Safe and energy-saving combined system for drying system

Abstract

The utility model discloses a safe and energy-saving combined system for a drying system, which comprises a drying machine device for drying solid materials, and the drying machine device adopts steam as a heat source and is connected with a steam pipeline from a low-temperature steam generator. A redundant steam and condensed water outlet of the drying machine device is connected with the low-temperature steam generator through a condensed water control valve; an emptying valve branch is arranged on a pipeline between the condensed water control valve and the drying machine device; a low-pressure steam valve is arranged on the steam pipeline from the low-temperature steam generator; the bottom of the low-temperature steam generator is provided with a condensed water discharge outlet, and the upper portion of the low-temperature steam generator is connected with a safety valve passage which is provided with a safety valve and communicated with the pressure relief groove. According to the utility model, the problem that a drain valve needs to be configured when steam is used as a heating source is solved, so that the problems that the drain valve leaks steam, condensed water is unsmooth to discharge, and the heat of the condensed water cannot be fully recycled are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of safe energy-saving combination system for drying system. BACKGROUND

[0002] Solid material is usually heated by hot water or steam. When steam is used as heat source, trap is needed, which may cause steam leakage, poor condensate discharge and insufficient recovery of condensate heat, resulting in energy waste. Moreover, when system pressure exceeds 0.1 MPa, the equipment must be a pressure vessel, which may cause safety hazard. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned defects, and provides a kind of safe energy-saving combination system for drying system, which solves the problems of steam leakage, poor condensate discharge and insufficient recovery of condensate heat.

[0004] The technical solution of the utility model is as follows:

[0005] A kind of safe energy-saving combination system for drying system, characterized by: including the drying machine device for carrying out solid material drying, drying machine device uses steam as heat source, and is connected with steam pipeline from low-temperature steam generator, the excess steam of drying machine device and condensate outlet are connected with low-temperature steam generator through condensate control valve, and vent valve branch is arranged on the pipeline between condensate control valve and drying machine device;Low-pressure steam valve is arranged on the steam pipeline from low-temperature steam generator;Low-temperature steam generator bottom is equipped with condensate discharge port, and low-temperature steam generator upper portion is connected with safety valve passage, safety valve passage is equipped with safety valve, and is communicated with pressure relief groove.

[0006] The drying machine is a vacuum dryer.

[0007] The vacuum dryer is a rake dryer or double-cone rotary dryer.

[0008] The built-in liquid seal of the pressure relief groove meets the water capacity of 10 meters water column.

[0009] The utility model solves the problem of needing trap when steam is used as heat source, thereby solving the problems of steam leakage, poor condensate discharge and insufficient recovery of condensate heat. By using steam residual pressure as conveying power, condensate is sent to recovery system for comprehensive utilization, so that heat is fully utilized, energy is saved, and economic benefit is remarkable. System pressure is less than 0.1 MPa, and the equipment does not need to use pressure vessel, which is safe. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model is further described below in combination with the drawings and examples.

[0011] Figure 1 It is the structure schematic diagram of one embodiment of the utility model. DETAILED DESCRIPTION

[0012] A kind of safe energy-saving combined system for drying system, including the drying machine device 1 for carrying out solid material drying, drying machine device uses steam as heat source, with the steam pipeline 2 from low temperature steam generator is connected, the excess steam of drying machine device and condensate outlet is connected with low temperature steam generator 4 by condensate control valve 3, vent valve branch 5 is arranged on the pipeline between condensate control valve and drying machine device;The steam pipeline from low temperature steam generator is equipped with low pressure steam valve 6;Low temperature steam generator bottom is equipped with condensate discharge port, and condensate discharge port connects drain valve 7;Low temperature steam generator upper portion is connected with safety valve passage, safety valve passage is equipped with safety valve 8, and is communicated with pressure relief groove 9.

[0013] The drying machine is a vacuum dryer.The vacuum dryer is a rake dryer or a double-cone rotary dryer.

[0014] The built-in liquid seal of the pressure relief groove satisfies the water capacity of 10 meters of water column, for balancing system pressure, pressure relief safety valve 8~10 meters of water seal pressure head, ensure system safe operation.

[0015] The working steps and principles of the embodiment are as follows:

[0016] The low temperature steam pressure is controlled to be 0.05 MPa, and the temperature is 112±2℃ (preferably, the pressure and temperature of the low temperature steam generator are set to be interlocked with the high temperature steam regulating valve).

[0017] The solid wet material is put into the drying machine, the feeding port is closed, the vacuum valve is opened, and the drying machine is controlled at-0.09 MPa (gauge pressure) under vacuum.

[0018] The low temperature steam valve of the drying machine is opened, and drying operation is carried out.Excess steam and condensate in the drying process enter the low temperature steam generator for water vapor separation, steam is recycled into the drying machine as a heating heat source, and condensate is sent to the recycling system for comprehensive utilization by using the steam residual pressure as the conveying power.

[0019] The low temperature steam generator is provided with a safety valve and connected with a pressure relief groove to ensure safety.

[0020] After drying is completed, the low pressure steam valve and the vacuum valve are closed, and the vent valve is opened.The drying machine is unloaded by opening the unloading valve.

[0021] The embodiment can better recycle steam and condensate on the basis of effectively drying solid materials, save energy, and set interlocking devices of pressure, temperature and steam regulating valve, and set safety valve and pressure relief groove, reduce safety hazards and improve safety and reliability of the system.

Claims

1. A safe and energy-saving combined system for a drying system, characterized in that: The device includes a dryer for drying solid materials. The dryer uses steam as a heat source and is connected to a steam pipeline from a low-temperature steam generator. The excess steam and condensate outlet of the dryer are connected to the low-temperature steam generator through a condensate control valve. A vent valve branch is installed on the pipeline between the condensate control valve and the dryer. A low-pressure steam valve is installed on the steam pipeline from the low-temperature steam generator. A condensate discharge port is provided at the bottom of the low-temperature steam generator. A safety valve passage is connected to the upper part of the low-temperature steam generator. A safety valve is installed on the safety valve passage and is connected to a pressure relief tank.

2. The safe and energy-saving combined system for drying systems according to claim 1, characterized in that: The dryer is a vacuum dryer.

3. The safe and energy-saving combined system for drying systems according to claim 2, characterized in that: The vacuum dryer is either a rake dryer or a double cone rotary dryer.

4. The safe and energy-saving combined system for drying systems according to claim 2, characterized in that: The built-in liquid seal of the pressure relief tank can accommodate a water volume of 10 meters of water column.

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