief.

[0025] Furthermore, a cold source outlet pipe 25 is provided at the top of the spiral plate heat exchanger 2, and a heat source inlet pipe 22 and a clear liquid drain valve 23 are provided at the bottom of the spiral plate heat exchanger 2. A heat source outlet pipe 21 and a cold source inlet pipe 24 are respectively provided on both sides of the spiral plate heat exchanger 2. The heat source inlet pipe 22 is flange-sealed to the metal pipe 5 connecting to the liquid outlet pipe 12, and the heat source inlet pipe 22 and the heat source outlet pipe 21 are in a through-type structure. The cold source inlet pipe 24 and the cold source outlet pipe 25 are in a through-type structure, and the ends of the cold source inlet pipe 24 and the cold source outlet pipe 25 away from the spiral plate heat exchanger 2 are connected to an external circulating water supply mold. The set of clear liquid drain valve 23 is used for venting and maintenance inside the spiral plate heat exchanger 2. Through the setting of the spiral plate heat exchanger 2, when the high temperature clear liquid enters the spiral plate heat exchanger 2, it can cooperate with the connection of the external circulating water supply module of the spiral plate heat exchanger 2 to realize the circulation supply of the cooling source in conjunction with the cold source inlet pipe 24 and the cold source outlet pipe 25, thereby realizing the cooling and cooling of the heat source inside the spiral plate heat exchanger 2. This allows the heat source discharged from the heat source outlet pipe 21 to be fully cooled, avoiding the volatilization of gas caused by high temperature. The cooling water flow rate inside the spiral plate heat exchanger 2 is dynamically adjusted according to the clear liquid flow rate to ensure the high efficiency of cooling of the high temperature clear liquid.

[0026] Furthermore, a metal pipe 5 is flange-sealed at one end of the heat source outlet pipe 21 away from the spiral plate heat exchanger 2, and the other end of the metal pipe 5 is flange-connected to the inlet end of the desulfurization liquid buffer tank 3. A metal pipe 5 is also flange-connected between the outlet end of the desulfurization liquid buffer tank 3 and the inlet end of the spray tower 4.

[0027] Working principle: The original open discharge pipe of the sulfur melting kettle 1 is removed, and a pressure-resistant stainless steel metal pipe 5 is installed and connected to the inlet of the spiral plate heat exchanger 2. After the high-temperature clear liquid discharged from the sulfur melting kettle 1 is cooled by the spiral plate heat exchanger 2, the cooled clear liquid is guided to the interior of the desulfurization liquid buffer tank 3. The exhaust port at the top of the desulfurization liquid buffer tank 3 is connected to the inlet of the spray tower 4. The gas is discharged after being washed with alkaline solution to ensure the qualification of the discharged gas. The temperature and pressure transmitter 14 signals are connected to the DCS system for linkage control of the steam valve 11 to prevent the continuous supply of steam from causing overpressure inside the sulfur melting kettle 1 when the internal pressure exceeds the predetermined value.

[0028] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A closed-loop discharge system for desulfurized cleaning liquid, characterized in that: The system includes a sulfur melting kettle (1), with a spiral plate heat exchanger (2) connected to the top outlet of the sulfur melting kettle (1) via a metal pipe (5). The other end of the spiral plate heat exchanger (2) is connected to a desulfurization liquid buffer tank (3) via a metal pipe (5). The other end of the desulfurization liquid buffer tank (3) is connected to a spray tower (4) via a metal pipe (5). The spiral plate heat exchanger (2) is used for cooling the clear liquid discharged from the sulfur melting kettle (1). The desulfurization liquid buffer tank (3) is used to receive and process the cooled clear liquid. The spray tower (4) is used to treat the gas escaping from the desulfurization liquid buffer tank (3) to ensure that it meets the emission standards before being discharged.

2. The closed-loop discharge system for desulfurized cleaning liquid according to claim 1, characterized in that: The top of the sulfur melting kettle (1) is integrally provided with a liquid outlet pipe (12), and the liquid outlet pipe (12) is used for flange sealing connection of the metal pipe (5). A steam supply pipe is integrally provided on one side of the sulfur melting kettle (1), and a steam valve (11) is provided on the steam supply pipe.

3. The closed-loop discharge system for desulfurized cleaning liquid according to claim 2, characterized in that: The top of the sulfur melting kettle (1) is also fixedly connected to a pressure relief valve (13) and a temperature and pressure transmitter (14). The pressure relief valve (13) is used for pressure relief inside the sulfur melting kettle (1), and the temperature and pressure transmitter (14) is used for temperature and pressure detection inside the sulfur melting kettle (1). The top of the sulfur melting kettle (1) is also provided with a manhole (15).

4. The closed-loop discharge system for desulfurized cleaning liquid according to claim 1, characterized in that: The spiral plate heat exchanger (2) is provided with a cold source outlet pipe (25) at the top, a heat source inlet pipe (22) and a clear liquid drain valve (23) at the bottom, and a heat source outlet pipe (21) and a cold source inlet pipe (24) are provided on both sides of the spiral plate heat exchanger (2).

5. The closed-loop discharge system for desulfurized cleaning liquid according to claim 4, characterized in that: The heat source inlet pipe (22) is connected to the metal pipe (5) that connects to the liquid outlet pipe (12) by a flange seal, and the heat source inlet pipe (22) and the heat source outlet pipe (21) are in a through structure. The cold source inlet pipe (24) and the cold source outlet pipe (25) are in a through structure, and the end of the cold source inlet pipe (24) and the cold source outlet pipe (25) away from the spiral plate heat exchanger (2) is connected to an external circulating water supply module. The clear liquid drain valve (23) is used for venting and maintenance inside the spiral plate heat exchanger (2).

6. The closed-loop discharge system for desulfurized cleaning liquid according to claim 4, characterized in that: The heat source outlet pipe (21) is flange-sealed with a metal pipe (5) at one end away from the spiral plate heat exchanger (2), and the other end of the metal pipe (5) is flange-connected to the inlet end of the desulfurization liquid buffer tank (3), and a metal pipe (5) is also flange-connected between the outlet end of the desulfurization liquid buffer tank (3) and the inlet end of the spray tower (4).

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