Calcium carbide furnace tail gas purification system

Abstract

The utility model belongs to the technical field of calcium carbide furnace tail gas treatment, and relates to a calcium carbide furnace tail gas purification system which comprises a dust removal assembly, an ash storage bin, a nitrogen conveying assembly, a pneumatic conveying assembly and a pressure transmitter. The dust removal assembly communicates with the calcium carbide furnace tail gas outlet end. The ash storage bin is communicated with the outlet end of the dust removal assembly; the nitrogen conveying assembly is communicated with the dust removal assembly and the ash storage bin through connecting pipelines; the pneumatic conveying assembly is communicated with the outlet end of the ash storage bin; the pressure transmitter is connected with the ash storage bin and used for detecting the pressure value in the ash storage bin in real time. According to the pressure transmitter, the pressure value in the ash storage bin can be conveniently detected in real time, in the key operation processes of nitrogen replacement, pressure leakage testing, pneumatic conveying bin pump pressure building and the like, an operator can conveniently and accurately control the nitrogen amount according to the real-time pressure value in the ash storage bin, the explosion risk is reduced, and the safety of the operator and equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to calcium carbide furnace tail gas treatment technical field, specifically related to a calcium carbide furnace tail gas purification system. BACKGROUND

[0002] In the calcium carbide production process, calcium carbide furnace as the core equipment, its stable operation is important to the efficiency and safety of the whole production process. Calcium carbide furnace in the operation process will produce a large amount of tail gas, these tail gas often contains harmful substances, if direct emission not only will cause pollution to the environment, also can constitute the threat to the health of operating personnel. Therefore, the introduction of calcium carbide furnace tail gas purification system becomes an important link in the calcium carbide production process.

[0003] Calcium carbide furnace tail gas purification system usually includes multiple components, wherein the ash storage bin is as the junction of purification unit and pneumatic conveying unit, its running state often directly influences the stable operation of the whole purification system. To ensure the normal operation of ash storage bin, nitrogen replacement, pressure test and pneumatic conveying bin pump pressure holding and other key operations are needed.

[0004] Nitrogen replacement is by replacing the air or combustible gas in the ash storage bin, reduces its reaction with tail gas composition and leads to the risk of explosion. In the nitrogen replacement operation, if the nitrogen amount is insufficient, the air or combustible gas in the ash storage bin cannot be effectively replaced, thereby increasing the risk of explosion; if the nitrogen amount is too much, the pressure in the ash storage bin is too large, the explosion-proof sheet inside the ash storage bin is damaged, and then the air enters the purification system and mixes with the tail gas, which also increases the risk of explosion.

[0005] Pressure test is carried out after nitrogen replacement to check the sealing performance of the ash storage bin, to ensure the nitrogen replacement effect. In the pressure test operation, the inaccurate control of nitrogen amount can easily lead to inaccurate test results, so that the leakage point of the ash storage bin cannot be found in time, affecting the overall sealing performance of the purification system.

[0006] In the pneumatic conveying unit, the bin pump is used to convey the dust particles in the ash storage bin to other treatment equipment, and the pneumatic conveying bin pump pressure holding is to hold the pressure of the bin pump before pneumatic conveying, to prevent the pipeline from being blocked or damaged due to excessive pressure in the conveying process. In the pneumatic conveying bin pump pressure holding operation, the inaccurate control of nitrogen amount can cause the pressure in the bin pump to be too large, causing the blockage or damage of the conveying pipeline, and affecting the normal operation of the purification system.

[0007] The prior art has certain research on the calcium carbide furnace tail gas purification system, referring to the patent document with the application number 201710006176.1, which discloses an electric dust removal hopper device with a material level meter, comprising a hopper body, a dust storage bin, a material level meter and a cleaning device; by vertically installing the material level meter in the hopper body, all-weather and continuous measurement can be realized, in addition, by means of the cleaning device, the detection probe part of the material level meter can be cleaned in real time according to the need, and the detection sensitivity caused by the accumulation of dust on the probe is reduced.

[0008] However, during the key operation processes such as nitrogen replacement, pressure test leakage and pneumatic conveying bin pump pressure holding, the operating personnel cannot obtain the pressure value in the dust storage bin, and thus cannot accurately control the nitrogen quantity according to the pressure value in the dust storage bin, which increases the risk of explosion and affects the safety of operating personnel and equipment. Practical new type content

[0009] In order to solve the technical problem that the operating personnel cannot obtain the pressure value in the dust storage bin and cannot accurately control the nitrogen quantity, which increases the risk of explosion in the background art, the utility model provides a calcium carbide furnace tail gas purification system.

[0010] The pressure transmitter arranged in the calcium carbide furnace tail gas purification system of the utility model is convenient for real-time detection of the pressure value in the dust storage bin, and during the key operation processes such as nitrogen replacement, pressure test leakage and pneumatic conveying bin pump pressure holding, it is convenient for the operating personnel to accurately control the nitrogen quantity according to the real-time pressure value in the dust storage bin, which reduces the risk of explosion and ensures the safety of operating personnel and equipment.

[0011] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0012] A calcium carbide furnace tail gas purification system, comprising a dust removal assembly, a dust storage bin, a nitrogen conveying assembly, a pneumatic conveying assembly and a pressure transmitter; the dust removal assembly is communicated with the outlet end of the calcium carbide furnace tail gas and is used for removing dust in the calcium carbide furnace tail gas; the dust storage bin is communicated with the outlet end of the dust removal assembly and is used for storing dust removed from the calcium carbide furnace tail gas; the nitrogen conveying assembly is communicated with the dust removal assembly and the dust storage bin through a connecting pipeline and is used for inputting nitrogen into the dust storage bin through the connecting pipeline; the pneumatic conveying assembly is communicated with the outlet end of the dust storage bin and is used for conveying dust in the dust storage bin to subsequent processing equipment; the pressure transmitter is connected with the dust storage bin and is used for real-time detection of the pressure value in the dust storage bin.

[0013] In a specific implementable scheme, the calcium carbide furnace tail gas purification system further comprises a controller and a display; the controller is connected with the pressure transmitter and is used for receiving the pressure value in the dust storage bin detected by the pressure transmitter in real time; the display is connected with the controller and is used for displaying the real-time pressure value in the dust storage bin.

[0014] In an embodiment, the controller is HollySys-MACS6.5.4.

[0015] In an embodiment, a sampling pipe is connected to the top of the side of the ash storage bin, the sampling pipe is in communication with the inner cavity of the ash storage bin, and the pressure transmitter is installed on the sampling pipe.

[0016] In an embodiment, a maintenance ball valve is installed on the sampling pipe.

[0017] In an embodiment, the signal transmission between the controller and the pressure transmitter is wired transmission or wireless transmission.

[0018] In an embodiment, the nitrogen delivery assembly comprises a nitrogen delivery source and a nitrogen delivery pipeline; the nitrogen delivery source is in communication with the nitrogen delivery pipeline for injecting nitrogen into the nitrogen delivery pipeline; and the outlet end of the nitrogen delivery pipeline is in communication with the connecting pipeline.

[0019] In an embodiment, the dust removal assembly comprises a plurality of dust collectors, the outlet ends of the plurality of dust collectors are in communication with the inlet end of the ash storage bin, and the plurality of dust collectors are in communication with the connecting pipeline.

[0020] In an embodiment, the pneumatic conveying assembly comprises an ash discharge pipeline and a pneumatic conveying bin pump; the ash discharge pipeline is in communication with the outlet end of the ash storage bin; and the pneumatic conveying bin pump is in communication with the ash discharge pipeline for conveying the dust in the ash storage bin to subsequent processing equipment by using air flow.

[0021] In an embodiment, an explosion-proof valve is installed on the ash storage bin.

[0022] In summary, the utility model has the following beneficial technical effects:

[0023] 1. The calcium carbide furnace tail gas purification system is provided with a pressure transmitter, which is convenient for real-time detection of the pressure value in the ash storage bin, and in the key operation processes such as nitrogen replacement, pressure test leakage, and pneumatic conveying bin pump pressure holding, the operator can accurately control the nitrogen amount according to the real-time pressure value in the ash storage bin, the risk of explosion is reduced, and the safety of the operator and the equipment is ensured.

[0024] 2. The calcium carbide furnace tail gas purification system is provided with a controller and a display, which are convenient for the operator to remotely and real-time monitor the pressure value in the ash storage bin, and in the key operation processes such as nitrogen replacement, pressure test leakage, and pneumatic conveying bin pump pressure holding, the operator can accurately control the nitrogen amount in time according to the pressure value in the ash storage bin, the risk of explosion is further reduced, the operation is convenient, and the working efficiency of the calcium carbide furnace tail gas purification system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the calcium carbide furnace exhaust gas purification system of this utility model.

[0026] Explanation of reference numerals in the attached diagram: 1. Ash storage silo; 2. Connecting pipe; 3. Pressure transmitter; 4. Sampling pipe; 5. Nitrogen delivery pipe; 6. Dust collector; 7. Explosion-proof valve; 8. Ash discharge pipe; 9. Pneumatic conveying silo pump. Detailed Implementation

[0027] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings and embodiments, but this utility model is not limited to the embodiments described below.

[0028] In calcium carbide furnace exhaust gas treatment systems, during critical operations such as nitrogen purging, pressure testing, and pressurization of the pneumatic conveying silo pump, operators cannot obtain real-time pressure values ​​within the ash storage silo 1. Consequently, they cannot accurately control the nitrogen flow based on this pressure, increasing the risk of explosion due to air mixing with the calcium carbide furnace exhaust gas. This invention aims to provide a calcium carbide furnace exhaust gas purification system that allows operators to monitor the pressure within the ash storage silo 1 in real time, enabling accurate nitrogen flow control and reducing the risk of explosion caused by air mixing with the calcium carbide furnace exhaust gas, thus ensuring the safety of operators and equipment.

[0029] Example 1:

[0030] Reference Figure 1 A calcium carbide furnace exhaust gas purification system includes: a dust removal component, an ash storage bin 1, a nitrogen conveying component, a pneumatic conveying component, and a pressure transmitter 3. The dust removal component is connected to the outlet of the calcium carbide furnace exhaust gas and is used to remove dust from the exhaust gas. The ash storage bin 1 is connected to the outlet of the dust removal component and is used to store the dust removed from the exhaust gas. The nitrogen conveying component is connected to both the dust removal component and the ash storage bin 1 via a connecting pipe 2 and is used to input nitrogen into the ash storage bin 1 through the connecting pipe 2. The pneumatic conveying component is connected to the outlet of the ash storage bin 1 and is used to convey the dust in the ash storage bin 1 to subsequent processing equipment. The pressure transmitter 3 is connected to the ash storage bin 1 and is used to monitor the pressure value inside the ash storage bin 1 in real time. Specifically, under normal conditions, the pressure range inside the ash storage bin 1 is 0–6 kPa.

[0031] Specifically, the outlet of the dust removal component is connected to the ash storage silo 1 through a discharge pipe, so as to introduce the dust after dust removal into the ash storage silo 1.

[0032] Specifically, the connecting pipe 2 includes a first branch pipe, a second branch pipe, and a manifold pipe. One end of the first branch pipe is connected to the dust removal component, and the other end is connected to the manifold pipe; one end of the second branch pipe is connected to the nitrogen conveying component, and the other end is connected to the manifold pipe; the manifold pipe is connected to the inlet end of the ash storage silo 1.

[0033] More specifically, valves are installed on the first branch pipe, the second branch pipe, and the manifold. During critical operations such as nitrogen replacement, pressure testing, and pressurization of the pneumatic conveying chamber pump, valves are installed to allow operators to adjust the flow of nitrogen input and calcium carbide furnace exhaust gas according to actual needs, ensuring the safety and stability of the system.

[0034] Reference Figure 1 A sampling pipe 4 is connected to the top side of the ash storage silo 1. The sampling pipe 4 is connected to the inner cavity of the ash storage silo 1, and the pressure transmitter 3 is installed on the sampling pipe 4 to ensure that the pressure transmitter 3 can accurately measure the pressure value inside the ash storage silo 1.

[0035] Reference Figure 1 The nitrogen delivery assembly includes a nitrogen delivery source and a nitrogen delivery pipeline 5. The nitrogen delivery source is connected to the nitrogen delivery pipeline 5 and is used to inject nitrogen into the nitrogen delivery pipeline 5; the outlet end of the nitrogen delivery pipeline 5 is connected to the connecting pipeline 2 so as to deliver nitrogen to the ash storage silo 1.

[0036] Specifically, a valve is installed on the nitrogen delivery pipeline 5 to control the amount of nitrogen input, ensuring that during the nitrogen replacement process, the amount of nitrogen input can be accurately adjusted according to the pressure value in the ash storage silo 1 and the nitrogen demand, avoiding problems caused by excessive or insufficient nitrogen.

[0037] Reference Figure 1 The dust removal assembly includes multiple dust collectors 6, the outlets of which are all connected to the inlet of the ash storage silo 1, and all of which are connected to the connecting pipe 2. The multiple dust collectors 6 work in parallel to improve dust removal efficiency.

[0038] Specifically, there are multiple first branch pipes, and these multiple first branch pipes are connected in parallel on the manifold. Each first branch pipe is connected to a dust collector 6.

[0039] Specifically, the dust collector 6 can be a bag filter or an electrostatic precipitator. By setting up the dust collector 6, the dust in the exhaust gas of the calcium carbide furnace can be removed, and either of these setup methods is acceptable; preferably, the dust collector 6 is a bag filter, as bag filters are easy to maintain and have high dust removal efficiency.

[0040] Reference Figure 1The pneumatic conveying assembly includes an ash discharge pipe 8 and a pneumatic conveying silo pump 9. The ash discharge pipe 8 is connected to the outlet end of the ash storage silo 1; the pneumatic conveying silo pump 9 is connected to the ash discharge pipe 8 and is used to transport the dust in the ash storage silo 1 to the subsequent processing equipment using airflow.

[0041] Example 2:

[0042] Reference Figure 1 In this embodiment of the calcium carbide furnace exhaust gas purification system, based on Embodiment 1, the calcium carbide furnace exhaust gas purification system further includes a controller and a display. The controller is connected to the pressure transmitter 3 and is used to receive the pressure value in the ash storage silo 1 detected in real time by the pressure transmitter 3; the display is connected to the controller and is used to display the real-time pressure value in the ash storage silo 1.

[0043] Specifically, the controller model is HollySys-MACS6.5.4.

[0044] In this embodiment, the controller and display are provided to facilitate remote real-time monitoring of the pressure value inside the ash storage silo 1 by the operators. This allows for accurate control of the nitrogen volume based on the pressure value inside the ash storage silo 1 during critical operations such as nitrogen replacement, pressure testing, and pressurization of the pneumatic conveying silo pump, thereby reducing the risk of explosion and ensuring the safety of the operators and equipment.

[0045] Example 3:

[0046] Reference Figure 1 In this embodiment of the calcium carbide furnace exhaust gas purification system, based on embodiment 2, the signal transmission method between the controller and the pressure transmitter 3 is either wired or wireless. Preferably, the signal transmission method between the controller and the pressure transmitter 3 is wireless to reduce wiring complexity.

[0047] Example 4:

[0048] Reference Figure 1 In this embodiment of the calcium carbide furnace exhaust gas purification system, based on embodiment 1, a maintenance ball valve is installed on the sampling tube 4.

[0049] In this embodiment, the maintenance ball valve allows the sampling tube 4 to be adjusted to a non-flowing state when needed, so that the pressure transmitter 3 can be repaired or replaced without interrupting the operation of the entire system.

[0050] Example 5:

[0051] Reference Figure 1 In this embodiment of the calcium carbide furnace exhaust gas purification system, based on embodiment 1, an explosion-proof valve 7 is installed on the ash storage silo 1.

[0052] In this embodiment, the explosion-proof valve 7 is designed to automatically open when the internal pressure of the ash storage silo 1 rises abnormally, releasing the pressure and preventing an explosion caused by excessive pressure, thereby further ensuring the safety of the system.

[0053] The working principle of the calcium carbide furnace exhaust gas purification system of this utility model is as follows: During the nitrogen replacement operation, the nitrogen delivery component sends nitrogen into the ash storage bin 1 through the connecting pipe 2. At the same time, the controller monitors the pressure value in the ash storage bin 1 in real time through the pressure transmitter 3, and adjusts the nitrogen input according to the pressure change to ensure that the nitrogen concentration in the ash storage bin 1 is within a safe range and to avoid mixing air with the calcium carbide furnace exhaust gas.

[0054] During the pressure test, other valves connected to the ash storage silo 1 are closed, and the ash storage silo 1 is pressurized through the nitrogen delivery assembly. The controller monitors the pressure value in the ash storage silo 1 in real time through the pressure transmitter 3 to determine whether there is a leak in the system and take corresponding measures according to the pressure changes.

[0055] When pressurizing the pneumatic conveying silo pump, start the pneumatic conveying silo pump 9 and use airflow to transport the dust in the ash storage silo 1 to the subsequent processing equipment. At the same time, the controller monitors the pressure change in the ash storage silo 1 through the pressure transmitter 3 to ensure that the pressure in the ash storage silo 1 is within a safe range during the pressurization process, and to prevent equipment damage or safety accidents caused by excessive pressure.

[0056] The preferred embodiments of this utility model are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A calcium carbide furnace tail gas purification system, comprising: a dust removal assembly in communication with an outlet end of the calcium carbide furnace tail gas for removing dust in the calcium carbide furnace tail gas; a dust storage bin (1) in communication with an outlet end of the dust removal assembly for storing the dust removed from the calcium carbide furnace tail gas; a nitrogen gas conveying assembly in communication with both the dust removal assembly and the dust storage bin (1) through a connecting pipeline (2) for inputting nitrogen gas into the dust storage bin (1) through the connecting pipeline (2); a pneumatic conveying assembly in communication with an outlet end of the dust storage bin (1) for conveying the dust in the dust storage bin (1) to subsequent processing equipment; and a pressure transmitter (3) connected with the dust storage bin (1) for detecting the pressure value in the dust storage bin (1) in real time.

2. The calcium carbide furnace tail gas purification system according to claim 1, characterized by: The calcium carbide furnace tail gas purification system further comprises a controller and a display; the controller is connected with the pressure transmitter (3) for receiving the pressure value in the dust storage bin (1) detected by the pressure transmitter (3) in real time; the display is connected with the controller for displaying the real-time pressure value in the dust storage bin (1).

3. The calcium carbide furnace tail gas purification system of claim 2, wherein: The model of the controller is HollySys-MACS6.5.

4.

4. The calcium carbide furnace tail gas purification system of claim 2, wherein: A sampling pipe (4) is connected to the side top of the dust storage bin (1), the sampling pipe (4) is in communication with the inner cavity of the dust storage bin (1), and the pressure transmitter (3) is installed on the sampling pipe (4).

5. The calcium carbide furnace tail gas purification system of claim 4, wherein: An overhaul ball valve is installed on the sampling pipe (4).

6. The calcium carbide furnace tail gas purification system of claim 2, wherein: The signal transmission mode between the controller and the pressure transmitter (3) is wired transmission or wireless transmission.

7. The calcium carbide furnace tail gas purification system of claim 1, wherein: The nitrogen gas conveying assembly comprises a nitrogen gas conveying source and a nitrogen gas conveying pipeline (5); the nitrogen gas conveying source is in communication with the nitrogen gas conveying pipeline (5) for injecting nitrogen gas into the nitrogen gas conveying pipeline (5); the outlet end of the nitrogen gas conveying pipeline (5) is in communication with the connecting pipeline (2).

8. The calcium carbide furnace tail gas purification system of claim 1, wherein: The dust removal assembly comprises a plurality of dust collectors (6), the outlet ends of the plurality of dust collectors (6) are in communication with the inlet end of the dust storage bin (1), and the plurality of dust collectors (6) are in communication with the connecting pipeline (2).

9. The calcium carbide furnace tail gas purification system of claim 1, wherein: The pneumatic conveying assembly comprises an ash discharge pipeline (8) and a pneumatic conveying bin pump (9); the ash discharge pipeline (8) is in communication with the outlet end of the dust storage bin (1); the pneumatic conveying bin pump (9) is in communication with the ash discharge pipeline (8) for conveying the dust in the dust storage bin (1) to the subsequent processing equipment by using air flow.

10. The calcium carbide furnace tail gas purification system of claim 1, wherein: An explosion-proof valve (7) is installed on the dust storage bin (1).

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