Circulation pressure control device of WSA condenser

Abstract

The utility model discloses a circulation pressure control device of a WSA condenser. The circulation pressure control device is composed of an air inlet, a condenser, a sulfuric acid storage tank, an air cooler, an air heater, a first acid-resistant electric gate plate adjusting valve, a second acid-resistant electric gate plate adjusting valve and a tail gas chimney. A gas inlet is formed in the lower portion of the condenser, a first condensation pipe and a second condensation pipe are arranged in the condenser, the first condensation pipe is connected with a tail gas chimney through a first acid-resistant electric gate plate adjusting valve, and the second condensation pipe is connected with the tail gas chimney through a second acid-resistant electric gate plate adjusting valve. The lower end of the condenser is connected with a sulfuric acid storage tank through a pipeline; an air cooling channel is arranged between the condenser and the condensation pipe, an air cooler is arranged at an air inlet of the air cooling channel, and an air heater is arranged at an air outlet of the air cooling channel. According to the device, the acid-resistant electric flashboard regulating valves additionally arranged at the top outlets of the two groups of glass tube condensers are used for balancing and controlling the pressure of acid gas flowing through the two groups of glass tube condensers, and the two groups of glass tube condensers of the WSA condenser are fully utilized, so that sulfuric acid gas is condensed to form a sulfuric acid product, and acid mist in tail gas is reduced to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the field of wet acid production technology, in particular to a WSA condenser circulation pressure control device. Background Art

[0002] The wet gas sulfuric acid (WSA) process, developed by Haldor Topsoe in Denmark in the mid-1980s, primarily converts various sulfides in acid gas into concentrated sulfuric acid. This process is particularly suitable for treating acid gas with low sulfur content that cannot be treated by conventional acid production processes. The WSA condenser is a falling-film shell-and-tube glass tube condenser, whose heat exchange tubes are primarily made of glass and divided into two groups. It is a key component of the sulfuric acid plant. Process gas containing H2SO4 is cooled to 290°C in the process gas cooler and then transported to the two groups of glass tubes in the WSA condenser E10105, where it condenses into liquid sulfuric acid. The sulfuric acid-containing process gas flows upward through the glass tubes, while the condensed liquid sulfuric acid flows downward along the inner walls of the tubes. The liquid sulfuric acid is finally collected in a sulfuric acid collection tank with a bottom line made of acid-resistant bricks. The sulfuric acid collected in the tank has a concentration of 98% by weight and a temperature of approximately 255°C.

[0003] After condensation and deacidification, the process gas is cooled to 105°C, forming clean gas with an acid mist content of ≤3.57mg / m3 (standard conditions), which meets emission standards.

[0004] Existing problems: Since the two sets of glass tube condensers of the WSA condenser are located at the acid gas inlet and end respectively, there is a difference in the flow resistance of the acid gas through the two sets of glass tube condensers. The flow resistance of the glass tube condenser at the acid gas inlet is relatively large. Therefore, most of the acid gas flows to the glass tube condenser at the end, resulting in an unbalanced acid gas load on the two sets of condensers. The acid gas load of the glass tube heat exchanger at the inlet end is low, and the condenser is not fully utilized; while the acid gas load of the glass tube condenser at the end is too high, and the acid gas cannot be fully condensed, resulting in excessive acid mist in the exhaust gas, increased exhaust gas shading, and excessive exhaust gas emissions.

[0005] Furthermore, glass tubes are fragile and require gradual replacement as the unit's operating time increases. Due to variations in the type and batch of glass tubes replaced, as well as the weight of the defoaming screens on top of the tubes, the flow resistance between the two sets of glass tubes can vary, leading to uneven distribution of the acid gas load and excessive tail gas emissions.

[0006] Therefore, a stable and efficient WSA condenser circulation pressure automatic control system is designed to balance the acid gas load of the two sets of glass tube condensers, make full use of the two sets of glass tube condensers, improve the shading degree of the tail gas of the sulfuric acid unit, optimize the condenser acid mist control, reduce the loss of sulfuric acid product, and produce better economic and environmental benefits, which has good practical value. Summary of the Invention

[0007] In order to solve the above problems, the utility model provides a WSA condenser circulation pressure control device, which consists of an air inlet, a condenser, a sulfuric acid storage tank, an air cooler, a hot air blower, a first acid-resistant electric gate regulating valve, a second acid-resistant electric gate regulating valve and an exhaust gas chimney; the lower part of the condenser is provided with an air inlet, and the condenser is provided with a first condenser tube and a second condenser tube, the first condenser tube is connected to the exhaust gas chimney through the first acid-resistant electric gate regulating valve, and the second condenser tube is connected to the exhaust gas chimney through the second acid-resistant electric gate regulating valve; the lower end of the condenser is connected to the sulfuric acid storage tank through a pipeline; an air cooling channel is provided inside the condenser and between the condenser tube, the air inlet of the air cooling channel is provided with an air cooler, and the air outlet of the air cooling channel is provided with a hot air blower.

[0008] Furthermore, a first pressure gauge is provided between the first condenser pipe and the first acid-resistant electric gate regulating valve, and a second pressure gauge is provided between the second condenser pipe and the second acid-resistant electric gate regulating valve. The pressure gauges can be connected to a PLC, and the acid-resistant electric gate regulating valve is controlled by the PLC.

[0009] Furthermore, an acid mist controller is provided behind the air inlet to control the incoming acid mist.

[0010] Furthermore, an exhaust gas shading online analyzer is installed in front of the exhaust chimney to analyze the exhaust gas.

[0011] This utility model uses newly added acid-resistant electric gate regulating valves at the top outlets of two sets of glass tube condensers to balance and control the pressure of the acid gas flowing through the two sets of glass tube condensers. This fully utilizes the two sets of glass tube condensers of the WSA condenser to condense the sulfuric acid gas to form sulfuric acid product, thereby minimizing the acid mist in the tail gas. The pressure balance of the two sets of glass tube condensers is adjusted and controlled to achieve automatic pressure control. This utility model is characterized by ease of use, stable control, and strong practicality. It can significantly reduce sulfuric acid losses and has great practical and economic value for tail gas emission control and environmental protection, safety, and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the WSA condenser flow pressure control device.

[0013] Reference numerals:

[0014] 1: Air inlet; 2: Acid mist controller; 3: Condenser; 4: Sulfuric acid storage tank; 5: Exhaust gas chimney; 6: Air cooler; 7: Air heater; 8: First acid-resistant electric gate regulating valve; 9: Second acid-resistant electric gate regulating valve; 10: First pressure gauge; 11: Second pressure gauge; 12: Exhaust gas shading online analyzer. DETAILED DESCRIPTION

[0015] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0016] like Figure 1 As shown, a WSA condenser circulation pressure control device is provided, which consists of an air inlet 1, a condenser 3, a sulfuric acid storage tank 4, an air cooler 6, a hot air blower 7, a first acid-resistant electric gate regulating valve 8, a second acid-resistant electric gate regulating valve 9 and an exhaust chimney 5; the lower part of the condenser is provided with an air inlet 1, and the condenser is provided with a first condenser tube and a second condenser tube, the first condenser tube is connected to the exhaust chimney 5 through the first acid-resistant electric gate regulating valve 8, and the second condenser tube is connected to the exhaust chimney 5 through the second acid-resistant electric gate regulating valve 9; the lower end of the condenser is connected to the sulfuric acid storage tank 4 through a pipeline; an air cooling channel is provided between the condenser and the condenser tube, the air inlet of the air cooling channel is provided with an air cooler 6, and the air outlet of the air cooling channel is provided with a hot air blower 7.

[0017] A first pressure gauge 10 is provided between the first condenser pipe and the first acid-resistant electric gate regulating valve, and a second pressure gauge 11 is provided between the second condenser pipe and the second acid-resistant electric gate regulating valve. The pressure gauge can be connected to a PLC, and the acid-resistant electric gate regulating valve is controlled by the PLC.

[0018] An acid mist controller 2 is provided after the air inlet to control the incoming acid mist.

[0019] An exhaust gas shading online analyzer 12 is provided in front of the exhaust chimney to analyze the exhaust gas.

[0020] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A WSA condenser flow pressure control device, characterized in that: It consists of an air inlet, a condenser, a sulfuric acid storage tank, an air cooler, a hot air blower, a first acid-resistant electric gate regulating valve, a second acid-resistant electric gate regulating valve and an exhaust gas chimney; the lower part of the condenser is provided with an air inlet, and the condenser is provided with a first condensing tube and a second condensing tube, the first condensing tube is connected to the exhaust gas chimney through the first acid-resistant electric gate regulating valve, and the second condensing tube is connected to the exhaust gas chimney through the second acid-resistant electric gate regulating valve; the lower end of the condenser is connected to the sulfuric acid storage tank through a pipeline; an air-cooling channel is provided inside the condenser and between the condensing tubes, the air inlet of the air-cooling channel is provided with an air cooler, and the air outlet of the air-cooling channel is provided with a hot air blower.

2. The WSA condenser flow pressure control device according to claim 1, characterized in that: A first pressure measuring device is provided between the first condenser and the first acid-resistant electric gate regulating valve, and a second pressure measuring device is provided between the second condenser and the second acid-resistant electric gate regulating valve.

3. The WSA condenser flow pressure control device according to claim 1, characterized in that: An acid mist controller is arranged behind the air inlet.

4. The WSA condenser flow pressure control device according to claim 1, characterized in that: An online analyzer for tail gas shading is provided in front of the tail gas chimney.

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