Device for automatically controlling calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature

Abstract

An embodiment of the utility model provides a device for automatically controlling calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature, which relates to the technical field of steam calcination of desulfurized gypsum and comprises a steam pipe type calcining kiln, a steam header is mounted at the front end of the steam pipe type calcining kiln, and a primary temperature and pressure reduction unit is arranged at the front end of the steam header. The primary temperature and pressure reduction unit comprises a main water pipe and a standby water pipe, a main pipeline of the main water pipe and the auxiliary water pipe is connected with an adjustable nozzle of the primary temperature and pressure reduction unit mounted on the main pipeline, the adjustable nozzle is mounted at the upper end of the main pipeline, and steam introduced into the main pipeline is subjected to temperature and pressure reduction through the primary temperature and pressure reduction unit; the steam is subjected to first-stage pressure reduction and temperature reduction, the steam pressure is stabilized, the steam superheat degree is reduced, the steam entering the steam pipe type calcining kiln is automatically adjusted through a second electric adjusting valve, and meanwhile interlocking control is conducted on the steam entering the steam pipe type calcining kiln and the calcining discharging temperature given by the technology.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurized gypsum steam calcination, in particular to a device for automatically controlling the desulfurized gypsum calcination temperature by utilizing saturated steam pressure temperature. Background Art

[0002] At present, in my country's desulfurized gypsum calcination production line, since desulfurized gypsum is a by-product of flue gas desulfurization in power plants, the plant construction conditions are generally close to power plants, and convenient conditions such as power plant steam can be used nearby. The steam system has stable heating and high quality, stable production line calcination process, and stable product quality. Steam calcination is a relatively ideal desulfurized gypsum calcination mode. However, due to the fact that some power plants supply steam from multiple points, some downstream steam-using enterprises have production fluctuations and inconsistent production systems, resulting in steam pressure fluctuations when the steam load is large, and when the downstream enterprises use steam loads at a low level, the main network steam pressure and flow rate increase. At the same time, in order to reduce the loss during transportation, the power plant steam is generally transported to the outside in the form of superheated steam. For the desulfurized gypsum calcination production line with determined production process parameters, due to the fluctuations in steam pressure, flow, temperature, superheat, etc. caused by the above reasons, other production process parameters need to be frequently adjusted in production control to match the calcination quality fluctuations caused by source steam fluctuations.

[0003] The quality of gypsum powder in the steam calcination production line is closely related to steam parameters, calcination temperature, crystallization water, etc. Simply manually controlling the steam valve or simply achieving a balance between steam heating and heat consumption by gypsum calcination through automatic control, and eliminating the heat supply imbalance caused by steam fluctuations, will result in large fluctuations in calcination temperature, inaccurate adjustment, and delayed adjustment, which will have a great impact on product quality and production stability. Utility Model Content

[0004] The purpose of the utility model is to provide a device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure temperature, which can avoid the problems of large fluctuations in calcination temperature, inaccurate adjustment and delayed adjustment by simply manually controlling the steam valve or simply achieving the balance between steam heating and heat consumption by gypsum calcination through automatic control.

[0005] The utility model provides a device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure temperature, comprising:

[0006] Steam tube calcining kiln, a steam cylinder is installed at the front end of the steam tube calcining kiln, a first-level temperature and pressure reduction unit is arranged at the front end of the steam cylinder, and a second-level automatic pressure regulator is arranged on the pipe in the middle of the steam cylinder and the steam tube calcining kiln;

[0007] The first-stage cooling and pressure reduction unit includes a main water pipe and a spare water pipe. The main water pipe and the spare water pipe are connected to an adjustable nozzle installed at one end of the main pipe. The adjustable nozzle is installed at the upper end of the main pipe.

[0008] Preferably, the upper ends of the main water pipe and the backup water pipe are arranged with a stop valve, a cooling water pump, a check valve and a throttle valve arranged at the end.

[0009] Preferably, a first electric regulating valve is installed at the front end of the main pipeline.

[0010] Preferably, a safety valve is arranged at the upper end of the sub-cylinder, and a control valve is also installed at the upper end of the sub-cylinder, one group of control valves is connected to the main pipeline, and the other group of control valves is connected to the steam tube calcining kiln.

[0011] Preferably, the secondary automatic pressure regulation includes a second electric regulating valve and manual regulating valves installed on both sides of the second electric regulating valve, and a vortex flowmeter is installed at the front end of the manual regulating valve.

[0012] Preferably, pressure transmitters and temperature transmitters are arranged at the upper end of the steam cylinder, the tail of the first-stage temperature and pressure reduction unit, the tail of the second-stage automatic pressure regulation, and the upper end of the front end of the main pipeline.

[0013] Preferably, the first-stage temperature and pressure reduction unit, the second-stage automatic pressure regulation, and the discharge signal of the steam tube calcining kiln are all connected to the control system through electrical signal connections.

[0014] The device provided by the embodiment of the utility model uses saturated steam pressure and temperature to automatically control the calcination temperature of desulfurized gypsum. The steam introduced into the main pipeline is cooled and depressurized by a first-level cooling and pressure reduction unit, and the steam is subjected to a first-level pressure reduction and temperature reduction, the steam pressure is stabilized, and the steam superheat is reduced. The steam entering the steam tube calcination kiln is automatically adjusted by a second electric regulating valve, and at the same time, it is interlocked with the calcination discharge temperature given by the process, thereby eliminating the problems of inaccurate process adjustment and adjustment lag caused by manual adjustment of the steam regulating valve opening in the existing production line, thereby affecting product quality. Through the first-level cooling and pressure reduction unit and the second-level automatic pressure regulation, the steam parameters at the source of the main pipeline are reduced to a suitable temperature and pressure to meet the user's requirements, improve heat exchange efficiency, and save heat energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall system of an embodiment of the utility model.

[0017] Figure 2 This is a schematic diagram of a first-stage temperature and pressure reduction unit system according to an embodiment of the present utility model.

[0018] Figure 3 It is a schematic diagram of a cylinder system according to an embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of a two-stage automatic voltage regulating system according to an embodiment of the utility model.

[0020] Figure 5 The utility model is a process flow chart of an embodiment of the present invention.

[0021] Icons: 1. Steam tube calcining kiln; 2. Steam cylinder; 21. Safety valve; 22. Control valve; 3. Primary temperature and pressure reduction unit; 31. Main water pipe; 32. Spare water pipe; 33. Adjustable nozzle; 34. First electric regulating valve; 4. Secondary automatic pressure regulation; 41. Second electric regulating valve; 42. Manual regulating valve; 43. Vortex flowmeter; 5. Control system; 6. Main pipeline; 7. Pressure transmitter; 8. Temperature transmitter. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0026] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] In order to better understand the purpose, structure and function of the utility model, the device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure temperature is further described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1-Figure 5 As shown, an embodiment of the utility model provides a device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure temperature, including a steam tube calcining kiln 1 for calcining desulfurized gypsum, a sub-cylinder 2 for distributing steam to each group of steam is installed at the front end of the steam tube calcining kiln 1, a first-level temperature reduction and pressure reduction unit 3 for reducing the temperature and pressure of the main pipeline 6 is arranged at the front end of the sub-cylinder 2, and a second-level automatic pressure regulator 4 is arranged on the sub-cylinder 2 and the middle pipeline of the steam tube calcining kiln 1.

[0029] The first-stage cooling and pressure reduction unit 3 includes a main water pipe 31 and a backup water pipe 32 for introducing cooling water. The main water pipe 31 and the backup water pipe 32 are connected to an adjustable nozzle 33 installed at one end. The adjustable nozzle 33 is installed at the upper end of the main pipeline 6.

[0030] The steam introduced into the main pipeline 6 is desuperheated and decompressed by the primary desuperheating and decompression unit 3, and the steam is decompressed and desuperheated to stabilize the steam pressure and reduce the steam superheat. The steam entering the steam tubular calcining kiln 1 is automatically adjusted through the second electric regulating valve 41 and the rear-end pressure transmitter 7 and the temperature transmitter 8, and is also interlocked with the calcining discharge temperature given by the process, thereby eliminating the problems of inaccurate process adjustment and delayed adjustment caused by manual adjustment of the steam regulating valve opening in the existing production line, thereby affecting product quality. The primary desuperheating and decompression unit 3 and the secondary automatic pressure regulation 4 are used to reduce the steam parameters at the source of the main pipeline 6 to a suitable temperature and pressure to meet the user's requirements, improve heat exchange efficiency, and save heat energy.

[0031] Through the first-level temperature and pressure reduction unit 3, the second-level automatic pressure regulation 4 and the second electric regulating valve 41, a two-level pressure stabilization process of the steam system is realized, so that the steam pressure and temperature required for calcination are stable, and the problems of low calcination quality control and heat exchange efficiency caused by steam pressure and flow fluctuations due to source gas load fluctuations and high steam superheat are eliminated.

[0032] In this system, the first-stage temperature reduction and pressure reduction unit 3, the second-stage automatic pressure regulation 4, the second electric regulating valve 41, the vortex flowmeter 43, the pressure transmitter 7 and the temperature transmitter 8 can all output analog standard signals, and are easy to be used with digital systems such as computers. Automatic control can be achieved through the control system 5. The system has a high degree of automation and high adjustment accuracy, which reduces errors and inconveniences caused by manual operation.

[0033] Among them, each component has a simple structure and is easy to maintain. The main components of the system are mature products in the chemical and electric power industries. They run smoothly and do not require any additional maintenance.

[0034] The upper ends of the main water pipe 31 and the backup water pipe 32 are arranged in sequence from the direction of the cooling water inlet with a stop valve for controlling the opening of the pipeline, a cooling water pump for controlling the cooling water flow rate, a check valve to prevent the cooling water from flowing back and causing damage to the equipment, and a throttle valve arranged at the end for adjusting the amount of water entering. By controlling the opening of the throttling stop valve, the cooling water entering the main water pipe 31 and the backup water pipe 32 can be adjusted, which is convenient for regulating the degree of steam temperature reduction. The main water pipe 31 and the backup water pipe 32 can be used alternately to avoid shutdown of the device for maintenance, which is convenient for maintenance.

[0035] A first electric regulating valve 34 for controlling the amount of steam introduced into the main pipeline 6 is installed at the front end thereof, so as to control the amount of steam entering the main pipeline 6 and ensure stable transmission of steam.

[0036] A safety valve 21 for protecting the sub-cylinder 2 is arranged at the upper end of the sub-cylinder 2. A control valve 22 for regulating the incoming steam and the outgoing steam of the sub-cylinder 2 is also installed at the upper end of the sub-cylinder 2. One group of control valves 22 is connected to the main pipeline 6, and the other group of control valves 22 is connected to the steam tube calcining kiln 1, which are used to distribute the steam in the main pipeline 6 and stabilize the steam pressure again.

[0037] The two-stage automatic pressure regulation 4 includes a second electric regulating valve 41 for regulating the amount of steam entering the steam tubular calcining kiln 1 and manual regulating valves 42 installed on both sides of the second electric regulating valve 41 for controlling the opening and closing of the pipeline. A vortex flowmeter 43 is installed at the front end of the manual regulating valve 42 for measuring the volume flow of steam inside the pipeline. It has high reliability, low maintenance, can output analog standard signals, and is easy to use with digital systems such as computers.

[0038] Pressure transmitters 7 and temperature transmitters 8 are arranged at the upper end of the steam cylinder 2, before and after the first-stage temperature and pressure reduction unit 3, at the tail of the second-stage automatic pressure regulation 4, and at the upper end of the front end of the main pipeline 6. They are set at various process points for real-time monitoring and feedback of various process data.

[0039] The first-stage temperature reduction and pressure reduction unit 3, the second-stage automatic pressure regulation 4, and the discharge temperature signal of the steam tube calcining kiln 1 are all connected with the control system 5 by electrical signal, which is used to control and analyze the process conditions of each group, so as to facilitate real-time monitoring and adjustment of each group of processes. The control system 5 receives the real-time calcination discharge temperature, compares it with the process parameters given by the system, and after information processing, directs the automatic adjustment of steam through the second-stage automatic pressure regulation 4PID electric control valve, controls the steam flow and pressure entering the kiln, automatically establishes a balance between calcination heat supply and heat consumption, and realizes automatic adjustment.

[0040] The working principle of the device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature is as follows: the steam introduced into the main pipeline 6 is desuperheated and decompressed by the first-level desuperheating and decompression unit 3, the steam is decompressed and desuperheated in the first level, the steam pressure is stabilized, the steam superheat is reduced, and the steam entering the steam tube calcination kiln 1 is automatically adjusted by the second electric regulating valve 41 and the rear-end pressure transmitter 7 and temperature transmitter 8, and at the same time, it is interlocked with the calcination discharge temperature given by the process, eliminating the problems of inaccurate process adjustment and delayed adjustment caused by manual adjustment of the steam regulating valve opening in the existing production line, thereby affecting product quality. Through the first-level desuperheating and decompression unit 3 and the second-level automatic pressure regulation 4, the steam parameters at the source of the main pipeline 6 are reduced to appropriate temperature and pressure to meet the user's requirements, improve heat exchange efficiency, and save heat energy.

[0041] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature, characterized in that: include: A steam tube calcining kiln (1), wherein a steam cylinder (2) is installed at the front end of the steam tube calcining kiln (1), a first-stage temperature reduction and pressure reduction unit (3) is arranged at the front end of the steam cylinder (2), and a second-stage automatic pressure regulator (4) is arranged on the pipeline in the middle of the steam cylinder (2) and the steam tube calcining kiln (1); A primary temperature reduction and pressure reduction unit (3), the primary temperature reduction and pressure reduction unit (3) comprising a main water pipe (31) and a spare water pipe (32), the main water pipe (31) and the spare water pipe (32) being connected to an adjustable nozzle (33) of the primary temperature reduction and pressure reduction unit (3) installed at one end, the adjustable nozzle (33) being installed at the upper end of the main pipe (6).

2. The device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure temperature according to claim 1, characterized in that: The upper ends of the main water pipe (31) and the standby water pipe (32) are provided with a stop valve, a temperature-reducing water pump, a check valve and a throttle valve arranged at the end.

3. The device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature according to claim 2, characterized in that: A first electric regulating valve (34) is installed at the front end of the main pipeline (6).

4. The device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure temperature according to claim 3, characterized in that: A safety valve (21) is arranged at the upper end of the steam sub-cylinder (2). A control valve (22) is also installed at the upper end of the steam sub-cylinder (2). One set of control valves (22) is connected to the main pipeline (6), and another set of control valves (22) is connected to the steam tube calcining kiln (1).

5. The device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature according to claim 4, characterized in that: The secondary automatic pressure regulator (4) comprises a second electric regulating valve (41) and manual regulating valves (42) installed on both sides of the second electric regulating valve (41), and a vortex flowmeter (43) is installed at the front end of the manual regulating valve (42).

6. The device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature according to claim 5, characterized in that: A pressure transmitter (7) and a temperature transmitter (8) are arranged at the upper end of the steam cylinder (2), before and after the first temperature and pressure reduction unit (3), at the tail end of the second automatic pressure regulator (4), and at the upper end of the front end of the main pipeline (6).

7. The device for automatically controlling the calcination temperature of desulfurized gypsum by using saturated steam pressure and temperature according to claim 6, characterized in that: The first-stage temperature and pressure reduction unit (3), the second-stage automatic pressure regulation (4), the discharge temperature signal of the steam tube calcining kiln (1), the pressure transmitter (7) and the temperature transmitter (8) signals are all connected to the control system (5) by electrical signal connection.

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